Video out problem

Yesterday my daughter bought a new component cabinet. When we wired up the components including the JVC RX884V receiver, she attached the yellow RCA video cable into the red RCA audio jack on the receiver. Now we do not get a picture on the TV when attached through this receiver. I do get a picture when connected directly to the DirectTV box using the coax cable. I have tried the S video cable also, again with no luck. What could have blown in the receiver? Are there any fuses in this receiver that could be checked? What do you suggest I do next? How expensive might it be get the receiver repaired?

Thanks,
John