Introduction
This repair guide will aid you in accessing the optical viewer of your Sony SLT-A57 camera in order to replace the viewfinder. You will need a new Sony SLT-A57 viewfinder to substitute the old one. You will also need a phillips #0 screwdriver and an 8” needle nose plier. This repair does not require any special skills.
Tools
Parts
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            Unscrew every screw on the side and back camera to pry open the back plastic portion of the camera. The screws will be 2.1mm and 1.5mm. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.