Acer P221W, Service Manual

Page: 22 / 37

Acer Service Manual
2. Unstable Power
C hange R 801,
R 805, R 822,
R 823, R 817
C hange
D 806,
C 815
C heck
R 809, R 808,
R 814, D 809
C hange IC 803
C hange R 810,
R 811, R 818
C heck pin3 of
IC 802 voltage
about 1V
C heck R 810,
R 811,R 818
C heck the C pin
voltage of IC 803
if 3V
C heck the R pin
voltage of IC 803
about 2.5V
C heck D 806,
C 815 if short
C heck pin1 of
IC 802 voltage is
5.8V
C heck
sam pling
C ircuit
END
U nstable pow er
Y ES
Y ES
Y ES
Y ES
Y ES
NO
NO
NO NO
NO
NO
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