MiTAC 8355 service manual Display Yes OK? Replace faulty monitor

8355 N/B MAINTENANCE

8.5 External Monitor No Display

Symptom:

The CRT monitor shows nothing or abnormal color, but it is OK for LCD.

AGP Controller Failure

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

2.Try another known good monitor.

Board-level

Troubleshooting

Check if	Yes
U505, J504		Re-soldering.
are cold solder?
No

Display Yes OK?

No

Replace faulty monitor.

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.

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

Replace

Motherboard

Parts:

M/B

Signals:

		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
	No		problem.

U506	Q1
J503	Q2
U9	Q3
U16	RP516
R94	CP502
C211	X3
R505	R139
R508	R141
Q502	L30-L36

CRT-DDCK CRT_DDDA CRT_VSYNC CRT_HSYNC CRT_RED CRT_GREEN CRT_BLUE

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