I've just bought a new one.
The one that broke we got from Tesco just over 2 years ago. When it broke, I called the Tesco electrical helpline to see if there was any point in getting someone to try to fix it. A very helpful chap took me through a series of 'things to do to check it out' then decided that it was a dead TV. He then sent me a form to fill in to send to Customer Services . They wrote to me asking for a copy of my receipt (which I still had as they tell you to keep it for the normal guarantee). I sent that in and within a week or so, they sent me a lovely and totally unexpected cheque for £120 as the TV should have lasted longer than it did. We paid £300 for the TV new and had not taken out the extended guarantee , we never do as we think it's far too expensive.
SO, Result! and guess where we will be buying our next TV ?