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iphone 7 red screen error21

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  • iphone 7 red screen error21

    no wd no fall damage, nand voltages present. short bootloop, restore ends with err 21 and red screen sometimes. charges fine so no tristar issue. ideas?

  • #2
    I tried with a known good case, assembly, lcd with sensors and brand new battery so it is not a part issue.

    USB Lighting power consumption is 0.84 amps with screen off

    Squid consumption is 0amps while off, 0.7/0.6 amps while on

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    • #3
      Reballing audio ic did nothing
      REPLACING the ic made it work again. Waiting for the code from customer and then I will see if the bb still works..

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      • #4
        Is this the disabled one? That would suck if it was...

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        • #5
          Did you use leaded solder on the replaced audio or straight up lead free?

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          • #6
            I always reball brand new chips with leaded. I keep them in a pill box ready for use. Especially audio ics. No way I will risk the heat needed for unleaded with the Intel baseband right on the other side.

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            • #7
              And yes it is the disabled one.. No data recovery. Just an overpriced repair.. Really demoralising

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              • #8
                So the leaded solder reduces the chance that the error 21 clearing was actually heat-based changes under CPU or BBCPU. Interesting.

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                • #9
                  Yeah. Looking carefully I saw that one of the pads on the chip itself is missing.

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                  • #10
                    What line was the pad for?

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                    • #11
                      pad c1 on zxw pp1v2_vd_filt

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