5. Troubleshooting (continued)
5.3.4 Abnormal screen for VGA source:
OK
NG
Failure Point
1) No R, G, B video signals output from
host computer, check computer.
2) VGA video signal cable disconnection.
Failure Point
In the case of the Red signal. (Green and Blue
signal is the same path, too.)
1) Printed wire broke between CN302 pin 1 and
I306 pin 13.
2) Video cable is failure.
3) R313, L304, R314 are open.
4) R315 is short.
5) C316, C318 is short or open.
NG
OK
Failure Point
1) Printed wire broke between I306 and CN304.
2) LVDS wire failure.
NG
OK
Process "Checking the resolution change IC
movement" section.
NG
OK
Failure Point
1) Printed wire broke between I306 and CN302.
2) L307, R324, R325 are open.
3) R326, R327 if is 2.2K ohm.
4) D306, D307, C324, C325 are short.
5) Video cable is failure.
Check the R, G, B video
signal from computer input on CN302
of video connector.
Check the R, G, B input
video signals on I306 pin 8, 10, 13
respectively that their level is 0.5 to 1.0
Vp-p.
Check the H, V SYNC input signals on
I306 pin 16, 17 respectively that signal
and level.
Check all LVDS signals being output
to CN304 from I306?
50
ACER A211H/A221HQ
