LG PE/PL-43 Service Manual page 24

8.NO RASTER
Is the voltage
at Pin 76,69 of IC501 5V ?
Does the square
waveform from Pin 17
of IC702 appear?
No
Check / Replace
IC702
Is the waveform at
collector Q402 normal?
No
Check / Replace
Q402,T401
Is the waveform at
collector Q403 normal?
No
Check / Replace
Q403
Check / Replace
T401
Check +B voltage
115V or not
OK
No
Check 5V,9V,
Yes
12V lines
Yes
Check IIC bus lines
(SDA,SCL)
Yes
Yes
Yes
0V
Check F801
Check the voltage
of C812(+)
Check the voltage
at pin 4 of IC801
Check/Replace IC887,IC871
Check the 2nd voltage are
short or not
- 24 -
Open
OK
Check / Replace
F801,D815
IC801
0V
Check / Replace
D815
Lower than 6V
Check / Replace
D805,Q801
6~8 V
ZD801