After riding motorcycle, I accidentally dropped my Oppo A18. When I try to connect WI-FI and BLUETOOTH, I need the phone very near to the router or device because when I take the phone even 1 metter away it will disconnected.
Is this a good question?
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Seems like it may be a loose coax antenna connection at either end, systemboard or sub board.
Below is an image taken from this teardown video showing the antenna and antenna connections.
(click on image to enlarge)
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