thread: ipad 4 no power
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Old 09-15-2018, 11:51   #5 (permalink)
willipad
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Join Date: Sep 2018
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thanks for your assessment.

Shortly before i started to unsolder the capacitors, i gave the board a last try.
Surprisingly the behavior changed, now i get

PPVBUS_PROT 4.8V
PPVCC_MAIN 3.46 V stable
VDDQ=VDDCA 1.93 V
VDD2 1.01 V
VDD1 1.79 V

and the A6X Chip is hot
and the PMU (U8100) is very very hot

the iPad is still unresponsive at the display and the pc
the switching noise is gone by the way

do you think i should still unsolder the capacitors?

i will have a look at such usb meter, now i can say, that the power supply heats up a little bit
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