Chosen Solution
Hi, I’m new to the forum and I wanted to get some advice on steps to take for my iPhone 8. I’ve recently replaced the screen and battery within the phone and when i leave the phone (turned off) over night, from 100% battery it’ll be fully depleted and will require the cable to be plugged in to start the phone off again and charge the battery. This is a fully working battery to my knowledge and has no signs of defects. What steps can you take to identify the issues and find out what’s causing the serious drain on the battery? I’m starting to think it’s something logic board related, but as i say, I’m new to this and I’m learning. I’ll take all advice I can get and steps to take to isolate the problem. If it is logic board I won’t be able to repair this myself as I don’t have the tools nor the skills to attempt this, but it would be nice to sell it on eBay as spares and repairs with some insight into what’s wrong with it for someone else to sort out. Thanks for your time, Craig.
It most likely a partial short on the logic board a VDD_MAIN, VDD_BOOST or another power line short would deplete the battery overnight. To check this disconnect the all the LCD, home button and front camera flexes from the board and see if you get the same battery drain overnight. If you do it means you have a logic board problem. If it doesn’t drain it would point to a parts problem and the part can be determined by connecting one flex at a time and testing drain.
What is your battery health at? Go to settings-battery-battery health. Batteries, even rechargable ones degrade and go bad over time and need replacing.
