MiTAC 8355 Benutzerhandbuch
8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
135
Connect the I/O device & cable
to the M/B one at a time to find
out which part is causing the
problem.
to the M/B one at a time to find
out which part is causing the
problem.
Remove all the I/O device & cable from
motherboard except monitor.
motherboard except monitor.
1. Confirm monitor is good and check
the cable are connected properly.
2. Try another known good monitor.
Display
OK?
AGP Controller Failure
Display
OK?
Replace faulty monitor.
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.
defective, use an oscilloscope to check the following signal or
replace the parts one at a time and test after each replacement.
Parts:
Signals:
Check if
U505, J504
are cold solder?
CRT-DDCK
CRT_DDDA
CRT_VSYNC
CRT_HSYNC
CRT_RED
CRT_GREEN
CRT_BLUE
CRT_DDDA
CRT_VSYNC
CRT_HSYNC
CRT_RED
CRT_GREEN
CRT_BLUE
Q1
Q2
Q3
RP516
CP502
X3
R139
R141
L30-L36
Q2
Q3
RP516
CP502
X3
R139
R141
L30-L36
Board-level
Troubleshooting
Replace
Motherboard
M/B
U506
J503
U9
U16
R94
C211
R505
R508
Q502
J503
U9
U16
R94
C211
R505
R508
Q502
Symptom:
The CRT monitor shows nothing or abnormal color, but it is OK for LCD.
The CRT monitor shows nothing or abnormal color, but it is OK for LCD.
8.5 External Monitor No Display