IPad won’t power on
I have an iPad Pro (a1584 12.9).
the device will not power on and my usb amp meter goes to 0.9 then back down to 0.
when the screen is attached there is small backlight flicker but nothing more.
0.9A is normal charging current for iPads. If drops down to 0.0A in cycles it can means there is a short circuit on loading path or power ic has a problem. Change the "lightning" cable original first. If it doesn't get better, you have to take it apart and see what's going on inside.
Such iPad problems can come from different origins and affect several different sub-systems. It will be crucial under what circumstances it happened for the first time. If you know microelectronics and can solder, check and replace the usb regulator (1610a3) then the DOCK tape. If not, find a good repair service.
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