Behringer UMX 610 with problem/defect (com problema/defeito)

I bought a Behringer UMX 610 that came defective. When I turn on the keyboard, the lights come on loop without stopping. However, the lights should only light up when the corresponding button was pressed. ------ Comprei um Behringer UMX 610 que veio com defeito. Quando ligo o teclado, as luzes acendem em loop, sem parar. Entretanto, as luzes só deveriam acender quando o botão correspondente fosse apertado.