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Open the back of the TV,and look at the can shaped items on the boards.If any of them have the tops,or bottoms bulged out,they need to be replaced.This should get it working again.I hope this helps.If you have any questions,please let me know.Thank You very much!
Power supply most likely... It's a common problem with this particular model and we've seen quite a number of them for exactly what you're describing.
You need to replace 19 caps in the power supply 4) 3300uf/35v, 8) 2200uf/25v, 6) 1000uf/10v, 1) 1000uf/16v and you can go a little higher in the voltage of each cap for greater reliability.
It's best to have an ESR meter also and test the remaining caps as well.
I'm surprise to see the repair shop telling you there nothing they can do.
The power supply can be fix if you take the time to troubleshoot it. However this is not a DIY project.
The failure is in the capacitors that are bulging out of the top or bottom. Quite visibly defective.
4- 3300uf @35V 8- 2200uf @25V 7- 1000uf @10V 1- 1000uf @6.3V 3- 100uf @25V