HP Elite c645 G2 Chromebook Manual

Maintenance and Service Guide
SUMMARY
This guide provides information about spare parts, removal and replacement of parts, security, backing up, and more.

Legal information
© Copyright 2022 HP Development Company,
L.P.
AMD, Radeon, and Ryzen are trademarks of
Advanced Micro Devices, Inc. Bluetooth is a
trademark owned by its proprietor and used
by HP Inc. under license. The terms HDMI,
HDMI High-Denition Multimedia Interface, and
the HDMI Logo are trademarks or registered
trademarks of HDMI Licensing Administrator,
Inc. Intel and XMM are trademarks of Intel
Corporation or its subsidiaries in the U.S.
and/or other countries. Chrome, Chrome OS,
Chromebook, Google, and Google Drive are
trademarks of Google LLC. SDHC, SDXC,
and microSD are trademarks or registered
trademarks of SD-3C LLC. Microsoft and
Windows are either registered trademarks
or trademarks of Microsoft Corporation in
the United States and/or other countries.
Qualcomm® is a registered trademark of
QUALCOMM INCORPORATED. USB Type-C and
USB-C are registered trademarks of USB
Implementers Forum. DisplayPort™ and the
DisplayPort™ logo are trademarks owned by
the Video Electronics Standards Association
(VESA®) in the United States and other
countries. Wi-Fi is a registered trademark of
Wi-Fi Alliance.
The information contained herein is subject to
change without notice. The only warranties for
HP products and services are set forth in the
express warranty statements accompanying
such products and services. Nothing herein
should be construed as constituting an
additional warranty. HP shall not be liable
for technical or editorial errors or omissions
contained herein.
First Edition: May 2022
Document Part Number: N17304-001
Product notice
This guide describes features that are common
to most models. Some features may not be
available on your computer.
To access the latest user guides, go to
http://www.hp.com/support, and follow the
instructions to nd your product. Then select
Manuals.
Software terms
By installing, copying, downloading, or
otherwise using any software product
preinstalled on this computer, you agree to be
bound by the terms of the HP End User License
Agreement (EULA). If you do not accept these
license terms, your sole remedy is to return the
entire unused product (hardware and software)
within 14 days for a full refund subject to the
refund policy of your seller.
For any further information or to request a
full refund of the price of the computer, please
contact your seller.

Safety warning notice
Reduce the possibility of heat-related injuries or of overheating the computer by following the practices
described.
WARNING! To reduce the possibility of heat-related injuries or of overheating the computer, do not place
the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, at
surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as
pillows or rugs or clothing, to block airow. Also, do not allow the AC adapter to come into contact with the
skin or a soft surface, such as pillows or rugs or clothing, during operation. The computer and the AC adapter
comply with the user-accessible surface temperature limits dened by applicable safety standards.
iii

Table of contents
1Product description................................................................................................................................................................1
2Components...........................................................................................................................................................................3
Right...................................................................................................................................................................................3
Left.....................................................................................................................................................................................4
Display ...............................................................................................................................................................................6
Low blue-light mode (select products only) .............................................................................................................6
Keyboard area.................................................................................................................................................................... 7
Touchpad ...................................................................................................................................................................7
Power key and ngerprint reader..............................................................................................................................8
Special keys ...............................................................................................................................................................8
Bottom ...............................................................................................................................................................................9
Labels...............................................................................................................................................................................10
3Illustrated parts catalog ......................................................................................................................................................12
Computer major components..........................................................................................................................................12
Display assembly subcomponents..................................................................................................................................14
Miscellaneous parts.........................................................................................................................................................16
4Removal andreplacement procedures preliminary requirements.....................................................................................19
Tools required..................................................................................................................................................................19
Service considerations.....................................................................................................................................................19
Plastic parts .............................................................................................................................................................19
Cables and connectors.............................................................................................................................................19
Drive handling..........................................................................................................................................................19
Electrostatic discharge information................................................................................................................................20
Generating static electricity ....................................................................................................................................20
Preventing electrostatic damage to equipment.....................................................................................................21
Personal grounding methods and equipment ........................................................................................................21
Grounding the work area.........................................................................................................................................22
Recommended materials and equipment...............................................................................................................22
Cleaning your computer ..................................................................................................................................................23
Enabling HP Easy Clean (select products only) .......................................................................................................23
Removing dirt and debris from your computer.......................................................................................................23
Cleaning your computer with a disinfectant ...........................................................................................................24
Caring for wood veneer (select products only) .......................................................................................................25
Packaging and transporting guidelines ..........................................................................................................................25
Accessing support information .......................................................................................................................................25
5Removal and replacement procedures for authorized service provider parts...................................................................28
iv

