Acer V173 - Page 45

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