Black screen .but have sound

[scooby62]

Good morning

I havea Samsung 61 cm smart TV.

It is about 5 years old.

Lately while watching TV the screen will start to go dim then from the left hand side it starts rolling black across the screen . But I have sound.

I can turn it off and on again but after about 20 minutes it happens again.

Can someone help me

[Manue12]

Looks it's like a faulty panel