Component replacement procedures..............................................................................................................................28
Preparation for disassembly ...................................................................................................................................28
Bottom cover ...........................................................................................................................................................28
Battery .....................................................................................................................................................................30
Solid-state drive ......................................................................................................................................................31
WLAN module ..........................................................................................................................................................33
WWAN module .........................................................................................................................................................35
Speakers ..................................................................................................................................................................36
Fan ...........................................................................................................................................................................37
Touchpad .................................................................................................................................................................38
USB board ................................................................................................................................................................39
Lock bracket.............................................................................................................................................................41
Card reader ..............................................................................................................................................................42
Fingerprint reader and board ..................................................................................................................................43
Heat sink ..................................................................................................................................................................45
System board...........................................................................................................................................................46
Display assembly.....................................................................................................................................................49
Top cover with keyboard..........................................................................................................................................57
6Backing up, resetting, and recovering .................................................................................................................................58
Backing up .......................................................................................................................................................................58
Resetting..........................................................................................................................................................................58
Recovering .......................................................................................................................................................................58
Installing the Chromebook Recovery Utility ...........................................................................................................59
Creating recovery media..........................................................................................................................................59
Recovering the Chrome operating system..............................................................................................................59
Setting up your computer after a reset or recovery .......................................................................................................60
Erasing and reformatting the recovery media................................................................................................................60
7Specications.......................................................................................................................................................................61
Computer specications ..................................................................................................................................................61
35.6 cm (14.0 in) display specications ..........................................................................................................................61
Solid-state drive specications.......................................................................................................................................62
8Statement of memory volatility ..........................................................................................................................................64
Current BIOS steps...........................................................................................................................................................64
Nonvolatile memory usage .............................................................................................................................................66
Questions and answers ...................................................................................................................................................68
Using HP Sure Start (select products only) .....................................................................................................................70
9Power cord set requirements ..............................................................................................................................................71
Requirements for all countries........................................................................................................................................71
Requirements for specic countries and regions ...........................................................................................................71
10Recycling............................................................................................................................................................................73
Index ........................................................................................................................................................................................74
v

Product description1
This table provides detailed product information.
Table 1-1 Product components and their descriptions
Category Description
Product Name HP Elite c645 14 inch G2 Chromebook™
Processors AMD Ryzen™ processors
AMD Ryzen 7-5825C (2.00 GHz base frequency, up to Standard, 16 MB cache, 8 cores)
AMD Ryzen 5-5625C (2.30 GHz base frequency, up to Standard, 16 MB cache, 6 cores)
AMD Ryzen 3-5425C (2.70 GHz base frequency, up to 4.10 GHz Standard, 8 MB cache, 4 cores)
Graphics Internal graphics
AMD Radeon™ Graphics
Display 14.0 in (35.6 cm), white light-emitting diode (WLED), antiglare
Full high denition (FHD) (1920 × 1080), ultra wide viewing angle (UWVA), 45% NTSC, embedded DisplayPort
(eDP) 1.2 without panel self-refresh (PSR), 250 nits
FHD, UWVA, 45% NTSC, eDP 1.2 without PSR, 250 nits, WWAN
FHD, UWVA, 45% NTSC, eDP 1.2 without PSR, 250 nits, touch-on panel (TOP)
FHD, UWVA, 100% sRGB, eDP 1.3 + PSR, 400 nits
FHD, UWVA, 100% sRGB, eDP 1.3 + PSR, low blue light, 1000 nits, privacy panel, HP Eye Ease certication
High denition (HD) (1366 × 768), standard viewing angle (SVA), 45% NTSC, eDP 1.2 without PSR, 250 nits
Memory Integrated, not customer accessible or upgradeable supporting up to 32 GB of RAM
LPDDR4-4266 dual-channel support
Supports the following congurations:
●32 GB
●16 GB
Primary storage PCIe, Non-Volatile Memory express (NVMe), M.2 solid-state drives (select models only)
512 GB, M2, 2280
256 GB, M2, 2230
128 GB, M2, 2230
embedded MultiMedia Controller (eMMC) 5.0 (select models only)
64 GB
Product description 1

