Ok, well that is unfortunate...
The only problem that causes NO blinking lights at shutdown is a bad main fuse, or a bad DMD board. Since yours comes on, that rulesout the main fuse.
If it is the DMD board then usually the TV will stay on for a while, then just shut off on its own as if it was shut off, only the cooling fan won't run for the lamp.
If it were a temp sensor there would be specific blinking lights, same for the lamp, ballast, power supply, video processing. All have blinking light error codes.
Here is a link to the part you need: http://www.partstore.com/Part/Samsung/Samsung/HLR4667WXXAA/Samsung/Samsung/BP9600678E/New.aspx
Now you know why I said it was unfortunate
Hope that helps in some way...
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