Acer AL1716 Service Manual - Page 21

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Acer AL1716 Service Manual
ACER AL1716W
20
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4.7 Abnormal plug and play for VGA

Confirm the host computer supplies DDC2
mode.
OK
Check the voltage on P302 pin10
that is power DC 5V.
OK
Check the voltage on I304 pin8
that is power DC 5V.
OK
Check the voltage on
P302 pin12, pin15 that are serial
data and clock signal.
OK
Check the output signal of serial data and
clock signal I304 pin5 and pin6
OK
Failure Point:
1. R328, R329, R326, R327 is open.
2. D309, D310 is short.
3. C331, C332 is short.
4. Troubleshooting (continued)
Failure Point:
NG
The host computer is not communicating in DDC2 mode.
Failure Point:
NG
The VGA video cable is defected.
Failure Point:
NG
1. Printed wire is broken between P302 pin9 and I304 pin8
2. D307 or D308 is damaged.
Failure Point:
The VGA video cable is damaged. If I304 pin5, pin6 LOW,
NG
the I304 may be failure.
Failure Point:
NG
I304 is defected.