Have you tried holding the TV button until it lights up. Press the power button and then press up until it finds your code?
Pick up a 21.0 remote from ebay. It can "learn" any IR device including your Emerson TV. I have an Emerson that I couldn't control with a 6.3 either. I no longer use the Emerson but I know the 21.0 will work. Good luck.
Ed
Thanks for the tip! I'll order one.