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TECHNICAL SERVICE MANUAL
8.4 External Monitor No Display
There is no display or picture abnormal on CRT monitor, but it is OK for LCD.
External Monitor No Display
1. Confirm monitor is good and check
the cable are connected properly.
2. Try another known good monitor.
Display
OK?
No
Display
OK?
No
Yes
Replace faulty monitor.
Connect the I/O device & cable to
Yes
the M/B one at a time to find out
which part is causing the problem.
Board-level
Troubleshooting
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:
U504
U12
J502
F501
D503
L510
Q504~Q507
Replace
L503~L509
R511
Motherboard
R515
CP503
120
Check if
Yes
J502
Re-soldering.
are cold solder?
No
Signals:
+5V
+3V
CRT_DDA
CRT_HSYNC
CRT_VSYNC
CRT_DDCK
CRT_R
CRT_G
CRG_B
CRT_IN#
Prestigio Nobile 150
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