My oldish Sony has started blinking to black every few minutes---is it just about finished or should I think about having it repaired?? It is connectedto a Brighthouse cable box.
If you still have the sound when the picture blanks out you might have a weak picture tube . Are the colors bright or somewhat weak . If they are its the picture tube . Now if it has good color and brightness then you may have a loose connection in the set or something wrong in the video circuit . Older sony tv tend to have weak picture tubes .
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