A regards to all you excuse my English but me I live in italia, a problem with my dm500 cinese, tuner BSBE1-703A, channel not found. Pin 5 ok 30v!! I have replaced the tuner with one new. It works only on some trasponders independent from the polarity' V/H. Rai 1 ok, rai2,ok etc Transponder alone sky some channels. How can I resolve this problem??? Thanks you excuse my English!!!