In this aspect the device might be working and every other components are perfectly OK but there is no sound production.
These are the possible solutions to the sound problems
first of all check the speaker cable whether its well connected to the audio output and input terminals of the speakers. Check the volume controller button if it is turned down,check the mute button and lastly check the sound integrated circuit(I.C)
This is the part that controls the sound system of a Radio set.It is located inside the cabinet with it heat sink that regulates the temperature.you can get from the local electronics shops. this is where an expert comes in and is advisable to visit a technician when it comes to i.c fault.