MiTAC 8050QMA Manuel de service télécharger pdf (Page 118)

117

50QMA

N/B Maintenance

8.4 External Monitor No Display-1

There is no display or picture abnormal on CRT monitor, but it is OK for LCD.

Yes

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:

U710

J702

J723

L11

L10

L30

Signals:

+3VS

CRT_DDDA

CRT_HSYNC

CRT_VSYNC

CRT_DDCK

CRT_RED

CRT_GREEN

CRG_BLUE

Check if

J702

are cold solder?

Display

OK?

External Monitor No Display

1. Confirm monitor is good and check

the cable are connected properly.

2. Try another known good monitor.

Remove all the I/O device & cable from

motherboard except monitor.

Display

OK?

Replace faulty monitor.

Connect the I/O device & cable

to the M/B one at a time to find

out which part is causing the

problem.

Yes

Board-level

Troubleshooting

Replace

Motherboard

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MiTAC 8050QMA Manuel de service Page 118

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