8050D N/B Maintenance

8.4 External Monitor No Display

There is no display or picture abnormal on CRT monitor, but LCD can normally display.

External Monitor No Display

 

 

 

 

Document

 

 

 

 

 

Secret

 

 

 

 

1. Confirm monitor is good and check

 

Board-lev l

 

Check if J702

Yes

the cable are connected properly.

 

 

Troubleshooting

 

are cold solder?

Re-soldering.

2. Try another known good monitor.

 

 

 

 

 

 

 

 

MiTac

 

 

 

No

 

 

 

Confidential

R10

Q6

 

DDDA

Display

Yes

 

 

 

Check following parts and signals:

OK?

 

Replace faulty

monitor.

 

Parts:

 

 

Signals:

 

 

 

 

Replace

 

 

 

 

 

 

U715

R139

 

CRT_IN#

 

 

 

 

Motherboard

 

 

 

 

 

 

R6

Q5

 

DDCK

No

 

 

 

 

R785

Q7

 

HSYNC

 

 

 

 

R138

 

 

 

 

 

Q8

 

VCYNC

 

 

 

 

 

R136

L12

 

RED

 

 

 

 

 

R137

 

 

 

 

 

 

L13

 

GREEN

 

 

 

 

 

R783

 

 

 

 

 

 

L11

 

BLUE

 

 

 

 

 

R135

 

 

 

 

 

 

L7

 

 

 

 

 

 

 

 

 

 

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