H743Zi2 Board


Author Message
KeepIS

Guru

Joined: 13/10/2014
Location: Australia
Posts: 715
Posted: 02:08am 27 Jun 2019      

This is not looking good:

I compared the two boards and checked the voltages on the USB +5v switch.

Both boards use the same parts:

Both SS switches have exactly the same voltages applied to the inputs.

Pin:

1: USB V-out 0v on V2 (+4.8 on V1)
2: GND
3: Fault 3.27v Active low.
4: Enable 3.27v
5: 5v in 4.8v

Output is connected correctly to USB socket, no shorts.

Again Both V2 boards are the same.
It's all too hard.