[]About 3 weeks ago while watching tv, the picture went green with lines
running across the screens. I couldnt change the channel, there was no
volume and only thing I could do was switch it off. After about 20
minutes the picture came back on and it was fine.....

Until tonight. Again same thing happened but this time it hasent fixed
itself. From reading other posts it goes on about CRT drive. Can anyone
clarify if this is the problem?[
color drive transistor in the crt socket is bad.i have the same problem as you have few months ago.and i fixed it by replacing the transistor.check the voltage under green.