ViewSonic VA2016W Service Manual - Page 57

ViewSonic Corporation, 4. Output power is unstable, Check R822, R823, Change R822, D804, C807 if short

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6.4. Output power is unstable Unstable power Check sampling Circuit Check the R pin voltage of IC803 Check pin2 of IC802 Check R822, R823, R824 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, Check pin1 of IC802 voltage b l 1V Change R808, R 809, R810, R 811, R815, END ViewSonic Corporation 54 Confidential - Do Not Copy VA2016w-2

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54
ViewSonic Corporation
Confidential - Do Not Copy
VA2016w-2
6.4. Output power is unstable
Unstable power
Check sampling
Circuit
Check R822,
R823, R824
Change R822,
R823, R824
Check the R pin
voltage of IC803
Check R819, R820
Check R818, D804,
C807 if short
Change
R818,
D804,
Check pin2
of IC802
Check pin1 of
IC802 voltage
bl
1V
Change R808, R
809, R810, R 811,
R815,
END
Check the C
pin voltage of
IC803 if 3V
Change
IC803