Internal Use Only
North/Latin America
Europe/Africa
Asia/Oceania
LED LCD TV
SERVICE MANUAL
CHASSIS : LD21A
MODEL : 19LS3500/350S/350T
MODEL : 19LS3500/350S/350T-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67360701 (1202-REV00)
Printed in Korea
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SAFETY PRECAUTIONS
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by
Schematic Diagram and Exploded View.
in the
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent
Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
General Guidance
An isolation Transformer should always be used during the
servicing of a receiver whose chassis is not isolated from the AC
power line. Use a transformer of adequate power rating as this
protects the technician from accidents resulting in personal injury
from electrical shocks.
Do not use a line Isolation Transformer during this check.
Connect 1.5 K / 10 watt resistor in parallel with a 0.15 uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC voltmeter
with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Any voltage
measured must not exceed 0.75 volt RMS which is corresponds to
0.5 mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film Resistor,
over 1 W), keep the resistor 10 mm away from PCB.
Leakage Current Hot Check circuit
Keep wires away from high voltage or high temperature parts.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc., to
be sure the set is safe to operate without damage of electrical
shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source, connect an
electrical jumper across the two AC plug prongs. Place the AC
switch in the on position, connect one lead of ohm-meter to the AC
plug prongs tied together and touch other ohm-meter lead in turn to
each exposed metallic parts such as antenna terminals, phone
jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1 MΩ and 5.2 MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
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SERVICING PRECAUTIONS
CAUTION: Before servicing receivers covered by this service
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or expo-
sure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ES
devices.
4. Use only an anti-static type solder removal device. Some solder
removal devices not classified as “anti-static” can generate
electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads electri-
cally shorted together by conductive foam, aluminum foil or
comparable conductive material).
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety precautions
on page 3 of this publication, always follow the safety precautions.
Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC power
source before;
a. Removing or reinstalling any component, circuit board mod-
ule or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug or
other electrical connection.
c. Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect polarity
installation of electrolytic capacitors may result in an explo-
sion hazard.
7. Immediately before removing the protective material from the
leads of a replacement ES device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Do not spray chemicals on or near this receiver or any of its
assemblies.
4. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to the
contacts with a pipe cleaner, cotton-tipped stick or comparable
non-abrasive applicator; 10 % (by volume) Acetone and 90 %
(by volume) isopropyl alcohol (90 % - 99 % strength)
CAUTION: This is a flammable mixture.
CAUTION: Be sure no power is applied to the chassis or circuit,
and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged replace-
ment ES devices. (Otherwise harmless motion such as the
brushing together of your clothes fabric or the lifting of your
foot from a carpeted floor can generate static electricity suf-
ficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and appropriate
tip size and shape that will maintain tip temperature within the
range or 500 °F to 600 °F.
Unless specified otherwise in this service manual, lubrication of
contacts in not required.
2. Use an appropriate gauge of RMA resin-core solder composed
of 60 parts tin/40 parts lead.
5. Do not defeat any plug/socket B+ voltage interlocks with which
receivers covered by this service manual might be equipped.
6. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks are
correctly installed.
7. Always connect the test receiver ground lead to the receiver
chassis ground before connecting the test receiver positive
lead.
Always remove the test receiver ground lead last.
8. Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to any
heat sink in this receiver.
3. Keep the soldering iron tip clean and well tinned.
4. Thoroughly clean the surfaces to be soldered. Use a mall wire-
bristle (0.5 inch, or 1.25 cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500 °F to 600 °F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static, suction-
type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal temperature
(500 °F to 600 °F)
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid-state) devices can be damaged eas-
ily by static electricity. Such components commonly are called
Electrostatically Sensitive (ES) Devices. Examples of typical ES
devices are integrated circuits and some field-effect transistors
and semiconductor “chip” components. The following techniques
should be used to help reduce the incidence of component dam-
age caused by static by static electricity.
1. Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground. Alter-
natively, obtain and wear a commercially available discharging
wrist strap device, which should be removed to prevent poten-
tial shock reasons prior to applying power to the unit under test.
b. First, hold the soldering iron tip and solder the strand against
the component lead until the solder melts.
c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it there
only until the solder flows onto and around both the compo-
nent lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess or
splashed solder with a small wire-bristle brush.
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IC Remove/Replacement
3. Solder the connections.
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the cir-
cuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing
the IC.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC connec-
tions).
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close
as possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the
good copper pattern. Solder the overlapped area and clip off
any excess jumper wire.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
Power Output, Transistor Device
Removal/Replacement
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly con-
nected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
Carefully crimp and solder the connections.
1. Remove defective diode by clipping its leads as close as pos-
sible to diode body.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
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SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement
.
1. Application range
This specification is applied to the LCD TV used LD21A
chassis.
3. Test method
1) Performance: LGE TV test method followed
2) Demanded other specification
- Safety : CE, IEC specification
- EMC : CE, IEC
2. Requirement for Test
Each part is tested as below without special appointment.
1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C
2) Relative Humidity: 65 % ± 10 %
3) Power Voltage
: Standard input voltage (AC 100-240 V~, 50/60 Hz)
* Standard Voltage of each products is marked by models.
4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
4. Model General Specification
No.
Item
Specification
Remarks
1
Market
EU(PAL Market-37Countries)
DTV & Analog (Total 37 countries)
DTV (MPEG2/4, DVB-T) :37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Nether-
lands/ Belgium/Luxemburg/ Greece/Denmark/Czech/
Austria /Hungary/Swiss/Croatia/Turkey
Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/
Latvia/Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia
Bosnia/Serbia/Albania/Kazakhstan/Belarus
DTV (MPEG2/4, DVB-T2): 8 countries
UK/Denmark/Sweden/Finland/Norway/Ireland/Ukraine/
Kazakhstan
DTV (MPEG2/4, DVB-C): 37 countries
UK/Italy/Germany/France/Spain/Sweden/Finland/Nether-
lands/ Belgium/Luxemburg/ Greece/Denmark/Czech/
Austria /Hungary/Swiss/Croatia/Turkey
Norway/Slovenia/Poland/Ukraine/Portugal/Ireland/Morocco/
Latvia/Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia
Bosnia/Serbia/Albania/Kazakhstan/Belarus
DTV (MPEG2/4,DVB-S): 29 countries
Italy/Germany/France/Spain/Netherlands/ Belgium/
Luxemburg/ Greece/ Czech/Austria /Hungary/Swiss/
Croatia/
Turkey/Slovenia/Poland/Portugal/ Morocco/Latvia/
Estonia/Lithania/Rumania/Bulgaria/Russia/Slovakia
Bosnia/Serbia/Albania/ Belarus
Supported satellite : 22 satellites
HISPASAT 1C/1D, ATLANTIC BIRD 2, NILESAT 101/102,
ATLANTIC BIRD 3, AMOS 2/3, THOR 5/6, IRIUS 4,
EUTELSAT-W3A, EUROBIRD 9A, EUTELSAT-W2A,
HOTBIRD 6/8/9, EUTELSAT-SESAT, ASTRA 1L/H/M/
KR, ASTRA 3A/3B, BADR 4/6, ASTRA 2D, EUROBIRD 3,
EUTELSAT-W7, HELLASSAT 2, EXPRESS AM1, TURK-
SAT 2A/3A, INTERSAT10
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No.
