Compaq MV7500
SERVICE MANUAL
LG: CA-110
LG CQ771G
MODEL: S7500 (PE1165T), S7500 (PE1165),
MV7500 (PE1165U), MV7500 (PE1165),
CV7500 (PE1165U)
CONTENTS
SPECIFICATIONS ................................................... 2
SAFETY PRECAUTIONS ........................................ 3
TIMING CHART ....................................................... 4
OPERATING INSTRUCTIONS ................................ 5
WIRING DIAGRAM ................................................. 6
ADJUSTMENT ...................................................... 10
TROUBLESHOOTING GUIDE .............................. 12
EXPLODED VIEW................................................... 22
REPLACEMENT PARTS LIST ............................... 24
PIN CONFIGURATION........................................... 29
PACKING AND ACCESSORIES............................ 31
SCHEMATIC DIAGRAM......................................... 32
PRINTED CIRCUIT BOARD................................... 34
BLOCK DIAGRAM ................................................... 7
DESCRIPTION OF BLOCK DIAGRAM.....................8
SPECIFICATIONS
1. PICTURE TUBE
Size
DefIection Angle
Neck Diameter
Dot Pitch
3-2. Power Consumption
: 17 inch
: 90°
: 29.1 mm
: 0.28 mm
: Anti-Glare
: 16.06"
MODE
POWER CONSUMPTION
less than 100 W
less than 5 W
LED COLOR
GREEN
AMBER
AMBER
OFF
FULL POWER
STAND-BY
SUSPEND
Face Treatment
Diagonal Inch
less than 5 W
POWER OFF
less than 5 W
2. SIGNAL
2-1. Horizontal & Vertical Sync
4. DISPLAY AREA
4-1. Active Video Area :
1) Input Voltage Level : Low=0~1.2V, High=2.5~5.5V
2) Sync Polarity
: Positive or Negative
• Max Image Size - 326.7 x 245.5 mm (12.86" x 9.67")
• Preset Image Size - 312 x 234 mm (12.28" x 9.21")
2-2. Video Input Signal
1) Voltage Level
a) Color 0, 0
4-2. Display Color
4-3. Display Resolution : 1280 x 1024 / 60Hz
(Non-Interlace)
: Full Colors
: 0 ~ 0.7 Vp-p
: 0 Vp-p
: 0.467 Vp-p
: 0.7 Vp-p
b) Color 7, 0
c) Color 15, 0
4-4. Video Bandwidth
: 110 MHz
2) Input Impedance : 75 Ω
5. ENVIRONMENT
5-1. Operating Temperature: 10°C ~ 35°C (50°F ~ 95°F)
(Ambient)
3) Video Color
: R, G, B Analog
4) Signal Format
: Refer to the Timing Chart
5-2. Relative Humidity
: 8%~ 80%
(Non-condensing)
: 5,000 m
2-3. Signal Connector
3 row 15-pin Connector (Attached)
5-3. Altitude
2-4. Scanning Frequency
6. DIMENSIONS (with TILT/SWIVEL)
Horizontal
Vertical
: 30 ~ 70 kHz
: 50 ~ 140 Hz
Width
Depth
Height
: 404.0 mm (15.90 inch)
: 438.5 mm (17.26 inch)
: 426.0 mm (16.77 inch)
3. POWER SUPPLY
3-1. Power Range
7. WEIGHT (with TILT/SWIVEL)
Net Weight
: 15.1 kg (33.29 lbs.)
: 17.8 kg (39.24 lbs.)
AC 100~240V , 50/60Hz, 2.0A
Gross Weight
SAFETY PRECAUTIONS
SAFETY-RELATED COMPONENT WARNING!
X-RADIATION
There are special components used in this color monitor
which are important for safety. These parts are marked
on the schematic diagram and the replacement
parts list. It is essential that these critical parts should be
replaced with the manufacturer's specified parts to
prevent X-radiation, shock, fire, or other hazards. Do not
modify the original design without obtaining written
permission from manufacturer or you will void the original
parts and labor guarantee.
The only potential source of X-radiation is the picture tube.
However, when the high voltage circuitry is operating
properly there is no possibility of an X-radiation problem.
