8170 N/B MAINTENANCE

8.4 VGA Controller Failure LCD No Display

There is no display or picture abnormal on LCD or monitor.

VGA Controller Failure

1.Confirm monitor is good and check the cable are connected properly.

2. Try another known good LCD

 

 

 

Replace

Display

Yes

Replace faulty

Motherboard

 

OK?

 

LCD

 

No

Remove all the I/O device & cable from motherboard except extended LCD.

 

 

 

Yes

Connect the I/O device & cable

Display

to the M/B one at a time to find

OK?

 

out which part is causing the

 

 

 

 

 

problem.

 

 

No

 

 

 

 

 

 

 

 

 

 

 

 

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.

 

Parts:

 

Signals:

U516

U17

 

-AC_POWER

 

-BATT_LED

Q3

Q12

 

 

-BATT_R

R22

Q502

 

 

-BATT_G

Q500

R515

 

 

-ENABLE_MSK

C506

C507

 

 

-ENABKL

F502

L505

 

 

EVPVDD

J2

D500

 

 

TXCLK[+:-]

J1

J6

 

 

TX2CLK[+:-]

PJ2

FA501

 

 

TXOUT[0:2][+:-]

L[508:510]

 

 

TX2OUT[0:2][+:-]

U514

 

 

 

 

LCDVCC

L507

C513

 

 

BLADJ

C512

 

 

 

 

BKL_VMAIN

 

 

 

 

 

 

 

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