2
Item
Specification
Remarks
1) PAL-BG
2) PAL-DK
3) PAL-I/I’
Broadcasting system
4) SECAM L/L’
5) DVB-T/T2/C/S
► DVB-T
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32
- Modulation : Code Rate
QPSK : 1/2, 2/3, 3/4, 5/6, 7/8
16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8
► DVB-T2
- Guard Interval(Bitrate_Mbit/s)
1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256,
- Modulation : Code Rate
QPSK : 1/2, 2/5, 2/3, 3/4, 5/6
16-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
64-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
256-QAM : 1/2, 2/5, 2/3, 3/4, 5/6
Analog : Upper Heterodyne
Digital : COFDM, QAM
3
Receiving system
► DVB-C
- Symbolrate : 4.0Msymbols/s to 7.2Msymbols/s
- Modulation : 16QAM, 64-QAM, 128-QAM and 256-QAM
► DVB-S/S2
- symbolrate
DVB-S2 (8PSK / QPSK) : 2 ~ 45Msymbol/s
DVB-S (QPSK) : 2 ~ 45Msymbol/s
- viterbi
DVB-S mode : 1/2, 2/3, 3/4, 5/6, 7/8
DVB-S2 mode : 1/2, 2/3, 3/4, 3/5, 4/5, 5/6, 8/9, 9/10
4
5
Scart Jack (1EA)
PAL, SECAM
Scart 1 Jack is Full scart and support RF-OUT(analog).
4 System : PAL, SECAM, NTSC, PAL60
Video Input RCA(1EA)
PAL, SECAM, NTSC
Y/Cb/Cr
Y/Pb/Pr
6
7
Component Input (1EA)
RGB Input
Analog(D-SUB 15PIN)
Some models (LD21A,LD21C) are not supported.
RGB-PC
HDMI1-DTV/DVI
HDMI2-DTV
HDMI3-DTV
PC(HDMI version 1.3)
Support HDCP
The number of Input ports is different by model.
8
9
HDMI Input (3EA)
Audio Input (2EA)
In case of the RGB/DVI Audio input,
Some models(LD21A,LD21C) are not supported.
Component & AV’s audio input is used by common port.
RGB/DVI Audio
Component & AV
10 SDPIF out (1EA)
SPDIF out
Some models(LD21A,LD21C) are not supported.
Antenna, AV1, AV2, Component, RGB,
HDMI1, HDMI2, HDMI3
11 Earphone out (1EA)
Some models(LD21A,LD21C) are not supported.
EMF,
JPEG, MP3, DivX HD
12 USB (1EA or 2EA)
DivX HD,
LM58, CM96: 2EA
For SVC (download)
LS56, LS35, CS46, LS,34, LM34 : 1EA
CI : UK, Finland, Denmark, Norway, Sweden, Russia,
Spain, Ireland, Luxemburg, Belgium, Netherland
CI+ : France(Canal+), Italy(DGTVi)
DVB-T
DVB-C
13 DVB
CI : Switzerland, Austria, Slovenia, Hungary, Bulgaria
CI+ : Switzerland(UPC,Cablecom), Netherland(Ziggo),
Germany(KDG,CWB), Finland(labwise)
DVB-S
CI + : Germany(Astra HD+ )
14 Ethernet (1EA)
DLNA(Wired, DMP only)
Some models (LD21A,LD21C) are not supported.
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5. Video resolutions (2D)
5.1. Component Input (Y, CB/PB, CR/PR)
No.
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel clock(MHz)
13.5
Proposed
SDTV ,DVD 576I
1
720*576
15.625
50.00
2
720*480
15.73
15.73
31.25
31.50
31.47
37.50
45.00
44.96
28.125
33.75
33.72
56.25
67.50
67.432
27.00
26.97
33.75
33.71
60.00
59.94
50.00
60.00
59.94
50.00
60.00
59.94
50.00
60.00
59.94
50.00
60.00
59.94
24.00
23.94
30.00
29.97
13.5135
13.50
SDTV ,DVD 480I
SDTV ,DVD 480I
SDTV 576P
3
720*480
4
720*576
27.00
5
720*480
27.027
27.00
SDTV 480P
6
720*480
SDTV 480P
7
1280*720
1280*720
1280*720
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
74.25
HDTV 720P
HDTV 720P
HDTV 720P
HDTV 1080I
HDTV 1080I
HDTV 1080I
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
8
74.25
9
74.176
74.25
10
11
12
13
14
15
16
17
18
19
74.25
74.176
148.50
148.50
148.352
74.25
74.176
74.25
74.176
5.2. RGB Input (PC) – LS35/LS34/CS46 series models are not supported.
No.
1
Resolution
640*350
H-freq(kHz)
31.468
V-freq.(Hz)
70.09
Pixel clock(MHz)
25.17
Proposed
DDC
X
EGA
DOS
2
720*400
31.469
31.469
37.879
48.363
54.348
47.712
67.5
70.08
59.94
60.31
60.00
60.053
60.015
60
28.32
25.17
40.00
65.00
80.00
85.50
148.5
O
3
640*480
VESA(VGA)
VESA(SVGA)
VESA(XGA)
VESA
O
4
800*600
O
5
1024*768
1152*864
1360*768
1920*1080
O
6
O
7
VESA (WXGA)
HDTV 1080P
O
8
O
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5.3. HDMI Input(PC/DTV)
No.
Resolution
H-freq(kHz)
V-freq.(Hz)
Pixel clock(MHz)
Proposed
DDC
Remark
PC(DVI)
1
2
640*350
720*400
31.468
31.469
31.469
37.879
48.363
54.348
47.712
63.981
67.50
70.09
70.08
59.94
60.31
60.00
60.053
60.015
60.020
60.00
25.17
28.32
25.17
40.00
65.00
80.00
85.50
108.0
148.5
EGA
X
O
O
O
O
O
O
O
O
DOS
3
640*480
VESA(VGA)
VESA(SVGA)
VESA(XGA)
VESA
4
800*600
5
1024*768
1152*864
1360*768
1280*1024
1920*1080
6
7
VESA (WXGA)
VESA (SXGA)
HDTV 1080P
8
FHD only
FHD only
9
DTV
1
720*480
720*480
31.47
31.50
31.250
37.50
45.00
44.96
28.125
33.75
33.72
56.250
67.50
67.432
27.00
26.97
33.75
59.94
60.00
50.00
50.00
60.00
59.94
50.00
60.00
59.94
50.00
60.00
59.94
24.00
23.976
30.00
27.00
27.027
27.00
SDTV 480P
SDTV 480P
SDTV 576P
HDTV 720P
HDTV 720P
HDTV 720P
HDTV 1080I
HDTV 1080I
HDTV 1080I
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
HDTV 1080P
2
3
720*576
4
1280*720
1280*720
1280*720
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
1920*1080
74.25
5
74.25
6
74.176
74.25
7
8
74.25
9
74.176
148.50
148.50
148.352
74.25
10
11
12
13
14
15
74.176
74.25
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ADJUSTMENT INSTRUCTION
(4) Click "Connect" tab. If "Can't" is displayed, check connection
between computer, jig, and set.
