Acer AL1716x Service Manual - Page 33
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Output Voltage
Unstable
Check Vbe of 801
below 0.3V
YES
Check reference
voltage
YES
Check feedback
circuit
YES
END
NG
Check circuit if short
YES
Check Q801,
NG
Check pinR of IC801
YES
Check R810,
NG
Check Vpin3-4 of
IC801 about 6V
Check Vpin1-2 of IC801
Check
R809, R814
NG
YES
Q802
NG
YES
R811
NG
YES
about 1V
YES
33
Check ZD801,
ZD802, ZD803,
D803, D805
Check R809,
R814, IC801,
R818
Check C815,
D806, R812