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I obtained 2 completely dead iPhone 6s plus devices. They do not charge or are recognized by iTunes (with or without battery connected to the motherboard). They do not warm up. I currently do not have an ammeter, but I used a battery pack that automatically detects devices. These are not detected. I suspect that both devices have a bad U2 IC, but I’m not sure of that. I already ordered a new battery and dock connector. But these are still on their way. I ordered these just to be sure. Will the device boot with a new charged battery if the U2 IC (normally only for charging and USB connectivity) is dead? Or are there any more steps I can perform? Thanks in advance. Kind regards, Stefan
iPhones do bootup with charged batteries that have a bad Tristar (U2) charging IC. Some things to note: If you can’t get an apple logo with battery unplugged the Tristar is bad provided you can turn the phone on with a charged battery. Once you get the phone on you can also try plugging the phone to a computer to see if it detects via iTunes / 3Utools.
