LG L192WS-BNQ - TROUBLESHOOTING BLACK SCREEN; Black Screen and Backlight On

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5.Black Screen and backlight turn on
Black Screen
Power Fail
Check power supply:
Pin1, 2 of CN101
Check pin34, 51, 66, and 82
Of U105
Check Crystal: Pin96,
Pin97
Of U105
Check CCFL
-
Enable
(pin85) of U105
MCU (imbedded in
Scaler IC) Fail
Check FB103
Check: X101,
C153, C154
Inverter Fail
OK
NG
NG
OK
OK
NG
Check Reset (pin84)
Of U105
Check pin5 of
CN101
Check R167, Q106
R108, R110
Check C144, R172
OK
NG
NG
NG
OK OK
Check pin32, 49, 56, and 75
Of U105
NG
OK
And U102
Check FB106
And U101