All these sets have a DM unit, when set is unplugged and plugged back the green light should blink for about 70 seconds and then stop--when it stops you can turn the set on.
This is the DM unit booting up like a computer--fyi, not a good idea to do this on too regular a basis.
If this told you something you did not know, rate this solution as very helpful as I do this here for free.
SD TECH
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Diagnosis: If none of the above test resolve the issue, then the failure lies in one of the following:
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