OK no problem, Gerry.
I'd like to focus on what you said earlier... "the only way to switch it on is by turning it on and off at the mains socket which can take anything up to 20 minutes to work."
That's really important. Specifically, the "up to 20 minutes" part of your statement is really indicative that we have a failing power supply circuit, inside the TV.
The power supply circuit's job is to take the mains AC voltage and convert it to DC voltage for the TV to use (this is called rectification
). It also filters it, stabilizes it, and divides it for the different circuits inside the TV.
There are quite a few different components in that circuit... transformers, resistors, coils, capacitors, transistors, etc.
Over time, the components degrade and begin to fail. Usually this is because the power supply circuit is "always on" whenever the TV is plugged into the mains (even if the TV is turned off).
OK, long story... I'll get to the point.
You need to have the power supply board replaced. Yes
it is almost always financially viable to get this fixed. Even with the TV's age, this is a nice TV... no need to throw it away unless you really want
to replace it.
So, get a hold of a local engineer and have them confirm the diagnosis and replace the board.
Alternatively... I'm happy to help you do it yourself! All you would need is some basic hand tools (screwdrivers) and some patience. Let me know if that's something you're interested in, OK?
I hope that answers your question! If not, just let me know. Also, please take a second to rate the service I provided today, as that is the only way I receive credit for answering questions here. I hope I was excellent, even if the news was not! Thanks!