LG L192WS-BNQ Service Manual page 19

Black Screen
Check power supply:
Pin1, 2 of CN101
OK
Check pin34, 51, 66, and 82
Of U105
OK
Check pin32, 49, 56, and 75
Of U105
OK
Check Reset (pin84)
Of U105
OK
Check Crystal: Pin96,
Pin97 Of U105
OK
Check CCFL - Enable
(pin85) of U105
NG
MCU (imbedded in
Scaler IC) Fail
5.Black Screen and backlight turn on
NG
NG
NG
NG
NG
OK
Check pin5 of
CN101
19
Power Fail
Check FB103
And U102
Check FB106
And U101
Check C144, R172
Check: X101,
C153, C154
OK
Inverter Fail
NG
Check R167, Q106
R108, R110