User Guide

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8081
N/B Maintenance
N/B Maintenance
108
8.4 External Monitor No Display
There is no display or picture abnormal on CRT monitor, but it is OK for LCD.
Display
OK?
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.
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:
U502
J501
Q2~Q5
L7~L10
F501
D502
L505
L4~L6
Signals:
+5V
CRT_DDA
CRT_HSYNC
CRT_VSYNC
CRT_DDCK
CRT_R
CRT_G
CRG_B
CRT_IN#
Board-level
Troubleshooting
Replace
Motherboard
Check if
U502, J501
are cold solder?