iFixit

Remove the single Phillips screw securing the logic board to the inner case.

Use a PSP opening tool to gently flip up the right trigger connector.

Unscrew the lone Phillips screw holding the trigger in place. Remove both trigger and retaining plate from the PSP Go.

Use a #00 Phillips screwdriver to unscrew both bottom plate screws.

Remove the bottom plate by lifting it away from the device.

Remove both headphone jack and analog joystick screws using your #00 Phillips screwdriver.

Be very careful when disconnecting the following cables. The connectors do not have flip-up tabs; just hold each cable steady and pull it out of the connector.

Unplug the volume button cable using a pair of tweezers. Be careful not to damage the cable.

Unplug the Start/Select button cable the same way. Make sure to grasp the black plastic pull tab of the cable.

Use a pair of tweezers to pull out the battery's clear plastic cover.

Notice the little metal tab and slot (marked in red) where the clear plastic cover slides into. Make sure you slide the cover into place properly when reassembling the PSP Go.

The logic board is still connected to the display, so do not fully remove it from its housing!

Gently lift the logic board slightly out of its housing.

Use a PSP opening tool to disconnect the display cable from the logic board.

The D-pad may come loose while prying the logic board.

The logic board should now be free from the rest of the device.

During reassembly, make sure to properly line up the power button with the power button lever on the logic board.