iPhone 4S power button problem – ios version issue

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iPhone 4S power button problem – ios version issue

On March 28, 2015, Posted by , In iPhone, With Comments Off on iPhone 4S power button problem – ios version issue

I have 4S Along with power button problem, it does not boot or draw any amp at all.
Boot OK Along with charger, even Along with charger removed.
Flex button OK. already tested Along with another good working board.
Shorting DZ11 Along with tweezer also nothing.
Remove DZ11 also nothing


Measured got 1.8v at DZ11.
HOLD_KEY_L line good, shows continuity on R56
PP1V8_Always shows 1.8v
PP1V8_ SDRAM Shows 1.8v
R57, R56 and R45 already checked, theyre good

Any advice ???

Thank you

No Comment so far:

  1. Wela says:

    Refer to my reply to you earlier today. If the BL and boot works from the USB cable, you either have a bad battery or harness issue.

  2. newComer says:

    @jkb78

    I have tried power it using bench psu, and when I shorted the DZ 11, it does not draw any current at all.

    I suspect the U8 could be the problem, but still trying to figure out how this work.
    Maybe you could give any hint bypassing the U8. Since I do not have any access to replacement part and avoid removing any component near CPU.

    Thank you

  3. ExpertBuddy says:
    Quote:
    jkb78
    Refer to my reply to you earlier today. If the BL and boot works from the USB cable, you either have a bad battery or harness issue.

    I was searching for a solution to the problem and your comment prompted me to check again. Turns out the power button connector had fallen under the board twice!
    So happy there was no fault.
    You can say it was carelessness, but Ill blame poor lighting. title=wink