I finally found reason why my DM800 won't boot with DVB-S2 module.
There is at the bottomside of module one later added component, electolytic capasitor. It should be soldered in three other components on board. When I was looking module carefully, I noticed thet there was MISSING SOLDERING.
So, I added little soldering paste this missing point, put all parts of DM800 back together, flashing it with latest image and IT'S ALIVE again.
This was my solution for this problem. Hope that this helps others too.
Note: This is for printboard revision J, in revision K there is not this later added component.
Happy HD-year 2009