Abnormal Plug And Play Operation For Vga - Acer A221HQV Service Manual

5.2.6 Abnormal plug and play operation

5.2.6.1 Abnormal plug and play operation for VGA

Confirm the host computer supplies
DDC/CI mode.
Check the voltage on CN302 pin 9,
that is DC 5 V.
Check the voltage on I304 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 I304 pin 5, 6.
Failure Point
1) Printed wire broke between I310 pin 58, 59,
I304 pin 5, 6 and CN302 pin 12, 15.
2) I310 maybe failure.
3) R334 or R335 is open.
4) C334, C335, R332, R333 is short.
5. Troubleshooting (continued)
OK
OK
OK
OK
OK
Failure Point
NG
The host machine is not communicated in DDC/
CI mode.
Failure Point
NG
The VGA video cable is failure.
Failure Point
NG 1) Printed wire broke between I304 pin 8, D307
and CN302 pin 9.
2) D307 is failure.
Failure Point
NG
The VGA video cable is failure.
Failure Point
NG
I304 is failure.
ACER A211H/A221HQ 41
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