My girlfriend iPhone 6S is not charging, and for what I have searched the problem is related with the Tristar IC (U4500).

I already bought the U4500 component and I have all the material necessary form the replacement.

For what I have searched about the problem that I mentioned, the only thing that I need to do is to replace this Tristar IC (U4500) (but if I’m wrong, I appreciate if anyone cloud clarify me, on other possible reasons for this problem).

With that said I have a few questions that I would like to know the answers before try anything with the iPhone.

What temperature should the soldier station be, to remove to Tristar IC, without cause unwanted damage to other components?
How much flux should I apply to avoid damaging other components?
In the removing process how long (seconds or minutes), should I inflict heat to remove the IC chip (an approximated time)?
When heating, my movements should be circular around the spot, or as steady as possible focusing on IC?

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