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HP ProBook 4320s Notebook PC HP ProBook 4321s Notebook PC HP ProBook 4420s Notebook PC HP ProBook 4421s Notebook PC Maintenance and Service Guide SUMMARY This guide is a troubleshooting reference used for maintaining and servicing the computer. It provides comprehensive information on identifying computer features, components, and spare parts; troubleshooting computer problems; and performing computer disassembly procedures.

HP ProBook 4320s Notebook PC HP ProBook 4321s · PDF fileHP ProBook 4320s Notebook PC HP ProBook 4321s Notebook PC HP ProBook 4420s Notebook PC HP ProBook 4421s Notebook PC Maintenance

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  • HP ProBook 4320s Notebook PCHP ProBook 4321s Notebook PCHP ProBook 4420s Notebook PCHP ProBook 4421s Notebook PCMaintenance and Service Guide

    SUMMARY

    This guide is a troubleshooting reference used for maintaining and servicing the computer. It providescomprehensive information on identifying computer features, components, and spare parts;troubleshooting computer problems; and performing computer disassembly procedures.

  • Copyright 2010, 2011 Hewlett-PackardDevelopment Company, L.P.

    Bluetooth is a trademark owned by itsproprietor and used by Hewlett-PackardCompany under license. Intel is atrademarks of Intel Corporation in theUnited States and other countries.Microsoft, Windows, and Windows Vista areU.S. registered trademarks of MicrosoftCorporation. SD Logo is a trademark of itsproprietor.

    The information contained herein is subjectto change without notice. The onlywarranties for HP products and services areset forth in the express warranty statementsaccompanying such products and services.Nothing herein should be construed asconstituting an additional warranty. HP shallnot be liable for technical or editorial errorsor omissions contained herein.

    Third Edition: October 2011

    First Edition: March 2010

    Document Part Number: 595288-003

  • Safety warning noticeWARNING! To reduce the possibility of heat-related injuries or of overheating the computer, do notplace the computer directly on your lap or obstruct the computer air vents. Use the computer only ona hard, flat surface. Do not allow another hard surface, such as an adjoining optional printer, or a softsurface, such as pillows or rugs or clothing, to block airflow. Also, do not allow the AC adapter tocontact the skin or a soft surface, such as pillows or rugs or clothing, during operation. The computerand the AC adapter comply with the user-accessible surface temperature limits defined by theInternational Standard for Safety of Information Technology Equipment (IEC 60950).

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  • iv Safety warning notice

  • Table of contents

    1 Product description ........................................................................................................................................ 1

    2 External component identification .............................................................................................................. 10Identifying hardware ........................................................................................................................... 10Top components ................................................................................................................................. 11

    TouchPad .......................................................................................................................... 11Lights ................................................................................................................................. 12Buttons, speakers, switches, and fingerprint reader (select models only) ......................... 13Keys ................................................................................................................................... 14

    Front components .............................................................................................................................. 15Right-side components ....................................................................................................................... 16Left-side components ......................................................................................................................... 17Bottom components ........................................................................................................................... 18Display ................................................................................................................................................ 19Wireless antennas (select models only) ............................................................................................. 20Additional hardware components ....................................................................................................... 21

    3 Illustrated parts catalog ............................................................................................................................... 22Serial number label location ............................................................................................................... 22Computer major components ............................................................................................................. 23Display assembly components ........................................................................................................... 33Plastics Kit .......................................................................................................................................... 35Cable kit ............................................................................................................................................. 36Mass storage devices ......................................................................................................................... 37Miscellaneous parts ............................................................................................................................ 38Sequential part number listing ............................................................................................................ 40

    4 Removal and replacement procedures ....................................................................................................... 50Preliminary replacement requirements ............................................................................................... 50

    Tools required .................................................................................................................... 50Service considerations ....................................................................................................... 50

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  • Plastic parts ....................................................................................................... 50Cables and connectors ..................................................................................... 51Drive handling ................................................................................................... 51

    Grounding guidelines ......................................................................................................... 52Electrostatic discharge damage ........................................................................ 52

    Packaging and transporting guidelines ............................................. 53Workstation guidelines ..................................................................... 53Equipment guidelines ....................................................................... 54

    Component replacement procedures ................................................................................................. 55Serial number label ............................................................................................................ 55Computer feet .................................................................................................................... 55Battery ............................................................................................................................... 56SIM .................................................................................................................................... 57Switch cover ...................................................................................................................... 58Keyboard ........................................................................................................................... 60Memory module ................................................................................................................. 62Optical drive ....................................................................................................................... 64Power connector board ...................................................................................................... 66Speakers ............................................................................................................................ 67WWAN module .................................................................................................................. 69Palm rest ............................................................................................................................ 71Hard drive .......................................................................................................................... 73RTC battery ....................................................................................................................... 75WLAN module .................................................................................................................... 76Bluetooth module ............................................................................................................... 80Heat sink and fan ............................................................................................................... 82Processor ........................................................................................................................... 86Power connector cable ...................................................................................................... 89Display assembly ............................................................................................................... 90Top cover ........................................................................................................................... 98Modem