Technical information

33
2.3 Output power is unstable
Change R801,
R805, R822,
R823, R817
Change
D806,
C815
Check
R809, R808,
R814, D809
Change IC803
Change R810,
R811, R818
Check pin3 of
IC802 voltage
about 1V
Check R810,
R811,R818
Check the C pin
voltage of IC803
if 3V
Check the R pin
voltage of IC803
about 2.5V
Check D806,
C815 if short
Check pin1 of
IC802 voltage is
5.8V
Check
sampling
Circuit
END
Unstable power
YES
YES
YES
YES
YES
NO
NO
NO NO
NO
NO
2.4 Backlight can’t be turned on