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

l. Speaker assembly (see Speaker assembly on page 129)
m. Card reader/USB board (see
Flash media/1394 board on page 132)
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:
●
SIM (see
SIM on page 75)
●
Expansion and primary memory modules (see
Primary memory module on page 94 and
Expansion memory module on page 81)
●
WLAN module (see
WLAN module on page 83)
●
WWAN module (see
WWAN module on page 86)
●
RTC battery (see
RTC battery on page 96)
●
Processor (see
Processor on page 106)
●
Modem module (see
Modem module on page 127)
●
Bluetooth module cable (see
Bluetooth module cable on page 131)
Remove the system board:
1. Disconnect the following cables:
●
Bluetooth module cable (1) from the system board
●
Modem module cable (2) from the modem module
●
External monitor cable (3) from the system board
136 Chapter 4 Removal and replacement procedures