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Can i use iphone 6 u2 on iphone 6s

Full disclosure, I have not tried using an iPhone 6 Tristar on an iPhone 6S. It may work as they are pin-for-pin compatible but I don’t know of anyone who has reported success. I believe it’s a question of internal specs and the iPhone 6S is more demanding so the 1610A2 may not last long. From a best practices perspective, the compatibility goes the other way around. You can check out this chart for future reference.

For future reference. The U2 IC is called a Tristar IC. U2 is its board position on the iPhone 5, where they first introduced the IC. Its not refered to as a U2 on any other phone but the iphone 5. iPhone 5 - uses the 1608A1 Tristar iPhone 5S/5C - 1610A1 iPhone 6 - 16101A2 iPhone 6S - 16101A3 iPhone 7 - 610A3B Tristar IC’s are backwards compatible, but not forwards compatible. So you can use the iPhone 7 tristar on every iPhone before it (except the ip5). For this reason, most micro solderers will only stock the 610A3B tristar now. As the iPhone 5 tristar is painful to do and not really feasible to repair unless its for data recovery.

You can not, it just does not work. Component specification is different, size and number of legs is similar.

yo he puesto de 6 en un 6s y han funcinado, al igual el del 7 en un 6s y 6