HP ProBook 640 G1, 645 G1, 650 G1, and 655 G1 Notebook PCs - Maintenance and Service Guide

a. Service cover (see Service cover on page 57)
b. Hard drive (see Hard drive on page 58)
c. Optical drive (see Optical drive on page 69)
d. Fan/heat sink assembly (see Fan and heat sink assembly on page 79)
e. Keyboard (see Keyboard on page 72)
f. Display assembly (see Display assembly on page 104)
g. Base enclosure (see Base enclosure on page 82)
h. USB board (see USB board on page 85)
NOTE: When replacing the system board, be sure that the following components are removed from the
defective system board and installed on the replacement system board:
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WWAN module (see WWAN module (select models only) on page 65)
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Solid-state drive (see Solid-state drive on page 70)
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WLAN module (see WLAN module on page 67)
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Expansion memory (see Primary memory module on page 62)
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Primary memory (see Expansion memory module on page 64)
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Smart card reader (see Smart card reader on page 88)
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Processor (see Processor on page 98)
Remove the system board:
1. Disconnect the following cables from the system board:
(1) Card reader cable
(2) Power connector cable
Left (3) and right (4)speaker cables
(5) Display panel cable (if display panel is still attached)
System board 93