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Check the DVI video signal from computer input
on P303 of DVI connector.
OK
NG
Failure Point
1) No DVI video signals output from host
computer, check computer.
2) DVI Video signal cable disconnection.
Check the DVI input video signals on I308 pin
12,13,14,15,16,17,18,19 respectively that
differential input voltage is 150 to 1200mV, and
input commond mode voltage is 3.3V.
Failure Point
In the case of the DVI_RX0+/- signal. (A
DVI_RX1+/-, DVI_RX2+/- and DVI_RXC+/-
signal is the same path, too.)
1)Printed wire broke between P303 pin 17, 18 and
I308 pin 12. 13.
2) Video cable is failure.
3) R350, R355 open.
NG
OK
Check all LVDS signals being output to P307
from I308?
Failure Point
Printed wire broke between I308 and P303.
NG
OK
Proceed "Checking the resolution change IC
movement" section.
5.5 Abnormal screen (For DVI and the same for HDMI)
Go to cover page
28
5. Troubleshooting (continued)
ACER H233H