Follow these easy steps and you will be on your way to a good as new Gameboy.
Step 1: Tools of Your Trade
2.) Soldering iron.
4.) Electrical tape
5.) Paper - unlikely to be needed, but to be safe you'll want some paper on hand to prevent an accidental short circuit of your Gameboy.
As with all Instructables work slow, be careful and be safe. In this one you'll be working with sharp blades and a very hot soldiering iron. Don't touch the tip of the iron. Most soldering iron kits come with a little metal rest stand. Use this when not using the soldering iron as it can cause damage to you and to your stuff.
Step 2: Identify the Issue
Step 3: More Obvious Stuff
Use the triwing screwdriver to unscrew the back of the Gameboy. Be careful not to whip it open once you've got the screws out. There are short wires that connect the front and back portions of the unit. Slowly, open it and set the side with the screen on top of the back. It won't be perfectly flat, but that's ok.
The next super easy part is to use the phillips screwdriver to take the screws out of the circuit board that is in the front portion of the Gameboy. This is the side with the screen in it.
You may need to use the flat head screwdriver to unpinch three prongs holding the circuit board down.
Once you've got the circuit board out slide the piece of paper in between the two sides of the Gameboy. This will act as insulation to prevent any electrical shocks.
Now, look for a thick black sticker running the length of the bottom of the screen. You're going to peel this off slowly. Very slowly. Underneath this are the little soldered joints connecting all that processing power to the screen. Some of these soldered joints have come loose. You need to be gentle so you don't break any more of them.
You may need to use the flat head screwdriver to scrape, gently, to get the black sticker off.
Save the sticker.
Step 4: The Hard Part (and It's Not That Hard)
You can see the tip I used for my soldering iron. I don't know what it's called, but it worked great.
Once the soldering iron is up and running, gently drag it along the band just below the screen where you had lines showing.
Don't hold it on one spot.
Move it along and pick it up quickly. Otherwise you can melt the stuff in there or damage the screen. I held it too long in one place and my screen turned purple and blue and all sorts of colors in a small section on the bottom left of the screen. It eventually went away, but you can do some damage here.
You may cause other places on the screen to show lines. This is ok. Just keep running the soldiering iron along the band and they will go away.
You may not be able to get the screen perfect, but you probably can. While I was working on mine I kept getting one stubborn section on the left. Hence, I ended up holding the soldering iron there too long. However, when I put everything back together the line was gone.
Step 5: Put It Back Together
The image is a side shot to show the tape job. It doesn't have to be pretty, but all those layers of tape will A.) hold the sticker in place and B.) increase the thickness so the outer case of the Gameboy holds the sticker in place.
Put all the screws back in.
Step 6: Completed
This is the first time I did this after watching a few videos and reading about it.
Total time spent actually working on the Gameboy = 30 minutes. You could do it in 15 after doing it once.