Hi I have a 5 / 6 year old Beovision 3 that is making a humming / buzzing noise.

It only happens once the tv has warmed up after half an hour or so of being on.

The humming / buzzing seems related to the picture because when the picture stays on a frame for a while the noise starts but when picture changes to another view the noise stops, starting again a minute or so later.

Anyideas on what problem could be and local repairer near Fetcham in Surrey ?

Check this out:

http://www.repairfaq.org/sam/tvfaq.htm

I think your problem is described somewhere in there, plus a remedy.

Good luck!