I have a Mercedes E550 w212 2009 and I bought a 10 inch screen system Android and worked all the functions but there is no sound and when the factory screen is also not sound
It is also proven to install fiber optic
MercedesMedic 8 months 2 weeks ago
It's because the car uses fiber optic for the sound. You will have to bypass the stock amplifer and find a way to connect the Android HU to the speakers.
ali1411a 8 months 2 weeks ago
But when you restart the factory screen too, the sound does not come back even on the oem screen!!!
The reason why the sound is not working is becasue either the fiber optic cable is damaged or one of the systems is down. It could be the amplifier, head unit, CD changer etc.
The other possibility is that there is a fault code on the COMMAND module that was stored and now the system needs to be reset.