Acer NA23WABAS Service Manual page 32

5.4 Abnormal screen for VGA
pin24, 22, 19 respectively that their level is 0.0 to
5. Troubleshooting (continued)
Check the R, G, B video signal from computer
input on P302 of D-sub connector.
NG
OK
Check the R, G, B input video signals on I307
0.7Vp-p.
NG
OK
Check all LVDS signals being output to P304
from I307?
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 P302 pin1 and
I307 pin24.
2) Video cable is failure.
3) FB304,B309,C315 is open.
Failure Point
Printed wire broke between I307 and P304.
31
ACER V233H
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