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Thanks for the reply. I swapped LNBs and had the same issue. For the ground block, do you mean the connections to it, or the block itself? Anyone else have a guess to narrow it down further? Thanks, David

Hello. I've been through other threads and I couldn't find one for this exact problem. Hoping someone can help me. Background info: DirecTV, oval dish has room for 3 LNBs, but there are only 2 in place (middle isn't populated). Each LNB has two outputs. Coax connected to all 4 LNB outputs...