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8170 N/B MAINTENANCE
Replace faulty
LCD
VGA Controller Failure
1.Confirm monitor is good and check the cable
are connected properly.
2. Try another known good LCD
Display
OK?
Remove all the I/O device & cable from
motherboard except extended LCD.
Display
OK?
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
Board-level
Troubleshooting
Replace
Motherboard
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:
-AC_POWER
-BATT_LED
-BATT_R
-BATT_G
-ENABLE_MSK
-ENABKL
EVPVDD
TXCLK[+:-]
TX2CLK[+:-]
TXOUT[0:2][+:-]
TX2OUT[0:2][+:-]
LCDVCC
BLADJ
BKL_VMAIN
U516 U17
Q3 Q12
R22 Q502
Q500 R515
C506 C507
F502 L505
J2 D500
J1 J6
PJ2 FA501
L[508:510]
U514
L507 C513
C512
8.4 VGA Controller Failure LCD No Display
There is no display or picture abnormal on LCD or monitor.