With the top case removed, the power button is disconnected. Instead of having to reconnect the top case to turn on the system, there are two pads on the logic board that can be shorted across (with a tool like a flat blade screwdriver) to act as the power button.
These pads are located near the left side of the LVDS cable connector on the logic board. It is marked PWR BTN. The pads are separated with a vertical white line.
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