Magnetic case interfering with proximity sensor

[Mightymouse1111]

I noticed recently that my display goes black as soon as I start a call and stays black when I take the phone off my ear to look at it. Double tapping the screen or pressing the side lock button will bring the display back on.
Samsungs website chat was no help. But today I figured out that the phone works fine when I detach it from the magnetized wallet part of the case, leaving only the smaller case attached to the back.
Case is here: https://burkleycase.com/collections...amsung-galaxy-s20-plus?variant=31318343385182

The screen will be lit up until I allow the magnetized back to attach to folding wallet part of the case and then go black. I pull it back off the wallet part (with the smaller part of the case still on the back of the phone) and the display lights back up.

I assume this is due to magnetic interference when the larger part of the case is attached, it just really surprises me this is a problem when the sensor is on the screen and not on the back.

Anyway, any ideas about how to fix this without getting a new case?
Is this purely a physical problem or could software be at fault too?
Im just looking for thoughts and advice. The phone works perfectly to my knowledge otherwise.

Thanks
Joe

 

[B. Diddy]

Welcome to Android Central! I'm guessing that the phone thinks you're using an S-View flip cover, which uses magnetic sensors to figure out if one is attached. The magnet from the wallet part of the case is probably too strong and is triggering that sensor. https://android.stackexchange.com/questions/64721/how-does-samsung-s-view-flip-cover-work

 

[Mightymouse1111]

Ah ok, thanks, at least that gives me something to go off. I'm going to try slipping a few different materials between the cases or the smaller case and the phone. No high hopes but maybe just reducing the magnetic strength reaching the phone will resolve it. I'll post my results.

 

[blackhawkhot]

Try a piece steel sheet metal to shield it. Too large it may degrade signal, too small it won't work. Perhaps a small piece about an inch or two in diameter over the place where the sensor lives would do the trick.