Monday, 24 November 2014

Remove A Cmos Battery From A Compaq Evo N800

CMOS battery installed on a motherboard (left side of the image)

The Compaq Evo N800 is a laptop computer that comes equipped with a Pentium 4 processor, 256 MB of DDR SDRAM, 60 GB of hard drive space and a 15-inch XGA display. When your N800 is not in use, certain system settings, such as the date and time, are preserved in memory that is powered by a CMOS battery. If the CMOS battery loses its charge and you wish to install a replacement, you will first need to partially disassemble the computer.



1. Shut down your Evo N800 and disconnect the power cord and any attached peripheral devices. Turn the laptop over and locate the installed battery pack. Slide the battery release latch to the unlocked position and remove the installed battery pack. Examine the opposite side of the laptop and locate the installed MultiBay device. Slide the MultiBay release latch to the unlocked position and remove the installed device.

2. Find the hard drive module, located next to the now-empty battery bay. Locate and remove the screw securing the hard drive module to the laptop's base. Slide the hard drive module out of the laptop and set it aside.

3. Examine the underside of the laptop and locate the two screws near the rear edge that secure the LED cover to the laptop's base; remove the screws and open the laptop. Examine the LED cover, located just above the keyboard, and find the four clips that secure the cover in place. Use your pry tool to disengage the LED cover from the clips. Hold down the "esc" and "F1" keys to reveal a notch in the LED cover; insert your pry tool into the notch and lift the left side of the LED cover. Repeat this process on the right side by holding down the "Pause" and "Del" keys. Remove the LED cover and set it aside.

4. Lift the back edge of the keyboard and slide it free from the palm rest. Flip the keyboard over and find the keyboard shield located underneath. Remove the two screws that secure the keyboard shield in place; remove the keyboard shield and set it aside. Find the ZIF connector located underneath the keyboard shield and disconnect the keyboard cable from the system board. Remove the keyboard and set it aside.

5. Close the display and examine the rear panel of the laptop. Locate and remove the two screws set into the rear panel, beneath the display hinges. Reopen the display, then locate and disconnect the two cables that lead from the display to the system board. Examine the display hinges and remove the screws that secure each hinge to the laptop's base. Lift the display off of the laptop and set it aside.

6. Examine the underside of the laptop's base and remove the eight screws located around the periphery of the base. Remove the single screw located next to the bottom-left corner of memory module compartment. Examine the hard drive bay and remove the screw located above the one set in the middle of the bay. Return the laptop to its upright position and disconnect all the visible cables from the system board.

7. Locate and remove the four screws that secure the top cover to the laptop's base. Examine the rear panel of the laptop and remove the remaining screws. Remove the top cover and locate the CMOS battery underneath. Use your pry tool to remove the CMOS battery from its socket.

Tags: hard drive, laptop base, that secure, keyboard shield, CMOS battery, drive module