crwdns2936637:0crwdne2936637:0 crwdns2853008:0crwdne2853008:0 crwdns2861143:0crwdne2861143:0

iPad Air Wi-Fi + Cellular, model no. A1475. Available in Space Gray or Silver, with 16/32/64/128 GB configurations.

crwdns2934591:0125crwdne2934591:0 crwdns2934593:0crwdne2934593:0

crwdns2933897:0crwdne2933897:0

PMIC Replaced - Missing voltages

I have an iPad Air (1st gen) which I have replaced the PMIC. The reason for that is because the iPad charges only when it was switched off.

I have lifted the following pads during removal of the PMIC:

  • B17
  • B16
  • B15
  • C16

Dont know If this is the cause of the problems below:

  • No backlight (filters are good)
  • Missing voltage on PP3V0_SPARE1
  • Missing voltage on PP3V0_S2R_SENSOR
  • Missing voltage on PP3V3_ACC
  • No Heat on the board, and I can see apple logo on screen without backlight looping.

Anyone can point me in the right direction or explaining those missing voltage lines could be a BIG help understanding the situation.

Thanks :)

Block Image

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0

crwdns2933313:01crwdne2933313:0

crwdns2934221:0crwdne2934221:0
crwdns2931211:0crwdne2931211:0 crwdns2931215:0crwdne2931215:0 crwdns2934225:0crwdne2934225:0

crwdns2933897:0crwdne2933897:0

hello Peter,

too high temp and flow you use for taking off a glue and a ic. It seems like cpu overheated. Have you stencil for reballing?

crwdns2934105:0crwdne2934105:0

crwdns2853045:0crwdne2853045:0 crwdns2853046:0crwdne2853046:0
crwdns2889612:0crwdne2889612:0 0

crwdns2944067:06crwdne2944067:0:

Yes! I have used a brand new PMIC already reballed.

Also I have measured around all Caps with Multimeter Diod mode wich resulted NO short on the board.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

Or you suggest I should reball the CPU???

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

this is dependent to board measurement. But it looks like. I would measure RAM and NAND beforehand but it looks like yes, I would do a CPU reballing.

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

sometimes, problem is in technical's hand work. Are you sure IC is sitting down correctly?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

A smudged the corners and it seems ok....

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934273:01crwdne2934273:0

crwdns2934285:0crwdne2934285:0

crwdns2934229:0crwdne2934229:0

Peter Hupuczi crwdns2934231:0crwdne2934231:0
crwdns2936625:0crwdne2936625:0:

crwdns2936751:024crwdne2936751:0 0

crwdns2936753:07crwdne2936753:0 7

crwdns2936753:030crwdne2936753:0 25

crwdns2942667:0crwdne2942667:0 400