Hi Pete, welcome to Just answer .... how old is it ? do you hear a click sound before it turns off ? any flashing lights on the TV ?
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Thank you ... the flashing light is a code to tell the tech. what is wrong with the TV ... in this case 13 flashes indicates a communication failure between the main board and power board of the TV..if one of the board is bad then it will cost around £150 in repairs ... if you are good with DIY skills you can unplug the TV then take the back off...locate the power board and main board...remove the power supply and connectors on these board one by one then plug it back again... sometimes it works... this is only recommended if you know how to use a multimeter.