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La version Wi-Fi+ cellulaire de l'iPad Air d'Apple, numéro de modèle A1475. Disponible en gris sidéral ou argent, il emploie le processeur A7 personnalisé et est livré dans des configurations 16, 32, 64 et 128 Go.

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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 :)

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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?

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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.

par

Or you suggest I should reball the CPU???

par

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.

par

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

par

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

par

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Peter Hupuczi sera éternellement reconnaissant.
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