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Prestigio Cavaliere 141
8.5 External Monitor No Display
Symptom:
The CRT monitor shows nothing or abnormal color, but it is OK for LCD.
VGA Controller Failure
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
Troubleshooting
Replace faulty monitor.
Motherboard
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.
Replace
Parts:
M/B
U505
J504
FA501
CP503
CP502
CP1
L10
L14
L12
109
Technical Service Manual
Check if
Yes
U505, J504
Re-soldering.
are cold solder?
No
Signals:
VGA-DDCK
L11
VGA_DDDA
RP502
Q13
VGA_VSYNC
Q10
VGA_HSYNC
Q9
VGA_RED
Q14
VGA_GREEN
R41
VGA_BLUE
R62
CRT_IN#
R552
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