I posted several months ago on having this issue on my Note9. I had it (the problem/error) for months and just used wireless charging to get by. I consulted with an official Samsung repair center and they wanted to charge me to tear apart my phone and replace the charging port where the moisture sensor is located because it has failed. I couldn't get them to give me a straight answer on whether the repair would void me trading in my phone down the road since I'm in the jump program. So I opted not to do it. Thank God I didn't pay them. Some time in June (13th or 14th) I got an update, security and bug fixes, and my phone then magically started charging one again and the error messages had disappeared. I did everything that you can find online to fix the problem prior to this and had given up weeks before this update. I feel bad that some people actually paid to have the port replaced when it ended up being a software issue. Even T- mobile wanted me to turn in my phone to get a new one after we hard reset it and it didn't help. Im so glad I have good gut instincts. No need to get a new phone, tear it apart to replace parts or even the dreaded factory reset because it magically fixes itself after an update. Go figure....Good luck folks!
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Just to let people know, majority of the time it is dirty charging port unless somone actually got the port wet. BUT there is also a possibility that the charging port has failed, yes, an actual hardware issue. I personally have tried everything from every site I have been to and every video I watched trying to get my Note 9 to charge by cable. The last thing I did a couple weeks back was the dreaded factory reset. I hated to do it but that was the last thing after weeks of trying everything I read and it did not help. My issue is 100% hardware and needs a new charging port which is where the moisture sensor is located. You must try EVERYTHING you can before giving up and having your phone tore apart to be fixed. I opted to use wireless chargers untill I find my next phone, which won't be a Samsung, after owning 7 Samsung phones. I was loyal, Samsung was not...
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