Why my TV is turning blank randomly?

Can anyone help me by telling me what's the problem?

1) TV starts and works perfectly well if started the first time in the day.

2) TV video fades away if turned off and switched on again.

3) TV picture completely blank after few start-ups. All the time, the audio works perfectly. The backlight is good and even with no picture, the backlight is on.

https://www.youtube.com/watch?v=8AX0V4zj...

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