1. Application Range
This specification sheet is applied to all of the LCD TV with
LD21A chassis.
(2)
(3)
2. Designation
(1) The adjustment is according to the order which is designated
and which must be followed, according to the plan which
can be changed only on agreeing.
(2) Power adjustment : Free Voltage.
(3) Magnetic Field Condition: Nil.
(4) Input signal Unit: Product Specification Standard.
(5) Reserve after operation : Above 5 Minutes (Heat Run)
Temperature : at 25 °C ± 5 °C
Please Check the Speed :
To use speed between
from 200KHz to 400KHz
Relative humidity : 65 ± 10 %
Input voltage : 220 V, 60 Hz
(5) Click "Auto" tab and set as below.
(6) Click "Run".
(7) After downloading, check "OK" message.
(6) Adjustment equipments: Color Analyzer(CA-210 or CA-110),
DDC Adjustment Jig, Service remote control.
(7) Push the "IN STOP" key - For memory initialization.
Case1 : Software version up
(4)
1. After downloading S/W by USB , TV set will reboot
automatically.
2. Push “In-stop” key.
filexxx.bin
(5)
3. Push “Power on” key.
4. Function inspection
5. After function inspection, Push “In-stop” key.
Case2 : Function check at the assembly line
1. When TV set is entering on the assembly line, Push
“In-stop” key at first.
(7)...........OK
(6)
2. Push “Power on” key for turning it on.
→ If you push “Power on” key, TV set will recover
channel information by itself.
3. After function inspection, Push “In-stop” key.
* USB DOWNLOAD
(1) Put the USB Stick to the USB socket.
(2) Automatically detecting update file in USB Stick.
- If your downloaded program version in USB Stick is Low,
it didn't work. But your downloaded version is High, USB
data is automatically detecting.
3. Main PCB check process
▪ APC - After Manual-Insert, executing APC
(3) Show the message "Copying files from memory".
(4) Updating is starting.
* Boot file Download
(1) Execute ISP program "Mstar ISP Utility" and then click
"Config" tab.
(2) Set as below, and then click "Auto Detect" and check "OK"
message.
If "Error" is displayed, check connection between computer,
jig, and set.
(3) Click "Read" tab, and then load download file(XXXX.bin)
by clicking "Read"
(5) Updating Completed, The TV will restart automatically.
(6) If your TV is turned on, check your updated version and
Tool option. (explain the Tool option, next stage)
(1)
* If downloading version is more high than your TV have, TV
can lost all channel data. In this case, you have to channel
recover. if all channel data is cleared, you didn’t have a DTV/
ATV test on production line.
filexxx.bin
* After downloading, have to adjust Tool Option again.
(1) Push "IN-START" key in service remote control.
(2) Select "Tool Option 1" and push "OK" key.
(3) Punch in the number. (Each model has their number)
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3.1. ADC Process
3.3. EDID data
(1) ADC
(1) HD RGB EDID data (RGB input : only LD21B support)
- Enter Service Mode by pushing "ADJ" key,
- Enter Internal ADC mode by pushing "►" key at "7. ADC
Calibration".
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
00 FF FF FF FF FF FF 00 1E 6D
a
b
10
c
01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26
20 0F 50 54 A1 08 00 81 C0 61 40 45 40 31 40 01 01
30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88
40 35 00 A0 5A 00 00 00 1C 01 1D 00 72 51 D0 1E 20
50 6E 28 55 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A
EZ ADJUST
ADC Calibration
ADC Comp 480i
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option 5
NG
NG
NG
ADC Comp 1080p
ADC RGB
60 3E 1F 46 10 00 0A 20 20 20 20 20 20
d
b
70
d
00
e
Start
Reset
5. Country Group
6. Area Option
(2) HD HDMI EDID data
7. ADC Calibration
8. White Balance
9. 10 Point WB
ඖ
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
00 FF FF FF FF FF FF 00 1E 6D
a
10
c
01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26
10. Test Pattern
11. EDID D/L
20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 01 01
30 01 01 01 01 01 01 66 21 50 B0 51 00 1B 30 40 70
40 36 00 40 84 63 00 00 1E 64 19 00 40 41 00 26 30
50 18 88 03 06 40 84 63 00 00 18 00 00 00 FD 00 3A
12. Sub B/C
13. Touch Sensitivity Setting
60 3E 1E 53 10 00 0A 20 20 20 20 20 20
70
80 02 03 22 F1 4E 10 1F 84 13 05 14 03 02 12 20 21
90 22 15 01 26 15 07 50 09 57 07
d
<Caution> Using "power on" key of the Adjustment remote
control, power on TV.
d
01
e
f
* ADC Calibration Protocol (RS232)
A0 80 1E 01 1D 80 18 71 1C 16 20 58 2C 25 00 A0 5A
B0 00 00 00 9E 01 1D 00 72 51 D0 1E 20 6E 28 55 00
C0 20 C2 31 00 00 1E 8C 0A D0 8A 20 E0 2D 10 10 3E
D0 96 00 A0 5A 00 00 00 18 02 3A 80 18 71 38 2D 40
E0 58 2C 45 00 A0 5A 00 00 00 1E 00 00 00 00 00 00
NO
Item
CMD 1 CMD 2 Data 0
Enter
Adjust
When transfer the ‘Mode In’,
Carry the command.
A
A
A
D
0
1
0
0
Adjust MODE ‘Mode In’
ADC adjust ADC Adjust
Automatically adjustment
(The use of a internal pattern)
F0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
e
Adjust Sequence
▪ aa 00 00 [Enter Adjust Mode]
(3) Detail EDID Options are below
a. Product ID
▪ xb 00 40 [Component1 Input (480i)]
▪ ad 00 10 [Adjust 480i Comp1]
▪ xb 00 60 [RGB Input (1024*768)] (only LD21B)
▪ ad 00 10 [Adjust 1024*768 RGB] (only LD21B)
▪ aa 00 90 End Adjust mode
MODEL NAME
HD/FHD Model
HEX
0001
EDID Table
01 00
DDC Function
Analog/Digital
b. Serial No: Controlled on production line.
c. Month, Year: Controlled on production line:
ex) Week : '01' -> '01'
* Required equipment : Adjustment remote control.
Year : '2012' -> '16' fix
d. Model Name(Hex):
3.2. EDID Download
▪ After enter Service Mode by pushing "ADJ" key.
▪ Enter EDID D/L menu.
cf) TV set’s model name in EDID data is below.
Model name
MODEL NAME(HEX)
▪ Enter "START" by pushing "OK" key.
<Caution> Never connect HDMI && D-sub cable when EDID
downloaded.
LG TV
00 00 00 FC 00 4C 47 20 54 56 0A 20 20 20 20 20 20 20 (LG TV)
e. Checksum: Changeable by total EDID data.
EZ ADJUST
EDID D/L
HD
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option 5
HDMI1
HDMI2
HDMI3
RGB
NG
NG
NG
NG
EDID C/S data
HDMI
RGB
N/A
Block 0
A4
Check sum
(Hex)
5B (HDMI1)
4B (HDMI2)
Block 1
N/A
Start
Reset
5. Country Group
6. Area Option
f. Vendor Specific(HDMI)
7. ADC Calibration
8. White Balance
9. 10 Point WB
Input
Model name(HEX)
67030C001000
HDMI1
HDMI2
HDMI3
10. Test Pattern
11. EDID D/L
ඖ
67030C002000
67030C003000
12. Sub B/C
13. Touch Sensitivity Setting
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* Connecting picture of the measuring instrument
(On Automatic control)
3.4 Function Check
- Check display and sound
Inside PATTERN is used when W/B is controlled. Connect to
auto controller or push Adjustment R/C POWER ON -> Enter
the mode of White-Balance, the pattern will come out.
