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What is the model of your Sony TV?
Hi I am still here it cane take a while for me to respond however.
Right so if your not seeing any sign of life on the TV it would suggest the PSU (power supply) could be at fault, however most TV's dont have a PSU this is normally built in.
However without the model number I can confirm, however based on the part number of the PSU I would suggest you check the voltage output with a multi meter, and if there is no voltage replace the adaptor, if there is voltage then look at the main board on the TV itself.
70% of the time it will be the power supply based on this issue, if you pop down to a local TV repair with the adaptor they can test it for you, and probably order you a replacement.
Otherwise you could go to ScrewFix and pick up a multi meter for around £15.
Let me know how you get on, and if you need anything further.