QUOTE(FrostyTheSnowman @ Dec 1 2009, 12:38 PM)

Unfortunately there are known problems with XBOX VGA and most LCD TVs in general.
LCD TVs don't fully support standard VGA signals, and the XBOX doesn't produce 100% compliant VGA signals either, so it's usually really hard to get it to work with an LCD TV.
Also, VGA doesn't really look any better than component when used with a TV. VGA only looks better than component when you use it with a real VGA monitor. (LCD or CRT)
Have you tried your Frozen Cable on a real VGA monitor yet?
As it turns out, the actual AVIP connector was not seated in the plug very well (the metal jacket that gets plugged into the back of the xbox) -- it could move freely forward and backward within the plug. As such, it wasn't making a connection with the AVIP jack on my xbox.
I took the plug apart. I looked everywhere for some advice on how to do it, but I the best advice I could find was on the xbox-scene tutorial for making a vga cable where it said "Holding the end, pull the metal section out (may be stiff)." Well, believe me I tried pulling the metal jacket out of the plug (it should be possible unless it's crimped onto the wires too tight), but I could not get it to budge. I even used some pliers to get a better grip and tried working it back and forth, but eventually I gave up. Now that I know it's possible, I might stick with it longer and try some different tactics if I ever need to again; but, I just cut a couple slits along the right and left side up to the back of the plug so I could sort of pull it apart. The good news is that the metal jacket is quite durable.
Anyways, if you're having problems similar to mine (flashing green and yellow when using a frozen cable), I would check the connector first and foremost, and make sure it is seated firmly in the metal jacket. It should only be a few millimeters away from the front of the jacket; not flush, but almost.
Just wanted to give an update to everyone and hopefully this will help someone else if they are experiencing similar issues. It was very frustrating because I couldn't find anyone else who was having a similar problem. I couldn't find any instances of someone experiencing flashing green and yellow when using the frozen cable. I was thinking that something was wrong with the circuitry in the frozen cable, but it turns out that the flashing yellow and green (which indicates that the a/v plug may not be seated correctly) was exactly right. The circuitry inside of the frozen cable is fairly simple, and, to my knowledge, is pretty much the same as the tutorial given on xbox-scene (with the addition of digital coax audio), so there's really not a whole heck of a lot that can go wrong in there. However, who would really think that the problem was a physical one with the plug itself? I mean, those things are mass-produced and I haven't especially heard of a lot of problems with them at all.. I guess one of them slipped through QC.. Sometimes the simplest problems are the hardest to solve because they aren't common.