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Repair information and guides for the iPhone 6S released by Apple on September 25, 2015. Models: A1688, A1633

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iPhone wont charge with original cable and its discharging very fast

So I bought iPhone which came with original battery that said it had 80% health but I could use it maximum 30 min and replaced it with replacement battery but life on this battery isnt very good either. If I leave disconnected from charger at night in the morning its dead so even when its not doing anything its discharging. When the battery drops below 25% its start to lag and its unusable actually and sometimes this percentage at when its starts to lag varys, also now it lags when it has 60%. Does anybody know what could it be?

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Sounds like charging chip if it wont charge with original cable (make sure that cable works on another iPhone) but the lagging sounds like bad quality batteries.

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Do You maybe know the name of that chip?

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It would be called U2 Tristar charging IC

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Thank You very much! I found that some people replace U4, do You maybe know what he is?

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Tristar failure is a really good candidate for this problem, or you may have some corrosion on the logic board that is causing a partial short resulting in a low level current leak. Either way—these are microsoldering problems and it is time for a trip to your friendly local microsoldering/board repair shop.

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Well I was thinking of replacing it myself because I do know to solder with hot air gun so maybe I will give it a try on broken phone first then on my, thank You!

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Electro Discover will be eternally grateful.
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