Singstar microphones don't work?

I have been a Singstar for Playstation 4 for a long time and when I wanted to sing again recently, suddenly only one microphone (the blue) of four went. So now I have two red ones and one blue ones that don't work and I don't know what to do. Maybe someone has an idea?

These are not exactly high-quality microphones.

Check the cables for broken cables

Or replace it with sensible microphones