■ Check Input and Signal items.
1) TV
2) AV (SCART / CVBS)
3) COMPONENT (480i)
4) RGB (PC : 1024 x 768 @ 60hz) (* RGB input : LD21B
only support)
5) HDMI
6) PC Audio In (* except LD21A chassis model)
* Display and Sound check is executed by Remote control.
Full White Pattern
CA-210
COLOR
ANALYZER
TYPE : CA-210
<Caution>
RS-232C Communication
Not to push the INSTOP key after completion if the function
inspection.
* Auto-control interface and directions
(1) Adjust in the place where the influx of light like floodlight
around is blocked. (illumination is less than 10 lux).
(2) Adhere closely the Color analyzer(CA210) to the module
less than 10 cm distance, keep it with the surface of the
Module and Color analyzer's prove vertically.(80° ~ 100°).
(3) Aging time
4. Total Assembly line process
4.1. Adjustment Preparation
▪ W/B Equipment condition
CA210
: CCFL/EEFL -> CH9, Test signal: Inner pattern(80IRE)
LED -> CH14, Test signal: Inner pattern(80IRE)
▪ If it is executed W/B adjustment in 2~3 minutes H/run, it is
adjusted by Target data
- After aging start, keep the power on (no suspension of
power supply) and heat-run over 5 minutes.
- Using 'no signal' or 'POWER ONLY' or the others, check
the back light on.
Mode
Temp
Coordinate spec
Target
X=0.285 (±0.002) X=0.287
Y=0.293 (±0.002) Y=0.296
Cool
9,300 K
▪ Auto adjustment Map(using RS-232C to USB cable)
RS-232C COMMAND
<Test Signal>
Inner pattern
(204gray,
X=0.295 (±0.002) X=0.297
Y=0.305 (±0.002) Y=0.308
Medium 8,000 K
Warm 6,500 K
[CMD ID
DATA]
00 00
00 ff
80IRE)
Wb
Wb
White Balance Start
White Balance End
X=0.313 (±0.002) X=0.315
Y=0.329 (±0.002) Y=0.332
RS-232C COMMAND
[CMD ID DATA]
CENTER
(DEFAULT)
▪ Edge LED W/B Table in process of time (LGD module & 65”
AUO module)
MIN
MAX
Cool
Mid
Ja
Warm
Cool Mid Warm
Cool
Medium
Warm
Aging
time
(Min)
R Gain jg
G Gain jh
B Gain ji
R Cut
jd
je
jf
00
00
00
172
172
192
64
192 192
192 192
192 172
192
192
192
128
128
128
GP4
X
y
x
y
x
y
Jb
269
280
279
277
276
274
272
271
270
269
273
287
285
284
283
280
277
275
274
273
285
296
295
293
292
290
288
287
286
285
293
307
305
304
303
300
297
295
294
293
313
320
319
317
316
314
312
311
310
309
329
337
335
334
333
330
327
325
324
323
Jc
1
2
3
4
5
6
7
8
9
0-2
3-5
64
64
64
64
64
64
G Cut
64
6-9
B Cut
64
10-19
20-35
36-49
50-79
80-119
Over 120
<Caution>
Color Temperature : COOL, Medium, Warm.
One of R Gain/G Gain/ B Gain should be kept on 0xC0, and
adjust other two lower than C0.(When R/G/B Gain are all
C0, it is the FULL Dynamic Range of Module)
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* Manual W/B process using adjust Remote control.
5. HI-POT Test
▪ After enter Service Mode by pushing "ADJ" key,
5.1. HI-POT auto-check preparation
▪ Enter White Balance by pushing " " key at "8. White
►
- Check the POWER cable and SIGNAL cable insertion condition
Balance".
EZ ADJUST
White Balance
5.2. HI-POT auto-check
(1) Pallet moves in the station. (POWER CORD / AV CORD is
tightly inserted)
Cool
172
172
192
64
Color Temp.
R-Gain
G-Gain
B-Gain
0. Tool Option1
1. Tool Option2
2. Tool Option3
3. Tool Option4
4. Tool Option5
5. Country Group
6. Area Option
7. ADC Calibration
8. White Balance
9. 10 Point WB
10. Test Pattern
11. EDID D/L
(2) Connect the AV JACK Tester.
(3) Controller (GWS103-4) on.
(4) HI-POT test (Auto)
R-Cut
G-Cut
B-Cut
64
64
ON
100
To Set
Test-Pattern
Backlight
Reset
- If Test is failed, Buzzer operates.
- If Test is passed, GOOD Lamp on and move to next proc-
ess automatically.
►
12. Sub B/C
13. Touch Sensitivity Setting
5.3. Checkpoint
(1) Test voltage
* After you finished all adjustments, Press "In-start" key and
compare Tool option and Area option value with its BOM, if
it is correctly same then unplug the AC cable. If it is not
same, then correct it same with BOM and unplug AC cable.
For correct it to the model's module from factory Jig model.
* Push the "IN STOP" key after completing the function
inspection. And Mechanical Power Switch must be set
“ON”.
- Touchable Metal : 3KV / min at 100mA
- SIGNAL : 3KV / min at 100mA
(2) TEST time: 1 second. (case : mass production )
(3) TEST POINT
- Touchable Metal => LIVE & NEUTRAL : Touchable Metal.
- SIGNAL => LIVE & NEUTRAL : SIGNAL.
6. Model name & Serial number D/L
▪ Press "Power on" key of service remote control.
(Baud rate : 115200 bps)
4.2. EYE-Q function check
(1) Turn on TV.
(2) Press EYE key of Adjustment remote control.
(3) Cover the Eye Q II sensor on the front of the using your
hand and wait for 6 seconds.
(4) Confirm that R/G/B value is lower than 10 of the "Raw
Data (Sensor data, Back light)". If after 6 seconds, R/G/B
value is not lower than 10, replace Eye Q II sensor.
(5) Remove your hand from the Eye Q II sensor and wait for 6
seconds.
▪ Connect USB to RS232 Signal Cable to USB Jack.
▪ Write Serial number.
▪ Must check the serial number at the Diagnostics of SET UP menu.
(Refer to below.)
(6) Confirm that "ok" pop up. If change is not seen, replace
6.1. Signal Table
CMD
LENGTH
ADH
ADL
DATA_1
. . .
Data_n
CS
DELAY
CMD : A0h
LENGTH : 85~94h (1~16 bytes)
ADH : EEPROM Sub Address high (00~1F)
ADL : EEPROM Sub Address low (00~FF)
Data : Write data
Eye Q II sensor.
CS : CMD + LENGTH + ADH + ADL + Data_1 +...+ Data_n
Delay : 20ms
4.3. Outgoing condition Configuration
■ When pressing IN-STOP key by SVC remocon, Red LED
are blinked alternatively. And then automatically turn off.
