I just recently encountered the same problem with a Sony Bravia KDL-46EX500. It started out of nowhere but after what seemed to be an update from the cable company. The volume would go down to zero and the LCD light on the front of the TV would continually blink. After trying many "solutions" including resetting the TV to factory defaults, , I removed the batteries from the cable universal remote (Comcast Xfinity) and used only the TV remote and the TV worked fine. When I reinstalled the batteries into the Xfinity remote, the problem started again. So I tried using some of the other codes listed for Sony televisions and found that an alternative code (10273) would also control the TV but not reduce the volume automatically. So, in short, try looking for a different, usable code for any universal remote that you may be using - it may be the problem.
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Common for control switch on the side needs pushing in a few times as this controls volume as well as the remote could have fault try to remove batteries in remote as well as a test. If not please provide model number of the TV Middle back of the TV for this information.
The main system control memory IC to this TV is damaged. Replace it. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Have you looked to see if the Button on the tv itself is stuck in. Press it and you might be able to feel for it sticking. If this is the case you may want to try a baby wipe or something similar to try and sort this out. (dont use a sopping wet cloth)
The volume on either on your Remote or Tv is stuck down. This can be caused by spilling Liquid onto the remote (we all do it) you can test which one it is.
take the battery's out of the remote and turn the volume up via the Tv volume button on the telly. If this stays at the required Volume Then this means that the - volume button is stuck down on the remote. Try and clean it with something like a baby wipe or something similar (not a sopping wet cloth) If this does not work then you may need a new remote.
perhaps the volume down button on the TV is stuck. It could be either physically stuck, or the electronic logic could be messed up. Just to rule out a problem with the remote, take the batteries out of it and then adjust the volume at the TV and see what happens.
I am having same problem on 32 inch same problem. After playing with board with no results,I tried front buttons and found that if I held the power button in ever so slighItly as not to turn it off, it fixed problem which is the micro on/off switch, I removed the switch and used the remote and everything is back to normal, I am about to insall a used micro switch after I finish typing this but I am sure this will clear up volume problen and menu going crazy problem if not I will just leave micro switch out and use the remote, and I will get back to this board only if that micro switch still causes the problem, so if I don't post in next hour the problem is fixed and I'm more than glad to help.