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iPhone 6 No touch.

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  • iPhone 6 No touch.

    I have an iPhone 6 board, no history of repair. no drop. it has no touch.
    replaced Mason and Cumulus. and even replaced U2403, but still no touch,
    Resistance mode reading on connector is all same on zxw. and pluged my known good LCD on it already.
    cant seem to figure out whats wrong. Alson it has no LSD.

  • #2
    Did you do the m1 jumper and check other long traces coming into meson ?.

    Comment


    • #3
      Nope since its an iPhone 6 I did no see the reason in doing an M1 jumper., do I need to make one?

      Comment


      • #4
        No, M1 is not a signature problem for the 6. Do you have your touch voltages present at the connector?

        Comment


        • Alber_the_Learner
          Alber_the_Learner commented
          Editing a comment
          I am curious about the M1 jumper. Just new to that! I'll google it...

          Jessas, Where can I read about the signature failure of iphone 6 and 6s?

      • #5
        Ah sorry I misread I thought it was a plus. I'd still diode mode any long lines just to rule them out.

        Comment


        • #6
          yes it has voltages, but i cant seem to compare them to a know good it seem to be way different.

          Comment


          • Jessa_the_Professa
            Jessa_the_Professa commented
            Editing a comment
            What is different? Differences between a bad board and a known good board are where you should focus for sure.

        • #7
          You need to know if they have the right voltages (as jessa said) as a small voltage drop can cause issues with touch, on zxw there is a solution list i cant be sure but i think there is voltage readings on there for the connectors. These are users readings so mite not be completely accurate (if at all, but neither is zxw) this mite point you in the right direction for now though.
          Also need to check the voltages to the IC's to see if they are correct im sure i have seen them in the solutions list before to. Good luck

          Comment


          • #8
            There is 0.00V on PP5V1_GRAPE_VDDH, Tested C2433 on my multimeter on DC mode.
            Base on my analysis on schematics PP5v1_grape_vddh is from chestnut. Will try to replace it ang will give guys an update.
            Please do correct me if I'm wrong..
            Last edited by GHI888; 01-21-2018, 10:40 AM.

            Comment


            • Jessa_the_Professa
              Jessa_the_Professa commented
              Editing a comment
              Look at the schematic--is C2433 on PP5v1_grape?

            • Alber_the_Learner
              Alber_the_Learner commented
              Editing a comment
              hey friend! Jessa pointed you to a important question...

              C2433 is NOT on PP5V1-GRAPE. It is on the PP_CUMULUS_VDDANA which is 1.2V. C2402 is on the PP5V1-GRAPE.

              I am assuming that either you wrote down the power rails names, switching them, or you made a mistake... double check what Jessa asked you...

          • #9
            Replaced chestnut still no touch, and still no 1.5V on c2433, I compared to a knowd good it should have 1.5V on c 2433

            Comment


            • Alber_the_Learner
              Alber_the_Learner commented
              Editing a comment
              See my previous comment... C2433 is on PP_CUMULUS_VDDANA (1.2V)...

          • #10
            So what can happen to your 5v1 to make it 0? One idea is that there is an open line—what are other possibilities and how can you rule them out?

            Comment


            • GHI888
              GHI888 commented
              Editing a comment
              Bad Chestnut?

            • Jessa_the_Professa
              Jessa_the_Professa commented
              Editing a comment
              Let's clarify something---we need pp5v1 which is a chestnut output in order to have touch. Forget about the other touch power lines until you have 5v1 grape. Do not measure for 5v1 grape on caps that are not on that line. Let's solve one problem at a time.

              I asked you: What can happen to your 5v1 to make it 0v---you need to confirm for us that you are actually missing 5v1 since you listed that you measured it on some other cap on a different line.

              Assuming that you don't have 5v1 and it is 0---where did it go?
              My suggestion was "maybe there is an open line" That's one possibility
              You suggested "maybe bad chestnut" That's another possibilty---but let's put that in a broader category "chestnut is not working---because of any of these: Chestnut is not getting power, chestnut has internal damage, chestnut is not being told to turn on, chestnut is missing its required cap that makes it work, chestnut has bridged lines under it, chestnut has corrosion under it---all of these are possiblities that are just "chestnut is not working" but don't necessarily mean that chestnut is bad. You have already changed chestnut so you've ruled out 'chestnut is bad'

              What is the third major possibility? Hint--what is the opposite of an open line?
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