HP Chromebook c640 Service manual
Maintenance and Service Guide
SUMMARY
This guide provides information about spare parts, removal and replacement of parts, security, backing up, and more.
© Copyright 2020 HP Development Company,
L.P.
Bluetooth is a trademark owned by its
proprietor and used by HP Inc. under license.
Chrome, Chrome OS, Chromebook, Chromecast,
Google, and Google Drive are trademarks of
Google LLC. Intel, Core, and Pentium are
trademarks of Intel Corporation or its
subsidiaries in the U.S. and/or other countries.
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. USB
Type-C® is a registered trademark of USB
Implementers Forum.
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: June 2020
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.
Document Part Number: L93860-001
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 airow. 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 dened by applicable safety standards.
iii
iv Safety warning notice
Table of contents
1 Product description ....................................................................................................................................... 1
2 Components .................................................................................................................................................. 5
Right side ............................................................................................................................................................... 5
Left side ................................................................................................................................................................. 6
Display .................................................................................................................................................................... 7
Keyboard area ........................................................................................................................................................ 8
Touchpad ............................................................................................................................................. 8
Button, speakers and ngerprint reader ............................................................................................ 9
Special keys ....................................................................................................................................... 10
Bottom ................................................................................................................................................................. 10
Labels ................................................................................................................................................................... 11
3 Illustrated parts catalog .............................................................................................................................. 13
Computer major components .............................................................................................................................. 13
Display assembly subcomponents ...................................................................................................................... 15
Cables ................................................................................................................................................................... 16
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
Workstation guidelines ..................................................................................................................... 20
Electrostatic discharge information .................................................................................................................... 20
Generating static electricity .............................................................................................................. 21
Preventing electrostatic damage to equipment ............................................................................... 21
Personal grounding methods and equipment .................................................................................. 22
Grounding the work area ................................................................................................................... 22
Recommended materials and equipment ........................................................................................ 22
Packaging and transporting guidelines .............................................................................................................. 23
5 Removal and replacement procedures for authorized service provider parts .................................................... 25
Component replacement procedures .................................................................................................................. 25
v
Preparation for disassembly ............................................................................................................. 25
Bottom cover ..................................................................................................................................... 25
Battery ............................................................................................................................................... 26
Speakers ............................................................................................................................................ 28
Touchpad ........................................................................................................................................... 29
Fingerprint sensor board .................................................................................................................. 31
Fan ..................................................................................................................................................... 32
Heat sink ............................................................................................................................................ 33
USB board .......................................................................................................................................... 35
USB door ............................................................................................................................................ 35
System board .................................................................................................................................... 38
Display assembly ............................................................................................................................... 40
Keyboard with top cover ................................................................................................................... 48
6 Backing up, resetting, and recovering ........................................................................................................... 51
Backing up ............................................................................................................................................................ 51
Resetting .............................................................................................................................................................. 51
Recovering ........................................................................................................................................................... 51
Installing the Chromebook Recovery Utility ..................................................................................... 51
Creating recovery media ................................................................................................................... 52
Recovering the Chrome operating system ....................................................................................... 52
Setting up your computer after a reset or recovery ........................................................................................... 52
Erase and reformat the recovery media .............................................................................................................. 52
7 Specications .............................................................................................................................................. 53
Computer specications ...................................................................................................................................... 53
35.6 cm (14.0 in) display specications .............................................................................................................. 53
8 Statement of memory volatility .................................................................................................................... 55
Current BIOS steps ............................................................................................................................................... 55
Nonvolatile memory usage ................................................................................................................................. 57
Questions and answers ....................................................................................................................................... 59
Using HP Sure Start (select products only) ......................................................................................................... 60
9 Power cord set requirements ........................................................................................................................ 61
Requirements for all countries ............................................................................................................................ 61
Requirements for specic countries and regions ................................................................................................ 61
10 Recycling .................................................................................................................................................. 63
vi
Index ............................................................................................................................................................. 65
vii
viii
1 Product description
This table provides detailed product information.
