5 year guarantee only guarantees they wont do anything! once john lewis stood for great service now its a shameful shambles. After just 2 years my £900 TV started having intermittent black screens when watching TV. I first contacted sky who replaced my box, but that didnt help. They then advised i contact LG as there is a known fault. i did this and they confirmed it was known and sent an update. that also failed to fix the issue. This is when i contacted JL who sent an engineer who also confirmed this was a known fault. The ussue is with the silicone used on this specific model. JL has done everything they can to get out of responsibility, including blaming apps on the TV. Even though the sky box has been replaced, and the reason for the issue is known to be with the TV, JL is still insisting I get a full diagnostic report from Sky on the box. Then they only said it "may strengthen my case". I keep getting different information and palming off. It comes to somthing when Currys look like saints in comparison to John Lewis!