Output Power Is Unstable - ViewSonic VS11661 Service Manual

Output power is unstable

Unstable power
Check sampling
Check the R pin
voltage of IC803
about 2.5V
ViewSonic Corporation
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Circuit
Check pin2 of
IC802 voltage is
3V
Check pin1 of
IC802 voltage
below 1V
END
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Check R822,
R823, R824
Check the C pin
voltage of IC803
if 3V
Check R819, R820
Check R818, D804, C807
if short
Change R818,
D804, C807
Change R808, R 809,
R810, R 811, R815,
R814,Q803
48
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Change R822, R823,
R824
Change
IC803
VX2255wmh-4
VX2255wmb-4