I have bought a dreambox 900 original the DTT tuner that I find original is OK, but when I put a tuner sat (I tried many dvb2 dual, trial, dvbs2x, etc.) it tune few channels. Where I can try the fault in motherboard? I try all the images dreamelite, gemini, openatv ecc. The same tuner and sat configuration is ok with a DM 920 that I have. Thanks.