The basic precaution which must be exercised is keep the
high voltage at the factory recommended level; the normal
high voltage is about 25.5kV. The following steps describe
how to measure the high voltage and how to prevent X-
radiation.
Note : It is important to use an accurate high voltage
CAUTION: No modification of any circuit should be
attempted.
meter calibrated periodically.
Service work should be performed only after
you are thoroughly familiar with all of the
following safety checks and servicing
guidelines.
•
To measure the high voltage, use a high impedance
high voltage meter, connect (–) to chassis and (+) to
the CDT anode cap.
•
•
•
Set the brightness control to maximum point at full
white pattern.
SAFETY CHECK
Measure the high voltage. The high voltage meter
should be indicated at the factory recommended level.
If the meter indication exceeds the maximum level,
immediate service is required to prevent the possibility
of premature component failure.
Care should be taken while servicing this color monitor
because of the high voltage used in the deflection circuits.
These voltages are exposed in such areas as the
associated flyback and yoke circuits.
•
To prevent X-radiation possibility, it is essential to use
the specified picture tube.
FIRE & SHOCK HAZARD
An isolation transformer must be inserted between the
color monitor and AC power line before servicing the
chassis.
•
In servicing, attention must be paid to the original lead
dress specially in the high voltage circuit. If a short
circuit is found, replace all parts which have been
overheated as a result of the short circuit.
All the protective devices must be reinstalled per the
original design.
CAUTION:
Please use only a plastic screwdriver to protect yourself
from shock hazard during service operation.
•
•
Soldering must be inspected for the cold solder joints,
frayed leads, damaged insulation, solder splashes, or
the sharp points. Be sure to remove all foreign
materials.
IMPLOSION PROTECTION
All used display tubes are equipped with an integral
implosion protection system, but care should be taken to
avoid damage and scratching during installation. Use only
same type display tubes.
TIMING CHART
VIDEO
SYNC
B
D
A
E
C
F
<< Dot Clock (MHz), Horizontal Frequency (kHz), Vertical Frequency (Hz), Horizontal etc... (µs), Vertical etc... (ms) >>
Sync
Polarity
H/V
Sort
Total Period
(E)
Video Active
Time (A)
Sync Duration
(D)
Blanking Time
(B)
Back Porch
(F)
Front Porch
(C)
Mode
Resolution
Frequency
H
V
H
V
H
V
H
V
H
V
H
V
H
V
H
V
H
V
–
–
–
–
–
–
–
+
+
+
+
+
+
+
+
+
+
+
37.500
75.000
31.469
59.940
43.269
85.008
31.470
70.080
46.880
75.010
53.674
85.061
60.023
75.029
68.677
84.997
63.98
26.667
13.333
31.778
16.683
23.112
11.764
31.778
14.269
21.330
13.331
18.631
11.756
16.660
13.328
14.561
11.765
15.63
20.317
12.800
25.422
15.253
17.778
11.093
25.422
12.711
16.160
12.798
14.222
11.178
13.003
12.795
10.836
11.183
11.85
6.349
0.533
6.356
1.430
5.334
0.671
6.356
1.558
5.170
0.533
4.409
0.578
3.657
0.533
3.725
0.582
3.78
2.032
0.080
3.813
0.064
1.556
0.069
3.813
0.064
1.620
0.064
1.138
0.056
1.219
0.050
1.061
0.044
1.04
3.810
0.427
1.907
1.048
2.222
0.579
1.907
1.080
3.230
0.448
2.702
0.503
2.235
0.466
2.201
0.523
2.30
0.508
0.027
0.636
0.318
1.556
0.023
0.636
0.414
0.320
0.021
0.569
0.019
0.203
0.017
0.508
0.015
0.44
640x480
75Hz
1
640x480
60Hz
2
3
4
5
6
7
8
9
640x480
85Hz
720x400
70Hz
800x600
75Hz
800x600
85Hz
1024x768
75Hz
1024x768
85Hz
1280x1024
60Hz
60.02
16.661
16.005
0.656
0.047
0.594
0.015
OPERATING INSTRUCTIONS
FRONT VIEW
REAR VIEW
AC Power Socket
Signal Connector
Power ON/OFF Button
See Front Control Panel
Front Control Panel
Coloreal M
T
4
2
1
3
4.
