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Replacing the CMOS Battery for HP Pavilion 23-p000 All-in-One PCs

This document applies to HP Pavilion 23-p000 All-in-One PCs.
HP Pavilion 23-p000 All-in-One PCs
Before you begin
CMOS factory settings should be restored as a first step before replacing the system motherboard. To restore the CMOS factory settings, replace the CMOS battery.
  • You need a Phillips head screwdriver.
  • You need a flat head screwdriver.
  • Turn off the computer. Disconnect the Ethernet or modem cable. Disconnect the power cord.
  • Transfer the computer to a clean, flat, stable work surface over a noncarpeted floor. HP recommends that you put down a blanket, towel, or other soft cloth to protect the screen from scratches or other damage.
  • Electrostatic discharge (ESD) can damage your processor, disk drives, expansion boards and other components. HP strongly recommends the use of an antistatic wrist strap and a conductive foam pad when working on the computer.
  • Do not remove a component from its protective packaging until you are ready to install it.
  caution:
This product contains components that can be damaged by electrostatic discharge (ESD). To reduce the chance of ESD damage, work over a noncarpeted floor, use a static dissipative work surface (such as a conductive foam pad), and wear an ESD wrist strap connected to a grounded surface.
Video overview
View the following video before using the steps in this article.
  note:
For best quality on dial-up connections, wait until the video has fully loaded before viewing.
Removing the CMOS battery
If the computer clock is losing time, change the CMOS battery. After replacing the battery with these instructions, it is necessary to reset the clock in the BIOS.
Use the following steps to remove the CMOS battery:
Step 1
Remove the rear cover.
For instructions to remove the rear cover, see the HP support document, Removing and Replacing the Rear Cover.
Removing the rear cover
Step 2
Remove the two Philips #2 screws securing the motherboard shield to the PC.
Removing the screws securing the motherboard shield
The screw locations are indicated by a stencil of an arrow with no circles inside.
Locating the stencil for motherboard shield screw locations
Step 3
Tilt up the inside edge of the shield and pull it off the unit.
Removing the motherboard shield
Step 4
To remove the CMOS battery, pry it up out of its socket and lift the battery off the motherboard.
Wait at least thirty seconds before replacing the battery.
Removing the CMOS battery
Replacing the CMOS battery
Wait for thirty seconds before replacing the CMOS battery using the following steps:
Step 1
To replace the battery, insert the battery in the same orientation, with the writing facing the same way as it was on the battery that was removed.
CMOS factory settings are now reset.
Note that you will now need to enter system BIOS and reset the clock in BIOS after this procedure.
Replacing the CMOS battery
Step 2
Find the three tabs at the outer edge of the motherboard shield outer edge ...
Locating the tabs on the motherboard shield
... and find the three slots on the middle frame.
Locating the slots on the middle frame of the computer
Step 3
To replace the motherboard shield, align the tabs on the side of the shield into their slots, then swing and press the shield into place.
Replacing the motherboard shield
Step 4
Replace the two Philips #2 screws to secure the motherboard EMI shield to the middle frame.
Replacing the screws securing the motherboard shield
Step 5
Replace the rear cover.
For instructions to replace the rear cover, see the HP support document, Removing and Replacing the Rear Cover.
Replacing the rear cover

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