ViewSonic VA1930wm-1 Service Manual page 44

3.
DC output voltage is unstable
Unstable power
Check sampling
Circuit
Check the R pin
voltage of IC803
about 2.5V
Check pin2 of
IC802 voltage
is 3V
Check pin1 of
IC802 voltage
below 1V
ViewSonic Corporation
Check R822,
R823, R824
Check the C
pin voltage of
IC803 if 3V
Check R819, R820
Check R818, D804,
Change R808, R 809,
R810, R 811, R815,
END
Confidential - Do Not Copy
41
Change R822,
R823, R824
C807 if short
Change
R818, D804,
Change
IC803
VA1930wm-1