Select
1.
Power/LED
Launches on-screen displays, selects functions and
adjustments, and exits menus and On-Screen Display.
Controls power to the monitor.
The LED on the power button is illuminated when the
power is on.
5. Hot Key
Left Adjustment
Just select left adjustment key without OSD display.
2.
3.
Right Adjustment
Moves clockwise through menu options or increases
adjustment levels.
Contrast menu display.
Left Adjustment
Right adjuatment
M
oves counter-clockwise through menu options or
Just select
right adjustment key with OSD display.
decreases adjustment levels.
Brightness menu display.
FBT
< OSD Control >
H.V
80V
Heater ( 6.3V )
Coloreal M
T
Signal
Cable
+
MENU
H-Sync Sig
V-Sync Sig
I2C DATA(SDA)
I2C CLOCK(SCL)
R
G
B
POWER
VIDEO
VIDEO
MAIN AMP
(IC303)
PRE-AMP
(IC302)
LM1269
DY
CDT
CONTRAST
BRIGHTNESS
H POSITION
H SIZE
LM2467
OSD IC
(IC301)
NT6872
5V
MICOM
(IC401)
15V
5V
I2C
R/G/B
V POSITION
V SIZE
SPCC
SCL / SDA
H/V Sync,
PWM Control
CUT OFF IC
(IC304)
LM2480
5V
Drive/Contrast
I2C
TRAPEZOID
PIN BALANCE
PARALLELOGRAM
ROTATION
Cut-Off
15V
DEGAUSS
X-RAY
Protection
Circuit
COLOR TEMPERADURE
FACTORY RECALL
EXIT
15V
Vertical Blanking,
Brightness Control
E2PROM
(IC402)
I2C
6.3V
15V
H/V Sync Processor
( IC701 )
- 160V
TILT
Control
Circuit
Vout 1
Vout 2
15V
V-OUT
( IC601)
TDA4866
TDA4857
I2C
40V
H/V
Sync
Degaussing
Circuit
FBT
( T701 )
15V
80V
50V
15V
6.3V
H-OUT
( Q706)
SMPS
TRANS
(T901)
H-DRV
B+
400V
15V
Line
Filter
H-Linearity
Correction
Dynamic
Focus
Circuit
Auto
Beam
Limit
5V
Voltage
Regulating
Circuit
SMPS
CONTROL
(IC901)
DC/DC Converter
50V
DPM
STEP UP
B-DRV
CONTROL
CIRCUIT
POWER INPUT
100~240VAC
(50/60Hz)
D/D Feed Back
DESCRIPTION OF BLOCK DIAGRAM
1. Line Filter & Associated Circuit.
3) The Micom sets operating mode and offers the
controlled data. (H-size, H-position, V-size, ... etc.)
4) The controlled data of each mode is stored in itself.
5) User can adjust screen condition by each OSD
function. The data of the adjusted condition is stored
in EEPROM(IC402).
This is used for suppressing noise of power input line
flowing into the monitor and/or some noise generated in
this monitor flowing out through the power input line.
That is to say, this circuit prevents interference between
the monitor and other electric appliances.
2. Degauss Circuit & Coil.
7. Horizontal and Vertical Synchronous Processor.
The degauss circuit consists of the degaussing coil, the This circuit generates the horizontal drive pulse and the
PTC(Positive Temperature Coefficient) thermistor(TH901), vertical drive pulse by taking sync-signal from the Signal-
and the relay(RL901). This circuit eliminates abnormal Cable. This circuit consists of the TDA4857(IC701) and
color of the screen automatically by degaussing the the associated circuit.
shadow mask in the CRT during turning on the power
switch. When you need to degauss in using the monitor, 8. D/D(DC to DC) Converter.
select DEGAUSS on the OSD menu.
This circuit supplies DC voltage to the horizontal deflection
output circuit by increasing DC 50V which is the
secondary voltage of the SMPS in accordance with the
input horizontal sync signal.
3. SMPS(Switching Mode Power Supply).
This circuit is working of 90~264V AC(50/60Hz).
