1708 no power due to MCU board

[APintoZ]

Hello,

I have a 1708 controller which doesn't power-up when the guide button is pressed. I checked and everything is fine with the button/power board, and when I replace the MCU board with another one it works fine. So, the problem is with the MCU board. Does any of you have a hint on where to start? Thank you!

AP

[RDC]

Inject 3.3v into that MCU board on the 3.3v rail and see what gets hot first. If it's a Cap, remove it, then try it with the top board again.

[APintoZ]

Thank you! I'll look at the schematics and find the 3.3v rail and try!