High pitch noise coming from back speaker

Hi I've recently put a new lcd n screen full set up on my note 2 phone. After a complete reassemble of all the parts back on my phone it all come on fine but the sound makes a high pitch while noise. I've re removed the back cover and screws and I works normal but soon as I put them back in a put cover back on it does the same thing.

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My Moto Z2 Play emits a very loud noise occasionally and as a result my hearing has been affected.


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