Acer A221HQV - Page 54

5. Troubleshooting (continued)
5.3.6 Abnormal plug and play operation for VGA:
OK
NG
Failure Point
The host machine is not communicated in DDC/
CI mode.
OK
NG
Failure Point
1) Printed wire broke between I303 pin 8, D308
and CN302 pin 9.
2) D308 is failure.
OK
NG
Failure Point
I303 is failure.
OK
NG
Failure Point
The VGA video cable is failure.
OK
NG
Failure Point
The VGA video cable is failure.
Failure Point
1) Printed wire broke between I306 pin 18, 19,
I303 pin 5, 6 and CN302 pin 12, 15.
2) I306 maybe failure.
3) R331 or R332 is open.
4) C328, C329, D310, D311 is short.
Confirm the host computer supplies
DDC/CI mode.
Check the voltage on CN302 pin 9,
that is DC 5 V.
Check the voltage on I303 pin 8,
that is DC 5 V.
Check the signals if is high
level on CN302 pin 12, 15, that is I2C
data / clk signal.
Check the output signal of I2C
data / clk on I303 pin 5, 6.
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ACER A211H/A221HQ