Overscan Issues On Samsung Smart TV?

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Hi I really need help please.

So I found out my TV had overscan on by default for so long which had cut menus, some of the picture etc.

So I decided to turn it off by enabling "screen fit"

However no matter if I turn TV off, or the receiver or if the receiver is on overscan automatically turns back on.

Why is this happening? Is my TV or box faulty which is causing this?

I am going crazy with this as it shouldnt be changing to 16:9 if I turned overscan off.

I really hope someone can help me. Not sure if Samsung can help.

If it's any consolation I've had exactly the same issue with an old (non smart) Samsung Tv and VU+ Solo2. Every time I switch off the TV and Sat box, the TV reverts back to an overscan mode (16x9 - I think). It's quite frustrating. I'm not at the TV right now so I don't know the model number. Also, I've noticed this issue for well over a year on older Vix revisions, but I don't think its anything to do with that.