I have exactly the same problem but found two work arounds, either one that I am completely satisfied.
1. unplug and replug the AC.
2. I have a subwoofer, when I plug the subwoofer cable half way in, the sounds of the base speak goes back to normal (but not all the way in)
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Just a couple general ideas. If it is a used car then the head unit is possibly failing. Another possibility is resistance building up at the connections. If you can clean the connections, plugs and slipons with electronic spray, erasure, and fine sand paper if accesable.
Your surround capability is 5.1. Although there is a front panel function button, there appears to be no other buttons to program your unit without the remote. Find your remote or replace it. Ebay is showing replacements at what I consider a low cost. The Sony model is RM-ADU007. Failing that and considering the many remote functions required for you unit, would be a Logitech Harmony replacement. The Harmony remote also comes with a USB patch cord because the user must go online with Logitech to program the remote for your unit. It would be best to the Harmony website prior to buying to make sure it covers your model.
I had the same problem and was able to repair it quite easily. Only thing needed is some basic soldering skills.
Suddenly a quite loud and disturbing (scratch/screech/buzz) noise appears.
Sometimes the noise is gone but it reappears sooner or later.
Changing volume or radio band / input (am, fm, aux) does not affect the noise (even on volume turned down all the way).
The signal coming out of the Headphones / Rec Out plug is not affected.
Cold solder joints
Unplug from mains
Remove back panel (the two black screws next to the plugs in the
center). The back panel sticks quite firmly, so it might help to remove
the front panel first (the 4 screws in the corners) and carefully press
out the back panel from the inside. (The other two (silver) screws are
used to attach the transformer to the back panel) and need not to be
On the circuit board at the back panel locate the plug that goes to
the speaker (is says "J2"). Check the solder joints. In my case, looking closely, I could see that they're not good anymore.
Renew the joints by heating them up and applying some fresh soldering
tin. I also renewd the joint from the wire bridge next to the plug. Just
check the other solder joints on the board.
In my case afterwards the problem was gone and the device is working properly again.
I've had mine for nine (9) years and it fine, first make sure all coloured wire are connected to the sub correctly, press sys on your remote then press button 8 to test if the speakers are working then increase the volume to hear the spaekers. so to link TV audio/sound with DVD press sys then A-2 on the DVD remote, I hope these will solve ur problem?
Does your radio have a sleep button or option? If so, check to make sure that you did not set it on accident or with out knowing. Or if it has batteries, check them to make sure they aren't dead or mixed with old or new.
Any speaker has the potential to be used as a computer speaker. The problem you will run into is what will be used to power the speaker. Typical computer sound connections do not put out a strong enough signal to power a full sized speaker on their own. If you hooked the computer to an amplifier and then to a speaker it would work fine. If you do this, I recommend using the line out connection on the computer instead of the headphone connection.