Step 33: If you replace the logic board you will necessarily need to desolder and resolder the battery and Lighting Connector cable. A new logic board will not come with these two items attached. See Old Turkey's reply to my question on this subject...

Soldering Techniques for Battery and Lightning Connector

Thank you Phillip for providing this Guide. I used it to replace a bad LCD assembly after a water spill damaged it. The last Step 20 is very difficult. I had the worst time trying to separate the two parts after I removed the final Torex screw. It took a while, trying different angles, but I finally got it. Putting in the new one was a trivial exercise...

Great Guide thank you Phillip for providing it here. I could not have brought my MacBook Pro back to life without it! I used it to swap logic boards from a case damaged, but working MC724 into a water damaged MD313 with a pristine case.

You can see it on the upper left of the Logic Board, just to the right of the camera in the photo for Step 18. It is easier to see if you click on the view huge link to blow up the photo.

It goes on the edge of the logic board where the Digitizer and LCD Panel ribbon cables bend over the Logic Board before they plug into it. The rubber piece protects the ribbon cables from chafing like a bumper and from interferance.

Great guide! I recommend adding some of the notes in this guide to the guide itself. One regarding the connector that goes under the EMI shield at the top of phone connecting the long screw at the top in the center to the gold dot on the logic board (I found this one in the notes OK). It is the connector for the WIFI and Bluetooth antenna as it turns out (the guide is incorrect as the antenna connector by the speakers is for the 3G/IPhone radio not the WIFI). The other, the rubber guard that fits over the edge of the logic board where the Digitizer and LCD ribbon cables bend over the logic board (I missed this step in the notes, but am not going to disassemble to fix, hope it's not too important, lol). A couple of more panels with photos illustrating the two steps would do it.

I could not have attempted this without this guide let alone be successful, great job! Thank you!