5. Troubleshooting (continued)

5.4 Abnormal screen for VGA

ACER X193HQ

 

23

 

 

 

Go to cover page

Check the R, G, B video signal from computer

input on P302 of video connector.

NG

OK

Failure Point

1)No R, G, B video signals output from host computer, check computer.

2)Video signal cable disconnection.

Check the R, G, B input video signals on I305 pin12, 14, 16 respectively that their level is 0.0 to 0.7Vp-p.

NG

OK

Check all LVDS signals being output to P305

from I305?

NG

OK

Failure Point

In the case of the Red signal. (A Green and Blue signal is the same path, too.)

1)Printed wire broke between P302 pin1 and I305 pin16.

2)Video cable is failure.

3)FB302,FB306,R327 is open.

4)R326 is short or open.

5)C315 is short or open.

Failure Point

Printed wire broke between I305 and P305.

Prpcess "Checking the resolution change IC

movement" section.

Page 24
Image 24
Acer RA19WAANU service manual Troubleshooting Abnormal screen for VGA