Hola y bienvenido al foro
Utilice un traductor como google si no puede publicar en inglés, para que otros puedan entenderlo mejor y así brindarle ayuda…
Hi and welcome to the forum 
Please use a translator like google if you are unable to post in English, so others can understand you better and thus provide help…
Below is the translation of his post:
Good evening, I am new to Linux and when installing Manjaro xfce it does not recognize my broadcom 43142 board, please if someone can guide me in solving the problem. It should be noted that my Notebook (TOSHIBA SATELLITE C45) does not have an ethernet connector.
Thank you very much.