Table 1-1 Product components and their descriptions (continued)
Category Description
Audio andvideo B&O Play
Dual speakers
5 MP camera, narrow eld-of-view (NFOV), USB2
Dual-array digital microphone with appropriate software: beam forming, echo cancellation, noise suppression
Wireless Wireless Local Area Network (WLAN)
Qualcomm® Fast Connect 6900 Wi-Fi 6E Bluetooth® 5.2 WLAN
Wireless Wide Area Network (WWAN) (select products only)
Intel® XMM™ 7360 LTE-Advanced (Cat 9)
Media card reader Supports microSD™, SDHC™, SDXC™
Ports HDMI™ v2.0
USB Type-C®
USB 3.2 Gen 1 Type-A (2) (models without WWAN)
-or-
USB 3.2 Gen 1 Type-A (1) (models with WWAN)
Keyboard/pointing
devices
Keyboard (island style, spill resistant)
3-coat paint, backlit
3-coat paint, backlit, privacy
Textured
Power requirements Battery
3 cell, 58 Whr, polymer, HP Long Life
HP Fast Charge Technology
Smart AC adapters (USB Type-C, non power factor correction, (nPFC), straight, 1.8 m [6 ft])
65 W
45 W
Power cord
C5, conventional, 1 m (3.3 ft)
Security Integrated ngerprint touch sensor (select products only)
Kensington nano security lock
Active SmartCard (select products only)
Operating system Google Chrome™ 64
Chrome with Chrome Education Upgrade
Chrome with Chrome Enterprise Upgrade
Serviceability End user replaceable parts
AC adapter
2 Chapter 1Product description

Components2
Your computer features top-rated components. This chapter provides details about your components, where
they are located, and how they work.
Right
Use the illustration and table to identify the components on the right side of the computer.
Table 2-1 Right-side components and their descriptions
Component Description
(1) SIM card slot (select products only) Supports a wireless subscriber identity module (SIM) card.
(2) Security cable slot Attaches an optional security cable to the computer.
NOTE: The security cable is designed to act as a deterrent,
but it might not prevent the computer from being
mishandled or stolen.
(3) AC adapter and battery light ●White: The AC adapter is connected and the battery is
fully charged.
●Amber: The AC adapter is connected and the battery is
charging.
●Blinking amber: The battery has an error.
●O: The battery is not charging.
Components 3

