I disagree. The procedure is so easy no Service Manual is needed
1) Remove ALL power. Remove the AC adapter, and Battery.
2) Open the laptop.
The plastic frame in front of the LCD screen is the Display Bezel.
(Gateway? Believe they call it the LCD Panel Bezel)
Down in the BOTTOM corners, next to the Hinges, are screws to be removed. One in each bottom corner.
There are Screw Covers over these screws. The Screw Covers need to be removed.
Little round covers I believe to be made of plastic.
(Some models they are made of synthetic rubber)
I use a computer pick to Gently remove them.
Some use the tip of an X-Acto knife. I do not recommend this as there is a possibility of injury.
Perhaps a large darning needle. (Needle you sew with, but is Large in size)
Pick up at one edge of Screw Cover. Screw Covers are held on by a type of rubber cement.
I LIGHTLY stick them to the Display Bezel for safekeeping.
(Yes. They like to stick to the tool, your fingers, and it seems passing jets in the sky.
If you are careful with them, you should be able to reuse them.
If they do not stick anymore, use a toothpick, and apply a TINY dab of rubber cement to them/it )
Once the Screw Covers are removed use a No.1 Philips screwdriver, or equivalent Jewelers screwdriver; to remove the 2 screws.
The Display Bezel has TABS going around the exterior perimeter, of it's inside edges.
These Tabs snap into matching LATCHES on the Display Cover.
You can come from the Outside edge, where the Display Bezel meets the Display Cover, and use a thick guitar pick.
The guitar pick is wedged into the parting line, of where the Display Bezel meets the Display Cover.
Once a 'crack' is formed in-between the two, then the fingertips are used to gently start popping the bezel from the cover.
You slowly go along with your fingertips, and work along the top, then sides. By the time you have both sides almost loose, the Display Bezel usually pops off.
I like the flex method.
Come to the inside edge of the Display Bezel.
Where it meets the LCD screen. I suggest start on the Right side/Middle.
Use a fingertip, and lift up the inside edge of the Display Bezel up a little. Can't lift up at that spot? Move over. You are at a Tab/Latch.
With this spot lifted up a little, use the fingertip of the other hand, and slide under next to it.
Now use your fingertips as wedges, and pop the Display Bezel loose a little at a time.
I start at the Right side/Middle as stated. Left hand fingertips go DOWN the right side, Right hand fingertips go UP the right side.
Then I go across the Top, and down the Left side.
MOST of the time, as stated; the Display Bezel usually pops off when right side, and left side are most of the way popped loose.
NOT always though!
Sometimes you have to pop EACH and EVERY Tab/Latch loose.
Also; watch around the Hinge area/s.
Display Bezel can get hung up around them.
Go slow, and gently work the Display Bezel off, around the Hinge areas.
Display Bezel popped off, sit back; relax. You just did the hard part.
Wasn't so tough, huh?
This is what the Display Bezel looks like removed,http://www.ebay.com/itm/Gateway-NV57H15U-LCD-Front-Bezel-15-6-AP0HJ00021-/171020787909?pt=LH_DefaultDomain_0&hash=item27d1a220c5
The MAIN view shown is a BACK view.
In the smaller views underneath, the 4th view from the Left, shows the FRONT view.
If you SET your mouse cursor in the middle of the Main view photo, the Zoom In feature is enabled.
You can CLICK on any of the smaller views, to make them appear as a Main view.
You can also see that the Hinge Covers, are an integral part of the Display Bezel. Shows you that when removing the Display Bezel, these Hinge Covers may need to be worked off of the Hinges.
Of course, may not; as I have previously stated.
The LCD screen is an Assembly. It is composed of layers.
These layers are kept in the factory set alignment, by a metal Screen Frame.
The Screen Frame resembles a picture frame.
There are THREE screws on each side of the Screen Frame.
These screws (Philips) go through metal Brackets, and hold the LCD screen/Screen Frame; to the Display Cover.
The Brackets are an integral part of the Hinges,http://www.ebay.com/itm/Gateway-NV55-NV57-LCD-Left-Hinge-Rail-Bracket-AM0HJ000100-/400334888754?pt=LH_DefaultDomain_0&hash=item5d35d19f32
On EACH side, there is 1 screw towards the Top, 1 screw towards the Bottom/Middle, and 1 screw towards the Bottom.
Remove all 6 screws.
At the Top is the Webcam Cable. Unplug it from the Webcam Module.
(Cable pulls to LEFT side, facing laptop)
The TOP of the LCD screen is now tilted forward.
The Video Cable plugs into the Bottom side.
There should be a piece of clear Mylar tape, holding the Video Cable connector in place. Carefully peel it back, unplug the Video Cable from the LCD screen.
Remove the LCD screen.
Reverse steps to install new LCD screen.
For additional questions please post in a Comment.