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Lumia 830 proximity sensor fail after screen change

So just changed a Lumia 830 broken screen. Used one with attached frame rather than screen only and swapped the white frame with a black one.

Not sure if any of that matters.

So now seems like the proximity sensor isn't working.

Is it a simple swap? Sorry I probably answered my own question but maybe someone has some experience

In Lumia 830s

Thanks

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