dobly

I have a DM500HD connected to a Sony DN1050 amp. I watch FTA French TV on Eutelsat 5.0W [on 11591 V 20000 QPSK]. Up till April all was OK. Since then I get both Video and Audio on France 3, but Video only for France 2 and France 4. In the About menu, Service, PIDs, the Sound PID shows N/A...