原帖由： oldturkey03 ,
Sven Arits, that is reference designator Q2 which is a CSD75202W15 which is a dual FET utilized as a charging and USB control chip. Yes it definitely has to do with the power circuitry. Amazingly enough, it is not just missing, but somebody placed a jumper on it. check the middle row. This is usually performed when Q2 has failed. This is not accidentally. Anyhow, the EMI shield is soldered and would require desoldering, as well as reballing would be required for a replacement of Q2. Hope this helps, good luck.