Acer V173 Service Manual page 45

2. DC output voltage is unstable
Output voltage unstable
Check Vbe of
Q801below 0.3V
Check reference
voltage
Check feedback
circuit
END
Check circuit
if short
Check Q801,Q802
Check Pin R of
IC803 voltage
about 2.5V
Check R822, R823
Check vpin2-4of
IC801 about1V
Check Vpin6 of
output
IC801 have
Change IC
44
Check ZD801, D803,
D805
Check R832,, IC801,
Check R815, c814,
R816