(Must not AC power OFF during blinking)
6.2. Comand Set
Adjust mode
CMD(hex)
LENGTH(hex)
84h+n
Description
n-bytes Write (n = 1~16)
EEPROM WRITE
A0h
* Description
FOS Default write : <7mode data> write
Vtotal, V_Frequency, Sync_Polarity, Htotal, Hstart, Vstart, 0,
Phase
Data write : Model Name and Serial Number write in EEPROM,.
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6.3. Method & notice
7. MAC Address & CI+ key download
(1) Serial number D/L is using of scan equipment.
(2) Setting of scan equipment operated by Manufacturing
Technology Group.
7.1 MAC Address
7.1.1 Equipment & Condition
▪ Play file : Serial.exe
(3) Serial number D/L must be conformed when it is produced in
production line, because serial number D/L is mandatory by
D-book 4.0.
▪ MAC Address edit
▪ Input Start / End MAC address
* Manual Download(Model Name and Serial Number)
If the TV set is downloaded by OTA or Service man, sometimes
model name or serial number is initialized.(Not always)
There is impossible to download by bar code scan, so It need
Manual download.
7.1.2 Download method
(1) Communication Prot connection
1) Press the "Instart" key of Adjustment remote control.
2) Go to the menu "6.Model Number D/L" like below photo.
3) Input the Factory model name or Serial number like photo.
Connection : PCBA (USB Port) → USB to Serial Adapter
(UC-232A) → RS-232C cable → PC(RS-232C port)
* Caution : LJ21* chassis support only UC-232A driver. (only
use this one. )
(2) MAC Address & CI+ Key Download
▪ Set CI+ Key path Directory at Start Mac & CI+ Download
Programme
▪ Com 1,2,3,4 and 115200(Baudrate)
4) Check the model name Instart menu.
(ex 32LV3400-ZG)
→
Factory name displayed.
5) Check the Diagnostics.(DTV country only) → Buyer model
displayed.(ex 32LV3400-ZG)
GP4_LOW
▪ Port connection button click(1)
▪ Push the (2) MAC Address write.
▪ At success Download, check the OK (3)
▪ Start CI+ Key Download, Push the (4)
▪ Check the OK or NG
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7.2 LAN Inspection
7.2.1. Equipment & Condition
▪ Each other connection to LAN Port of IP Hub and Jig
7.2.1. LAN inspection solution
▪ LAN Port connection with PCB
▪ Network setting at MENU Mode of TV
▪ Setting automatic IP
▪ Setting state confirmation
-> If automatic setting is finished, you confirm IP and MAC
Address.
7.3. LAN PORT INSPECTION(PING TEST)
Connect SET -> LAN port == PC -> LAN Port
SET
PC
7.3.1. Equipment setting
(1) Play the LAN Port Test PROGRAM.
(2) Input IP set up for an inspection to Test Program.
*IP Number : 12.12.2.2
7.3.2. LAN PORT inspection (PING TEST)
(1) Play the LAN Port Test Program.
(2) Connect each other LAN Port Jack.
(3) Play Test (F9) button and confirm OK Message.
(4) Remove LAN cable.
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DISASSEMBLY
2
3
1
[Caution]
Please unlock latches from Bottom Side, for separating Back Cover from CABINET
[Method]
Firstly, Grab left side of Speaker Vent Hole(①) and then unlock left side latches(②) slowly.
Secondly, Grab center(③) of Back Cover and then separate Back Cover slowly.
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BLOCK DIAGRAM
e
d
i
S
CI Slot
e
d
i
S
r
a
e
R
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EXPLODED VIEW
IMPORTANT SAFETY NOTICE
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These
parts are identified by in the Schematic Diagram and EXPLODED VIEW.
It is essential that these special safety parts should be replaced with the same components as
recommended in this manual to prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
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Contents of LCD TV Standard Repair Process
No.
1
Error symptom (High category)
Error symptom (Mid category)
No video/Normal audio
No video/No audio
Page
1
Remarks
2
2
3
Tuning fail, Picture broken/ Freezing
Color error
3, 4
5
A. Video error
4
Vertical/Horizontal bar, residual image,
light spot, external device color error
5
6
7
6
7
8
No power
B. Power error
Off when on, off while viewing, power
auto on/off
8
No audio/Normal video
9
C. Audio error
9
Wrecked audio/discontinuation/noise
Remote control & Local switch checking
External device recognition error
Circuit noise, mechanical noise
Exterior defect
10
11
12
13
14
10
11
12
13
D. Function error
E. Noise
F. Exterior error
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
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Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
1
Error symptom
Content
Page
A1
Remarks
Check LCD back light with naked eye
LED driver B+ 24V measuring method
Check White Balance value
2
A2
A. Video error_ No video/Normal
audio
3
A3
4
Power Board voltage measuring method
TUNER input signal strength checking method
LCD-TV Version checking method
LCD TV connection diagram
A4
6
A5
A. Video error_ No video/Video
lag/stop
7
A6
9
A7
A8
A9
Check Link Cable (LVDS) reconnection
condition
10
A. Video error_Color error
11
12
Adjustment Test pattern - ADJ Key
LCD TV connection diagram
A10
A8
A8
A9
A. Video error_Vertical/Horizontal bar, Check Link Cable (LVDS) reconnection
13
residual image, light spot
condition
14
15
16
Adjustment Test pattern - ADJ Key
Exchange T-Con Board (1)
Exchange T-Con Board (2)
A10
A-1/5
A-2/5
<Appendix>
55” : driver board
Other : PSU
17
Exchange LED driver Board (PSU)
A-3/5
Defected Type caused by T-Con/
Inverter/ Module
18
19
Exchange Module itself (1)
Exchange Module itself (2)
A-4/5
A-5/5
Continue to the next page
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
No video/ Normal audio
Revised date
1/14
First of all, Check whether all of cables between board is inserted properly or not.
☞A1
☞A4
Y
Y
No video
Normal audio
Replace T-con
Board or module
Y
Normal
audio
Check Back Light
On with naked eye
Check Power
Board
12v,3.5v etc.
Normal
voltage
On
N
N
Move to No
video/No audio
Repair Power
Board or parts
Check Power Board 24v output
☞A2
Replace Inverter
or module
Y
Normal
voltage
End
N
Repair Power
Board or parts
※Precaution
☞A6 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
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Standard Repair Process
Established
date
A. Video error
2012 . 01
.14
Error
symptom
LCD TV
No video/ No audio
Revised date
2/14
☞A4
Check various
Check and
replace
MAIN B/D
Y
Normal
voltage?
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
No Video/
No audio
N
End
Replace Power
Board and repair
parts
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Picture broken/ Freezing
Revised date
3/14
. By using Digital signal level meter
☞ A5
. By using Diagnostics menu on OSD
( Menu→ Set up→ Support → Signal Test )
- Signal strength (Normal : over 50%)
Check RF Signal level
Y
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
Normal
Signal?
N
☞ A6
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Y
Y
N
Normal
Picture?
Check
S/W Version
SVC
Bulletin?
Check
Tuner soldering
Normal
Picture?
Close
Y
N
N
S/W Upgrade
N
Normal
Picture?
Contact with signal distributor
or broadcaster (Cable or Air)
Replace
Main B/D
N
Normal
Picture?