Table 1-1 Product components and their descriptions
Category Description
Product Name HP Pro c640 Chromebook
Processors 10th Generation Intel® Core™ processors
Intel Core i7-10610U (1.8 GHz [turbo up to 4.9 GHz], 4 cores, 8 MB L3 cache, 15 W)
Intel Core i7-10510U (1.8 GHz [turbo up to 4.9 GHz], 4 cores, 8 MB L3 cache, 15 W)
Intel Core i5-10310U (1.7 GHz [turbo up to 4.4 GHz], 4 cores, 6 MB L3 cache, 15 W)
Intel Core i5-10210U (1.6 GHz [turbo up to 4.2 GHz], 4 cores, 6 MB L3 cache, 15 W)
Intel Core i3-10110U (2.1 GHz [turbo up to 4.1 GHz], 2 cores, 4 MB L3 cache, 15 W)
Intel Pentium® Gold 6405U (2.4 GHz, 2 cores, 2 MB L3 cache, 15 W)
Graphics Internal graphics
Intel UHD Graphics
Supports HD Decode, DX12, and HDMI
Display 35.6 cm (14.0 in), WLED, antiglare, eDP, slim (3.0 mm), narrow bezel, nontouch
Full high denition (FHD) (1920 × 1080), UWVA, 220 nits
High denition (HD) (1366 × 768), SVA, 250 nits
35.6 cm (14.0 in), slim (3.0 mm), narrow bezel, touch screen
FHD, antiglare, UWVA, 250 nits
HD, antiglare, SVA, 220 nits
HD, BrightView, SVA, 220 nits
Memory Soldered on board, nonupgradeable
DDR4-2666 dual-channel support
Supports the following congurations:
● 16 GB
● 8 GB
Primary storage On-board embedded MultiMedia Controller (eMMC v5.0) congurations
128 GB
64 GB
32 GB
Audio and video HD audio
1
Table 1-1 Product components and their descriptions (continued)
Category Description
B&O Play
Dual stereo speakers
HD Camera: HD WFOV + dual microphones
1280 × 720 by 30 frames per second
Dual-array digital microphone with appropriate software: beam forming, echo cancellation, noise
suppression
Camera privacy cover
Wireless Integrated wireless options with dual antennas (M.2/PCIe)
Intel Wi-Fi 6 AX201 + Bluetooth® 5 (non-vPro) (802.11ax 2 × 2, MU-MIMO, supporting gigabit le transfer
speeds)
Supports HP Connection Optimizer with Wi-Fi load balancing
Support for Chromecast™
Supports turbo-lite antenna design (extended range wireless LAN)
Wi-Fi BIOS SAR
Media card reader Supports microSD™, SDHC™, SDXC™ up to UHS-104
Push-push insertion/removal
Ports Hot plug/unplug and autodetect for correct output to wide-aspect vs. standard aspect video
HDMI v1.4b supporting: up to 1920 × 1080 @ 60 Hz via USB Type-C®
Audio-out (headphone)/audio-in (microphone) combo jack
(2) USB 3.1 Gen 1 Type C (right and left side; support charging, power delivery, video, and data)
(2) USB 3.1 Gen 1 Type A (right and left side)
Keyboard/pointing
devices
Power requirements Battery
Google Keyboard
Full size, textured, island style, spill resistant, backlit
Full size, textured, island style, spill resistant, not backlit
Full size, 3-coat paint, island style, backlit, ngerprint sensor
Full size, 3-coat paint, island style, not backlit, ngerprint sensor
Touchpad requirements
Multitouch gestures enabled
Taps enabled as default
3 cell, 60 Whr, polymer, HP Long Life
2 Chapter 1 Product description
AC adapter, USB Type-C
65 W, nPFC, straight
45 W, nPFC, straight
Table 1-1 Product components and their descriptions (continued)
Category Description
Power cord
C5, 1 m
Security Nano security lock slot
Fingerprint sensor (select products only)
H1 Secure Microcontroller
Operating system Google® Chrome™ 64
Serviceability End user replaceable parts
AC adapter
3
4 Chapter 1 Product description
2 Components
Your computer features top-rated components. This chapter provides details about your components, where
they are located, and how they work.
Right side
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) Memory card reader Reads optional memory cards that enable you to store, manage,
share, or access information.
To insert a card:
1. Hold the card label-side up, with 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.
(2) Audio-out (headphone)/Audio-in (microphone)
combo jack
(3) AC adapter and battery light ● White: The AC adapter is connected and the battery is fully
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.
charged.
● Amber: The AC adapter is connected and the battery is
charging.
