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Hi John, how old is the TV?
The fault suggests the main board which controls the TV is developing a intermittent fault causing the TV to come back on by itself.
A typical cost in terms of parts is around £50, your then looking about an hours and a half's labour, so the repair would be around £120.
If you would like me to recommend a local firm who can give you a quote and replace the faulty part please provide your postcode.