Iphone 6 dead, where to start?

i have an iphone 6 which died one day after the lcd where changed, suddenly.

I connected it to my amp-meter and mostly its nothing but sometime, it draw 0.49A and top side its getting too hot. Its very fast than its shut down

I checked U1202 but there are missing test points.
PP_VCC_MAIN : good
PP3V0_TRISTAR: missing. Is that mean u1202 is dead?