I have two Samsung tv's, I can't recall their model numbers - but one is a 600 series lcd and one is a 400 series lcd.
I have discrete inputs for component 1, and component 2 input for each programmed into the mx 500's, and I have an old radio shack JP-1 capable remote (but no jp1 cable).
I thought it was a pronto neo, but it was a boston tsu501
[Link: remotecentral.com]
I used this method previously to derive the discrete input selections, but the Boston TSU501 died and was disposed of.