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7321 N/B Maintenance
7321 N/B Maintenance
Board-level
Troubleshooting
Replace
Motherboard
One of the following components or signals on the motherboard
may be defective or cold solder use an oscilloscope to check
the signals or replace the parts one at a time and test after each
replacement.
RED GRN
BLU HSYNC
VSYNC DDCK
DDDA VCCRGB
Display
OK?
No
Yes
Monitor no display
Check the BIOS setup to see
if no display caused by the
display type is setup error.
Yes
No
Display
OK?
End
Try another known good monitor.
Parts:
Signals:
Q[3-6] L[6-12]
R52 R24
R10 R9
J503 CA[3-4]
CA6 RP18 U21
U15 U16 U22 U23
U25 U26 U28 U29
Symptom:
The CRT monitor shows nothing or abnormal color, but it is ok for LCD
8.5 External Monitor No Display or Color Abnormal
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