Chosen Solution
Hello, I have an iPhone X board here which mysteriously died while a repair. When connecting to a charging cable, it pulls about 0.4A (never more) but does not get hot, so all of the energy goes into the battery, port is ok as well. Windows says “there was a problem with this USB device” and except that 0.4A draw the phone is completely dead. Not reacting at all. It would be helpful if you could give me reference voltage values for troubleshooting… Could it be the Tristar? The problem might have been caused by a poorly fitted charging dock connector. I tried with two different fully working housings (also with everything unnecessary disconnected) so it definitely is something with the logic board. Thank you very much!
Getting a steady reading of 0.44A is usually a phone in DFU mode. What problem, exactly, were you trying to repair? You may have accidentally damaged the board or a flex during your repair. The first thing to do is to do a thorough inspection of the flexes, connectors and surrounding area. Running just a bare board (I believe you tried this) can help you confirm but in your case, you will have to identify a known-good charge port.
