I actually bought an LG especially because of it's RS-232 support
But, once you have a serial port, you're not out of the woods yet!
I just bought a serial to usb converter, only to find out it's a male USB out and a male serial-out! But these televisions also only have a male out. Joy!
Even finding a male-to-male usb cable (for the TV's service port) is impossible in Belgium, I've only found usb extension cables or, when both ends are male, they're never the same type (those mini usb connectors for camera, those square connectors for devices) As long as they can squeeze money out of us for every product we buy..