Nintendo Game Boy Advance SP Brightness Switch Replacement

Introduction

The brightness switch is the circular button with a sun symbol engraved into it. The brightness switch is located at the top of the button panel.

Use a JIS 00 screwdriver to loosen the captive screw securing the battery cover.
You can try to use a non-iFixit Phillips driver in a pinch, but you risk damaging or stripping the screw. Push down firmly on the driver and twist slowly.

Lift the edge of the cover near the screw and remove the cover.
During reassembly, hook the tabs on the bottom edge of the cover into their slots and lay the cover into place.

Use your finger to lift the battery by the tab on its left edge, then remove it.
During reassembly:
Never reuse a deformed or damaged battery—it's a fire hazard. Replace it with a new battery.
Your replacement battery may come with a plastic enclosure that slides over the battery.
Insert the edge of the battery with contacts at a slight downward angle—aligning the contacts with their prongs in the recess—and press the battery into place.

Use a tri‑point Y0 screwdriver to remove the six screws securing the bottom shell:
Four 6.3 mm‑long recessed screws
Two 4.6 mm‑long screws

Use the point of a spudger or a clean fingernail to lift the speaker until you can grip it with your fingers.
Remove the speaker.

Remove the circular mesh from the speaker recess and set it aside—the piece can easily fall out and get lost when working.

Be careful not to strain the screen cable during the next few steps—it has very little slack.
You need to prop up the main body of your Game Boy in order to disconnect the screen cable without straining it. Here are two ways to do so:
Option 1: Open the main body of your Game Boy to a 90‑degree angle and gently lay the motherboard down. Make sure the main body is resting on top of the motherboard to give the cable slack.
Option 2: Keep the main body closed and prop it up on the edge of the logic board, using a sturdy object to hold it up.

Use the point of a spudger to push the two tabs on either side of the screen cable connector into the unlocked position.
Only push the tabs until they stop. If you push them too far, you may slide the locking tab off the connector.

Remove the main body from the motherboard.
During reassembly, prop up the main body for enough slack reconnect the screen cable.

With your fingers, lift the track pad out off the brightness switch.
Keep the track pad clean. A dirty or dusty track pad will lead to the brightness switch not working when you press it.