@bh_j39200 Yeah, the board actually seems pretty easy to replace. Outside of the speaker itself, that board is about the only other part involved in connecting the speaker to the motherboard; there is the big cable that goes across the battery as well, but it sure seems like something has gone wrong in the signal path.
You can find the part pretty easily; here's an example from eBay that comes with the flex cable.
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https://www.ebay.com/itm/264861637000
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[link|https://www.ebay.com/itm/264861637000|Samsung Galaxy A51 5G A516U USB Charging Port Charger Dock Connector Flex | eBay|new_window=true]
Although iFixit doesn't have a guide for that, there's one for the A51 over on the French site SOSav that should get you by.
@bh_j39200 Yeah, the board actually seems pretty easy to replace. Outside of the speaker itself, that board is about the only other part involved in connecting the speaker to the motherboard; there is the big cable that goes across the battery as well, but it sure seems like something has gone wrong in the signal path.
You can find the part pretty easily; here's an example from eBay that comes with the flex cable.
https://www.ebay.com/itm/264861637000
Although iFixit doesn't have a guide for that, there's one for the A51 over on the French site SOSav that should get you by.
https://www.sosav.com/guides/mobiles/samsung/galaxy-a51/connector-load/
Good luck, let us know how it goes.