Hallo i have a dreambox 7020 who does not supplies the lnb. No voltages, no 13 and no 17 volts. I suspect a SMD diode marked: in the first line: R13 in the second line there is a symbol (i think it is the F of fairchild) and then P731. I think them are shottky but can you give me any suggestions? Thank you in advance Slang