8170 N/B MAINTENANCE

8.5 VGA Controller Failure Monitor No Display

There is no display or picture abnormal on monitor.

VGA Controller Failure

1.Confirm monitor is good and check the cable are connected properly.

2. Try another known good monitor

Board-level

Troubleshooting

 

 

 

Replace

Display

Yes

Replace faulty

Motherboard

 

OK?

 

monitor.

 

No

Remove all the I/O device & cable from motherboard except extended monitor.

 

 

 

Yes

Connect the I/O device & cable

Display

to the M/B one at a time to find

OK?

 

out which part is causing the

 

 

 

 

 

problem.

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

One of the following parts on the mother-board may be defective, use an oscilloscope to check the following signal or replace the parts one at a time and test after each replacement.

Parts:

 

Signals:

U516

R544

 

RED

R543

Q501

 

GREEN

Q501

CP3

 

BLUE

RP501 CP501

 

SDA

FA500 L500

 

HSYNC

L501

L502

 

VSYNC

CP500 F501

 

SCL

D500

J1

 

 

 

 

 

 

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