5.4 Abnormal screen for VGA
5. Troubleshooting (continued)
OK
NG
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 I306 pin23.
2) Video cable is failure.
3) FB303,FB304, R309 is open.
4) R311 is short or open.
5) C315 is short or open.
NG
OK
Failure Point
Printed wire broke between I305 and P304.
NG
OK
Check the R, G, B video
signal from computer input on
P302 of video connector.
Check the R, G, B input video
signals on I305 pin18, 20, 23
respectively that their level is 0.0
to 0.7Vp-p.
Check all LVDS signals
being output to P304 from
I305?
Process "Checking the
resolution change IC
movement" section.
Go to cover page
24
ACER X223W
