No Power On - ViewSonic VX800-3 - 18" LCD Monitor Service Manual

4.4 No Power On

Check that CN100 Pin1 is approximately 12V
YES
Check that F100 output is
12V
YES
Check that FB100, FB101
Is 12V
YES
Check that IC100
pin 2 is about 5V
NO
Failure point
1.L200 failure
2.D200 failure
3.IC100 failure
ViewSonic Corporation
NO
Failure point
1. Power Board failure
2. Disconnected between CN100 and power board
NO
Failure point
F100 failure
NO
Failure point
FB100, FB101 failure
Confidential – Do Not Copy
VX800-3