HP ProBook 6540b HP ProBook 6545b, 6540b, 6445b and 6440b Notebook PC - Mainte - Page 101

Removal and replacement procedures Power button board Description For use only with HP Compaq 6545b computer models For use only with HP Compaq 6445b computer models For use only with HP Compaq 6540b and 6440b computer models Spare part number 583268-001 583267-001 593838-001 Before removing the power button board, follow these steps: 1. Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on, and then shut it down through the operating system. 2. Disconnect all external devices connected to the computer. 3. Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and then unplugging the AC adapter from the computer. 4. Remove the battery (see "Battery" on page 4-7). 5. Remove the switch cover (see "Switch cover" on page 4-30). Remove the power button board: 1. Turn the switch cover upside down, with the rear toward you. 2. Release the ZIF connector to which the power button board cable is attached, and then disconnect the power button board cable 1 from the capacitive board. 3. Remove the two Phillips PM2.0×3.0 screws 2 that secure the power button board to the switch cover. 4. Remove the power button board 3 and cable. Reverse this procedure to install the power button board. 4-32 Maintenance and Service Guide