ViewSonic VG910S - 19" LCD Monitor Service Manual page 28

6.3 No display on screen (LED is green).
Is the backlight lit?
Yes
Check that the cable is
fully connected to CN401
Yes
Check:
1. C262 is O/P 2.V.
2. IC253 is O/P 3.3V.
Yes
Check C255 is O/P 5V.
No
IC251. D251 failure
ViewSonic Corporation
Failure point
No
The cable is disconnected
No
Failure point
1. D252, D253 failure.
2. IC253 failure.
No
Check that the cable is fully
connected between the inverter
and interface board.
Yes
Check CN302 pin8 is 12V,
pin3 is 5V
Yes
Inverter failure
Confidential - Do Not Copy
25
No
Failure point
The cable is disconnected
No
1. Check Q309, Q310.
2. Check FB315, FB316
VG910s/b