About one of the causes "Service not found" or "no signal". If the box doesn’t display a bootlogo (black screen) on the TV during the boot process, and then doesn’t find the signal from the satellite, this is most likely due to corrupted information in the flash memory. In this case, it is a good to reflash the box with a mark of bad blocks or to clear the flash memory in the programmer and mark bad blocks, but this does not always help for a long time. The best is to replace the flash memory chip with a new one. Thus, I repaired several DV500HD, DM800HD, DM800HD SE devices.