Iphone – not wake up from sleep/standby mode – iphone mobile software or hardware issue

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Iphone – not wake up from sleep/standby mode – iphone mobile software or hardware issue

On January 25, 2015, Posted by , In iPhone, With Comments Off on Iphone – not wake up from sleep/standby mode – iphone mobile software or hardware issue

Hi,Problem is that when iPhone 4 go to Standby/sleep mode it is impossible to turn it on.


It doesnt happen all the time, and I cannot tell when exactly it happens.
But it happens a lot. and mostly after phone stays in standby for more than seconds..

So you get iPhone Along with black screen.. then it is even difficult to make a hard reset sometimes..
(when phone turned on all modoules function well)

What should cause this problem? What to check in the Logic board?
Thanks

No Comment so far:

  1. ExpertBuddy says:

    what iphone model is that?

  2. ExpertBuddy says:

    Forgot to wote – iPhone 4 (gsm)

  3. Wela says:

    if sim free iphone …restore to factory ..not custom..

  4. TechGuru says:

    Tried all software solutions include clean restore (Along without restore from backup or from iCloud)

    Also tried 4.x firmware.

  5. Wela says:

    Im ever fixed 2G – 3G – 3GS Along with deep sleep which came from h/w problem. The signal from baseband cpu to weak-up the AP_PMU when sms – call was faulty. But can weak it up by botton press and show missed call or sms in on screen after weak up.

    Let check AP_PMU_EXTON signal connectivity. on prevoius model they have OR gate to combine others signal but i4 it go direct from U9_RF to U48_PMU_AP. It may fault from broken line of leak from corrision if not 2 IC suspect to be replace.

    goodluck,

  6. TechGuru says:

    have same problem iphone for not have anywhere water damage or corrision but when is sleep mode than make want reset for open tryed software update everting nothing bcs hardware problem a little raining than this problem but pbc very very clear not have anywhere water

  7. julianz says:

    yes problem resolved

    problem was power managment units

    rehot a little than everything is okay

  8. ExpertBuddy says:

    what exactly do i want to rehot? I have 3G Along with deep sleep (it only wake up when playing iPod).

  9. ExpertBuddy says:

    reball pmic changed bb flash and bb processor but same problem

  10. julianz says:

    HELP! I have the same problem.
    Iphone 4 (GSM)
    when the screen is locked iphone suspended.
    on the charger is operating normally

    I did: restore,replace dock usb,battery,flex power

    any solutions ?