New 3DS noise from speakers

MaRC5

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Hi people.
New 3DS motherboard without rust and traces of liquid when turned on, there is noise from the speakers and the buttons and touchpad do not work. Only the right analog stick and the Home, ZL and ZR buttons work. It turns out to enter the recovery menu via L + R + Up + A, but after entering, neither the touchpad nor the buttons work.
I inserted the board into another fully functional 3DS - everything is the same. Where to start checking?
 
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