MacBook Pro 13", A1278, Early 2011 - Late 2011, MC700LL/A, Board#820-2936-A, 820-2936-B
The 2011 models of the 13" MacBook Pro were especially prone to GPU issues, so watch out for video artifacts!
Power-on pads are two tiny metal surfaces on MacBook logic boards.
To find the pads for a particular board, enter the year, screen size, and computer type below, and the relevant logic board with power-on pad locations will appear. Click on the images for details and additional pictures.
Please let me know if you find errors, and if you have images of boards not listed, and I will be happy to include them!