5
Table 2-1 Right-side components and their descriptions (continued)
Component Description
● Blinking amber: The battery has an error.
● O: The battery is not charging.
(4) USB Type-C power connector and SuperSpeed
(5) USB SuperSpeed port Connects a USB device, such as a cell phone, camera, activity
Left side
Use the illustration and table to identify the components on the left side of the computer.
Plus 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 when the computer
is on or in Sleep mode.
NOTE: Cables, adapters, or both (purchased separately) might
be required.
tracker, or smartwatch, and provides high-speed data transfer.
Table
2-2 Left-side components and their descriptions
Component Description
(1) USB SuperSpeed port Connects a USB device, such as a cell phone, camera, activity
(2) HDMI port Connects an optional video or audio device, such as a high-
(3) USB Type-C power connector and SuperSpeed
6 Chapter 2 Components
Plus port
tracker, or smartwatch, and provides high-speed data transfer.
denition television, any compatible digital or audio component,
or a high-speed High Denition Multimedia Interface (HDMI)
device.
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 when the computer
is on or in Sleep mode.
NOTE: Cables, adapters, or both (purchased separately) might
be required.
Table 2-2 Left-side components and their descriptions (continued)
Component Description
Display
The computer display can include essential components such as antennas, cameras, and microphones.
(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) 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.
Table 2-3 Display components and their descriptions
Component Description
(1) WLAN antennas* Send and receive wireless signals to communicate with wireless local
area networks (WLANs).
(2) WWAN antennas* Send and receive wireless signals to communicate with wireless wide
area networks (WWANs).
(3) Internal microphones Record sound.
(4) Camera light(s) On: One or more cameras are in use.
Display 7
Table 2-3 Display components and their descriptions (continued)
Component Description
(5) Camera(s) Allows(s) you to video chat, record video, and record still images.
(6) Camera privacy cover By default, the camera lens is uncovered, but you can slide the
*The antennas are not visible from the outside of 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.
NOTE: Camera functions vary depending on the camera hardware
and software installed on your product.
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.
NOTE: If you have both front-facing and rear-facing cameras, when
one camera lens is revealed and ready to use, the other is concealed.
Touchpad
Identify the touchpad component.
Table
2-4 Touchpad component and description
Component Description
Touchpad zone Reads your nger gestures to move the pointer or activate items on the
8 Chapter 2 Components
screen.
Button, speakers and ngerprint reader
Identify the button, speakers, and ngerprint reader.
Table 2-5 Button, speakers, and ngerprint reader and their descriptions
Component Description
(1) Speakers Produce sound.
(2) Vent Enables airow to cool internal components.
NOTE: The computer fan starts up automatically to cool
internal components and prevent overheating. It is normal for
the internal fan to cycle on and o during routine operation.
(3) Power button ● When the computer is o, press the button briey to
turn on the computer.
● When the computer is on, press the button briey to
initiate Sleep.
● When the computer is in the Sleep state, press the
button briey to exit Sleep (select products only).
● When the computer is in Hibernation, press the button
briey to exit Hibernation.
IMPORTANT: Pressing and holding down the power button
results in the loss of unsaved information.
If the computer has stopped responding and shutdown
procedures are ineective, press and hold the power button
for at least 4 seconds to turn o the computer.
(4) Fingerprint reader (select products only) Allows a ngerprint logon instead of a password logon.
▲ Swipe down across the ngerprint reader for details.
Keyboard area 9
Table 2-5 Button, speakers, and ngerprint reader and their descriptions (continued)
Component Description
Special keys
Identify the special keys.
IMPORTANT: To prevent ngerprint logon issues, be sure
that when you register your ngerprint that all sides of your
nger are registered by the ngerprint reader.
Table 2-6 Special keys and their descriptions
Component Description
(1) esc key Activates certain computer functions when pressed in
(2) Action keys Execute frequently used system functions.
(3) Power button ● When the computer is o, press the button briey to turn
Bottom
combination with other keys, such as tab or shift.
on the computer.
● When the computer is on, press the button briey to
initiate Sleep.
● When the computer is in the Sleep state, press the button
briey to exit Sleep (select products only).
● When the computer is in Hibernation, press the button
briey to exit Hibernation.
IMPORTANT: Pressing and holding down the power button
results in the loss of unsaved information.
