I had the exact same problem - This is the solution:
The problem is three faulty capacitors which are easily found when you take off the back of the tv. unscrew the middle board and look at the top right hand corner and you will see one capicitor clearly numbered 2662 (1000µ/25V) and two smaller ones 2663, 2664 (both 100µ/25V.) - go to your local Maplin or equivilent and they supply these 3 capacitors for about 65p! solder them in and youre fixed !
Dan Weaver, September 2007