quad lnb and diseq 4,1

[chuliu]

I had 2 dual lnb pointing to 124e and 128e (i am in asia). Each of the output of the two dual lnb is connected to a diseqc 4,1 and the output of the diseqc is connected to one of the two receivers.

Now, with the same layout, I just replaced the dual lnb with quad lnb, and add one extra receiver, and a 4,1 diseqc.
Port 1 is connected to 124e and port 2 128. All of a sudden, all the horizontal transponders have zero signal.
I thought each of the output of a quad lnb works independently and it should work as expected.

Can someone shed some light as to this problem?

[echelon]

sounds like you bought a quattro lnb and not a quad lnb