Chosen Solution
I’m trying to diagnose an issue with a 6s, as to whether it’s a battery, charger port or charger IC chip issue. the latter which i’m not able to fix. the initial problem appeared to be that the phone would not power up. i took it apart and tested known good batteries in that phone, and that phone’s battery in other phones.what i found is that if the battery is well and truly drained, meaning you don’t even get the empty battery with a thin red strip and the lighting plug on the screen, then the phone would not charge it, or even draw current over the chargning port. if there is even a tiny charge left, then it would charge okay. is this a charger port board issue or a charger IC issue? the only thing i haven’t tested is that phone’s motherboard with a good charger board.based on what i’ve described, is that enough to say it’s the charger IC chip on the motherboard? or should i attempt to test a new charging port board with the motherboard in question? i was able to recharge the battery it came with in another phone and when put back it worked just fine. if drained almost all the way, it would recharge, but if drained all the way dead, it would not recharge. this is the case with other batteries, which leads me to rule out the battery as the problem. thoughts, ideas, opinions? Thanks in advance.
We always rule parts out first but this symptom is usually the result of a faulty charge circuit component on the logic board mainly the Tristar IC.
