Chosen Solution
Hi I have an IPhone 6S that is fake Charging. I have replaced Tristar and Tigris 2 times. I have also jumped the mosfet. I get zero volts at the battery connector. The phone does boot up with usb charger connected and also get the lightning bolt. But zero current is being drawn from the charger.
Sounds like the battery is dead. Apple offers battery replacement for cheap. You could check with the apple store. It’s hard to diagnose Li-ion batteries so I can’t say fo certain. Ifixit also has batteries you can buy and do the replacement yourself Good luck.
