Remove the 6 quarter inch nuts. When removing the panel pull out the bottom of the panel first.
Remove cables that are attached to panel.
Unplug the cables that go to the bad pixel strip.
Remove plastic nuts that hold the circuit board to the panel.
Move the circuit board to one side and remove the screws that are holding the bad pixels strip to the panel. On some models you will have to remove more of the cable that go to pixels strips so that you can move to circuit board to one side.
Move circuit board to other side and remove other screws to bad pixel strip.
From the front side remove bad pixel strip and replace it with the new one.
Pull wires all the way through. Make sure wire are not between panel and pixel strip.
Please Note: When placing the panel back onto sign, make sure you do not have any wires between panel and the sign.