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8.4 External Monitor No Display-1
There is no display or picture abnormal on CRT monitor, but it is OK for LCD.
External Monitor No Display
1. Confirm monitor is good and check
the cable are connected properly.
2. Try another known good monitor.
Yes
Display
OK?
No
Remove all the I/O device & cable from
motherboard except monitor.
Yes
Display
OK?
No
80
50QMA
N/B Maintenance
80
50QMA
N/B Maintenance
Troubleshooting
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.
Board-level
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:
Replace
U710
Motherboard
U2
J702
J723
L11
L2
L10
L30
Check if
Yes
J702
are cold solder?
No
Signals:
+3VS
CRT_DDDA
CRT_HSYNC
CRT_VSYNC
CRT_DDCK
CRT_RED
CRT_GREEN
CRG_BLUE
Re-soldering.
117
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