Help diagnosing a motherboard with no short
I have a iphone 6 plus that was given to me the phone has no power no display. I connect it to the power supply at 4V and and it draws .98 Amps then shoots down to 0 and stays there, because its not holding alot of amps and shoots back to zero i assume its not a short. So if i diagnosed correctly and i am not looking for a short circuit what else am i looking for. I am just getting started with diagnosing motherboards so any advice helps.
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