"Equal to" means you have exactly the same hardware hooked up to the tuner. For Solo2, to use internal loop through, the signal wire must be hooked up to Tuner B.

You have not fully described the hardware connected to the tuner. Is it a single universal LNB? Do you have any diseqc switches or splitters? Are you using any face plates? I presume that you have checked F-plugs are fine. And lastly, sometimes, the PSU fails and it cannot supply the required current for the tuner. Are you able to test another 12v PSU?