The operation procedure is as follows:
1) AC input voltage is rectified and smoothed by the bridge 9. Side-Pincushion & Trapezoid Correction Cirucit.
diodes (D900) and the capacitor (C908). This circuit improves the side-pincushion and the
2) The rectified voltage(DC) is applied to the primary coil trapezoid distortion of the screen by mixing parabola and
of the transformer(T901). saw-tooth wave to output of the horizontal deflection D/D
3) The control IC(IC901) generates switching pulse to turn converter which is used for the supply voltage(B + ) of the
on and off the primary coil of the transformer (T901) deflection circuit.
repeatedly.
4) Depending on turn ratio of the transformer, the
secondary voltages appear at the secondary coils of the
transformer(T901).
10. Horizontal Deflection Output Circuit.
This circuit makes the horizontal deflection by supplying
the saw-tooth current to the horizontal deflection yoke.
5) These secondary voltages are rectified by each
diode(D941, D942, D951, D961, D962, D971) and operate 11. High Voltage Output & FBT(Flyback Transformer).
other circuit. (horizontal and vertical deflection, video The high voltage output circuit is used for generating pulse
amplifier, ...etc.)
wave to the primary coil of the FBT(Flyback Transformer) .
A boosted voltage(about 25.5KV) appears at the
secondary of the FBT and it is supplied to the anode of the
CDT. And there are another output voltages such as the
dynamic focus and the screen voltage(G2).
4. Display Power Management Circuit.
This circuit control power consumption of the monitor by
detecting H and V sync signal. There are off mode. When no
horizontal or vertical sync signal input, the circuit consists of
Q941 and Q951 becomes off mode. It’s power consumption
is below 5W.
12. H-Linearity Correction Circuit.
This circuit corrects the horizontal linearity for each
horizontal sync frequency.
5. X-ray Protection.
If the high voltage of the FBT reaches up to 29kV (abnormal
state), IC401(MICOM) pin 35 Sensing from FBT directly.
Then MICOM control IC701 (Deflection controller) to stop
Horizontal drive pulse and stop Horizontal Deflection.
13. Vertical Output Circuit.
This circuit takes the vertical ramp wave from the
TDA4857(IC701) and performs the vertical deflection by
supplying the saw-tooth current from the TDA4866(IC601)
to the vertical deflection yoke.
6. Micom(Microprocessor) Circuit.
14. Dynamic Focus Output Circuit.
The operating procedure of Micom(Microprocessor) and
its associated circuit is as follows:
This circuit takes the horizontal and the vertical parabola
waves from the TDA4857(IC701) and amplifies it to
maintain constant focus on center and corners in the
screen.
1) H and V sync signal is supplied from the signal cable.
2) The Micom(IC401) distinguishes polarity and
frequency of H and V sync.
15. H& V Blanking and Brightness Control.
18. Video Pre-Amp Circuit.
Blanking circuit eliminates retrace line by supplying
negative pulse to the G1 of the CRT. And Brightness
circuit is used for control of the screen brightness.
This circuit amplifies the analog video signal from 0-0.7V
to 0-4V. It is operated by taking the clamp, R, G, B drive
and contrast signal from the Micom(IC401).
16. Image Rotation (Tilt) Circuit.
19. Video Output Amp Circuit.
This circuit corrects the tilt of the screen by supplying the
image rotation signal to the tilt coil which is attached near
the deflection yoke of the CRT.
This circuit amplifies the video signal which comes from
the video pre-amp circuit and amplified it to applied the
CRT cathode.
17. OSD Circuit
This circuit is used for performing the OSD(On-Screen-
Display) function.
When a user selects the OSD Select/Adjustment control,
the adjustment status displays on the screen.
ADJUSTMENT
GENERAL INFORMATION
7) Adjust tilt as arrow keys to be the best condition.
8) DIST. ADJ. → BALANCE command.
9) Adjust parallelogram as arrow keys to be the best
condition.
All adjustment are thoroughly checked and corrected
when the monitor leaves the factory, but sometimes
several adjustments may be required.
Adjustment should be following procedure and after
warming up for a minimum of 30 minutes.
10) Adjust balance of pin-balance as arrow keys to be
the best condition.
• Alignment appliances and tools.
- IBM compatible PC.
11) DIST. ADJ. → FOS. ADJ command.
