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Volume fluctuation problem due to old cable?

movieman
11-23-2007, 02:03 PM
I have a Sony KDS50A2000 projection and experience a very subtle change in volume (up and down) while watching random channels on TW cable. Could this be due to an old optical audio cable I used (maybe 12 years old) from my old set? Do these cables deteriorate? Also, can a service technician measure volume output on a testing device connected to the set (like an electrical continuity or flow meter)? This is an intermittant problem and I don't know where to look for the source. I also have two HDMI cables in the installation: cable box to tv & audio receiver to tv... these were RCA brand from Sears, not Monster.

daleb
11-23-2007, 02:34 PM
I have a Sony KDS50A2000 projection and experience a very subtle change in volume (up and down) while watching random channels on TW cable. Could this be due to an old optical audio cable I used (maybe 12 years old) from my old set? Do these cables deteriorate? Also, can a service technician measure volume output on a testing device connected to the set (like an electrical continuity or flow meter)? This is an intermittant problem and I don't know where to look for the source. I also have two HDMI cables in the installation: cable box to tv & audio receiver to tv... these were RCA brand from Sears, not Monster.

Connectors are the most likely to suffer problems in poor quality or mis-handled cables. Cable swapping is probably the quickest way to isolate a faulty cable and/or flexing the cable (carefully) especially near the connector. Generally you should hear some noise if it is intermittent when you flex it, etc.
You can do the same with a continuity checker and see if the buzzer (or reading) is intermittent when you move the cable around or jiggle the connections.

rbinck
11-23-2007, 02:43 PM
I've not heard of optical cables deteriorating, but they are not too expensive to replace anymore. Check out these: TendonUSA Cables (http://www.highdefinitionblog.com/?page_id=284) - scroll down to the Audio & A/V cables.