Welcome! What's going on with your computer or...

Welcome! What's going on with your computer or device? Hi good afternoon. I have a jbl boost tv speaker which I've been using for a year now and all of a sudden it went off. The technician I took it to told me the parts are not available. The part I need to change is the PCB he said. How can I buy that part and where can I order it from since the parts are not available? What programs and versions are you using? It's conected to my tv. It's a compact tv speaker Dolby sound. Anything else you want the computer expert to know before I connect you? I want to get the part which is the PCB so I can get it repaired.