Blinking tv problem

I dont remember the make or model, just a general question about
repairing a tv that is blinking. The clear picture goes into a black
screen for a full sec then comes back. Repeats every 5 mins or so.
Any thoughts? The tv is about a 27 in tv bought back in the early 90's
is the only detail for now that is constantly used.

Thanks in advance.

.

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