Introduction
This guide will help to you access your viewfinder in your Nikon D40 and replace the viewfinder.
Tools
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Remove the two visible 6.0 mm Philips #0 screws on the left and right sides of the viewfinder. These screws are highlighted in red.
 
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You will be able to see the ribbon cables coming out from the back panel, disconnect the cables.
 
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Use a spudger to keep the upper body separate from the printed circuit board.
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Wiggle the plastic eyepiece out of the frame. This may require some force.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.