Hello everyone,, I have this equipment that only turned on once, then it didn't turn on anymore, at the source I have 7.5v and I also have 3.3v on the front plate I appreciate how mobdro lucky patcher kodi much help you can give me with the repair

Diagrama aquí:  https://elektrotanya.com/sony_hcd-gpx3g_ver1.0_sm.pdf/download.html  Otra link para la descarga del diagrama: https://www.electronica-pt.com/esquema/audio/sony-audio/sony-mhc-gpx3g-22417/ ¿Enciende el indicador de Stand by? Verificar el buen estado de TODOS los interruptores del panel frontal.  Alguno de ellos en corto circuito bloquea la acción de encendido del dispositivo