Get the manual and familiarize with the setup and troubleshooting instructions.
http://www.retrevo.com/support/JVC-TH-G30-Home-Theater-Systems-manual/id/20067bh042/t/2/
No sound. The system cord and/or speaker cord is not connected. Check the connection.
The audio cord is not connected to AUDIO IN (VCR)
and/or DIGITAL IN (DBS) correctly.
Connect the cord correctly. (A pg. 13)
An incorrect source has been selected. Select the correct source. (Apg. 17)
The decode mode is not set correctly. Select the proper decode mode. (A pg. 35)
http://www.retrevo.com/support/JVC-TH-C5J-Home-Theater-Systems-manual/id/318ag518/t/2/
Do you think the powered subwoofer itself might have a power problem? Check its cord.
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