Remove the battery board and LED assembly, and flip them over.

If either of the two flex ribbon cables have been disconnected or damaged, use a spudger to flip the black latch up (away from the board), remove the cable, reinsert it, and press the latch down.

If your console does not power on, use an ohmmeter/continuity checker to test the SMT fuse F1. It should read as 0 ohms (short circuit). If not, you will need to replace the fuse or replace the board.

If you are stopping here, follow these instructions in reverse order to reassemble your device.