TV does not have picture (both PSU and main board have been changed)

I have a samsung tv model un40eh5300fxzc (https://imgur.com/pW1Qq16)

There was a problem where no picture or sound and red light blinking.

Changed PSU nothing changed

Changed Main board sound was back and found out that there was still no image but

Image appears when putting tv in a dark place and direct it under a flashlight.

Sound is now functionnal

Now what to do?

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