Is this a Tristar issue?

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iPhone 7

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sean @sean27839

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Gepost: 13 jun. 2019

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Is this a Tristar issue?

So looked at an iphone 7 for a friend the other evening, came to me completely flat and not charging, initial look in the charging port showed obvious physical damage and 2 pins missing, my guess is he was trying to clean lint/fluff out of the charging port rather aggressively.

First port of call was to replace the charging port and upon completion the phone will indeed now power up, however as soon as it powers up it then sits there on 1% battery and wont charge, the phone will not go into DFU mode and is not recognised by itunes when plugged into a PC.

A USB ammeter shows that the phone draws a whopping 0.08amps when plugged in so as expected it does not charge. Does the above sound like a Tristar failure?

My current thought is that there was initially a fault with tristar or tigris resulting in no charge that caused my friend to aggressively attack the charging port and break it.

If this does sound like Tristar then any tips for a first timer in replacing it? I’ve not done any hot air work before though am reasonably handy with a soldering iron on normal sized stuff. Fro what I can make out you use a reasonable amount of flux and the rest is patience

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c9679 @c9679

Rep: 2,1k

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Gepost: 13 jun. 2019

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I would try another charging flex and a good battery first and look for damage around the charging flex after that… just plug the flex in without fully fitting it and test it, failing that if u do replace tristar replace Tigris at the same time as it's usually Tigris or the mosfets on the 7

The iPhone 7 requires quite a bit of heat so I've uve never used hot air before try to practice on another board first :)

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So ive ordered another charge port to test though im not convinced, reason being that the phone is not recognised by a PC or Mac, Ive tried a selection of cables with no luck. I'm guessing that if this new flex does nothing then it will be a Tigris/Tristar fault. I do have a couple of scrap boards, one from a 5s and another from an android phone I can play with first though im wondering if I should just send the board off and have someone else do it. My only other thing im questioning is that all other Tristar faults seem to show symptoms of a completely dead phone that wont power on at all!

13 jun. 2019 door sean

Always a good idea to follow simple steps

1, What's the history what exactly happened

Ok so it's not charging what was the person using to charge it was it an official plug and decent cable etc

2, ok so it's not charging cos u can see physical damage to the port, try a new port preferably one that's tested and u know 100 percent its working and dont fully fit it just plug it in and test it.

3, try a new port with a new again tested battery or at least one ur sure of.

4, look for other signs of damage and go back to the questioning of the person whose phone it was.

5, after all that then jump into changing the common chips

6, still not fixed look at other components that are responsible for battery percentage, charging etc...

13 jun. 2019 door c9679

The 7 does need a lot of heat and the tristar is a little tucked away under the metal shield which is next to the nand and just above tristar are mosfets that can be nudged so I would say send this to someone who can just fix it for u and practice on something else :)

I would say practice removing a few ics from the 5s and then putting them back on :) my comment was too long so I had to split it up lol

13 jun. 2019 door c9679

Just finished fitting another lightening port and now the phone is charging fine! seems the first one I got was either dead or I somehow killed it fitting it. Ill give it an hour charging then go see if itunes now recognises it

15 jun. 2019 door sean

Lol always rule out parts first :)

It might not just have been plugged in just right if it's not aligned 100% it doesn't fold correctly and if it doesn't fold correctly it never stays plugged in

15 jun. 2019 door c9679

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So ive ordered another charge port to test though im not convinced, reason being that the phone is not recognised by a PC or Mac, Ive tried a selection of cables with no luck. I'm guessing that if this new flex does nothing then it will be a Tigris/Tristar fault. I do have a couple of scrap boards, one from a 5s and another from an android phone I can play with first though im wondering if I should just send the board off and have someone else do it. My only other thing im questioning is that all other Tristar faults seem to show symptoms of a completely dead phone that wont power on at all! — sean
Always a good idea to follow simple steps

1, What's the history what exactly happened

Ok so it's not charging what was the person using to charge it was it an official plug and decent cable etc

2, ok so it's not charging cos u can see physical damage to the port, try a new port preferably one that's tested and u know 100 percent its working and dont fully fit it just plug it in and test it.

3, try a new port with a new again tested battery or at least one ur sure of.

4, look for other signs of damage and go back to the questioning of the person whose phone it was.

5, after all that then jump into changing the common chips

6, still not fixed look at other components that are responsible for battery percentage, charging etc... — c9679
The 7 does need a lot of heat and the tristar is a little tucked away under the metal shield which is next to the nand and just above tristar are mosfets that can be nudged so I would say send this to someone who can just fix it for u and practice on something else :)

I would say practice removing a few ics from the 5s and then putting them back on :) my comment was too long so I had to split it up lol — c9679
Just finished fitting another lightening port and now the phone is charging fine! seems the first one I got was either dead or I somehow killed it fitting it. Ill give it an hour charging then go see if itunes now recognises it — sean
Lol always rule out parts first :)

It might not just have been plugged in just right if it's not aligned 100% it doesn't fold correctly and if it doesn't fold correctly it never stays plugged in — c9679

iPhone 7

Is this a Tristar issue?

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