iPhone 4 touch problem 18v missing – iphone , Assistance needed please help

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iPhone 4 touch problem 18v missing – iphone , Assistance needed please help

On January 23, 2015, Posted by , In iPhone, With Comments Off on iPhone 4 touch problem 18v missing – iphone , Assistance needed please help

Hi kindly read my post then answer me . iPhone 4 touch controller not getting 1.8v its missing even I change PMIC still no 1.8v coming out from PMIC to touch controller ..
If anyone solved this kindly reply urgent thanks, in advance


Regards

No Comment so far:

  1. ExpertBuddy says:

    did you change Y1_PMU?

  2. newComer says:

    Already, problem is 1.8v missing, I thought its due to PMIC I changed y1,then PMIC still there is no 1.8v near touch controller ,If there is 1.8v present then its 100% touch controller want reballing .

  3. julianz says:

    gud luck…carefull for too much heat,,under it is the wifi ic

  4. Wela says:

    I dont want to change touch controller ,thats what iam asking here when youch controller not getting 1.8v then where is the problem already changed Y1 and PMIC

  5. ExpertBuddy says:

    i havnt encountered like this 1.8 missing from b2 to R14..try to replace your touch ic controller,,dont want reball replace it and check for results

  6. newComer says:

    Check what voltage do U have on C460_PMU (PP1V8_GRAPE) should be 1.8V if YES check continuity from C460_PMU to PP17, R16 (0.1ohm so U can jumper it), C198, C200.
    If NO 1.8V on C460_PMU then take out PMIC and check continuity from B2 ball to this cap if it will beep then faulty PMIC.

  7. TechWorld says:

    Last step is CPU A4 after you make sure everything is normal. Missing some voltage supplies to touch IC, LCD… CPU A4 can cause even they come from PMIC directly. Many power supplies from PMIC are controlled by A4. I solved many times by reballing A4. Good luck guy

  8. julianz says:

    Good luck Along with that. I hope you finally have it repaired and all.

  9. newComer says:

    not solved I cant replace A4 ,and I did every thng …Please read my previous post and if anybody got solid solution kindly post … Many thanks