i had the same problem with  mine i found four dry solder joints on the board the only prob is i can only describe where it is as i cant remember what it was!
remove rear cover and as you look down onto the component board around the 5 and 6 o clock posn there is a component around an inch square with 4 soldered legs try looking around there .just ad a solder iron to re heat the joints your components board unclips anyway and can be slid  out BUT MAKE SURE YOUR SET HAS NO CHARGE LEFT IN IT BE SAFE . i am in no way what soever an electronics whizz so i am  sorry i cant be any more precise.  also before i attempted my repair i found that putting preasure on the scart socked made the fault temp dissapear good luck
                
 mick the gyp
                
 August 2008