I had the same problem as you do. I'd check these "test" images.. so I started to see yellow... I have samsung lcd... so I was worried, but...
So I downloaded many Hires wallpapers (nature photos) and a tried to see any yellowish in them. All of them were so beautiful.. (even compared to a CRT monitor!!!)
So I decided to keep it... no problem since.
Anyway, I always have something on my screen and it never just plain grey, so I don't see any problem
🙂
FYI: i used this site to get many wallpapers to try:
http://interfacelift.com