ViewSonic VX924 Service Manual page 53

2. Monitor cannot power on
ViewSonic Corporation
Change adaptor
Repair open / short
Change X1 / X2
Change failed part
Fix power supply circuit
Can not power on monitor
NO
Check adaptor
OK
NO
Check K/B
Open / short?
OK
NO
Check crystal X1 / X2?
OK
NO
Check CN 6, R79
Pin 40 of U6?
OK
Check power supply
NO
(12V, 5V, 2.5V & 3.3V)
OK
Change M/B
Confidential - Do Not Copy
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VX924