HP ProBook 6455b, 6555b, 6450b and 6550b Notebook PCs Maintenance and Service Guide

Description Spare part number
Intel P4600 2.0-GHz processor, 2-MB L2 cache, 35W 628941-001
Intel P4500 1.8-GHz processor, 2-MB L2 cache, 35W 611699-001
Before removing the processor, 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 74).
5. Remove the following components:
a. Keyboard (see
Keyboard on page 90)
b. Switch cover (see
Switch cover on page 97)
c. Fan (see
Fan on page 102)
d. Heat sink (see
Heat sink on page 104)
Remove the processor:
1. Use a flat-bladed screwdriver to turn the processor locking screw (1) one-half turn
counterclockwise, until you hear a click.
2. Lift the processor (2) straight up and remove it.
NOTE: When you install the processor, the gold triangle (3) on the processor must be aligned
with the triangle (4) embossed on the processor socket.
Component replacement procedures 107