The wi-fi only version of Apple's iPad Air, model number A1474. Available in Space Gray or Silver, it packs the custom A7 processor and ships in 16, 32, 64, and 128 GB configurations.

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All functions are normal or suddenly turned off

All functions are normal or suddenly turned off.

Is something a proble

Logic board visual inspection is normal

There are no other problems and the CPU temperature is very high.

I think the CPU temperature is high.

SHORT on CPU side?

Where should I check?

I checked several component

In the sound test mode, the resistance value is measured, but is it normal if no sound is heard?

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cpu is getting hot and finally reboot

The same occurs both when the power supply is connected and when the battery is connected.

voltage value

ppvdd sram 1.188

ppvdd cpu 0.84

ppvdd gpu rail 0.97

ppvdd soc 0.947

pp1v8 s2r 1.8

sw 1.8

pp1v2 s2r 1.2


sw2 1.2

pp3v3 s2r 3.278

nand 3.27

pp3v0 tristar 2.997

pp1v8 1.794

ppbat 5.1


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Your PPVDD_CPU & PPVDD_GPU appear low to me. They should measure 1.1V. If they are measuring lower, then it is indicative of the PMIC (which supplies the those rails) going into current limiting mode. I would insect al of the bypass capacitors on those line to see if there isn't a problem. Sometimes there are tiny solder balls that can short neighbouring components and cause partial shorts.

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What was the end finding? I have one doing the exact same thing at the moment but voltage never goes over 0.55 on PPVDD_GPU on iPad Air 2. Usually stays around 0.


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