Canon PowerShot S400 Battery Replacement

On the backside of the camera, remove the 4.75 mm screw that sits at the top right corner.

Remove the four 4.75 mm screws that sit at the bottom of the camera.

On the side of the camera, remove the two 4.75 mm screws that sit near the USB digital terminal.

On the side of the camera, remove the four 4.75 mm screws that sit near the wrist strap mount.

Remove the two small metal plates, which the four screws hold in place.

Remove the small black plastic piece and set it aside. If necessary, use tweezers to remove the small black plastic piece.

Detach the front case and back case.

Remove the 3.5 mm screw that sits on the metal plate at the bottom of the camera.

Remove the two other 3.5 mm screws that sit on the side, to the left of the screw you just removed.

A ribbon cable attaches to the metal plate and to the main circuit board, on the front of the camera.

Gently release the black latch.

Remove the ribbon cable and metal plate assembly.

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.

Remove the second 3.5 mm screw that sits directly above the LCD screen.

Gently detach the ribbon cable.

Locate the ribbon cable on the main circuit board, which sits below the lens.

Gently release the black latch on the ribbon cable connector and detach the ribbon cable.

Remove the LCD screen and set it aside.

Locate the ribbon cable connection to the left of the lens on the main circuit board.

Gently flip open the black latch on the connector and detach the ribbon cable.

Locate the three ribbon cables on the main circuit board. Gently flip open these black latches.

Gently disconnect the ribbon cables.

Locate the white and green connectors underneath the flash.

Gently disconnect these connectors.

Using a spudger, carefully pry the shutter button assembly from the camera.

Remove the four screws securing the main circuit board to the rest of the camera. (In the image, some of the screws have already been removed)

Gently lift the bottom of the main circuit board, the side without the soldered attachment points, like a hinge.

Locate the white ribbon cable attached to the underside of the main circuit board.

Gently remove the white ribbon cable from the connector.

Locate and remove the three 3.45mm screws on the backside of the camera that secure the CF card slot.

Make note of the orientation of the ribbon cable connected to the CF card slot. You will need this for re-assembly.

Gently remove the CF card slot.

Orient the camera so you are looking at the top.

Locate the white connector that attaches the flex circuit to the capacitor.

Disconnect the connector.

Adhesive tape attaches the flex circuit to the top of the camera. Gently un-stick the flex circuit from the tape, but do not completely remove the flex circuit.

Remove the two 3.45mm screws located on the backside of the camera.

Separate the battery compartment and the lens-flash assembly.

Set the lens-flash assembly aside.

De-solder the two soldered ribbon cables attached to the motherboard.

Separate the motherboard and battery case.

Replace battery casing