I had a similar problem after updating with a SONY BRAVIA.
To solve the problem I finished up using the following sequence ( to cut a long try and test method short )
1) Press the
Menu button on the remote control
2)Go to Settings
3)Select Channel Set Up, then use the right arrow on the circle above the
menu to go to the list on the right
4)Go down to Manual Programme Reset
5)Select TV System and Press the
center button on the circle above the
menu to display the systems
There are 4 systems listed on mine which are
BG, I, D/K and
M.I found that on the channels with no sound they where on one of the last 3 (in my case )
After comparing the settings on the ones with sound and vision I noticed they where all on BG so I changed the ones with no sound to the same selection ( BG )
I found the sound was restored and the problem solved on my first channel so then went through the rest and did likewise with the same positive result.
Not sure if it will be the same in your case Denz but worth a try.
If this doesn,t help post and i,ll do a reset on mine and re check the sequence.
I cannot do it at present as the wife is watching the soap on channel 9
Good luck anyways
marshbags
