Step 19
Disconnect the connector cable from the modem.
Step 20 — PMU
Turn the G4 over.
Peel the orange tape away from the three connectors on the PMU board. Leave this tape in place so you can reuse it when reassembling the G4.
Disconnect the two orange cables and one multicolored cable from the PMU.
Step 21
Lift up on the silver metal clip to free the PMU from the casing.
Remove the PMU rotating it clockwise and pulling up.