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Iphone 6S troubleshoot: One time it turns on and after 2 min it reboots or goes out completely.  Gives 0.057A on Power supply after it goes out and turn it on again.  Battery and charging connector already replaced.  3.7v on battery connector on the motherboard, so tristar is good. Further no water damage, Iphone is in very good conditioneel. Can someone help me?

Do you have access to the schematics for the phone? You can purchase a subscription for 69dollars for 1 year and it has all of the iPhone and most of the iPad and I believe Samsung also. You can buy it at ipadrehab.com and they will send you an access code and you can have the schematics up and running in less than an hour.