Why is my tv display on off voice only coming

@nazars let me try to clarify your question. The TV turns on, you have sound but the picture turns off and on. The sound stays on. If that is a correct interpretation of your question, then the answer is, your TV has a failed backlight strip.

Since you have not given us any model number or any other identifier for your TV, we can't help you any further. If you need/want more help, we will need more information.

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