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Ok, so no picture or audio?
There is a fault with the power supply board inside the TV - it will need to be replaced.
Is this something you plan on repairing yourself?
Yes, well at least you are still within the 2 year warranty period so any repair or replacement is free :)
They will try to tell you that, however all electronic goods purchased anywhere in the UK or EU come with a minimum 2 year guarantee - you may need to inform Tesco about this as they may not be aware of it, but you are protected by this law:
The cost of this type of repair is typically around £100 to £150 for the board and £50 to fit i t.
Thanks very much, have a good day!Pete.