My LG TV is set-up in exactly the same way as your LG TV when it comes to HDMI-related configuration. I had a good poke around when I first hit the issues with the 5000T. I suspect that the age of my soundbar might be the root cause of the problem, but as it works fine with everything else plumbed to it I'm not minded to change it until it finally gives-up the ghost.
When my builder has finished the extension that he's building for me I can get my second system up and running again, at which time I'll grab another 5000T along with a Lindy HDMI blocker. Some of the posters on Digital Spy swear by the Lindy adapter. For now, given that Manhattan remote control channels can't be changed, a second T3-R is off the cards, so it will have to be another Panasonic lump, if I can find one new. Sigh.
