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This guide outlines the steps to tear down your Canon PowerShot S400 camera to its basic components.
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            On the backside of the camera, remove the 4.75 mm screw that sits at the top right corner. 
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            Remove the four 4.75 mm screws that sit at the bottom of the camera. 
 
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            On the side of the camera, remove the two 4.75 mm screws that sit near the USB digital terminal. 
 
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            On the side of the camera, remove the four 4.75 mm screws that sit near the wrist strap mount. 
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            Remove the two small metal plates, which the four screws hold in place. 
 
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   crwdns2935267:0crwdne2935267:0Tweezers$4.99- 
                     
            Remove the small black plastic piece and set it aside. If necessary, use tweezers to remove the small black plastic piece. 
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            Detach the front case and back case. 
 
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            Remove the 3.5 mm screw that sits on the metal plate at the bottom of the camera. 
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            Remove the two other 3.5 mm screws that sit on the side, to the left of the screw you just removed. 
 
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            A ribbon cable attaches to the metal plate and to the main circuit board, on the front of the camera. 
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            Gently release the black latch. 
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            Remove the ribbon cable and metal plate assembly. 
 
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            On the backside of the camera, remove the 3.5 mm screw that sits to the left of the viewfinder and above the LCD screen. 
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            Remove the second 3.5 mm screw that sits directly above the LCD screen. 
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            Gently detach the ribbon cable. 
 
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            Locate the ribbon cable on the main circuit board, which sits below the lens. 
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            Gently release the black latch on the ribbon cable connector and detach the ribbon cable. 
 
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            Remove the LCD screen and set it aside. 
 
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            On the main circuit board, gently release the black latches of the four ribbon cables. 
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            Gently detach the ribbon cables. 
 
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            Detach the white-capped and green-capped wires, which sit near the flash. 
 
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            Using a spudger, gently detach the shutter button assembly from the camera. 
 
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            Remove the four 3.5 mm screws that hold the main circuit board. 
 
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            In a hinge-like motion, gently lift the bottom of the main circuit board, which is the side without the soldering points. 
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            Gently detach the white ribbon cable from the underside of the main circuit board. 
 
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            Gently desolder the two ribbon cables attached to the motherboard. 
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            Remove the motherboard. 
 
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            Working with the lens-flash assembly, remove the three 3.45mm screws located on the metal plate. 
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            Separate the flash assembly from the lens assembly. 
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            Set aside the flash assembly in a safe location. 
 
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            Remove the three 2.5 mm screws connecting the viewfinder to the rest of the lens assembly. 
 
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            Remove the three 2.5 mm screws underneath the flex circuit. 
 
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            Remove the small 1.5 mm screw attaching the metal plate to the lens assembly. 
 
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            To reassemble the camera, follow all of the steps in reverse order. Take care to reconnect all ribbon cables and secure screws properly. 
 
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crwdns2947412:03crwdne2947412:0
FYI My S400 would not start sometimes. If I banged it in the palm of my hand occasionally it would then work. I was also having terrible trouble with batteries not working and showing low charge when they had been charged.. I opened it up as a last resort. On the front left side below the shutter button there was a small ribbon cable that under a magnifying glass I could see was slightly out of line. I reseated it and the camera has acted flawlessly since.
Am curious - I do not see the “Sensor” in this teardown? My immaculate S400 never dropped, not a scratch or scuff-mark, suddenly stopped working - dead sensor. The shutter still works and it can play images taken on another camera. But the display is near-black in record mode and images taken are “pure black”. It literally went from perfect to dead in one power-cycle. I was wondering if something may have come loose in there that a tear-down would identify?
Is there any CCD replacement video of ixus400 or reference material?
