iphone 4 no backlight board damage cap missing ios version issue how to solve its hardware issue

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iphone 4 no backlight board damage cap missing ios version issue how to solve its hardware issue

On March 29, 2015, Posted by , In iPhone, With Comments Off on iphone 4 no backlight board damage cap missing ios version issue how to solve its hardware issue

Hi i have 2 iphone 4 both have no backlights i have changed the coil and ICs on both but they still have no light but on both there is damage to the board there is a cap missing and on one side were the cap was solder too the pad is pull off do you think this is why there is no light?.


thanks.

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No Comment so far:

  1. killu says:

    An update on this cap it is 177_pmu on the iphone 4 schematic i tested pin 2 and there is no power going to it. I dont think this cap has any thing to do Along with no power going to pin 2 on the lcd connector when this was pull off the board the link must have been broken Along with pin 2 somehow.

    Help kindly

  2. chugowa says:

    Try this jump.
    /

  3. tavenger52 says:

    Thanks so much for your to be helped and pic Wites, Yes i was going to do this jumper after testing the output volts from the backlight IC next to that big cap which was ok so after testing the continuation from the IC to pin 2 it was 0hms. So wanted a jumper wire done on it.
    Hope this to be helpeds someone out if they get this cap pull off the board.

    thanks again Wites

  4. TechGuru says:

    i have iphone 4 its water damage i had done service there is no shorting but mobile is still off Please to be helped me

  5. Wela says:
    Quote:
    tatarabraham63
  6. ExpertBuddy says:
    Quote:
    santosh0002
    i have iphone 4 its water damage i had done service there is no shorting but mobile is still off Please to be helped me

    check the coil right next to the power IC

  7. wagny says:

    i have an iphone witch lcd back light blink and brightness not working.