Why does my tv go off after few minutes I turned it on

When I turn on my tv, it shows a glitching multi color visual and it normalize's, then fews seconds more the tv goes blank,

All these happens in about two minutes

Please any help on this?

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It sometimes come up for a while and gone off then attempt to come up with reptiting clicking sound from the relay and the standby red light


@idahosabar55362 can you explain this "glitching multi color visual and it normalize's" a bit better. The term glitching is not very descriptive to me :-) Your TV is a LG Plasma TV 42PC7RV-TA? Can you post some images of what your screen shows when it is glitching? Does the power LED give you a blink pattern?在已经存在的问题里加入图片