6.4 External Monitor No Display
There is no display or picture abnormal on CRT monitor, but it is OK for LCD.
Display
OK?
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.
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
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:
U712
J701
R4
R6
R7
R8
D1
Q1
Q2
U1
U2
EL703~5
Signals:
+5VS
+3VS
M96_CRT_DDCK
M96_CRT_DDDA
M96_CRT_VSYNC
M96_CRT_HSYNC
M96_CRT_BLUE
M96_CRT_GREEN
M96_CRT_RED
CON_DDCK
CON_VSYNC
Board-level
Troubleshooting
Replace
Motherboard
Check if J701
is cold solder?
CON_HSYNC
CON_DDCA
CON_BLUE
CON_GREEN
CON_RED