In this instructable, I am going to show you how I made my L+R keys light up wihout buying a single thing. I have always wanted light up buttons ever since I saw a picture on google.
This mod requires absolutely NO soldering, NO technical know-how, and NO LED's. It strictly uses the light given off by the backlight for the lcd screen. Since I had only thought of instructablizing this after the fact, most of the pics were done in paint.

Sorry for the bad photos, you can blame my camera

Step 1: Tools

To get this thing apart, we'll need some tools.
You will need:
- A small philips screwdriver (the one that looks like a +)
- A fine flathead screwdriver
- A pair of pliers or a cutting dremel
- A pair of scissors

Step 2: Disassemble It!

Now, you will need to put those tools to use. Take off the battery cover and remove the battery. Next, you need to remove the warranty label located at the bottom of the compartment. Next takethe philips and remove every screw you see, on both ends of the PSP (the silver ones too) Dont forget about the screw on the bottom of the unit. (Note I didn't take the pic)

Step 3: Remove the Screen

You will remove the screen now. To do this, you will first have to remove the button bar at the bottom. Do this by gently prying it off from the left side with the flathead. Next, you gently pry up the left side screen clips that hold it in place. Then remove the screen, unplugging the ribbon cables.

If you dont understand, follow the procedures in this instructable: https://www.instructables.com/id/Replacing-PSP-1000-Screen/

Step 4: Disassmble the Screen and Mod It

Now you are going to take the screen apart. do this by finding the white tabs and pulling the metal faceplate away from the tabs and lifting it up. Then remove the back of the screen by doing the same thing. Now you need to cut away the metal and reflective plastic on the back panel where I have marked red in the picture with the scissors. Make sure that no metal is sticking out on either side of the back plate or else it will damage the screen. Once you finish, reassemble the screen.

Step 5: The Screen Cradle

Now you need to remove the thing the screen was clipped into. Take out every single screw you see holding it down and slowly remove it from the rest of the PSP. Now, with either the pliers or dremel, remove the area i marked red in the picture. If this stays there the R button will not light up. If you are using the pliers, bend the metal until it fatigues and breaks off. If you are using the dremel, simply cut it off.

Step 6: Put It Back Together

Now you just screw everything back together, in the reverse order that you took it apart. After you finish putting it back together, turn it on, and stare in awe your glowing buttons that none of your friends have (or ever will)

If they dont light up right... Trial and error! It took me 3 tries to get it right
if the screen doesn't respond... recheck the cables, till doesn't work, you may have killed it.

and yes, the corners of your screen will be a smidge darker, but not even noticeable