My charging port was not working so I changed out the daughter board. New board charges great, but cellular data no longer works. If I put the old one back in it works again. I have tried 3 different replacements with same result.
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What @strongbow said above. Make sure you're using the one that corresponds with your model. There's an international and US version of the daughter board. If you use the incorrect one it can result in a no service issue. Order an OEM one if you can.
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Where are you buying the new boards from and are they genuine samsung? Also make sure you are buying the correct board for the model number, not just s21+. Look for SM- etc.
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