How can I fix my Sound-4 car cd player?

I was listening to my fx116 Sound-4 branded car cd/radio (3 year old) when the digital lcd front display went blank and sound died. The motorised control tray still operates ok and I hear a slight hiss from speakers but no display. Can switch player on and off via soft touch button. Cd will play but only soft distorted sound from speakers when volume turned right up. Checked antenna ok;speakers all ok-correct ohms; no fuses blown. Anyone got any advice on how/whether worth fix??;