Hi,
I've bought an iPhone 8 with a dead battery and a slightly water-damaged home button. I've replaced the battery with an iFixit battery, and a home button off eBay. Everything on the phone is now working perfectly fine, apart from the fact that it drains its battery from 100% to 0% in a few hours when it's powered off.
I suspected a (partial) short or something similar, so I powered it down, took it back apart and let the logic board cool down. I then took a photo with my thermal camera and one of the display flex cables is staying noticeably warm even when the phone is turned off:
[image|3121823]
This only goes away when I disconnect the battery. There is no corrosion anywhere on the logic board, I've re-seated the FPC connectors, and checked that all pins on the connector are clean and straight. I also don't see any knocked-off capacitors or something like this.
Could that heat be the current draw that is draining my battery, and what could be the root cause of this?
Thanks in advance