5. Troubleshooting (continued)

ACER G24

25

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5.6Abnormal Plug and Play Operation

5.6.1Abnormal DDC2 (D-SUB)

Failure Point

Confirm the output of serial

 

 

 

 

 

data on I312 pin6 synchronize SCLK at

 

NG

 

 

I312 is defected

 

 

TTL level

 

 

 

 

 

 

 

 

 

 

 

OK

Failure Point

1.The host machine isn’t communicating in DDC2 mode.

2.The video cable may have defected or may not be established connection for DDC.

3.The I312 pin6 and P304 pin15 may have no signal or incorrect.

4.The R374, R377 is open.

5.I312 pin6 is short.

6.The input source cable is defected.

7.Check I312 pin5 signal whether if correct.

5.6.2Abnormal DDC2 (DVI)

 

 

 

 

 

Failure Point

Confirm the output of serial

 

 

 

 

 

 

 

 

 

 

data on I313 pin6 synchronize SCLK at

 

NG

 

 

I313 is defected

 

 

TTL level

 

 

 

 

 

 

 

 

 

 

 

OK

Failure Point

1.The host machine isn’t communicating in DDC2 mode.

2.The video cable may have defected or may not be established connection for DDC.

3.The I313 pin6 and P305 pin6 may have no signal or incorrect.

4.The R393 or R397 is open.

5.I313 pin6 is short.

6.The input source cable is defected.

7.Check I313 pin5 signal whether if correct.

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Image 26
Acer MB243WABNS service manual Failure Point Confirm the output of serial