Acer NA23WABAS Service Manual page 44

5.4 Abnormal screen for VGA
pin22, 24, 26 respectively that their level is 0.0 to
5. Troubleshooting (continued)
Check the R, G, B video signal from computer
input on P303 of D-sub connector.
NG
OK
Check the R, G, B input video signals on I312
0.7Vp-p.
NG
OK
Check all LVDS signals being output to P305
from I312?
NG
OK
Proceed "Checking the resolution change IC
movement" section.
Failure Point
1) No R, G, B video signals output from host
computer, check computer.
2) Video signal cable disconnection.
Failure Point
In the case of the Red signal. (A Green and Blue
signal is the same path, too.)
1) Printed wire broke between P303 pin1 and
I312 pin26.
2) Video cable is failure.
3) FB305,B338,C321 is open.
4) R339 is short or open.
Failure Point
Printed wire broke between I312 and P305.
43
ACER V233H
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