Y
Y
Close
Close
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Tuning fail, Picture broken/ Freezing
Revised date
4/14
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box, Different maker TV etc
☞ A5
Check RF Signal level
☞ A6
Check satellite setting.
- Check LNB frequency.
- Check satellite
- Check Satellite connection
(DiSEqC, motor, etc…)
Y
N
Normal
Signal?
Normal
setting?
Check
S/W Version
SVC
Bulletin?
Check
Tuner soldering
Replace
Main B/D
Y
Y
N
N
S/W Upgrade
Contact with
Change satellite setting
(match with installed ANT)
N
signal distributor
or broadcaster
(Cable or Air)
Normal
Picture?
Y
N
Normal
Picture?
Close
Close
Y
Close
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Color error
Revised date
5/14
☞A7
☞ A8/ A9
Y
※ Check
Check color by input
and replace
Link Cable
(LVDS) and
contact
Y
Y
-External Input
-COMPONENT
-RGB
Color
error?
Color
error?
Color
error?
Replace module
Replace Main B/D
-HDMI/DVI
N
N
N
condition
Check error
color input
mode
End
☞A10
Check
external
device and
cable
External Input/
Component
error
External device
Y
Check Test pattern
/Cable
normal
Replace Main B/D
N
Request repair
for external
device/cable
N
Y
RGB/
HDMI/DVI
error
Check external
device and
cable
External device
/Cable
Replace Main B/D
normal
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Vertical / Horizontal bar, residual image,
light spot, external device color error
Revised date
6/14
Vertical/Horizontal bar, residual image, light spot
Replace
Module
☞A7
☞ A8/ A9
N
Check color condition by input
Check external
-External Input
-Component
-RGB
N
Check and
replace Link
Cable
Y
Y
Screen
device
connection
condition
Screen
normal?
Screen
normal?
Normal?
Replace Main B/D
normal?
-HDMI/DVI
N
Y
N
Y
Request repair
for external
device
End
Replace
module
End
☞A10
Check Test pattern
External device screen error-Color error
Check screen
condition by
input
-External Input
-Component
-RGB
External
Input
error
N
Check S/W Version
Check
version
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Screen
normal?
Replace
Main B/D
-HDMI/DVI
Y
Component
error
Y
S/W Upgrade
Request repair for
external device
RGB
error
Y
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Normal
screen?
N
Replace
Screen
normal?
Main B/D
HDMI/
DVI
Y
End
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
B. Power error
2012. 01 .14
Error
symptom
LCD TV
No power
Revised date
7/14
☞A11
☞A13
DC Power on
by pressing Power Key
On Remote control
N
Replace
Power
B/D
Y
Y
Check
Power LED
Power LED
On?
Normal
Check Power
On ‘”High”
OK?
operation?
. Stand-By: Red
Y
Check Power cord
was inserted properly
Replace Main B/D
☞A4
Measure voltage of each output of Power B/D
N
Normal?
Y
Y
Y
Normal
voltage?
Replace Main B/D
※
Close
Normal
Check ST-BY 3.5V
voltage?
N
☞A12
Replace Power B/D
N
Replace Power
B/D
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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LGE Internal Use Only
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Standard Repair Process
Established
date
B. Power error
2012. 01 .14
Error
symptom
LCD TV
Off when on, off while viewing, power auto on/off
Revised date
8/14
Check outlet
☞A14
N
Y
CPU
Abnormal
Check Power Off
Check A/C cord
Error?
Normal?
End
Replace Main B/D
Mode
N
Check for all 3- phase
power out
Y
Abnormal
1
Replace Power B/D
☞A13
Fix A/C cord & Outlet
and check each 3
phase out
(If Power Off mode
is not displayed)
Check Power B/D
voltage
Y
Normal
voltage?
Replace Main B/D
N
※ Caution
Check and fix exterior
of Power B/D Part
Replace Power B/D
Status
Power off List
Explanation
Power off by REMOTE CONTROL
Power off by OFF TIMER
* Please refer to the all cases which
can be displayed on power off mode.
"POWEROFF_REMOTEKEY"
"POWEROFF_OFFTIMER"
"POWEROFF_SLEEPTIMER"
"POWEROFF_INSTOP"
Power off by SLEEP TIMER
Power off by INSTOP KEY
"POWEROFF_AUTOOFF"
Power off by AUTO OFF
Normal "POWEROFF_ONTIMER"
"POWEROFF_RS232C"
Power off by ON TIMER
Power off by RS232C
"POWEROFF_RESREC"
"POWEROFF_RECEND"
"POWEROFF_SWDOWN"
"POWEROFF_UNKNOWN"
Power off by Reserved Record
Power off by End of Recording
Power off by S/W Download
Power off by unknown status except listed case
Power off by abnormal status except CPU trouble
Power off by CPU Abnormal
"POWEROFF_ABNORMAL1"
Abnormal
"POWEROFF_CPUABNORMAL"
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
C. Audio error
2012. 01 .14
Error
symptom
LCD TV
Revised date
No audio/ Normal video
9/14
☞A16
Check user
menu >
Speaker off
Check audio B+
24V of Power
Board
N
Y
No audio
Screen normal
Normal
voltage
Off
Y
N
Cancel OFF
Replace Power Board and repair parts
N
Check
Speaker
Disconnection
Replace MAIN Board
End
disconnection
Y
Replace Speaker
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
C. Audio error
2012. 01 .14
Error
symptom
LCD TV
Wrecked audio/ discontinuation/noise
Revised date
10/14
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
☞A16
Wrecked audio/
Discontinuation/
Noise for
Check and replace
speaker and
connector
Check audio
B+ Voltage (24V)
all audio
Check input
signal
-RF
-External Input
signal
Y
Y
Signal
normal?
Wrecked audio/
Discontinuation/
Noise only
Normal
voltage?
Replace Main B/D
N
for D-TV
N
Wrecked audio/
Discontinuation/
Noise only
Replace Power B/D
for Analog
(When RF signal is not
received)
Request repair to external
cable/ANT provider
End
Replace Main B/D
Wrecked audio/
Discontinuation/
Noise only
for External Input
(In case of
N
External Input
signal error)
Check and fix
external device
Connect and check
other external
device
Normal
audio?
Y
Check and fix external device
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
D. Function error
2012. 01 .14
Error
symptom
LCD TV
Remote control & Local switch checking
Revised date
11/14
Replace
Main B/D
☞A17
☞A17
☞A17
Check & Repair
Cable connection
Connector solder
Check B+
3.5V
On Main B/D
N
Y
Y
Check R/C itself
Operation
Y
Check IR
Output signal
Normal
operating?
Normal
operating?
Normal
Voltage?
Normal
Signal?
N
N
N
Y
☞A4
Close
Repair/Replace
IR B/D
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
Normal
operating?
If R/C operate,
Close
Explain the customer
cause is interference
from light in room.
N
Replace R/C
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
D. Function error
2012. 01 .14
Error
symptom
LCD TV
External device recognition error
Revised date
12/14
Check technical
information
- Fix information
- S/W Version
Y
Check
input
signal
External Input and
Component
Recognition error
N
Signal
input?
Technical
information?
