So, recently me and a buddy of mine found a box of 12 iPhones. We were piecing them back together little by little. I several of those iPhones were iPhone 8s. One in particular would not turn on, opening it showed some rust, obvious signs of water damage. We replaced the logic board and got the low battery icon when we plugged it in. Even in we unplugged it the phone showed the lightening adapter to plug the phone back in.

However, after being plugged in for over 12 hours, nothing has changed. Is the a battery issue? Maybe another board issue? Where should we check next?

Thanks in advance!

⟐ Commented September 16, 2025 at 18:49 MST

⟐ Commented June 27, 2025 at 10:03 MST

⟐ Commented June 07, 2025 at 11:47 MST

⟐ Commented May 22, 2025 at 9:23 MST

Edit: Well my friend is having the same issue with their iP8, so I guess they have this problem. The phone will die even if it is shut off, it will die in a few hours. It will be so dead it can't show the low battery screen and loses date/time. This seems to be a board issue, I am interested if anyone else has seen this issue?

⟐ Edited by author August 09, 2024 at 23:49 MST

recently though, how the taptic engine will just start tapping away for a while (between 0.5 and 1.0 second intervals) but eventually stop. durations can last a few seconds to over 2 minutes (infrequent). but what also happens during that time, screen responsiveness goes to crap, a lot of times again while i'm trying to play a game.

around the same time this started, the home button has become less responsive, especially when i try to engage double and triple taps. could be related to the taptic or maybe not.

this is definitely weird behavior. i can definitely try a new home button. not sure if the taptic engine would warrant replacing. not sure if there's enough circuitry in it that could go rogue or if the signal to tap comes from the mainboard and the engine is just the mechanical thumper.

any thoughts on how to troubleshoot or what parts may likely need replacing?

goes into the toilet and the phone not working, i open the phone, i seperate the lcd to the phone and make it dry using the fan then i combined it again and its already working. but it keeps frozing so i did multiple force restart to fix. then the home button did not work and i reset my all settings then it work again. until it did not touch the screen again. so i just let it first then i sleep because that already evening. when i woke up my phone got black screen.

what i already try:

force restart- didnt work

reset iphone tru computer- didnt work it says theres an error.

what will i do??? is this cost a lot than replacing an lcd? is this can still fix?

but this week it started crashing after the battery dropped below 80%, and in some cases even crashed when just trying to make a call. As you can see from the battery health graph, the charge plummeted suddenly from 80% to <10% when I tried to make a call. Seems like a severe internal resistance problem, since it cannot handle a heavy electrical load. Or a wacky BMS problem. I wiped and reinstalled the iOS and it did not help.

⟐ Commented September 02, 2023 at 3:08 MST

⟐ Commented December 18, 2022 at 14:08 MST

⟐ Edited by author December 10, 2022 at 14:38 MST

Any help be much appreciated