Chosen Solution
Hi, I run a small side business fixing iPhones. The other day i replaced an iPhone 7 charge port flex and battery after a client brought his phone to another repair shop. The client said the repair shop replaced the battery but this did not fix his phone because the “charge port is causing a short on the battery” so the battery went dead. Long story short, I replaced his charge port and battery, the phone worked well for a few hours and then went dead. I replaced the battery again and the same thing happened. I wasn’t able to charge the phone after replacing the flex cable. It seemed the batteries went dead very quickly, so I’m assuming some type or short happened. Do I just need to try and replace the charge port flex again (faulty part?) or is this an issue with the board-level ICs? Update (11/09/2020) Update: Ive got another charge port coming in a few days so I can try that if the customer still wants to wait. I don’t see any visible damage around the battery connector but I haven’t checked underneath the waterproofing foam inserts so it is still possible that the other shop botched something (they also tore his home button flex so I wouldn’t be suprised). I tested the voltage through the system as described in this guide: https://www.microsolderingrepairs.com/bl… and got a reading of around 0.7v (same as the guide). So, Im pretty certain this is an issue with the tristar and is therefore way over my capabilities of fixing. Thank you both for the helpful answers!
hello Alex, you have got a short circuit on the board. It will be on logical or mid power rails like 0,9; 1v0; 1v8 etc - not enough to crash system but drain a battery quickly. Use a thermo cam or freezee spray, DCPS and microscope for electronics. Power it up by the tweezers and find it. That is very easy if you have knowledge and experience. If not, it can lead you into a “rabbit hole”. Dont forget have a look on 610A3B (Tristar) and SN2400 (Tigris charger ic). take care and regards,
Alex Burke yes I would go ahead and replace the charge port flex again. Just to rule it out. The other thing you want to do, is to use an USB ammeter to check and see if the phone is actually drawing any current while it is supposed to be charging. Once you have your phone apart double check all the components around the battery connector. Make sure that none of them got damaged or even knocked off during a repair. Worst case scenario could be issues with your U2 IC (Tristar). Let us know what you find out.
