5.1.4 Abnormal screen( for VGA):
5. Troubleshooting (continued)
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, C315 is open.
4) R327 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.
25
ACER A211H/A221HQ
