ViewSonic VP231wb

6. Trouble Shooting Flow Chart
6.1 No power.
Check that CN251 pin1, are approximately 24V
Check that C281 are 24V
Failure point
1. Adaptor failure.
2. Disconnected between CN251 and Adaptor.
Check that C262 positive is at 5V.
Failure point
FB251, FB251 failure
Failure point
D251, IC251, L251, Q255 failure
Check:
1. IC255 is O/P 3.3V.
2. IC253 is O/P 1.8V.
3. IC256 is O/P 2.5V.
4. IC252 is O/P 3.3V.
Yes
Yes
Yes
No
No
No
Failure point
IC255, IC253, IC252, IC256
No
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Do Not Copy VP231wb
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