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A mid-range smartphone from Samsung released in 2019.

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Bluetooth does not work after replacement

This phone has faced various difficulties. First it went into the water, and then shortly after having it repaired it fell on the ground. After this latest incident, I decided to repair it myself. I will preface this by saying that I was not using the phone (it may be that there were already problems but the user was not using bluetooth).

I changed the battery, display and front camera. Now everything works except the bluetooth. It doesn't always connect with devices, at best it connects but works poorly. For example, if I connect headphones, those few times I can connect them, it is jerky and I can't get too far away from the phone. Any recommendations?

I leave attached photos of how I assembled the phone:

https://drive.google.com/drive/folders/1...

One question: is there a possibility to change a bluetooth card or is it built into the motherboard?

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Sounds like a corrosion issue from the liquid. Open it up again, remove the motherboard and check for signs of corrosion. You might have to remove a few plates too.

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I don't know how to tell if there is corrosion, could you help me? I am attaching photos of the motherboard

https://drive.google.com/drive/folders/1...

One question: is there a possibility to change a bluetooth card or is it built into the motherboard?

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@most99 you’ll have to remove the plates covering the rest of the board especially the black one with the patch on it.

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https://drive.google.com/file/d/1ycRawbO...

Do you mean the one I've outlined in red? Can you tell me how to remove them and what to do after that?

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@most99 yes, and any on the other side too. They can hold moisture.

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Since I'm not yet an expert and I'm afraid of messing up (so far I've only replaced displays, batteries, simple things), could you tell me clearly how to proceed? You would be a great help to me. I haven't worked with delicate things like the motherboard yet. How do I remove these plates? What to do once they are removed? Should I clean them or what else? Thank you very much.

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Gavino Santu さん、ありがとうございました！
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