Hi
Thanks for using FixYa. From what you have described it seems the issue is with the some components that have gone bad on the power supply board however, it can only be checked once you open the back of the set and blow all the dust off then start by checking the power supply unit for swollen/bulged capacitors and burnt wires/components on the power supply board of your TV. Please do accept the solution if the issue is resolved or else revert for further assistance.
Thanks
Rylee
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