I've been trying to enter the service menu on my 47LM7600 but I can't... I have 2 universal remotes, an RCA, and one from a pansat Sat receiver.. after using code 10856, both remotes are able to turn tv on/of, change channel, and adjust volume, however if I try holding down 2 or 3, it says unit must be in TV mode, so I go to TV mode and all 2 or 3 is doing is changing the channel... did the recent firmware update kill the service menu entry?