Output Power Is Unstable - ViewSonic VA702-1 Service Manual

4. Output power is unstable

Unstable power
Check sampling
Check the R pin
voltage of IC803
about 2.5V
Check pin3 of
IC802 voltage
about 1V
ViewSonic Corporation
Circuit
Check pin1 of
IC802 voltage
is 5.8V
Check R810,
R811, R818
Check the C pin
voltage of IC803
if 3V
Check R809, R808, R814,
D809
Check D806, C815 if
Change R801, R805,
R822, R823, R817
END
Confidential - Do Not Copy
37
Change R810, R811,
R818
short
Change
D806, C815
VA702-1_VA702b-1
Change
IC803