Samsung 720N - Black Screen and Backlight Turn on

4 Troubleshooting
4-6
4-6 Black Screen and backlight turn on
Black Screen
Check power
supply: Pin1, 2 of
CN101
Power Fail
No
Check pin34, 51,
66, and 82 Of
U105
Check FB103 And U102
No
Yes
Check pin32, 49,
56, and 75 Of
U105
Check FB106 And U101
No
Yes
Check Reset
(pin84) Of U105
Check C144, R172
No
Yes
Check Crystal:
Pin96, Pin97 Of
U105
Check: X101, C153,
C154
Inverter Fail
MCU Fail
Check R167, Q106,
R108, R110
No
Yes
Check CCFL-
Enable (pin85) of
U105
Check pin5 of
CN101
Yes
No
No
Yes
Yes