LG PE-43A82T, Service Manual

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