Appendix 4: Troubleshooting
Abnormal Screen: Abnormal screen for VGA source
Check the R.G.B video signals from
computer input on P302 of video connector
Failure Point:
1. No R.G.B video signals output from host computer. Check the computer.
2. VGA video signal cable disconnected
Check VGA R.G.B input
video signals on I306 pin99, pin96, pin93
respectively that their level is
0.5Vp-p to 0.7Vp-p
NG
OK
Failure Point:
In the case of the RED signal. (Green and Blue signals are the same path, too.)
1. Printed wire broke between I302 pin1, pin2, pin3 and I306 pin93, pin96, pin99.
2. Video cable is failure.
3. l306 is damaged.
4.FB305, FB307, FB309, FB308, FB306, FB310,
R310~R318, C317~C320, C324,C325 is Open
5.R313, R314, R315 is short.
NG
OK
Check all LVDS signals being output
to P306 from I306?
NG
Proceed ‘Checking the resolution changed IC
movement’ section
OK
Failure Point:
Printed wire is open between I306 and P306.
6
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ACER AL2002W
