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5. Troubleshooting (continued)
5.4 Abnormal screen for VGA
Check the R, G, B video signal from computer
input on P302 of video connector.
OK
NG
Failure Point
1) No R, G, B video signals output from host
computer, check computer.
2) Video signal cable disconnection.
Check the R, G, B input video signals on I305
pin12, 14, 16 respectively that their level is 0.0 to
0.7Vp-p.
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
I305 pin16.
2) Video cable is failure.
3) FB302,FB306,R327 isopen.
4) R326 is short or open.
5) C315 is short or open.
NG
OK
Check all LVDS signals being output to P305
from I305?
Failure Point
Printed wire broke between I305 and P305.
NG
OK
Prpcess "Checking the resolution change IC
movement" section.
23
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ACER X193HQ