Acer A221HQV - Abnormal Plug and Play Operation (for DVI and the same for HDMI)

5.1.6 Abnormal plug and play operation (For DVI and the same for HDMI):
5. Troubleshooting (continued)
Confirm the host computersupplies
DDC2B mode.
OK
NG
Failure Point
The host machine is not
communicatiog in DDC2B mode.
OK
Check the output signal of serial data /
clock on I308 pin 122,121
OK
NG
Failure Point
I308 is failure.
Check the voltage on P303 pin14 that is
power DC 5 V.
OK
NG
Failure Point
The Video cable is failure.
Check the voltage on P303 pin 7, 6 that
is serial data / clock signal.
OK
NG
Failure Point
The Video cable is failure.
Failure Point
1) Printed wire broke between I308 pin122,
121,R344, R345 and P303 pin7,6
2) I308 maybe failure.
3) R410, R414 is open.
4) D320 or D321 or C339 or C342 is
shorted.
Check the voltage on P303 pin 16 that is
4.5V.
NG
Failure Point
Printed wire broke between P303 pin
14 and pin 16.
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ACER A211H/A221HQ