Remove the metal handle from the suction cup. It's easier and safer to grip the suction cup's base instead of the metal handle.
Be very careful when opening the iPhone so that the cables under the display are not severed.
There is a rubber gasket between the silver front bezel and black display assembly. A bit of force is required in this step to separate the iPhone's display assembly.
Use a small suction cup near the Home button to gently pull up the bottom portion of the iPhone's display assembly.
If the display assembly is too damaged to allow the suction cup to adhere, tape with a strong adhesive such as duct tape maybe used.
Use a spudger to flip up the white plastic tab holding the remaining ribbon cable in place. The white tab will rotate up 90 degrees, releasing the ribbon cable.
Slide the black ribbon cable out of its connector, and remove the display assembly from the iPhone.
Use a spudger to gently remove the camera retaining clip, (formerly secured by the removed screw) and gently pry the camera up and out of its housing in the rear panel. The camera cannot be removed entirely yet because it's connected to the bottom of the logic board.
Use a spudger to gently pry up the end of the logic board closest to the dock connector.
There is a small golden grounding tab on the logic board adjacent to the 'Do not remove' sticker. Be very careful this does not snag on the side of the case when prying up the logic board; it breaks easily! If you have signal problems after removing the logic board, check this ground tab.
If the board won't lift up, double check to make sure all 8 screws securing the logic board have been removed.
Hm, swapped the docking assembly, but now my phone will only show the apple logo for a few seconds, then goes black. Switched back to my original dock connector, but I have the same problem. Tried the power+home trick, but no dice. Don't think the battery is short cirquited, but not sure, tried to measure it, only got about 3.6 volt, but unsure where which og the pins to measure on.
I was able to boot the phone before swapping out the dock (wanted to swap it because I had no sound from the speaker plus no wifi antenna due to a ripped cord) but not after swapping back. I've gone over all connections and I am fairly sure everyting is hooked up as it should.