Samsung 920NW - SyncMaster - 19" LCD Monitor

4 Troubleshooting
4-5
4-5 Black Screen and backlight turn on
Black Screen
Check power
supply: Pin1, 2 of
CN102
Power Fail
No
Check pin34, 51,
66, and 82 Of
U105
Check FB103 And U102
No
Yes
Check pin12, 68,
97 and 117 Of
U103
Check FB105 And U106
No
Yes
Check Reset
(pin19) Of U103
Check C149, R157
No
Yes
Check Crystal:
Pin32, Pin33 Of
U103
Check: X1, C147, C148
Inverter Fail
MCU Fail
Check R127, Q101,
R125, R126
No
Yes
Check CCFL-
Enable (pin20) of
U103
Check pin5 of
CN102
Yes
No
No
Yes
Yes