Hi, I've been having a persistent problem over the last month or so, I've been having rows of blocks appearing on-screen which affects the picture quality, most notably on Cartoon Network HD and Nickelodeon HD.
I've ran a DTV Medic test on my VHD box and it said there's an attenuation problem on the RF test. I haven't seen any issues on my main TiVo box and all my connections are tightly secured and have rebooted my set-top box several times which doesn't cure the problem.
My DTV Medic Case ID is: 4967980