135
8575
8575
A N/B Maintenance
A N/B Maintenance
8.4 External Monitor No Display
There is no display or picture abnormal on CRT monitor, but it is OK for LCD.
Display
OK?
External Monitor No Display
1. Confirm monitor is good and check
the cable are connected properly.
2. Try another known good monitor.
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
Yes
Re-soldering.
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:
U4
U14
U508
J2
R1
R566
R546
R547
R548
Signals:
Check if
U4, J2
are cold solder?
CRT_IN#
REFCLK0
CRT_DDDA
CRT_HSYNC
CRT_VSYNC
CRT_DDCK
CRT_RED
CRT_GREEN
CRT_BLUE
Q505
Q502
Q501
Q506
FA501
L503
L502
L501
Board-level
Troubleshooting
Replace
Motherboard