ViewSonic VS11354 Service Manual page 41

3. DC output voltage is unstable
ViewSonic Corporation
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
Check R822,
R823, R824
Check the C pin
voltage of IC803
if 3V
Check R819, R820
Check R818, D804, C807
Change R808, R 809,
R810, R 811, R815,
END
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38
Change R822,
R823, R824
Change
IC803
if short
Change
R818, D804,
VG1921wm-2