Chosen Solution
Hey iFixit Community, I recently bought a used iPhone 8 A1905 from eBay. Got it pretty cheap so i thought i’d try to get it running. So the seller told me that after it fell (back is completely broken) it was dead. It doesn’t vibrate / gets recognized by iTunes. The Display didn’t take any damage and everything else is Original as it was never opened. Anyone have an idea what this could be? Thanks
@actualnoob Yup, some try and error needs to be done, otherwise we’re just guessing without any clue. Take apart screen and start disconnecting parts from the logic board, then plug back one by one starting from lightning dock. Hope you have at least a USB Ammeter to see if the board draws any current or it’s shorted for good..if you don’t have it you’ll need to buy one to start with. In case you’re a lucky guy, you’ll see some life signs with just dock and battery..plug into a PC to see if the iPhone gets recognized. In case it doesn’t you’ll have to try with a known good dock and battery. In case you still have no life signs, then you probably have a board issue.
Step by step here Connect the phone to an expernal power supply and set the voltage to 3.9V. Then turn on the phone and keep a close eye on the current it takes,. It should not go above 1.2A If it does shut the phone down immediatly. Before you u turn the phone on with the PSU connected the currrent should be zero Take your results turn your phone off and post them here Depending on your results we will knonw the next step to take This is a step by step process to find the faul
