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Acer
4.3 DC output voltage is unstable
Output voltage unstable
Check Vbe of
Q801below 0.3V
Check
reference
Check feedback
circuit
END
Checkcircu
it if
Check Q801, Q802
Check Pin R of
IC803 voltage
about 2.5V
Check R822,
R823.R825
Check
Vpin2.4of IC801
about 1V
Check Vpin6 of
IC801have output
Change IC
55
Acer –LCD-BV193HQ
Check ZD801,
D803, D805
Check R832,, IC801,
CheckR815, c814,
R816
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