The button bar is the silver strip along the bottom of your LCD screen which enables you when the faceplate is intact to press the home, volume, screen darkness, mute, select and start buttons. If for some reason one of them particular buttons is not working you will need to replace the button bar. Generally though if you want to do any repairs on your PSP such as replacing a broken LCD screen you will need to remove the button bar anyway.
As you look face down as per the picture above, at your PlayStation Portable, you will need your small Flathead screwdriver just to gently slide underneath the button bar and slowly lift up until it comes away from the LCD housing plate.
The button bar has flex cable attached which is connected at the above point on the PSP power switch board, all you need to do is gently lift the connector clip and pull out the button bars flex cable, again use the small Flathead screwdriver the lift the clip. These connector clips can break easily if you use excessive force, so do take your time. Once you have unclipped the button bar, put it in a safe place and then you can continue on to remove the LCD screen.
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