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Check the R, G, B video signal from computer
input on P302 of D-sub 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 I308
pin25, 27, 30 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
I308 pin30.
2) Video cable is failure.
3) FB315,FB306,R327,C315 is open.
4) R326,C329 is short or open.
NG
OK
Check all LVDS signals being output to P307
from I308?
Failure Point
Printed wire broke between I308 and P307.
NG
OK
Proceed "Checking the resolution change IC
movement" section.
5.4 Abnormal screen for VGA
27
Go to cover page
5. Troubleshooting (continued)
ACER H233H