Chosen Solution
iPhone came in with error 4014. Tried several computers and cables restoring first. Measured the voltages according to schematics and they all had value. I reballed the NAND and it gave me the same error. Checked the pads underneath and non were missing/damaged. Placed another NAND from an icloud board and still the same error. I searched online and some say it could be BBPMU which I also replaced. I am running out of ideas. Could I have been unlucky and placed an faulty NAND This is my first attempt fixed error 4014. Maybe I missed something?? Any tips what I could check before sending it to China for a boardswap?
You have to reprogram the NAND before installing it on your device. Also check your main NAND lines (PP0V9 and PP3V0) as well as PP1V8. If you remove the NAND again, check the pads in diode mode. Anything connected to the CPU should give you some kind of “normal” readings - check XW for expected readings.
Have you tried another charging IC (tristar)? Sometimes these can cause weird problems with restores on iPhones as that chip is responsible for USB communication and not just charging. If not, you may want to replace the charging chip (try another charging port assembly first before doing so in case of a bad charging port).
