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On these older JVC surround receivers, when the sound cuts out to "nada" (zip), it occurs when the speaker output transistors fail. These are soldered onto the output PCB and then thermally coupled with heat sink grease to the internal heat sink in the receiver. So, this can be fixed - and it would entail a technician to de-solder and mechanically remove the old outputs from the unit and then replace them with new ones. Unfortunately, the average cost for this type of repair generally hits close to $175 parts and labor, which is quite a bit of money for this receiver (keeping in mind it can be replaced with a brand new model for almost the same cost).
However if you'd like to inquire about repairs, or seek a 2nd opinion, you can use the link below to locate a shop in your area:
Alternatively, an entry-level surround receiver - like the Sony at the link below, can be purchased for right around $200, and might be money better spent in the long run:
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