Replace Main B/D
Replace Main B/D
N
Y
RGB,HDMI/
DVI, Optical
Recognition error
Check and fix
external device/cable
Fix in
accordance
with technical
information
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
E. Noise
2012. 01 .14
Error
symptom
LCD TV
Circuit noise, mechanical noise
Revised date
13/14
Replace PSU (with LED driver)
Check
location of
noise
Circuit
noise
Identify
nose type
OR
Replace LED driver
Mechanical
noise
Check location
of noise
※ When the nose is severe, replace the module
(For models with fix information, upgrade the
S/W or provide the description)
※ Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage.
※ Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
OR
※ If there is a “Tak Tak” noise from the
cabinet, refer to the KMS fix information and
then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
F. Exterior defect
2012. 01 .14
Error
symptom
LCD TV
Exterior defect
Revised date
14/14
Zoom part with
exterior damage
Module
damage
Replace module
Cabinet
damage
Replace cabinet
Remote
controller
damage
Replace remote controller
Stand
dent
Replace stand
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Contents of LCD TV Standard Repair Process
No.
1
Error symptom (High category)
Error symptom (Mid category)
No video/Normal audio
No video/No audio
Page
1
Remarks
2
2
3
Tuning fail, Picture broken/ Freezing
Color error
3, 4
5
A. Video error
4
Vertical/Horizontal bar, residual image,
light spot, external device color error
5
6
7
6
7
8
No power
B. Power error
Off when on, off while viewing, power
auto on/off
8
No audio/Normal video
9
C. Audio error
9
Wrecked audio/discontinuation/noise
Remote control & Local switch checking
External device recognition error
Circuit noise, mechanical noise
Exterior defect
10
11
12
13
14
10
11
12
13
D. Function error
E. Noise
F. Exterior error
First of all, Check whether there is SVC Bulletin in GCSC System for these model.
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
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Contents of LCD TV Standard Repair Process Detail Technical Manual
No.
1
Error symptom
Content
Page
A1
Remarks
Check LCD back light with naked eye
LED driver B+ 24V measuring method
Check White Balance value
2
A2
A. Video error_ No video/Normal
audio
3
A3
4
Power Board voltage measuring method
TUNER input signal strength checking method
LCD-TV Version checking method
LCD TV connection diagram
A4
6
A5
A. Video error_ No video/Video
lag/stop
7
A6
9
A7
A8
A9
Check Link Cable (LVDS) reconnection
condition
10
A. Video error_Color error
11
12
Adjustment Test pattern - ADJ Key
LCD TV connection diagram
A10
A8
A8
A9
A. Video error_Vertical/Horizontal bar, Check Link Cable (LVDS) reconnection
13
residual image, light spot
condition
14
15
16
Adjustment Test pattern - ADJ Key
Exchange T-Con Board (1)
Exchange T-Con Board (2)
A10
A-1/5
A-2/5
<Appendix>
55” : driver board
Other : PSU
17
Exchange LED driver Board (PSU)
A-3/5
Defected Type caused by T-Con/
Inverter/ Module
18
19
Exchange Module itself (1)
Exchange Module itself (2)
A-4/5
A-5/5
Continue to the next page
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
No video/ Normal audio
Revised date
1/14
First of all, Check whether all of cables between board is inserted properly or not.
☞A1
☞A4
Y
Y
No video
Normal audio
Replace T-con
Board or module
Y
Normal
audio
Check Back Light
On with naked eye
Check Power
Board
12v,3.5v etc.
Normal
voltage
On
N
N
Move to No
video/No audio
Repair Power
Board or parts
Check Power Board 24v output
☞A2
Replace Inverter
or module
Y
Normal
voltage
End
N
Repair Power
Board or parts
※Precaution
☞A6 & A3
Always check & record S/W Version and White
Balance value before replacing the Main Board
Replace Main Board
Re-enter White Balance value
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012 . 01
.14
Error
symptom
LCD TV
No video/ No audio
Revised date
2/14
☞A4
Check various
Check and
replace
MAIN B/D
Y
Normal
voltage?
voltages of Power
Board ( 3.5V,12V,20V
or 24V…)
No Video/
No audio
N
End
Replace Power
Board and repair
parts
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Picture broken/ Freezing
Revised date
3/14
. By using Digital signal level meter
☞ A5
. By using Diagnostics menu on OSD
( Menu→ Set up→ Support → Signal Test )
- Signal strength (Normal : over 50%)
Check RF Signal level
Y
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ DVD Player ,Set-Top-Box, Different maker TV etc`
Normal
Signal?
N
☞ A6
Check RF Cable
Connection
1. Reconnection
2. Install Booster
Y
Y
N
Normal
Picture?
Check
S/W Version
SVC
Bulletin?
Check
Tuner soldering
Normal
Picture?
Close
Y
N
N
S/W Upgrade
N
Normal
Picture?
Contact with signal distributor
or broadcaster (Cable or Air)
Replace
Main B/D
N
Normal
Picture?
Y
Y
Close
Close
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Tuning fail, Picture broken/ Freezing
Revised date
4/14
Check whether other equipments have problem or not.
(By connecting RF Cable at other equipment)
→ Set-Top-Box, Different maker TV etc
☞ A5
Check RF Signal level
☞ A6
Check satellite setting.
- Check LNB frequency.
- Check satellite
- Check Satellite connection
(DiSEqC, motor, etc…)
Y
N
Normal
Signal?
Normal
setting?
Check
S/W Version
SVC
Bulletin?
Check
Tuner soldering
Replace
Main B/D
Y
Y
N
N
S/W Upgrade
Contact with
Change satellite setting
(match with installed ANT)
N
signal distributor
or broadcaster
(Cable or Air)
Normal
Picture?
Y
N
Normal
Picture?
Close
Close
Y
Close
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Color error
Revised date
5/14
☞A7
☞ A8/ A9
Y
※ Check
Check color by input
and replace
Link Cable
(LVDS) and
contact
Y
Y
-External Input
-COMPONENT
-RGB
Color
error?
Color
error?
Color
error?
Replace module
Replace Main B/D
-HDMI/DVI
N
N
N
condition
Check error
color input
mode
End
☞A10
Check
external
device and
cable
External Input/
Component
error
External device
Y
Check Test pattern
/Cable
normal
Replace Main B/D
N
Request repair
for external
device/cable
N
Y
RGB/
HDMI/DVI
error
Check external
device and
cable
External device
/Cable
Replace Main B/D
normal
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
A. Video error
2012. 01 .14
Error
symptom
LCD TV
Vertical / Horizontal bar, residual image,
light spot, external device color error
Revised date
6/14
Vertical/Horizontal bar, residual image, light spot
Replace
Module
☞A7
☞ A8/ A9
N
Check color condition by input
Check external
-External Input
-Component
-RGB
N
Check and
replace Link
Cable
Y
Y
Screen
device
connection
condition
Screen
normal?
Screen
normal?
Normal?
Replace Main B/D
normal?
-HDMI/DVI
N
Y
N
Y
Request repair
for external
device
End
Replace
module
End
☞A10
Check Test pattern
External device screen error-Color error
Check screen
condition by
input
-External Input
-Component
-RGB
External
Input
error
N
Check S/W Version
Check
version
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Screen
normal?