12) Adjust V-SIZE as arrow keys to 234±2mm.
13) Adjust V-POSITION as arrow keys to center of the
screen.
- Programmable Signal Generator.
(eg. VG-819 made by Astrodesign Co.)
- EPROM or EEPROM with saved each mode data.
- Alignment Adaptor and Software.
- Digital Voltmeter.
14) Adjust H-SIZE as arrow keys to 312±2mm.
15) Adjust H-POSITION as arrow keys to center of the
screen.
- White Balance Meter.
16) Adjust S-PCC (Side-Pincushion) as arrow keys to be
the best condition.
- Luminance Meter.
- High-voltage Meter.
17) Adjust TRAPEZOID as arrow keys to be the best
condition.
AUTOMATIC AND MANUAL DEGAUSSING
The degaussing coil is mounted around the CDT so that
automatic degaussing when turn on the monitor. But a
monitor is moved or faced in a different direction, become
poor color purity cause of CDT magnetized, then press
DEGAUSS on the OSD menu.
18) Save of the Mode 1.
19) Display from Mode 1 to 8 and repeat above from
number 12) to 19)
20) PRESET EXIT → Y (Yes) command.
4. Adjustment for White Balance and Luminance.
1) Set the White Balance Meter.
ADJUSTMENT PROCEDURE & METHOD
-Install the cable for adjustment such as Figure 1and run
the alignment program on the DOS for IBM compatible PC.
-Set external Brightness and Contrast volume to max position.
2) Press the DEGAUSS on the OSD menu for
demagnetization of the CDT.
3) COLOR ADJ. → LUMINANCE command of the
alignment program.
+
1. Adjustment for B Voltage.
4) Set Brightness and Contrast to Max position.
5) Display color 0,0 pattern at Mode 8.
1) Display cross hatch pattern at Mode 8.
2) Check C999 (+) voltage to 50± 0.5Vdc.
6) COLOR ADJ.→ BIAS ADJ.→ COLOR No. → 1
command of the alignment program.
2. Adjustment for High-Voltage.
7) Check whether green color or not at R-BIAS and G-
BIAS to min position and B-BIAS to 127(7F) and
Sub-Brightness to 177(B1) position. Adjust G2
1) Display cross hatch pattern at Mode 8.
2) DIST.ADJ→CTRL PWM → High Voltage Command.
3) Adjust High Voltage to 25.5kV±0.3 kVdc.
(screen) command to 0.4
luminance.
±
0.05FL of the raster
4) Press Enter Key.
8) Adjust R-BIAS and G-BIAS command to x=0.283
0.005 and y=0.298
±
3. Adjustment for Factory Mode (Preset Mode).
1) Display cross hatch pattern at Mode 1.
2) Run alignment program for CQ771G on the IBM
compatible PC.
±
0.005 on the White Balance
Meter with PC arrow keys.
9) Adjust SUB-Brightness command to 0.5
raster luminance.
±
0.1FL of the
3) EEPROM → ALL CLEAR → Y(Yes) command.
<Caution> Do not run this procedure unless the
EEPROM is changed. All data in EEPROM (mode
data and color data) will be erased.
10) Adjust repeat number 8).
11) After push the “ENTER” key.
11-1) COMMAND → PRESET START → Y(Yes) command.
12) Display color 15,0 full white pattern at Mode 8.
13) DRIVE ADJ.→ No 1. command.
4) Power button of the monitor turn off → turn on.
5) COMMAND→PRESET START→Y(Yes) command.
6) DIST. ADJ. → CTRL PWM → TILT command.
14) Set Brightness is cut-off(0.06FL) and Contrast to
Max position.
5. Input EDID Data.
1) Display color 15,0 cross hatch pattern at Mode 8.
2) EEPROM → Write EDID command and confirm
“EDID Write OK!!” message of monitor.
3) Exit from the alignment program.
15) Set SUB-CONTRAST Max 127(7F) (decimal) position.
16) Set B-DRIVE to 90(5A); LG CDT at DRIVE of the
alignment program. (TECO CDT: B-DRIVE 100(64))
17-1) Adjust R-DRIVE and G-DRIVE command to white
4) Power switch OFF/ON for EDID data save.
balance x=0.283±0.003 and y=0.298±0.003 at Full-
6. Adjustment for Focus.
White on the White Balance Meter with PC arrow keys.
