ViewSonic VS11444 Service Manual page 51

6.4. Output power is unstable
Unstable power
Check sampling
Circuit
Check the R pin
voltage of IC803
about 2.5V
Check pin1 of
IC802 voltage
is 5.8V
Check pin3 of
IC802 voltage
about 1V
ViewSonic Corporation
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
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48
Change R810, R811,
R818
short
Change
D806, C815
Change
IC803
VX1945wm-3