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Erratic charging and restarts after sound ic repair

Guys im lost here. I have done a lot of iPhone 7 and 7+ sound ic, guessing around 100, the thing is, for some, the following happens

1 iPhone will boot normally, albeit a little slower.

2. Sound that was not working before works perfectly

3. It does not charge properly, it starts ok at normal amps then drops to 0, the battery % jumps after every reboot and sometimes when the iPhone is being used.

4. The battery shows as maintenance, with no health meter, the battery before had like 90% health.

5. I have tried new charger, new battery, turned it on off the hosing, redone the sound ic fix 4 times and still same problem.

6. I have had this problem like 5 times and one time it solved itself when I put all these screws etc back. Others when I redid the sound ic

Any help to what the !&&* is going on will help a lot guys, thanks for you're time.

Update (01/27/2020)

SOLVED!! It was the battery connector, i removed the plastic middle part exposing the two metal connectors for SWI, added some solder also and it worked perfectly! hope this helps other that may have this issue.

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Still the problem persists guys… if anyone can help would be great….

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Its time to look at charging circuit than. Tigris, Tristar and charging fet.

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Without seeing your soldering technique it would be hard for me to tell you where to look. You have said that this has happened about 5 times before which makes me think you should change your audio IC procedure.

Are you reballing the IC’s?

·         If you are tilt the chip up and make sure all the balls are even.

·         Are you using solder wick on the IC,s?

·         Have the chips got small nicks in them from tweezers.

First thing I would check is the VDD boost line. Are you getting any current draw before prompt to boot?

How many jumpers are you running? Have you checked D12 and G12 pads it might pay to run a jumper between those. Erratic battery percentage would point to BATT_SWI line although I have seen a partial short on VDD_BOOST cause this problem.

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Chris thanks a lot for you help, Im pretty good at micro soldering, have done a lot of jobs since I started after doing the class with Jessa at ipadrehab.Are you reballing the IC's? ---- no I don't reball them, I buy them from mobilesentrix.

· If you are tilt the chip up and make sure all the balls are even. ----- yes they are even

· Are you using solder wick on the IC,s? ---- I don't wick the board

· Have the chips got small nicks in them from tweezers. ---- Some of them do, but I have done around 100 and they don't give me any problems.

First thing I would check is the VDD boost line. Are you getting any current draw before prompt to boot? I don't get it, but to test this is use the DCPS, it says 0 amps prior to boot.I just run the classic C12 jumper, never done any of the others.

The audio works perfectly.... What is not it the battery percentage and I restarts randomly.... The client took the iPhone with her, when I get it back I will test VDD_BOOST.

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Still having this really weird problem... if anyone has any ideias...

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I agree with Chris, have you checked R2201 next to the battery connector? Your symptoms sound a lot like the classic SWI line issue.

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danbedin estará eternamente agradecido.
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