ViewSonic VA2016W Service Manual - Page 56

ViewSonic Corporation, 3. DC output voltage is unstable, Check R818, D804, C807 if

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6.3. DC output voltage is unstable Unstable power Check sampling Circuit Check R822, R823, R824 Check the R pin voltage of IC803 about 2.5V Check pin2 of IC802 voltage is 3V Check the C pin voltage of IC803 if 3V Change R822, R823, R824 Change IC803 Check R819, R820 Check R818, D804, C807 if short Change R818, D804, C807 Check pin1 of IC802 voltage below 1V Change R808, R 809, R810, R 811, R815, END ViewSonic Corporation 53 Confidential - Do Not Copy VA2016w-2

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53
ViewSonic Corporation
Confidential - Do Not Copy
VA2016w-2
6.3. 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 2.5V
Check R819, R820
Check R818, D804, C807 if
short
Change R818,
D804, C807
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