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8170 N/B MAINTENANCE
8.5 VGA Controller Failure Monitor No Display
Replace faulty
monitor.
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 extended monitor.
Display
OK?
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
Board-level
Troubleshooting
Replace
Motherboard
There is no display or picture abnormal on monitor.
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:
RED
GREEN
BLUE
SDA
HSYNC
VSYNC
SCL
U516 R544
R543 Q501
Q501 CP3
RP501 CP501
FA500 L500
L501 L502
CP500 F501
D500 J1