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i have a water damaged 820-4924 that has no green light and a short on pp3v42. the water damage was mostly centered around q7130. question: on schematic q7130 isn't directly connected to pp3v42, but it is directly connected to the charging circuit. if that's bad, can q7130 cause a short on...

board is water damaged. board was not getting green light on magsafe. checked pp3v42 and was only getting 69ohm (pretty close to short to ground). i injected 3.5v but its not drawing enough amps to heat anything up. Any suggestions?

so i found a short on c5811 and traced it back to u5800. replaced it and now its passing asd. thanks for the help!

trace seems to be fine in diode mode and resistors are reading 1.9k i reballed u5800 connections and resistors to be sure. getting same errors. should i replace u5800?

yes i did. I replaced the logic board with an all good board and everything is working fine. so i know all parts are good.

https://imgur.com/a/opabYsL looks like it has cpu sensor, air flow and camera sensor bad

Got a 820-3437 that powers on and boots up. It has full fan spin and is very slow. All temp sensors show normal in mac fan control. I have replaced the trackpad and flex which didn't fix issue. no signs of corrosion or water damage. The only thing abnormal was a loose screw around c7323. s5 hs...

820-2936 one usb when plugged in says usb overcharged error. trackpad also has issues. there are random spots of corrosion here and there but nothing that is on the usb line. i've cleaned out the board and replaced u2600 u5701 - still no usb

schematic says 12.8? is it incorrect?

yes sir, always apple store 85W chargers only :) i just noticed its 12.6 isn't this gonna be an smc problem? isn't ppubs suppose to be 12.8?

replaced q7030 q7035 q7055 u7000 now i have 12.6v but still no boot.

can i take q7030 q7035 q7055 from a 2011 board? i don't have an 15" 2012 donor board.

got a 820-3330 board looks like it had some slight liquid damage. ppbus is 17.85 which is weird. dunno where to start with this one.

thanks guys. all solved :)

usb type c port burned to hell. switched out the working on from the other side and it that port still doesn't work. where do i start to test?

exploded diode/coil? anyway, customer brought this in saying smoke was coming out. does not power on anymore. don't have schematics or boardview, is this connected to the cpu and is dead? https://imgur.com/gallery/HZsTj9L

does not power on customer came in for data recovery disassembled the board and connected to power supply and got PP3v3_R3V0AON - 3.288v ppbus - 8.59v however with keyboard attached ppbus drops to 8.18. have tried new keyboard w/ cable as well. all i really care is about data. does this have a...

i replaced the super drive and is still causing long chime times. any particular line i should check or just check them all?

okay weird one here. i swapped the bios turned on fast. put it back together and 5 minute chime. one by one i connected and its the super drive that is causing this.

have you tried with known good ssd or external boot? as far as i know flashing folder is os corruption.