17-2) Display color 15,0 window pattern 5Box 50x50mm at
mode 8.
1) Set the Brightness and Contrast to max position.
2) Display cross hatch with quadrant text pattern in full
screen at Mode 8.
3) Adjust two Focus control on the FBT that focus
should be the best condition.
18) Adjust SUB-CONTRAST command to 50
B/Raster 0.06FL.
±1FL at
19) Display color 15,0 full white patten at Mode 8.
20) Set Brightness and Contrast to Max position.
21) COLOR ADJ. → LUMINANCE → ABL command.
22) Adjust ABL to 33 1FL of the luminance at B/Raster 0.06FL.
±
23) After push the “ENTER” key, and “COMMAND →
PRESET EXIT → Y(Yes)” command.
24) Exit from the program.
TROUBLESHOOTING GUIDE
1. NO POWER
NO POWER
(POWER INDICATOR OFF)
NO
CHECK
FUSE OK?
TROUBLE IN FUSE
(F901)
YES
CHECK
C908 VOLTAGE?
(AC120V: 160VDC,
AC220V: 304VDC)
NO
TROUBLE IN
D900
YES
CHECK
IC901 PIN 6
NO
TROUBLE IN
IC901
WAVEFORM
(SQUARE WAVE
COMES OUT?)
YES
CHECK
D941, D942, D951, D961,
D962, D971
TROUBLE IN
D941, D942, D951,
D961, D962, D971
NO
VOLTAGE?
YES
TROUBLE IN
Q903, Q952,
Q951, Q942, Q941
2. NO CHARACTER
NO CHARACTER
CHECK
IC302
PIN 9(5V) ?
TROUBLE IN
P302 5V LINE
NO
YES
TROUBLE IN
PC SIGNAL,
P301 SIGNAL CABLE
CHECK
IC302 PIN 5, 6, 7?
NO
NO
YES
CHECK
IC302 PIN 20, 19, 18 ?
TROUBLE IN
IC302
YES
CHECK
IC303 PIN 4 (80V)
PIN 8 (12V) ?
TROUBLE IN
P303 12V LINE/
80V LINE
NO
YES
CHECK
IC303
PIN 1, 2, 3 ?
NO
NO
TROUBLE IN IC303
YES
TROUBLE IN
R341~R343,
R331~R333, L311~L313,
D307~D312
CHECK
R, G, B CATHODE
VOLTAGE?
YES
TROUBLE IN
CRT SOCKET
3. NO RASTER
NO VIDEO
(POWER INDICATOR ON)
CHECK
POWER INDICATOR
GREEN or AMBER?
AMBER
DPM MODE
(NO H and/or V SYNC)
GREEN
CHECK
D712 ANODE
(-157V)?
NO
TROUBLE IN
D712
YES
CHECK
G1 VOLTAGE?
(-55V~-150V)
TROUBLE IN
Q799
NO
YES
CHECK
CDT HEAT
VOLTAGE? (6.3V)
TROUBLE IN
D941, Q942, Q941
NO
YES
TROUBLE IN
CDT
4. NO HORIZONTAL DEFLECTION
NO H-DEFLECTION
(ONE VERTICAL LINE)
NO
TROUBLE IN
Q706
CHECK
Q706?
YES
CHECK
B VOLTAGE
NO
TROUBLE IN
50V LINE
+
(50V)?
YES
CHECK
T701(FBT) PIN 2
(31KHZ 60V,
69KHZ 140V) ?
NO
TROUBLE IN
Q719, Q720, D710
YES
CHECK
Q701 COLLECTOR
WAVEFORM?
TROUBLE IN
Q701
NO
YES
0V
T
TROUBLE IN
T701, P701
5. TROUBLE IN H-LINEARITY
UNBALANCED OF H-LIN.
CHECK
IC401
PIN 5, 6, 7 ?
NO
TROUBLE IN
IC401 (MICOM)
YES
CHECK
Q711~Q716?
NO
TROUBLE IN
Q711 ~ Q716
YES
CHECK
L703?
