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This guide provides instructions on how to replace the shutter button assembly on the Canon PowerShot S400.
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            Remove the 4.75mm screw located in the top right corner of the backside of the camera. 
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            Remove the four # screws located on the bottom of the camera. 
 
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            Remove the two screws located on the right side of the camera.(the side with the USB adaption plug) 
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            Remove the four screws on the left side of the camera. 
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            This will release a small metal plate. Remove this plate. 
 
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            Now separate the front and back camera casings. 
 
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            Using a spudger, carefully pry the shutter button assembly from the camera. 
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            Install the replacement shutter button assembly. 
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.
