Output Power Is Unstable; Backlight Can't Be Turned On - Acer AL1716 Service Manual

2.3 Output power is unstable

Unstable power
Check
sampling
Circuit
YES
Check the R pin
voltage of IC803
about 2.5V
YES
Check pin1 of
IC802 voltage is
5.8V
YES
Check pin3 of
IC802 voltage
about 1V
YES
END

2.4 Backlight can't be turned on

NO
Check R810,
R811,R818
NO
Check the C pin
voltage of IC803
if 3V
YES
Check
R809, R808,
R814, D809
NO
Check D806,
C815 if short
Change
D806,
C815
NO
Change R801,
R805, R822,
R823, R817
NO
Change R810,
R811, R818
NO
Change IC803
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