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PCB problem KBD8X MKII


Guys, the problem is that the PC does not see this board, there is no sound on and off the device, I measured the voltage 5V, it is on the controller and on the LEDs and on the contacts for the switches. I just found this board among my stock and decided to build it, the board is new, it used to work, but now it is just dead  :(


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