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Hi Bob, you've going to need to get the back off and get some voltage readings, start with the power supply, go by the legend on the board, let me know what you find, and I'll give you some advice on what to test next
If you are using the box for signal to the set unplug it for a while and then plug back in to let it reboot--may or may not solve the problem but easy and worth trying. Do the same with the TV if you want.