Iphone Tristar test homemade

Incopia2

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#1
The tristar is a IC in iphone motherboard, this ic have a control to charge battery and others functions.
may be iphone work ok, but no charge battery.
¿How to know if the problem is tristar IC or battery?

We can make a homemade tester to check this.
Buy a iphone charger cable
 

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