Samsung 920NW Service Manual - Page 20
Output power is unstable, Change R822, R823
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UPC - 729507800905
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4-3 Output power is unstable Unstable power 4 Troubleshooting Check sampling Circuit Check the R pin voltage of IC803 about 2.5V Check R822, R823, R824 Check the C pin voltage of IC803 if 3V Change R822, R823, R824 Change IC803 Check pin1 of IC802 voltage is 5.8V Check R819, R820 Check R818, D804, C807 if short Change R818 Check pin1 of IC802 voltage about 3V Change R808, R809, R810, R811 END 4-3
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4 Troubleshooting
4-3
4-3
Output power is unstable
Check sampling
Circuit
Check the R pin
voltage of IC803
about 2.5V
Check pin1 of
IC802 voltage
is
5.8V
Check pin1 of
IC802 voltage
about 3V
Check R818, D804,
C807 if short
Check the C pin
voltage of IC803 if
3V
Check R822, R823,
R824
Unstable power
Change R822, R823,
R824
Change IC803
Check R819, R820
END
Change R818
Change R808, R809,
R810, R811