Table 2-1 Right-side components and their descriptions (continued)
Component Description
(4) USB Type-C® power connector and
SuperSpeed port
Connects an AC adapter that has a USB Type-C connector,
supplying power to the computer and, if needed, charging
the computer battery.
– and –
Connects a USB device, provides high-speed data transfer,
and (for select products) charges small devices (such as a
smartphone) when the computer is on or in Sleep mode.
NOTE: Use a standard USB Type-C charging cable or cable
adapter (purchased separately) when charging a small
external device.
– and –
Connects a display device that has a USB Type-C connector,
providing DisplayPort™ output.
(5) USB SuperSpeed port (select products only) Connects a USB device, provides high-speed data transfer,
and (for select products) charges small devices (such as a
smartphone) when the computer is on or in Sleep mode.
NOTE: Use a standard USB Type-A charging cable or cable
adapter (purchased separately) when charging a small
external device.
(6) Audio-out (headphone)/Audio-in
(microphone) combo jack
Connects optional powered stereo speakers, headphones,
earbuds, a headset, or a television audio cable. Also
connects an optional headset microphone. This jack does not
support optional standalone microphones.
WARNING! To reduce the risk of personal injury, adjust the
volume before putting on headphones, earbuds, or a
headset. For additional safety information, see the
Regulatory, Safety, and Environmental Notices.
NOTE: When a device is connected to the jack, the
computer speakers are disabled.
Left
Use the illustration and table to identify the components on the left side of the computer.
4 Chapter 2Components

Table 2-2 Left-side components and their descriptions
Component Description
(1) HDMI port Connects an optional video or audio device, such as a
high-denition television, any compatible digital or audio
component, or a high-speed High Denition Multimedia
Interface (HDMI) device.
(2) USB SuperSpeed port Connects a USB device, provides high-speed data transfer,
and (for select products) charges small devices (such as a
smartphone) when the computer is on or in Sleep mode.
NOTE: Use a standard USB Type-A charging cable or cable
adapter (purchased separately) when charging a small
external device.
(3) USB Type-C® power connector and
SuperSpeed port
Connects an AC adapter that has a USB Type-C connector,
supplying power to the computer and, if needed, charging the
computer battery.
– and –
Connects a USB device, provides high-speed data transfer,
and (for select products) charges small devices (such as a
smartphone) when the computer is on or in Sleep mode.
NOTE: Use a standard USB Type-C charging cable or cable
adapter (purchased separately) when charging a small
external device.
– and –
Connects a display device that has a USB Type-C connector,
providing DisplayPort™ output.
(4) AC adapter and battery light ●White: The AC adapter is connected and the battery is
fully charged.
●Amber: The AC adapter is connected and the battery is
charging.
●Blinking amber: The battery has an error.
●O: The battery is not charging.
(5) microSD™ memory card reader Reads optional memory cards that store, manage, share, or
access information.
To insert a card:
1. Hold the card label-side up, with the connectors facing
the computer.
2. Insert the card into the memory card reader, and then
press in on the card until it is rmly seated.
To remove a card:
▲Press in on the card, and then remove it from the
memory card reader.
(6) Smart card reader (select products only) Supports optional smart cards.
Left 5

Display
Use the illustration and table to identify the display components.
Low blue-light mode (select products only)
Your computer display is shipped from the factory in low blue-light mode for improved eye comfort and
safety. Blue-light mode also automatically adjusts blue-light emissions when you are using the computer at
night or for reading.
WARNING! To reduce the risk of serious injury, read the Safety & Comfort Guide. It describes proper
workstation setup and proper posture, health, and work habits for computer users. The Safety & Comfort
Guide also provides important electrical and mechanical safety information. The Safety & Comfort Guide is
available on the web at http://www.hp.com/ergo.
Table 2-3 Display components and their descriptions
Component Description
(1) WWAN antennas* (select products only) Send and receive wireless signals to communicate with wireless wide
area networks (WWANs).
(2) WLAN antennas* Send and receive wireless signals to communicate with wireless local
area networks (WLANs).
(3) Ambient light sensor (select products only) Adjusts the brightness of the display, depending on the ambient light.
(4) Internal microphones Record sound.
(5) Camera Allows you to video chat, record video, and record still images.
NOTE: Camera functions vary depending on the camera hardware
and software installed on your product.
6 Chapter 2Components

