iPhone 6 no power - Hot power ic

Collapse
X
 
  • Time
  • Show
Clear All
new posts
  • caphair
    Badcaps Legend
    • Nov 2011
    • 1249

    #1

    iPhone 6 no power - Hot power ic

    Have a water damaged iPhone 6 that's been cleaned of all corrosion, however upon applying power the power management ic gets really hot and I measure 100mv to ground on all the surrounding smd caps

    I'm wondering if there's an easy way to determine if the ic itself is shorted or one of the smd caps?

    It's so tightly knit that simply unsoldering wouldn't be easy and the ic is BGA

    The power ic is highlighted in yellow
    Attached Files
  • ReeceyBurger123
    Never Give Up !
    • May 2014
    • 7325
    • Britain

    #2
    Re: iPhone 6 no power - Hot power ic

    Possibly water under the bga chips shorting it out. Maybe try a reflow see if it helps ?
    Please Do Not PM My Page Asking For Help Badcaps Is The Place For Advise, Page Linked For Business Reasons Only. Anyone Doing So Will Be Banned Instantly !

    https://www.facebook.com/Telford-Tel...7894576335359/

    Comment

    • caphair
      Badcaps Legend
      • Nov 2011
      • 1249

      #3
      Re: iPhone 6 no power - Hot power ic

      Hmm it gets so hot I'd imagine any water under there would be dry

      Comment

      • stj
        Great Sage 齊天大聖
        • Dec 2009
        • 30997
        • Albion

        #4
        Re: iPhone 6 no power - Hot power ic

        dont iphones have underfill-resin on the bga's like nokia first started?

        Comment

        • caphair
          Badcaps Legend
          • Nov 2011
          • 1249

          #5
          Re: iPhone 6 no power - Hot power ic

          Yes they do, would that prevent any water getting under there? Isn't underfill used to hold components in place during soldering?

          Comment

          • caphair
            Badcaps Legend
            • Nov 2011
            • 1249

            #6
            Re: iPhone 6 no power - Hot power ic

            Here's the section of the power management ic I'm looking at. Most those caps measure shorted and trying to figure out which one it is or the chip.

            However the diagram is a bit confusing, are all those caps tied to the buck section?
            Attached Files

            Comment

            • fzabkar
              Badcaps Veteran
              • Mar 2009
              • 772
              • Australia

              #7
              Re: iPhone 6 no power - Hot power ic

              All the buck regulators appear to share a common supply. The fact that the chip is hot while its supply is low (100mV) would confirm that it is the chip itself rather than a capacitor that is responsible for the overload.

              Comment

              • caphair
                Badcaps Legend
                • Nov 2011
                • 1249

                #8
                Re: iPhone 6 no power - Hot power ic

                Originally posted by fzabkar
                All the buck regulators appear to share a common supply. The fact that the chip is hot while its supply is low (100mV) would confirm that it is the chip itself rather than a capacitor that is responsible for the overload.
                Thank you for that, wasn't sure how to determine exactly if it was the ic itself

                Comment

                • caphair
                  Badcaps Legend
                  • Nov 2011
                  • 1249

                  #9
                  Re: iPhone 6 no power - Hot power ic

                  Do you know the difference between vcc_main and vcc_main_s in that diagram?

                  Also what would the "desense" caps be?

                  Comment

                  Related Topics

                  Collapse

                  • Tynan Dill
                    Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?
                    by Tynan Dill
                    I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.

                    Upon bringing it home and plugging it up, it showed a standby light.

                    I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.

                    The screen seems to blackout and stay black, but with a flashlight I can see the display.

                    With my Playstation 4 connected via HDMI, and running a game I can hear sound.

                    Assuming...
                    11-22-2024, 01:46 PM
                  • PantherDave
                    Microsoft Surface Pro (5th gen) model 1796 - no power
                    by PantherDave
                    Hi all!

                    I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅

                    I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
                    https://www.badcaps.net/forum/troubl...-hardware-devi...
                    05-29-2024, 02:01 PM
                  • GLISIT
                    Asus Probook P5440UF-XB74 power issue
                    by GLISIT
                    Hi all,

                    TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!


                    I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!

                    A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about...
                    01-16-2025, 02:29 PM
                  • sam_sam_sam
                    Desoldering gun station modified to use a 18 volt @ 20 amp switching power supply
                    by sam_sam_sam
                    I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump

                    One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy...
                    03-31-2024, 02:12 PM
                  • sam_sam_sam
                    Tankless hot water heater controller board not powering up when power is applied
                    by sam_sam_sam
                    I recently bought a used tankless hot water heater and the controller board is completely dead no power up when power is applied the display board works however the main controller board does not work correctly at all the fuse is good

                    I bought a used replacement controller board that also had issues that I was able to fix and now the tankless water heater works correctly now

                    However I would like to know if I could figure what happened to this controller board if possible

                    Tomorrow I will take some better pictures of both side of both boards

                    The...
                    12-09-2022, 09:14 PM
                  • Loading...
                  • No more items.
                  Working...