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I get a black squar with letters and numders. The letters and noumbers
just keep changing. It is not fron the satelight becaus my ourther TVs dont do it it may go for a week and not see it next time you have to turn chanels to get it to stop. Please help Harry
You apparently have a high voltage arc.
Possibly the anode lead to your picture tube.
Also the flyback transformer could be arcing.
If you're not experience with tv repair, you need to have a tech check it for you. The circuits operate at very high voltage and if you get into it you can get a possibly fatal electrical shock.
Be careful !!!