LG L1718S-BN - - 17" LCD Monitor Service Manual page 19

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