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Old 01-09-2019, 06:29   #1 (permalink)
kapuzta
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Join Date: Oct 2015
Posts: 5
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Iphone 5s no power

Hello,

I have an Iphone 5s board which was shorted. The shorted component on VCC_main is removed.

STAGE 1: After promt to boot the result was stable 0.05 A on DCPS and not recognized by the PC.

Power rails what i have measured:

PP_VCC_MAIN - 3,8 V

PP_BAT_VCC - 3,8 V

PP1v2_SDRAM - 0,01 V (Diode mode shows "353" = no short)

PP1V0_SOC - 1,0 V

PP_CPU - 1,0 V

PP_GPU - 0V (Diode mode shows "309")

PP_1v8 Always - 1,8V

PP1v2 - 0,01 V (Diode mode "383")

PP1v8_SDRAM - 0,07 V (Diode mode "624")

PP3v0_SDRAM - 0,20 V (Diode mode "629")

PP3v3_USB - 0V (Diode mode "520")

STAGE 2: PP1v8 RESET L was not present but not shorted also.

I did removed the display IC for the reset line - Phone started to boot nicely was like 0,1 - 0,5 Amps and then suddenly 0. And now it wont boot at all.

Suddenly the PP1v8 line is not present - Diode mode shows "1700" something.

These diode result's looks a bit not normal - right ? Should be like 300-400 ?

And also after the promt to boot all the power rail's are missing (but in diode mode does not show the short circuit - showing like "1230" and moving up.
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