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iPhone 7 Only Boots when cooled, Charging Flex Audio Problem

So this is a very strange problem that I have never faced before:

The iPhone 7 does not boot up (Apple Logo appears forever...) expect I put it in the freezer for 10-15mins.

I have already swapped the battery but the problem appears.

So if I boot up the phone in normal temperature, it won't boot up properly, you can feel that the home button is working, but the apple logo won't disappear and so the phone is stuck in a boot loop.

Disconnecting the battery, reconnecting it again, placing the phone in the freezer for about 10-15mins and start it, there are no problems and the boot goes clean and nice.

Also there is another issue:

Charging works perfectly, but the phone does not recognize the lightning headphones at all (of course I tried several different headphones and also the lightning-aux adapter)...

ALSO: When swapping the charging dock flex, the issue remains, so its not a hardware problem with the charging dock flex cable.

Does someone know a solution to this combination of issues (I know its very exotic though)

Has someone ever had this on his iPhone 7 before?

Would be very happy for some answers.

Thanks in advance guys! <3

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Can you test phone calls and check if microphone and earpiece speaker works?

Also test if mic is recording in voice memos.

Want to rule out audio IC being the fault but it looks like it most likely is the audio IC.

The audio IC suffers from a flexion based defect on the logic board.

Basically the connection between the chip and board goes bad over time then will need to be replaced and some weak connections fixed with jumper wires when the board is subject to any form of stress even normal use due to Apple's bad internal design of the phone.

This is also because these chips that are BGA (Ball grid array) mounted on the board are soldered with non-lead solder making it very susceptible to flexion based damage.

When the chip is replaced, leaded solder will be used to make sure this issue does not happen again.

If you don't have the tools or experience to do board-level repairs / microsoldering you will need to take the phone to someone that does those types of repairs such as a reputable repair shop that offers a no-fix no-fee model.

More info about audio IC defect on the iPhone 7 here:

https://www.youtube.com/watch?v=kHRfpHa4...

A damaged Tristar charging chip can also cause the long boot loop issue but since you managed to get it booted by freezing the phone it means the issue is from a loose connection which the tristar does not suffer from.

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There is no sound when I record a video. Actually recording is not even possible, when I press "record" it immediately stops.

Also when im tryna record a voice memo, it won't work.

Anyway, music playback via Spotify is working!

Does that affect the Audio IC?

So it definitely seems like the Audio IC chip is dead...

Is it really possible that this defect prevents the phone from booting up?

Why does boot up when its cold?

por

Because cold causes the solder balls under BGA chips to contract having a affect on the connection sometimes making it work temporarily.

Anyway yeah pretty much audio IC.

por

Ok. I know somebody who can fix the Audio IC.

You think this will fix the boot issue as well or just the headphone issue?

por

Should fix both at the same time.

por

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