How to Replace Dell Latitude D505 CPU From Celeron to Pentium

The Dell Latitude D505 laptop was produced with three different series of available processors, including the Celeron M and two versions of the Pentium M. All three processors use the same socket and are supported by the same chip set on the motherboard, resulting in an upgrade path for laptops that shipped with the Celeron-M. Processing speeds also vary within each range of processors, allowing an upgrade within the same processor series in some cases.

Perform a full system backup or back up any important files onto an external device or blank optical discs before beginning the upgrade procedure.

Power off the Dell Latitude D505 laptop computer system by clicking "Start" and "Shut Down" from the "Start" menu. If unsure whether the system is in sleep, standby or hibernation mode, power it on and let the operating system load. Then shut it down using the "Start" menu.

Disconnect all of the peripherals and cables from the computer, including the power cord and any memory cards or other devices, and remove the system from the docking station, if it has one.

Close the lid and flip the laptop upside down. Press the battery release button and remove the main battery.

Attach the alligator clip end of the antistatic wrist strap to a grounded terminal on the work bench or to the ground terminal on an electrical socket. Wrap the other end around either wrist.

Flip the computer right-side up and open the lid as far as it will go, so that the lid is flush against the bench and level with the keyboard.

Insert the edge of the plastic butter knife or credit card in between one end of the thin plastic trim strip at the top of the keyboard and the edge of the computer case above the "Backspace" key. Pry the edge of the trim strip up gently to disengage the retention tab, and slowly lift the strip up and off the laptop to avoid damaging the strip or the tabs.

Remove the small screws from the top of the keyboard and gently lift the top edge of the keyboard up about an inch. Pull the keyboard toward the screen about 1/2 inch until the bottom edge is free, and then set the keyboard down by the palm rest to expose the motherboard and processor. It is not usually necessary to disconnect the cable that attaches the keyboard to the motherboard.

Disconnect the two small gold-tipped antenna cables from the wireless adaptor terminals and disconnect the display cable from the motherboard.

Loosen the four mounting screws that hold the CPU cooling unit in place above the processor and remove the cooling unit.

Loosen the processor retention tab on the motherboard. Gently grasp the Celeron processor by the edges and pull it straight up out of the system, being careful not to bend any of the pins.

Place the Pentium-M processor into the socket as indicated by the small triangle on one corner of the socket, which lines up with a similar triangle on the processor. Line up the pins and allow the processor to lower itself into the socket. Tighten the processor retention screw once the processor is fully seated.

Apply a small dab of thermal cooling compound to the top of the processor and place the CPU cooling unit squarely onto the processor. Tighten the four mounting screws.

Connect the display cable and the wireless antenna cables. The connectors are made in a way that ensures proper orientation, and they cannot be connected wrongly without using excessive force.

Slide the keyboard up and insert the bottom edge of the keyboard into the palm rest. Lower the keyboard in place and replace the screws and the trim.

Close the lid and flip the D505 upside down to install the main battery. Reconnect the cables and peripherals. Power on the computer.


Bring the laptop to a qualified repair centre to have the processor upgrade performed by trained professionals if you are unsure of how to perform these steps. Place every screw and component in a pattern on the bench that lets you easily replace each part in exactly the same place it came from. There are several different-length screws, which all look about the same. It is important to replace each one into the same hole it came out of.


Many internal components of the Dell Latitude are static-sensitive and can be destroyed by a small electrostatic discharge. Prevent discharge by wearing an antistatic wrist strap or other protective gear. Never force the processor into the socket as this can destroy it beyond repair by bending the pins.

Things You'll Need

  • Antistatic wrist strap
  • Plastic butter knife or credit card
  • Small screwdriver set
  • Thermal heat sink compound
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About the Author

Norm Dickinson began his writing career in 1997 as a content creator for Web pages he designed for clients. His work appears on various websites, focusing on computer technology. Dickinson holds an Associate of Arts in industrial electronics technology and another Associate of Arts in computer science.