Gray screen, no image but sound and menu available.

Hi,

I have searched for similar cases like mine, but no success yet, so I decided to start a new one.

I have this tv, 2 years and 3 months old. Warranty just expired.

It started to show flickering just in the right side of the screen. I could see the image clear, but as soon as 10-15 min while tv was ON, the flickering was worse. Still the image can be seen, however, if you look for the tv menu, only left part can be seen, because the right side of the screen is flickerig and it cannot be seen.

If I turn off and turn on the tv, the flickering remains, but this time the image is no longer available. Still with sound and menu available, only left side of the screen.

I left the tv off during three days, so I turn it on again and everything was OK. Image available and full screen. It lasted 10 min and flickering appeared again. Same as above.

This time I let the TV on during 12 hours. During that time the image was OK, just flickering the right side.

The tv menu, again, at some point lost right side.

The flickering dissapeared, maybe at 11 hour mark. Everything looked OK.

I turn off the tv during 10 hours. When it was ON again, screen was complete, no flickering, but there was no image, just sound. The screen is gray, no fully black, and tv menu is fully available.

I have checked different HDMI cables. There is no issue at that side.

What could be the problem?

Is it fixeable?

Thank you