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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 pin121, 122,
,R410, R414, R344, R345 and P303 pin7,6
2) I308 maybe failure.
3) R338, R339 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
1) Printed wire broke between P303 pin 14 and pin 16.
5.8 Abnormal plug and play operation (For DVI and the same for HDMI)
31
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5. Troubleshooting (continued)
ACER H233H