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Arno Wagner

In comp.sys.ibm.pc.hardware.video wrote:
Hi,

About a week ago my 19" CRT started displaying an extremely distorted
picture. It intermittently goes into a state where the picture is
broken up into fuzzy lines (I can't describe it well) and the
slightest tap on the case could cause it to return to normal
(temporarily) or get worse.

Contact problem affecting the sync-signals. May be in the external
connector or in some internal ones.

I've checked for any broken video connections inside or outside, but
there are none. What's weird is that I ran the monitor with the
plastic case off and the problem disappears. But as soon as I put the
case back on the slightest movement or tap near it makes the picture
go crazy again.

Probably removing the case puts the problematic connection
under different mechanical stress than when it is on. This
often improves contact conditions.

Does anyone have any ideas as to what the problem could be? Could the
case be causing some sort of interference?

No. This is very typical for a broken solder point or a marginal
connector. This is also very hard to find. Fix is easy once
you know here the problem is. If is a connector, you may
want to remove and reseat every connector you can get at. Be
careful that the CRT may remain charged up to some hours
after it has been disconnected from power.

Arno