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

Document Part Number: L93860-001

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, flat 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 airflow 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

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 pec c t ons ..............................................................................................................................................	53
Computer speci cations ......................................................................................................................................	53
35.6 cm (14.0 in) display speci cations ..............................................................................................................	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 speci c countries and regions ................................................................................................	61
10 Recycling ..................................................................................................................................................	63

vi

Index .............................................................................................................................................................

65

vii

viii

1Product 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 de nition (FHD) (1920 × 1080), UWVA, 220 nits
	High de nition (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 con gurations
	●	16 GB
	●	8 GB
Primary storage	On-board embedded MultiMedia Controller (eMMC v5.0) con ur t ons
	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	Google Keyboard
	devices
		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
	Power requirements	Battery
		3 cell, 60 Whr, polymer, HP Long Life
		AC adapter, USB Type-C
		65 W, nPFC, straight
		45 W, nPFC, straight

2Chapter 1 Product description

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

4Chapter 1 Product description

2Components

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)	Connects optional powered stereo speakers, headphones,
	combo jack	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.
(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.

5

Table 2-1 Right-side components and their descriptions (continued)

Component		Description
		●	Blinking amber: The battery has an error.
		●	The battery is not charging.
(4)	USB Type-C power connector and SuperSpeed	Connects an AC adapter that has a USB Type-C connector,
	Plus port	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.
(5)	USB SuperSpeed port	Connects a USB device, such as a cell phone, camera, activity
		tracker, or smartwatch, and provides high-speed data transfer.

Left side

Use the illustration and table to identify the components on the left side of the computer.

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
		tracker, or smartwatch, and provides high-speed data transfer.
(2)	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.
(3)	USB Type-C power connector and SuperSpeed	Connects an AC adapter that has a USB Type-C connector,
	Plus port	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.

6Chapter 2 Components

Table 2-2 Left-side components and their descriptions (continued)

Component		Description
(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.

		●	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.

Display

The computer display can include essential components such as antennas, cameras, and microphones.

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.
		NOTE: Camera functions vary depending on the camera hardware
		and software installed on your product.
(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.

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.

*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.

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
	screen.

8Chapter 2 Components

Button, speakers and n erpr nt reader

Identify the button, speakers, and ngerprint reader.

Table 2-5 Button, speakers, and n erpr nt reader and their descriptions

Component		Description
(1)	Speakers	Produce sound.
(2)	Vent	Enables airflow 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 briefly to
			turn on the computer.
		●	When the computer is on, press the button briefly to
			initiate Sleep.
		●	When the computer is in the Sleep state, press the
			button briefly to exit Sleep (select products only).
		●	When the computer is in Hibernation, press the button
			briefly 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 ine ective 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	n erpr nt reader and their descriptions (continued)
Component	Description
	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.

Special keys

Identify the special keys.

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)	Action keys	Execute frequently used system functions.
(3)	Power button	●	When the computer is o press the button briefly to turn
			on the computer.
		●	When the computer is on, press the button briefly to
			initiate Sleep.
		●	When the computer is in the Sleep state, press the button
			briefly to exit Sleep (select products only).
		●	When the computer is in Hibernation, press the button
			briefly 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 ine ective press and hold the power button for at least 4 seconds to turn o the computer.

Bottom

Identify the bottom component.

10 Chapter 2 Components

Table 2-7 Bottom component and description

Component	Description
Vent	Enables airflow airflow 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.

Labels

The labels affixed 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 certi cation 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

3Illustrated 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)		M00437-001
	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	M00695-001
	with a ngerprint sensor)
	Intel Core i7-10610U processor, 16 GB of system memory, and 64 GB of eMMC memory (models	M00694-001
	with a ngerprint sensor)
	Intel Core i5-10310U processor, 16 GB of system memory, and 128 GB of eMMC memory (models	M00691-001
	with a ngerprint sensor)
	Intel Core i5-10310U processor, 16 GB of system memory, and 64 GB of eMMC memory (models	M00690-001
	with a ngerprint sensor)
	Intel Core i5-10310U processor, 8 GB of system memory, and 64 GB of eMMC memory (models with	M00687-001
	a ngerprint sensor)
	Intel Core i3-10110U processor, 8 GB of system memory, and 64 GB of eMMC memory (models with	M00685-001
	a ngerprint sensor)
	Intel Pentium 6405U processor, 8 GB of system memory, and 32 GB of eMMC memory (models	M00696-001
	without a ngerprint sensor)
	Intel Pentium 6405U processor, 8 GB of system memory, and 32 GB of eMMC memory (models with	M00698-001
	a ngerprint sensor)
(12)	USB door
	Left door	M00444-001

14 Chapter 3 Illustrated parts catalog

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