NO
TROUBLE IN
L703
Cs SIGNAL TABLE
YES
HORIZONTAL
FREQUENCY(fH)
Cs1
Cs2
Cs3
Cs0
30K ~ 33.9K
34K ~ 38.9K
39K ~ 43.9K
44K ~ 47.9K
48K ~ 51.9K
52K ~ 57.9K
58K ~ 61.9K
62K ~ 65.9K
66K ~ 70K
L
L
L
H
L
L
L
255
155
130
100
85
TROUBLE IN
C722, C723, C726, C729
H
H
H
H
H
H
H
L
L
H
H
L
L
H
H
H
H
70
L
60
H
H
60
30
6. NO VERTICAL DEFLECTION
NO V-DEFLECTION
(ONE HORIZONTAL LINE)
CHECK
IC601 PIN 3
(15V)?
NO
TROUBLE IN
R603 15V LINE
YES
TROUBLE IN
CHECK
IC601 PIN 7
(40V)?
NO
HIGH-VOLTAGE OUT
CIRCUIT(FBT),
D721, R606
YES
CHECK
IC701 PIN 12, 13?
NO
TROUBLE IN
IC701
3V
YES
TROUBLE IN
IC601, V-CIRCUIT
7. TROUBLE IN OSD
(ENTER BUTTON MUST BE PRESSED.)
NO OSD
CHECK
NO
TROUBLE IN
5V LINE
+
IC301 B
(5V)
?
DC 5V
YES
CHECK
IC301 PIN 5, 10
WAVEFORM?
TROUBLE IN
IC601 PIN8 (V-FBP),
T701 40V LINE (H-FBP)
NO
Pin 10
Pin 5
5V
YES
CHECK
IC301 PIN 12
WAVEFORM ?
TROUBLE IN
IC302, IC301
NO
H+V
5V
YES
CHECK
IC301 PIN 13, 14, 15 ?
NO
TROUBLE IN
IC301, IC302
H+V
5V
YES
TROUBLE IN
OSD PERIPHERAL
CIRCUIT
8. TROUBLE IN DPM
(NO OFF MODE.)
OFF MODE FAILURE
CHECK
IC401 (MICOM)
PIN 31, 32 (H/V INPUT)
SIGNAL?
CHECK PC,
(PC IS NOT GOING INTO
DPM OFF MODE)
NO
INPUT H/V SYNC SIGNAL
YES
H/V SYNC
CHECK
IC401 PIN 13
WAVEFORM?
NO
TROUBLE IN
X401
5V
YES
24MHz
CHECK
IC401 (MICOM)
PIN 2, 3 ?
NO
(DPMF: 0V)
TROUBLE IN
IC401 (MICOM)
SEE DPM TABLE
YES
CHECK
B LINE
+
NO
TROUBLE IN
(6.3V,15V, 80V) ?
Q941, Q942, Q951, Q952,
YES
DPM TABLE
Item
LED
DPMF
Mode
NORMAL
TROUBLE IN PC
GREEN
AMBER
AMBER
AMBER
H
L
L
L
STAND-BY
SUSPEND
OFF
9. NO DEGAUSSING
NO DEGAUSSING
(DEGAUSS ON THE OSD MENU MUST BE PRESSED.)
CHECK
IC401 PIN 19
(0V)?
NO
NO
NO
TROUBLE IN
IC401 (MICOM)
YES
CHECK
Q953 COLLECTOR
VOLTAGE?
TROUBLE IN
Q953
DC 15V
YES
CHECK
P902 ?
TROUBLE IN
P902
YES
NO
CHECK
RL901?
TROUBLE IN
RL901
YES
TROUBLE IN
TH901,
DEGAUSSING COIL
10. NO TILT (NO ROTATION)
NO TILT (NO ROTATION)
CHECK
IC401 PIN21
WAVE FORM ?
TROUBLE IN
IC401 (MICOM)
NO
YES
CHECK
15V LINE
NO
TROUBLE IN
15V LINE, 6.3V LINE
AND 6.3V LINE ?
YES
CHECK
Q503 EMITTER
VOLTAGE ?
NO
TROUBLE IN
Q501~Q503
YES
TROUBLE IN
P501, TILT COIL, D521
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