Replace
Main B/D
-HDMI/DVI
Y
Component
error
Y
S/W Upgrade
Request repair for
external device
RGB
error
Y
Connect other external
device and cable
(Check normal operation of
External Input, Component,
RGB and HDMI/DVI by
connecting Jig, pattern
Generator ,Set-top Box etc.
N
Normal
screen?
N
Replace
Screen
normal?
Main B/D
HDMI/
DVI
Y
End
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
B. Power error
2012. 01 .14
Error
symptom
LCD TV
No power
Revised date
7/14
☞A11
☞A13
DC Power on
by pressing Power Key
On Remote control
N
Replace
Power
B/D
Y
Y
Check
Power LED
Power LED
On?
Normal
Check Power
On ‘”High”
OK?
operation?
. Stand-By: Red
Y
Check Power cord
was inserted properly
Replace Main B/D
☞A4
Measure voltage of each output of Power B/D
N
Normal?
Y
Y
Y
Normal
voltage?
Replace Main B/D
※
Close
Normal
Check ST-BY 3.5V
voltage?
N
☞A12
Replace Power B/D
N
Replace Power
B/D
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Standard Repair Process
Established
date
B. Power error
2012. 01 .14
Error
symptom
LCD TV
Off when on, off while viewing, power auto on/off
Revised date
8/14
Check outlet
☞A14
N
Y
CPU
Abnormal
Check Power Off
Check A/C cord
Error?
Normal?
End
Replace Main B/D
Mode
N
Check for all 3- phase
power out
Y
Abnormal
1
Replace Power B/D
☞A13
Fix A/C cord & Outlet
and check each 3
phase out
(If Power Off mode
is not displayed)
Check Power B/D
voltage
Y
Normal
voltage?
Replace Main B/D
N
※ Caution
Check and fix exterior
of Power B/D Part
Replace Power B/D
Status
Power off List
Explanation
Power off by REMOTE CONTROL
Power off by OFF TIMER
* Please refer to the all cases which
can be displayed on power off mode.
"POWEROFF_REMOTEKEY"
"POWEROFF_OFFTIMER"
"POWEROFF_SLEEPTIMER"
"POWEROFF_INSTOP"
Power off by SLEEP TIMER
Power off by INSTOP KEY
"POWEROFF_AUTOOFF"
Power off by AUTO OFF
Normal "POWEROFF_ONTIMER"
"POWEROFF_RS232C"
Power off by ON TIMER
Power off by RS232C
"POWEROFF_RESREC"
"POWEROFF_RECEND"
"POWEROFF_SWDOWN"
"POWEROFF_UNKNOWN"
Power off by Reserved Record
Power off by End of Recording
Power off by S/W Download
Power off by unknown status except listed case
Power off by abnormal status except CPU trouble
Power off by CPU Abnormal
"POWEROFF_ABNORMAL1"
Abnormal
"POWEROFF_CPUABNORMAL"
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Standard Repair Process
Established
date
C. Audio error
2012. 01 .14
Error
symptom
LCD TV
Revised date
No audio/ Normal video
9/14
☞A16
Check user
menu >
Speaker off
Check audio B+
24V of Power
Board
N
Y
No audio
Screen normal
Normal
voltage
Off
Y
N
Cancel OFF
Replace Power Board and repair parts
N
Check
Speaker
Disconnection
Replace MAIN Board
End
disconnection
Y
Replace Speaker
Copyright © 2012 LG Electronics. Inc. All rights reserved.
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Standard Repair Process
Established
date
C. Audio error
2012. 01 .14
Error
symptom
LCD TV
Wrecked audio/ discontinuation/noise
Revised date
10/14
→ abnormal audio/discontinuation/noise is same after “Check input signal” compared to No audio
☞A16
Wrecked audio/
Discontinuation/
Noise for
Check and replace
speaker and
connector
Check audio
B+ Voltage (24V)
all audio
Check input
signal
-RF
-External Input
signal
Y
Y
Signal
normal?
Wrecked audio/
Discontinuation/
Noise only
Normal
voltage?
Replace Main B/D
N
for D-TV
N
Wrecked audio/
Discontinuation/
Noise only
Replace Power B/D
for Analog
(When RF signal is not
received)
Request repair to external
cable/ANT provider
End
Replace Main B/D
Wrecked audio/
Discontinuation/
Noise only
for External Input
(In case of
N
External Input
signal error)
Check and fix
external device
Connect and check
other external
device
Normal
audio?
Y
Check and fix external device
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Download from Www.Somanuals.com. All Manuals Search And Download.
Standard Repair Process
Established
date
D. Function error
2012. 01 .14
Error
symptom
LCD TV
Remote control & Local switch checking
Revised date
11/14
Replace
Main B/D
☞A17
☞A17
☞A17
Check & Repair
Cable connection
Connector solder
Check B+
3.5V
On Main B/D
N
Y
Y
Check R/C itself
Operation
Y
Check IR
Output signal
Normal
operating?
Normal
operating?
Normal
Voltage?
Normal
Signal?
N
N
N
Y
☞A4
Close
Repair/Replace
IR B/D
Check R/C Operating
When turn off light
in room
Check & Replace
Baterry of R/C
Check 3.5v on Power B/D
Replace Power B/D or
Replace Main B/D
(Power B/D don’t have problem)
Normal
operating?
If R/C operate,
Close
Explain the customer
cause is interference
from light in room.
N
Replace R/C
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Download from Www.Somanuals.com. All Manuals Search And Download.
Standard Repair Process
Established
date
D. Function error
2012. 01 .14
Error
symptom
LCD TV
External device recognition error
Revised date
12/14
Check technical
information
- Fix information
- S/W Version
Y
Check
input
signal
External Input and
Component
Recognition error
N
Signal
input?
Technical
information?
Replace Main B/D
Replace Main B/D
N
Y
RGB,HDMI/
DVI, Optical
Recognition error
Check and fix
external device/cable
Fix in
accordance
with technical
information
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Download from Www.Somanuals.com. All Manuals Search And Download.
Standard Repair Process
Established
date
E. Noise
2012. 01 .14
Error
symptom
LCD TV
Circuit noise, mechanical noise
Revised date
13/14
Replace PSU (with LED driver)
Check
location of
noise
Circuit
noise
Identify
nose type
OR
Replace LED driver
Mechanical
noise
Check location
of noise
※ When the nose is severe, replace the module
(For models with fix information, upgrade the
S/W or provide the description)
※ Mechanical noise is a natural
phenomenon, and apply the 1st level
description. When the customer does not
agree, apply the process by stage.
※ Describe the basis of the description
in “Part related to nose” in the Owner’s
Manual.
OR
※ If there is a “Tak Tak” noise from the
cabinet, refer to the KMS fix information and
then proceed as shown in the solution manual
(For models without any fix information,
provide the description)
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Download from Www.Somanuals.com. All Manuals Search And Download.
Standard Repair Process
Established
date
F. Exterior defect
2012. 01 .14
Error
symptom
LCD TV
Exterior defect
Revised date
14/14
Zoom part with
exterior damage
Module
damage
Replace module
Cabinet
damage
Replace cabinet
Remote
controller
damage
Replace remote controller
Stand
dent
Replace stand
Copyright © 2012 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
LGE Internal Use Only
Download from Www.Somanuals.com. All Manuals Search And Download.
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