If the computer has stopped responding and shutdown
procedures are ineective, press and hold the power button for
at least 4 seconds to turn o the computer.
Identify the bottom component.
10 Chapter 2 Components
Labels
Table 2-7 Bottom component and description
Component Description
Vent Enables airow airow to cool internal components.
NOTE: The computer fan starts up automatically to cool internal
components and prevent overheating. It is normal for the internal fan to
cycle on and o during routine operation.
The labels axed to the computer provide information you may need when you troubleshoot system
problems or travel internationally with the computer. Labels may 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
may be asked for the serial number, the product number, or the model number. Locate this information
before you contact support.
Your service label information order may vary by country and might not include the wording "Model" due
to the country regulation.
Labels 11
Table 2-8 Service label components
Component
(1) HP product name
(2) Product ID
(3) Serial number
(4) Warranty period
● Regulatory label(s)—Provide(s) regulatory information about the computer.
● Wireless certication label(s)—Provide(s) information about optional wireless devices and the approval
markings for the countries or regions in which the devices have been approved for use.
12 Chapter 2 Components
3 Illustrated parts catalog
Use this table 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.
NOTE: HP continually improves and changes product parts. For complete and current information about
supported parts for your computer, go to http://partsurfer.hp.com, select your country or region, and then
follow the on-screen instructions.
NOTE: Details about your computer, including model, serial number, product key, and length of warranty,
are on the service tag at the bottom of your computer.
Computer major components 13
Table 3-1 Computer major component descriptions and part numbers
Item Component Spare part number
(1) Display assembly
NOTE: Display assemblies are spared only at the subcomponent level.
(2) Top cover with keyboard
3-coat paint, backlit, with ngerprint sensor M03451-xx1
3-coat paint, backlit, without ngerprint sensor M03452-xx1
Textured, not backlit, without ngerprint sensor M03453-xx1
Textured, not backlit, with ngerprint sensor M03454-xx1
(3) Touchpad (includes rubber)
NOTE: The touchpad cable is available in the Cable Kit as spare part number M00703-001.
(4) Fingerprint sensor board (includes cable) M00438-001
(5) Battery (3 cell, 60 Whr) L84398-002
(6) Speaker Kit M00436-001
(7) USB board M00433-001
(8) USB cables (included in Cable Kit) M00703-001
(9) Heat sink M00434-001
(10) Fan M02014-001
(11) System board (includes integrated processor, system memory, and eMMC memory; includes
replacement thermal material)
Intel Core i7-10610U processor, 16 GB of system memory, and 128 GB of eMMC memory (models
with a ngerprint sensor)
Intel Core i7-10610U processor, 16 GB of system memory, and 64 GB of eMMC memory (models
with a ngerprint sensor)
Intel Core i5-10310U processor, 16 GB of system memory, and 128 GB of eMMC memory (models
with a ngerprint sensor)
Intel Core i5-10310U processor, 16 GB of system memory, and 64 GB of eMMC memory (models
with a ngerprint sensor)
M00437-001
M00695-001
M00694-001
M00691-001
M00690-001
Intel Core i5-10310U processor, 8 GB of system memory, and 64 GB of eMMC memory (models with
a ngerprint sensor)
Intel Core i3-10110U processor, 8 GB of system memory, and 64 GB of eMMC memory (models with
a ngerprint sensor)
Intel Pentium 6405U processor, 8 GB of system memory, and 32 GB of eMMC memory (models
without a ngerprint sensor)
Intel Pentium 6405U processor, 8 GB of system memory, and 32 GB of eMMC memory (models with
a ngerprint sensor)
(12) USB door
Left door M00444-001
14 Chapter 3 Illustrated parts catalog
M00687-001
M00685-001
M00696-001
M00698-001
Table 3-1 Computer major component descriptions and part numbers (continued)
Item Component Spare part number
Right door M00445-001
(13) Bottom cover M00432-001
Display assembly subcomponents
To identify the display assembly subcomponents, use this illustration and table.
Table 3-2 Display component descriptions and part numbers
Item Component Spare part number
(1) Display bezel M00701-001
(2) Display panel
FHD, nontouch M00446-001
FHD, touch M00447-001
HD, nontouch M00448-001
HD, touch M00449-001
Display assembly subcomponents 15
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