ViewSonic VA1930wm-1 - Page 44

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