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8355 N/B MAINTENANCE
8355 N/B MAINTENANCE
133
Connect the I/O device & cable
to the M/B one at a time to find
out which part is causing the
problem.
1. Confirm LCD panel or monitor is good
and check the cable are connected
properly.
2. Try another known good monitor or
LCD module.
Replace faulty
LCD or monitor.
Check if
MB:U506,U16, J2, J3,
Charge BD: J2,J3
are cold colder?
AGP Controller Failure
Display
OK?
Remove all the I/O device & cable from
motherboard except LCD panel or extended
monitor.
Display
OK?
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:
TXCLK+
TXCLK-
TX2CLK+
TX2CLK-
TXOUT[0:3]+
TXOUT[0:3]-
TX2OUT[0:3]+
TX2OUT[0:3]-
PANEL_ID[0:3]
ENABL_VGA
+PANEL_VDD
Board-level
Troubleshooting
Replace
Motherboard
Yes
No
BLADJ
ENAVDD
U506
U511
U9
U16
J2
J3
R94
C211
R137
R141
R139
X3
F501
Q518
Q503
Q501
R503
R504
L46
L39
L42
D503
Symptom:
There is no display on LCD although power-on-self-test is passed.
8.4 AGP Controller Failure LCD No Display