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Тема: iphone 6 short on PP_CPU/1.0V

  1. #1
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    iphone 6 short on PP_CPU/1.0V

    hello

    I am working on the iphone 6 water damage and have pmu off the board and its giving me short a continuity on PP_CPU/1.0V with pmu off and short on the PP_BUCK0_LX2. i tested the solder points resistance to gnd on PP0301,PP0302 and i am getting 2.203k on both points. Can some one help me ? does cpu need reballing?

  2. #2
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    If pmu getting off and you have short circuit, first of all
    you need to test power rail

    Try to power this line with labaratory power supply
    Voltage recomended up to 0.5-0.7V
    Current limit 1-1.5А
    WARNIG
    If you choose wrong polarity, cpu will be dead possibly


    Water damage = some cap may be down on this line.

    After powering this line, you can simly to find bad cap (it can be heating)
    Thats all

  3. #3
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    console master thank you for your reply

    here is the thing with this phone. when i first got the phone it was dead, I found problem around c5202_rf,c5203_rf bad caps I removed them phone started to boot up but it was going on and off so I change the u2 ic because thats usually the problem if phone keeps on booting up and touch was not working. after i change u2 tristar phone wont turn on and lot of heat on the u1501. after removing u1501 i still got lot of heat on the u2401,u2402 which also a touch controller. I removed them because touch was not working from beginning. now i still have shot on PP_VAR_SOC/1.0V line, PP_GPU/1.1V, PP_CPU/1.0V, PP0V95_FIXED_SOC/1.0V

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    short circuit under cpu.
    only reball

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