Samsung 720N - Output Power Is Unstable

4 Troubleshooting
4-4
4-4 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 pin3 of
IC802 voltage
about 1V
Check D806, C815
if short
Check the C pin
voltage of IC803 if
3V
Check R810, R811,
R818
Unstable power
Change R810, R811,
R818
Change IC803
Check R809, R808,
R814, D809
END
Change D806, C815
Change R801, R805,
R822, R823, R817