ipad mini 4 wifi, tristar keeps failing

have an ipad mini 4 wifi,
came in for unable to turn on, dead
using usb ammeter. no charging amp
open the ipad, while disconnecting the battery and usb charge 5v, testing the battery connector i get unstable fluctuating reading 1.2-1.4v
from my experience, it is the tristar. proceed to change.

ipad able to turn on and charge. left it to fully charge but to my surprise, the tristar dead again.
change the tristar ic over and over but same thing happened. any idea?

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