Canon PowerShot SD850 IS Flash Unit Replacement

Remove the following 4 screws:

Two 2.8 mm Phillips #00 at the bottom of the camera.

Two 2.75 mm Phillips #00 on the opposite side of the wrist strap.

Open the A/V OUT DIGITAL flap on the side of the wrist strap.

Remove the 2.75 mm Phillips #00 under the A/V OUT DIGITAL flap on the side of the wrist strap.

On the bottom of the camera, use your fingernail to slide the light gray tab towards the edge of the camera.

Slide light gray door and pull up to open the door.

Remove the 8.35 mm Phillips #00 next to the brown tab that holds the battery.

Gently pull the front cover straight out from the camera. This will expose the wiring on the front of the camera.

Remove the 2.75 mm Phillips #00 next to A/V OUT DIGITAL.

Slide the back casing (with the screen protector) off to reveal the LCD and back wiring.

Remove the 1.75 mm Phillips #00 located at the top left of the LCD screen.

Remove the two 3.4 mm Phillips #00 located at the bottom of the camera.

Remove the two metal frames that hold the LCD panel in place.

The LCD screen should now only be attached by two LCD data cables.

Lift the screen from the left side and use a spudger or a small flat head screwdriver to flip the black portion of the connector upward to unlock it.

Carefully slide the data cable out of the connector.

The LCD should still be connected by the backlight cable.

To remove the backlight cable, use a spudger or a small flat head screwdriver to unlock the backlight cable.

Carefully slide out the backlight cable.

The LCD screen can now be fully detached from the camera body.

The LCD screen and housing are now in three pieces:

LCD screen

LCD screen frame

LCD back housing

The LCD screen itself can now be removed and fixed/replaced.

Remove the 1.85 mm #00 Phillips located on the left side of the camera.

Use a set of tweezers to remove the speaker located at the top of the camera on the flash unit.

Next use the tweezers to carefully remove the speaker cable off its respective holders.

Use a spudger or a flathead screwdriver to remove the camera lens cable located in the front of the camera.

Use a spudger or a flathead screwdriver and carefully pry out the first flash cable from the bottom of the cable. The white 2 prong power cable pops UP (use spudger below red/black insertion and put upward pressure). For the yellow one, apply pressure horizontally.

Next use a spudger or a flathead screwdriver and carefully pry out the second flash cable.

Gently remove the flash component from the rest of the camera.

Use a spudger or a flathead screwdriver and carefully pry off the plastic piece on top of the flash unit.

The flash unit can now be removed and replaced.