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How frequently is it going on and off?
Right so the issue is intermittent, when the fault occurs do you see the standby light flash a number of times before repeating?
Secondly how long have you have you 48" 6500 series TV?
This would point to a intermittent hardware fault on the main board, it is possible the power board could be fault but would have expected you to have seen the fault more regular and see the standby light flash.
A new main board would cost around £50 in parts, I would suggest getting a Tv engineer out to fit it as they can test the power board with a multi meter, and verify its the main board is at fault before replacing it, as well as ensuring the correct main board is ordered (since there are a few variants on your model).
If you would like me to recommend a local engineer please provide your postcode.
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