Service manual

6.1 No power.
Check that CN251 pin1, 2 are approximately 12V
Check that FB251, FB252, F251 are 12V
Failure point
1. Power board failure.
2. Disconnected between CN251 and power board.
Check that C255 positive is at 5V.
Failure point
FB251, FB251, F251 failure
Failure point
P251, IC251, L251 failure
Check:
1. C262 is O/P 2.5V.
2. IC253 is O/P 3.3V.
Yes
Yes
Yes
No
No
No
6. Trouble Shooting Flow Chart
23
ViewSonic Corporation Confidential
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Do Not Copy VG910s/b