Table 2-3 Display components and their descriptions (continued)
Component Description
(6) Camera privacy cover By default, the camera lens is uncovered, but you can slide the
camera privacy cover to block the camera's view. To use the camera,
slide the camera privacy cover in the opposite direction to reveal the
lens.
(7) Camera light On (white): The camera is in use.
O: The camera is turned o by the software.
*The antennas are not visible from outside the computer. For optimal transmission, keep the areas immediately around the antennas
free from obstructions.
For wireless regulatory notices, see the section of the Regulatory, Safety, and Environmental Notices that applies to your country or
region.
Keyboard area
Keyboards can vary by language.
Touchpad
The touchpad settings and components are described here.
Table 2-4 Touchpad component and description
Component Description
Touchpad zone Reads your nger gestures to move the pointer or activate items on the screen.
Keyboard area 7

Power key and ngerprint reader
Fingerprint readers can be located on the touchpad, on a side panel of the computer, or on the top cover below
the keyboard.
Table 2-5 Power key and ngerprint reader and their descriptions
Component Description
(1) Power key ●When the computer is o, press the key briey to turn on
the computer.
●When the computer is on, press the key briey to initiate
Sleep.
●When the computer is in the Sleep state, press the key
briey to exit Sleep (select products only).
IMPORTANT: Pressing and holding down the power key results
in the loss of unsaved information.
If the computer has stopped responding and shutdown
procedures are ineective, press and hold the power key for at
least 10 seconds to turn o the computer.
(2) Fingerprint reader (select products only) The ngerprint reader allows you to unlock the computer screen
or to resume computer operations. The reader does not function
as a login device.
▲Touch your nger to the ngerprint reader.
Special keys
Use the illustration and table to locate the special keys.
8Chapter 2Components

NOTE: Your computer might look slightly dierent than the illustration in this section.
Table 2-6 Special keys and their descriptions
Component Description
(1) esc key Activates certain computer functions when pressed in
combination with other keys, such as tab or shift.
(2) Search key Opens a search box.
(3) Action keys Execute frequently used system functions.
Bottom
Use the illustration and table to identify the bottom components.
Bottom 9

Table 2-7 Bottom components and their descriptions
Components Description
(1) Speakers Produce sound.
(2) Vent Enables airow to cool internal components.
NOTE: The computer fan starts automatically to cool internal
components and prevent overheating. It is normal for the internal
fan to cycle on and o during routine operation.
Labels
The labels aixed to the computer provide information you might need when you troubleshoot system
problems or travel internationally with the computer. Labels might be in paper form or imprinted on the
product.
IMPORTANT: Check the following locations for the labels described in this section: the bottom of the
computer, inside the battery bay, under the service door, on the back of the display, or on the bottom of a
tablet kickstand.
●Service label—Provides important information to identify your computer. When contacting support, you
might be asked for the serial number, the product number, or the model number. Locate this information
before you contact support.
Your service label will resemble one of the following examples. Refer to the illustration that most closely
matches the service label on your computer.
Table 2-8 Service label components
Component
(1) Serial number
(2) Product ID
(3) HP product name
10 Chapter 2Components

Table 2-9 Service label components
Component
(1) HP product name
(2) Product ID
(3) Serial number
(4) Warranty period
Table 2-10 Service label components
Component
(1) HP product name
(2) Warranty period
(3) Product ID
(4) Serial number
●Regulatory labels—Provide regulatory information about the computer.
●Wireless certication labels—Provide information about optional wireless devices and the approval
markings for the countries or regions where the devices have been approved for use.
Labels 11

Illustrated parts catalog3
Use this chapter to determine the spare parts that are available for the computer.
Computer major components
To identify the computer major components, use this illustration and table.
12 Chapter 3Illustrated parts catalog

