8224 N/B Maintenance
8224 N/B Maintenance
122
8.5 External Monitor No Display-1
There is no display or picture abnormal on CRT/DVI monitor, but it is OK for LCD.
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:
U511
J502
U502
U05
Q3
Q4
CP501
CP502
R28~R32
R531~R533
Signals:
+3VS
+5VS
CRT_DDDA
CRT_HSYNC
CRT_VSYNC
CRT_DDCK
CRT_RED
CRT_GREEN
CRG_BLUE
Check if
J502/J501
are cold solder?
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
Board-level
Troubleshooting
Replace
Motherboard
Q503
Q504
L1
L4
L505
R513
R514
R551
R554
DVI_5VS
HPDET
M5X_DVI_TX[0..5]+
M5X_DVI_TX[0..5]-
M5X_DVI_DDCK
M5X_DVI_DDDA
MiTac Secret
Confidential Document
Summary of Contents for 8224
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