Pop the six clips indicated in green and remove back. I removed the two on the sides first, but it was a huge pain to open the rest of the way. I suggest starting from the top four.

Blue is the connector to the screen and speaker board in the top of the phone.

Purple is the chip and orange is charging port.

The opposite side of the board (not pictured) has the microphone on it, it's a small black round bump on the bottom.