Thank you! Thank you!! I rescued my 6D. All your steps and details were very useful.
Few points to add:
1. I think the black screw (yellow circle) from step 7 is 3 mm.
2. Lift the light brown flap that holds the ribbon cable before removing the LCD panel.
3. When you remove the LCD panel from the metal housing, you will have to pry the two strips of adhesive that is there.
4. Be careful when tightening the screws back.