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