Rapid battery drain and front mic doesn't work

Question

iPhone 6s

2015년 9월 25일 출시. Model A1688/A1633. 수리는 이전 모델과 유사하며 스크류 드라이버 및 비집는 도구가 필요합니다. GSM 또는 CDMA / 6, 64, 또는 128GB / 은색, 금색, 스페이스 그레이 및 로즈 골드로 제공하였습니다.

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Nikki @nikki3791

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Rapid battery drain and front mic doesn't work

Hello! I’ve got an iPhone 6s with two (I suspect) motherboard-level issues: 1) incredibly fast battery drain; 2) a non-functional front microphone (used for Siri and speakerphone calls) with quiet sound, sometimes static, and sometimes fully working audio after recording audio for a few minutes.

I tried replacing battery multiple times, but it didn’t help — this 6s goes from 100% to 1% overnight! I also tried replacing front camera flex cable (the one with front camera, ambient light sensor, and a microphone) but it didn’t help either. In both cases, I did multiple replacements: two batteries and three front camera flex cables.

I know that I’m looking for a motherboard-level repair now, but before I go to the repair shop, I’d like to know what kind of repair I should be looking for. For battery drain, I believe I’ll need to replace the Tristar/U2 chip, but I have no idea when it comes to the front microphone.

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Chris Stables @imicrosoldering

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I don’t think this would be a Tristar issue. It sounds like you have a partial short on one or your power rails probably from a faulty IC maybe Tigris or speaker Amp but it is hard to say without taking measurements and knowing the phones history.

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Thank you, Chris. The only thing I know is that this phone fell into the snow for a few minutes (two years ago), and I had to dry it as some of the water got into the speaker grid. I also used non-MFI charging cables, but I doubt those could mess up the phone. iPhone's motherboard looks perfect to me, no signs of water damage whatsoever.

Nikki 의 2020년 3월 10일

@Nikki Hi Nikki, I have a similar problem to yours, except my 6S has no sound at all. I also replaced the battery and had the Tristar replaced but to no effect. could you please let me know what the problem was exactly? it would be much appreciated thanks

kelbrenna 의 2021년 3월 29일

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Thank you, Chris. The only thing I know is that this phone fell into the snow for a few minutes (two years ago), and I had to dry it as some of the water got into the speaker grid. I also used non-MFI charging cables, but I doubt those could mess up the phone. iPhone's motherboard looks perfect to me, no signs of water damage whatsoever. — Nikki
@Nikki Hi Nikki, I have a similar problem to yours, except my 6S has no sound at all. I also replaced the battery and had the Tristar replaced but to no effect. could you please let me know what the problem was exactly? it would be much appreciated thanks — kelbrenna

iPhone 6s

Rapid battery drain and front mic doesn't work

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