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8.3 VGA Controller Test Error LCD No Display-1
There is no display or picture abnormal on LCD although power-on-self-test is passed.
VGA Controller Failure
LCD No Display
1. Confirm LCD panel or monitor is good
and check the cable are connected
properly.
2. Try another known good monitor or
LCD module.
Yes
Display
OK?
No
Remove all the I/O device & cable from
motherboard except LCD panel or
extended monitor.
Display
OK?
No
80
50QMA
80
50QMA
Replace faulty
LCD or 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.
N/B Maintenance
N/B Maintenance
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.
Main Board
Replace
Parts
Motherboard
U710
U709
U13
J506
J1
J2
J723
Check if
Yes
J1, J2 are cold
Re-soldering.
solder?
No
Daughter Board
Signals
Parts
+3VS
L10~L13
LVDS_TX[0..2]+
SW1
R3
LVDS_TX[0..2]-
C1
LVDS_CLK+
R1
LVDS_CLK-
LVDS_ENBKL
H8_ENABKL
Signals
ENABKL
BLADJ
COVER_SW
115
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