Sounds like either corrupted firmware or something went bang in a memory or controller chip, you could try a factory reset if you can find your model number on the samsung website. If you haven't tried this yet: unplug the power plug to the TV for about 10 minutes and then try again. Sometimes this will allow the caps to drain and clear any temporary faults.
Usually a factory reset involves holding buttons on the remote while pressing the power button etc. You should be able to find instructions on how to do this with your model number. Samsung generally is pretty good about this stuff being available.
SOURCE: my samsung TV model
there may be no 5v to the microprocessor,also check for dry joints. this could eliminate this problem
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