Samsung HL-67A510
First thing I would try is to remove set and a box or receiver if used from power for a while and then plug all back up--should reboot all units that way--cannot hurt and may very well help. Not just the set but any unit between signal source and set.
It might also be a good idea to see if when the screen is black if the lamp can be seen--is it on or not?
SOURCE: Samsung 54" rear projection PCL5415R Won't Turn On
Although I am not incredibly familiar with your model, There is most likely a small board mounted above the others near the crts, there is a small red connector with a blue wire if you unhook it it will remove power from the convergence IC's and if they are shorted it might come up with conv out, will need a new module.
SOURCE: I have a Samsung hl-r6768w 67
Go online and order a new color wheel. Take yours out first to see if that's the problem. Found mine on line for $101.00 shipping & Tax included.
SOURCE: Tv picture freezes then goes black 10seconds later HL-R5067W
Sounds like the digital board needs replaced.
SOURCE: Samsung DLP TV HL-R5067W green vertical bars on screen no picture
This is going to be a bad digital board. It is a very common issue with the HLR series.
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