Compaq Computer Monitor MV7500 User Manual

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. Its 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.ADJCTRL 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 ENTERkey.  
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) COMMANDPRESET STARTY(Yes) command.  
6) DIST. ADJ. CTRL PWM TILT command.  
- 10 -  
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 ENTERkey, 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  
- 14 -  
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  
- 16 -  
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  
- 17 -  
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  
- 19 -  
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