Table 3-1 Computer major component descriptions and part numbers
Item Component Spare part number
(1) Display assembly
NOTE: Display assemblies are oered as spare parts only at a subcomponent level. For more
information, see Display assembly subcomponents on page 14.
not available as a
spare part
(2) Top cover with keyboard
For a detailed list of country codes, see Top cover with keyboard on page 57.
Backlit, WWAN models N15102-xx1
Backlit, privacy, WWAN models N15106-xx1
Backlit, models without WWAN N15104-xx1
Backlit, privacy, models without WWAN N15103-xx1
Not backlit, models without WWAN N15105-xx1
(3) Touchpad (includes bracket)
NOTE: The touchpad cable with Mylar is available using spare part number N14811-001.
N12916-001
(4) Speakers (left and right) N12919-001
(5) System board (includes processor)
NOTE: The system board repair kit is available as spare part number N19985-888.
The system board bracket is available in the Bracket Kit as spare part number N18576-001.
For use in models without WWAN:
●AMD Ryzen 7-5825C processor and 16 GB of system memory N12896-001
●AMD Ryzen 5-5625C processor and 16 GB of system memory N12893-001
●AMD Ryzen 5-5625C processor and 8 GB of system memory N12895-001
●AMD Ryzen 5-5625C processor and 8 GB of system memory and 64 GB of eMMC storage N12894-001
●AMD Ryzen 3-5425C processor and 8 GB of system memory and 64 GB of eMMC storage N12892-001
For use in models with WWAN:
●AMD Ryzen 7-5825C processor and 16 GB of system memory N22020-001
●AMD Ryzen 5-5625C processor and 16 GB of system memory N22017-001
●AMD Ryzen 5-5625C processor and 8 GB of system memory N22018-001
●AMD Ryzen 5-5625C processor and 8 GB of system memory and 64 GB of eMMC storage N22019-001
●AMD Ryzen 3-5425C processor and 8 GB of system memory and 64 GB of eMMC storage N22016-001
(6) Heat sink N12917-001
(7) Fan N12918-001
(8) Fingerprint reader board N18574-001
(9) Fingerprint reader
NOTE: The ngerprint reader cable is available using spare part number N18575-001.
The ngerprint reader bracket is available in the Bracket Kit as spare part number N18576-001.
N14814-001
Computer major components 13

Table 3-1 Computer major component descriptions and part numbers (continued)
Item Component Spare part number
(10) WLAN module (Qualcomm Fast Connect 6900 Wi-Fi 6E Bluetooth 5.2 WLAN)
NOTE: The WLAN bracket is available in the Bracket Kit as spare part number N18576-001.
N17383-001
(11) WWAN module (Intel XMM 7360 LTE-Advanced [Cat 9])
NOTE: The WWAN bracket is available in the Bracket Kit as spare part number N18576-001.
N13692-001
(12) USB board
NOTE: The USB board cable is available using spare part number N12910-001 for models with
WWAN and N12911-001 for models without WWAN.
USB board brackets are available in the Bracket Kit as spare part number N18576-001.
For use in models with WWAN N12908-001
For use in models with WLAN N12909-001
(13) Smart card reader
NOTE: The smart card reader cable is available using spare part number N18575-001.
The smart card reader bracket is available in the Bracket Kit as spare part number N18576-001.
N12914-001
(14) Battery (3 cell, 58 Whr)
NOTE: The battery bracket is available in the Bracket Kit as spare part number N18576-001.
M12585-005
(15) Bottom cover
For use in models with WWAN N12890-001
For use in models with WLAN N12891-001
*Solid-state drive (PCIe) (not illustrated)
NOTE: The solid-state drive bracket is available in the Bracket Kit as spare part number
N18576-001.
512 GB N17382-001
256 GB N17381-001
128 GB N17380-001
*not illustrated
Display assembly subcomponents
To identify the display assembly subcomponents, use this illustration and table.
14 Chapter 3Illustrated parts catalog

Table 3-2 Display component descriptions and part numbers
Item Component Spare part number
(1) Display bezel (includes hinge cover)
For use in privacy models N12924-001
For use in nonprivacy models N12925-001
(2) Camera module N12929-001
(3) Display panel (includes panel adhesive)
NOTE: The panel tape kit is available as spare part number N13937-001.
FHD, 250 nits, touch-on panel (TOP) N12897-001
FHD, 250 nits N12898-001
FHD, 250 nits, WWAN N22021-001
FHD, 400 nits N12899-001
Display assembly subcomponents 15