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I have a Samsung model # HL-R5667W, when I first turn on the set the lamp comes on but no picture. The stand by / temp light comes on, does not blink, and after a few minutes shuts off. If I unplug the tv for a few seconds and plug it back and turn on the power everything works fine for as long as it's on, once I turn it off and come back later to turn it on the same thing happens. I changed the lamp and reset the hours and it still does the same thing. What could be the problem, I also cleaned the dust from the back of the set but since this happens when cold I doubt it is a heat issue.

If you can see that the lamp turns ON and you still dont have a image, most probably your DLP chip is bad, this is a very well known issue with Samsung's. Please check the following info:

http://www.youtube.com/watch?v=eD_xZcYQE50
http://www.dlp.com/technology/how-dlp-w ... fault.aspx
http://electronics.howstuffworks.com/dlp1.htm

After reading this you will comprehend that the DLP chip stops working and all of the micro-mirrors are on the OFF position.

The last picture on this link shows you the enclosure of the DMD board
http://www.discount-merchant.com/PhotoD ... =SKU110235
Apparently the part # of the DMD board is BP94-02217B