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This problem is likely due to some components on the power supply circuitry that have failed.
Over time, electrolytic capacitors can dry up or leak, so they don't work as well once the TV has warmed up.
A TV repair tech can carry out some tests to locate the faulty components and replace them.
They will normally charge around $150-200 for this service, as it is quite time-consuming.
You may want to consider investing the money in a new TV instead, as you could get a new one in the sales for around the cost of repairing your old one.
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