How to check the 6 RCA Input channels in a Speaker

[AnishSimon]

I am having F&D 2300X 5.1ch speaker and there is two input modules 1 AUX (1 RED and 1 WHITE RCA Connector)
2 DVD 5.1 - 6 RCA Input (FL & FR, RR & RL, CE & SUB)
I have 3.5mm to RCA converter cable and while connecting to the FR & FL ports there is sound coming from the speakers.
But If I am connecting to other four ports under DVD 5.1ch Port (RR & RL, CE & SUB) there is no Sound Output.
I was checking the cables working fine or not? I have 3 cables (3.5mm to RCA) and all of the three cables is sound output while connecting to FR & FL only.
I have a doubt that my Speakers (RR & RL, CE & SUB) inputs are working or not. Can any one help me out why it is not producing sound while connecting tot the above ports?

 

[americanaudiophile]

Do all the speakers play if you connect to the aux input and select a surround sound mode?
If that did work then the speakers and amps work so the problem may be the input jacks or circuit board.
If that did not work then it could be bad amplifiers in the HT or bad speakers, Connect the each speaker to the front speaker outs that do work. If you get sound some of the amplifiers in the HT are bad. If not then the speakers are blown.