I have here 10 SB that burn

I have here 10 SB that burn out, 2 of this burn the LEDs the other burn the alegro chip.
The problem is that i don't understand why, i don't use the 5V jumper, i'm waiting reply from Garrett.
in the mean while i'm reverse engineering the SB sheme, maybe i have pointed out a possible issue but i have to investigate better.
Hope to have a quick reply from Garret, i need the SB but i need also reliability

Alessandro

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