Introduction
The speakers and 3D adjustment knob can all be found on the same ribbon cable. Replacing any of them requires first removing the entire speaker assembly.
What you need
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Grab the top edge of the back cover with your opposite hand so that the cover does not fall back into place.
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Pull the back cover up and away from the rest of the device to remove it.
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Insert a plastic opening tool into the notch in the lower case above the battery.
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Pry the battery up with the plastic opening tool.
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Grab the top edge of the battery and lift it out of the lower case.
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Remove the nine 6.3 mm black Phillips screws from the lower case.
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Remove the 2.4 mm silver Phillips screw above the game cartridge slot.
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Lift the bottom edge of the lower case off the rest of the 3DS.
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Use a plastic opening tool to pry the shoulder button ribbon cables off their sockets on the motherboard.
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Remove the lower case from the device.
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Remove the two 7.7 mm Phillips screws securing the back of the Circle Pad to the motherboard.
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Use the flat end of a spudger to pry the back of the Circle Pad off the motherboard.
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Lift the Circle Pad joystick off the motherboard and lay it on its back so that the ribbon cable connector is accessible.
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Use the flat end of a spudger or your fingernail to flip up the retaining flap on the Circle Pad ribbon cable ZIF socket.
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Lift the Circle Pad joystick off the motherboard.
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Use the flat end of a spudger to pry the SD board ribbon cable connector off its socket on the motherboard.
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Insert the flat end of a spudger between the SD board and the motherboard.
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Pry up slowly to loosen the SD board from the RF shield underneath it. If you pry too quickly, you may tear the shield or break its solder points.
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Run the spudger along the sides of the SD board to free it from the adhesive holding it in place.
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Once completely freed, lift the SD board straight off the motherboard.
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Slide the flat end of a spudger under the corner of the Wi-Fi board, and lift it away from the motherboard.
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Use the flat end of a spudger to pry the Wi-Fi antenna cable connector off its socket on the Wi-Fi board.
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Remove the Wi-Fi board from the device.
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Use the flat end of a spudger or your fingernail to flip up the retaining flap on the speaker assembly ribbon cable ZIF socket.
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Disconnect the speaker assembly ribbon cable with a pair of tweezers.
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Use the flat end of a spudger or your fingernail to flip up the retaining flap on the camera ribbon cable ZIF socket.
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Remove seven Phillips screws securing the motherboard to the upper case:
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Four 2.5 mm gold screws
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Two 3.5 mm black screws
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One 2.5 mm silver screw
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Lift the side of the motherboard that sits along the bottom edge of the 3DS.
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Use the flat end of a spudger or your fingernail to flip up the retaining flap on the LCD ribbon cable ZIF socket.
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Heat the edges of the upper display front panel with a hair dryer or heat gun to soften the adhesive holding it to the display bezel.
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Begin prying the edges of the front panel off with a plastic opening tool.
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Continue prying the remaining sides of the front panel by sliding the plastic opening tool down each edge.
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Remove the six 3.6 mm Phillips screws securing the rear display bezel to the front display bezel.
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Lift the edge of the rear display bezel closest to you and rotate it towards the hinge.
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Continue to lift the rear display bezel off the rest of the device until it is free.
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Insert a metal probe into the space above the ABXY buttons with the point touching the metal hinge.
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Push the hinge towards the center of the upper case. This will require a fair amount of force.
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Slowly pull the upper display assembly away from the upper case.
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Make sure that the various ribbon cables are being fed through the slit in the upper case.
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Separate the upper display assembly from the upper case.
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Carefully feed the speaker assembly ribbon cable through the hole in the upper display bezel.
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Remove the 2.5 mm Phillips screw securing the right speaker board to the upper display bezel.
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Use the flat end of a spudger or your fingernail to flip up the retaining flaps on the parallax barrier ribbon cable ZIF sockets.
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Use a pair of metal tweezers to disconnect the two ribbon cables.
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Use the flat end of a spudger to pry the left and right speakers out of their places in the upper display bezel.
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Pry the camera status LED out of the upper display bezel with the tip of a spudger.
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