External Monitor No Display - Getac 9270D Service Manual

6.4 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.
Yes
Display
OK?
No
Remove all the I/O device & cable
from motherboard except monitor.
Yes
Display
OK?
No
Troubleshooting
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.
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.
Parts:
Replace
U712
Motherboard
J701
R4
R6
R7
R8
D1
Q1
Q2
U1
U2
EL703~5
Yes
Check if J701
is cold solder?
No
Signals:
+5VS CON_HSYNC
+3VS CON_DDCA
M96_CRT_DDCK CON_BLUE
M96_CRT_DDDA CON_GREEN
M96_CRT_VSYNC CON_RED
M96_CRT_HSYNC
M96_CRT_BLUE
M96_CRT_GREEN
M96_CRT_RED
CON_DDCK
CON_VSYNC
Re-soldering.