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Das iPhone 6 Plus mit dem 5,5 Zoll Display ist die größere Version des iPhone 6 und seit dem 19. September 2014 auf dem Markt.

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Black screen and stuck in recovery mode after reflow on touch IC

This phone had touch disease.

I flowed a little Amtech flux under the touch ICs and gave it a little heat. I didn't go crazy with heat. Just enough to get the surrounding components molten. Did not touch anything and board was taped down with kapton.

Upon connecting the battery and USB I get a black screen. CPU gets warm.

PC recognizes the phone in recovery mode. I tried restoring and it says "software for this phone is not available" and it is also not detecting the serial number.

I have tried a few different recovery programs to kick it out of recovery mode, but it is not detected in these programs. Only in itunes.

USB amp meter says it immediately starts pulling 0.5A when I plug it in, which is the max of the USB port. Did I create a short somewhere?

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Ist dies eine gute Frage?

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hallo any have iphone 6s dfu allweys go to sw mode

von

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Hi Matt. Sorry, I accidentally deleted my original answer (I clicked delete instead of edit).

Seeing as how you are well equipped and experienced, the only thing I can see is that too much heat was applied, despite the careful steps you took. At this point you need to check all of the surrounding components to see if anything came loose or if there are any solder balls laying around.

FWIW, I personally don't recommend reflowing IC's on iDevice logic boards. The component density is too high and the actual pcb is too thin. The heat flows very quickly and the chips that are secured with underfill are particularly susceptible to solder ball merges or explosive expulsions.

Once you start applying heat, it has to be for a specific purpose. In the case of Touch Disease, you should only apply heat when you intend to replace them. Don't forget that a portion of the CPU is directly opposite the Touch IC's.

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No problem.

Unfortunately I think it's the CPU. PP_VAR_SOC is short on the CPU side of the inductor. I have already removed all 8 caps and the short remains, so it looks like I am out of luck.

This phone was rough to being with. It took some major trauma because the original screen was absolutely destroyed. Maybe I just pushed it over the edge because I was rather gentle with the heat.

Oh well, it was for education only. I learned an expensive lesson.

von

What did you measure on the CPU side of the inductor (in terms of resistance)?

von

0.01 ohm, which is the resistance of my meter leads.

von

Yeah, just checking :>). Sometimes people get confused with the continuity beep thinking there's a short.

Have you removed the inductor to properly check for a short on the CPU? That's the proper way to do it.

von

Yes, inductor removed and the short is on pin 2. I think I am out of luck.

von

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Why are you reflowing? That is only a temporary fix and it's going to just go bad again in a month or so.

It can also cause more problems like Minho said.

A better solution is to reball the chip or replace it.

The reason behind this is because the solder balls are lead free and when rebslling it you can remove the old solder and use leaded solder.

If it's a temp fix for data recovery purposes then I understand.

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Matt wird auf ewig dankbar sein.
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