MiTAC 7521 PLUS/N User Manual

114

VGA CONTROLLER FAILURE

1. Confirm monitor is good and check

the cable are connected properly. 

2. Try another known good  monitor. 

Display

OK?

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

Display

OK?

Replace faulty  monitor.

Connect the I/O device &

cable to the M/B one at a 

time to find out which part 
is causing the problem.

YES

NO

YES

NO

Replace motherboard or 

into board-level Troubleshooting.

YES

Re-soldering.

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:

U24
J506
R114
R112
C505
L518
L516
L515
CA501
CA502

Signals:

Check if 

U24, J506

are cold

solder?

CRT_IN#
RED
GREEN
BLUE
HYNC
VSYNC
DDCK
DDDA

PR15
L514
L519
L512
L513
Q501
Q502
R2
R3

There is no display or picture abnormal on CRT monitor.

NO