c1200 is shorted and PMIC gets hot, needs PMIC replacement?
Newbie here, just on my third iPhone repair (microsoldering) and wanted to get your feedback before I take off the PMIC and replace it.
I have a water damaged phone here, upon first inspection and after cleaning it didn't look so bad, but it was dead as a doornail. AMmeter does show 0.5a when I plug the logic board in (new battery, new dock connector, new screen). No sound/image though and the PMIC gets hot real fast.
Measuring caps along VCC main revealed a short to ground on C1200. I replaced that with a known good working one from a donor board, but the short is still there.
Seeing as PMIC gets hot as well, I think it's that that needs replacing or do you gurus have another thing I can try before I go that route ?
Thanks in advance for any tips !
Major update :
Turns out I was looking at the wrong spot the whole time. I thought the PMIC was getting hot, but in reality it was the CPU, a lot of caps near the CPU top row were also shorted out. Measured D1501 diode and only came out on 0.002, so the backlight diode was (one of the culprits), I suspect the backlight IC itself is also faulty. and maybe even the coil. I'll order a set of those and give it one last try.
I didn't think it would be 'just' a backlight issue, since I tried shining with a heavy duty flashlight through the back of the lcd and nothing appeared, but I guess a faulty backlight coil/ic/diode could cause these symptoms ?
This is really a rabbit hole, I don't think I'm a big fan of waterdamage repairs :)
Is this a good question?