For Comcast Cable Remote the code is 0463 which happens to be listed in the comcast literature as the Sansui code, for what it's worth.
I found this by using the written instructions under "Searching for your code" to find the code. Follow the instructions but MAKE SURE TO COUNT how many times it takes for your TV to turn off because you will likely pass it up on the first try. Leave the cable box off! Just turn on the TV by hand and do the 9-9-1 thing and alternate between the TV and Power buttons counting 1-1, 2-2, 3-3, and so on. If you pass it up, you can quickly go thru the steps again but SLOW WAY DOWN when you get close to your number. My TV was the Insignia NS LCD-26A and it was the 62nd code I searched for so it is a bit of a bummer when you pass it by, that's why I say count every time you try a code.
OK, so your tv finally turns off and you hit the setup button and that locks in the code. Now follow the instructions under "Checking the codes" and it works. This gave me 0463 as previously noted.
