The 3 blink code indicates that the lamp door is not secure. If you havent removed the door then its probably the switch for lamp door sensor.
I would remove the lamp door and then reinstall it. Do this with the set unplugged then plug it back in and check operation.. Basically sometimes the lamp door switches become dirty and by removing and reinstalling the door it usually corrects the problem..
If this doesnt work then you will need to either have the set checked out by a tv technician or you can try replacing the switch yourself. But as I said normally just removing and reinstalling corrects the problem.. Good Luck!
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