Mine did not work, it acted like it was being touched everywhere, I had to figure it out or go without, I figured it out, Its simple enough to take apart.
Remove the bottom of the laptop, T5 torx screwdriver or... a tiny flathead filed down to fit cause I didnt have one... Once bottom is off the hinges are plainly visible.
Yes, that is MY Q550LF, I am certain. Notice the hinge says "N550JV-SL" I know that the Q550 and N550 share many of the same components, like the keyboard. So the N550JV screen may be a contender.
Remove the screws holding the hinges in place to make a little room for the black cover that goes over the wireless antenna, it slides to the side a little then comes off easy, if it doesnt come off easy you're doing something wrong.
You know, the plastic cover that goes over this area, where your vents are.
Once that is removed there is 2 Phillip head screws, they are plain as day cant miss em, take them out. Once the two screws are out put your thumbs on each side of the screen, the black areas, like you are grabbing something thats flat... I dont know how to describe it. Anyways, slide your thumbs down, towards the base of the laptop. 1/8 inch movement and boom, ready to take off bezel, digitizer and LCD.
Now that you are here you can disable the digitizer and make your laptop useable again, if it was not useable like mine was. all you need to do is disconnect these two ribbon cables that come out of the bezel around the glass at the top of the screen, by the webcam.
Both of those
Then you can go ahead and put it back together. Cause like Asus said, they dont sell them in "North America"
Or you can go all the way like I did, not recommended. Anyways now that you have glass, digitizer and LCD in hand there is a small amount of glue holding the LCD to the glass, very carefully, dont use anything sharp or hard and do NOT bend it too much, but grab the LCD and peel (without bending) the LCD away from the glass, then you have this.
I actually ran mine like that for a while, then I put the glass back on. Works fine, no touch screen though.
Using the part number off the the actual digitizer itself I was able to find one for sale
Digitizer part number
Close up of digitizer part http/tinypic.com/r/2vhu2k7/8
The one I found for sale, I cannot read
Here is an added pic of my Q550LF taken totally apart to replace the keyboard. The entire top plate is the keyboard shell, so if it goes bad, like it has for many you need to take every single component out, motherboard, everything. Fun times.
Now when you call Asus swearin at them, give em one for me too. Good luck. Im always willing to answer questions. Posted from my q550lf