Acer A221HQV Service Manual page 41

5.2.4.2 Abnormal screen for DVI source
Check the TMDS signals
from computer input on CN303 of
video connector.
OK
Check the DVI signal to
CN303 pin 16 respectively that voltage
is 4.5 to 5 V.
OK
Check TMDS signals on
I310 pin 12,13,14,15,16,17,18,19
respectively that their differential input
voltage is 150 to 1200 mV.
OK
Check all LVDS signals being output
to CN306 from I310?
OK
Proceed "Checking the resolution change IC
movement" section.
5. Troubleshooting (continued)
Failure Point
NG
1) No TMDS signals output from host computer,
check computer.
2) DVI-D video signal cable disconnection.
Failure Point
The DVI is high will to generated TMDS from PC
host.
1) Check CN303 pin 14 if is 4.75 to 5V.
2) Printed wire broke between CN303 pin 14
NG
and Pin16.
3) C341 is short, or R342 is open.
5) DVI-D cable is failure.
6) Printed wire broke between CN303 pin 16
and I310 pin 111.
7) I310 is failure.
Failure Point
In the case of the RX2+/- signal. (A RX1, 0, and
RXC signal is the same path, too.)
NG
1) Printed wire broke between CN303 pin 1, 2
and I310 pin 16, 17.
2) DVI-D cable is failure.
3) R349, R350 is open.
Failure Point
NG
1) Printed wire broke between I310 and CN306.
2) LVDS cable failure.
ACER A211H/A221HQ 39
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