8224 N/B Maintenance
8224 N/B Maintenance
120
Display
OK?
Replace faulty
LCD or monitor.
Display
OK?
VGA Controller Test Error
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.
Remove all the I/O device & cable from
motherboard except LCD panel.
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
Re-soldering.
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:
Signals:
Board-level
Troubleshooting
Replace
Motherboard
Yes
No
+3VS
DVMAIN
H8_ENABKL
ENBKL_M5X
BLADJ
M5X_ENVDD
LVDS_TX[0..2]+
LVDS_TX[0..2]-
L
LVDS_CLK-
8.4 VGA Controller Test Error LCD No Display-1
There is no display or picture abnormal on LCD although power-on-self-test is passed.
Check if
J1, J2 are cold
solder?
U511
U15
J1
J2
J501
U1
Q2
Q502
L5~L8
L518
MiTac Secret
Confidential Document