Dell 7520 Installation Manual

Dell Precision 7520

Owner's Manual

Reg ula tor y M ode l: P53 F Reg ula tor y T ype : P 53F 002 Apr il 202 1 Rev . A 05

Notes, cautions, and warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid

the problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

© 2017 2019 Dell Inc. or its subsidiaries. All rights reserved. Del l, EMC , and other trademarks are trademarks of Dell Inc. or its subsidiar ies . Other trademarks may be trademarks of their respective owners.

Chapter 1: Working on your computer............................................................................................7

Safety instructions.............................................................................................................................................................. 7

Turning off your — Windows........................................................................................................................................... 7

Before working inside your computer.............................................................................................................................8

After working inside your computer................................................................................................................................8

Chapter 2: Disassembly and reassembly........................................................................................ 9

Recommended tools........................................................................................................................................................... 9

SD card................................................................................................................................................................................. 10

Removing SD card....................................................................................................................................................... 10

Installing SD card..........................................................................................................................................................10

Battery cover...................................................................................................................................................................... 10

Removing the battery cover......................................................................................................................................10

Installing the battery cover........................................................................................................................................10

Battery...................................................................................................................................................................................11

Lithium-ion battery precautions................................................................................................................................ 11

Removing the battery.................................................................................................................................................. 11

Installing the battery.................................................................................................................................................... 11

Hard drive............................................................................................................................................................................ 12

Removing the hard drive............................................................................................................................................ 12

Installing the hard drive.............................................................................................................................................. 13

Hard drive cable connector............................................................................................................................................. 13

Removing the hard drive cable connector............................................................................................................. 13

Installing the hard drive cable connector............................................................................................................... 13

Keyboard lattice and Keyboard.......................................................................................................................................14

Removing the keyboard..............................................................................................................................................14

Installing the keyboard................................................................................................................................................ 15

Base cover........................................................................................................................................................................... 15

Removing the base cover...........................................................................................................................................15

Installing the base cover.............................................................................................................................................16

SIM card............................................................................................................................................................................... 16

Removing the SIM card.............................................................................................................................................. 16

Installing the SIM card.................................................................................................................................................17

Memory modules................................................................................................................................................................ 17

Removing the primary memory module.................................................................................................................. 17

Installing the primary memory module.................................................................................................................... 18

Removing the secondary memory module............................................................................................................. 18

Installing the secondary memory module............................................................................................................... 19

WWAN card.........................................................................................................................................................................19

Removing Wireless Wide Area Network - WWAN card...................................................................................... 19

Installing the WWAN card ........................................................................................................................................ 20

WLAN card..........................................................................................................................................................................20

Removing the Wireless Local Area Network - WLAN card............................................................................... 20

Installing the WLAN Card........................................................................................................................................... 21

Contents 3

Solid State Drive ............................................................................................................................................................... 21

Removing the M.2 Solid State Drive -SSD module..............................................................................................21

Installing the M.2 SSD module................................................................................................................................. 22

Coin-cell battery................................................................................................................................................................ 22

Removing the coin cell battery................................................................................................................................ 22

Installing the coin cell battery...................................................................................................................................23

Power connector port...................................................................................................................................................... 23

Removing the power connector port..................................................................................................................... 23

Installing the power connector port........................................................................................................................24

Palm rest............................................................................................................................................................................. 24

Removing the palmrest.............................................................................................................................................. 24

Installing the palmrest................................................................................................................................................ 25

Speaker................................................................................................................................................................................ 26

Removing the speakers ........................................................................................................................................ 26

Installing the speakers................................................................................................................................................ 27

Input-Output board...........................................................................................................................................................27

Removing the left Input-Output -IO board .......................................................................................................... 27

Installing the left IO board ........................................................................................................................................28

Removing the right Input-Output - IO board ...................................................................................................... 28

Installing the right IO board ..................................................................................................................................... 29

Heat sink ............................................................................................................................................................................ 29

Removing the heat sink assembly........................................................................................................................... 29

Installing the heat sink assembly............................................................................................................................. 30

Graphics card..................................................................................................................................................................... 30

Removing the graphic card....................................................................................................................................... 30

Installing the graphic card..........................................................................................................................................31

System board...................................................................................................................................................................... 31

Removing the system board......................................................................................................................................31

Installing the system board....................................................................................................................................... 33

Fingerprint reader..............................................................................................................................................................34

Removing the fingerprint reader..............................................................................................................................34

Installing the fingerprint reader................................................................................................................................34

Touchpad.............................................................................................................................................................................35

Removing the touchpad ........................................................................................................................................... 35

Installing the touchpad............................................................................................................................................... 36

Display assembly................................................................................................................................................................36

Removing the display assembly............................................................................................................................... 36

Installing the display assembly..................................................................................................................................38

Power switch board..........................................................................................................................................................38

Removing the power switch board......................................................................................................................... 38

Installing the power switch board........................................................................................................................... 39

ExpressCard Reader......................................................................................................................................................... 39

Removing the expresscard........................................................................................................................................39

Installing the expresscard..........................................................................................................................................40

USB board...........................................................................................................................................................................40

Removing the USB board.......................................................................................................................................... 40

Installing the USB board............................................................................................................................................. 41

Display bezel....................................................................................................................................................................... 42

Removing the display bezel.......................................................................................................................................42

Installing the display bezel.........................................................................................................................................42

Contents

Display panel....................................................................................................................................................................... 43

Removing the display panel.......................................................................................................................................43

Installing the display panel.........................................................................................................................................44

Removing the display panel.......................................................................................................................................44

Installing the display panel.........................................................................................................................................46

Display bracket...................................................................................................................................................................46

Removing the display bracket.................................................................................................................................. 46

Installing the display bracket.....................................................................................................................................47

Display hinges..................................................................................................................................................................... 48

Removing the display hinge...................................................................................................................................... 48

Installing the display hinge.........................................................................................................................................48

eDP cable............................................................................................................................................................................ 49

Removing the eDP cable........................................................................................................................................... 49

Installing the eDP cable............................................................................................................................................. 50

Camera.................................................................................................................................................................................50

Removing the camera................................................................................................................................................ 50

Installing the camera................................................................................................................................................... 51

Display cover...................................................................................................................................................................... 52

Replacing the display cover...................................................................................................................................... 52

Chapter 3: Technology and components...................................................................................... 53

Power adapter................................................................................................................................................................... 53

Processors.......................................................................................................................................................................... 53

Kaby Lake — 7th Generation Intel Core processors.......................................................................................... 53

USB features...................................................................................................................................................................... 54

HDMI 1.4.............................................................................................................................................................................. 55

Chapter 4: System specifications................................................................................................ 57

System information...........................................................................................................................................................57

Processor............................................................................................................................................................................ 57

Memory................................................................................................................................................................................58

Video.................................................................................................................................................................................... 58

Audio.....................................................................................................................................................................................58

Communication.................................................................................................................................................................. 58

Expansion bus.................................................................................................................................................................... 59

Ports and connectors.......................................................................................................................................................59

Display..................................................................................................................................................................................59

Keyboard............................................................................................................................................................................. 60

Touchpad............................................................................................................................................................................ 60

Camera (Optional)............................................................................................................................................................ 60

Storage................................................................................................................................................................................. 61

Battery..................................................................................................................................................................................61

AC adpter.............................................................................................................................................................................61

Contactless smart card....................................................................................................................................................62

Physical dimension............................................................................................................................................................ 62

Environmental.................................................................................................................................................................... 63

Chapter 5: System setup............................................................................................................. 64

Boot menu...........................................................................................................................................................................64

Contents

Navigation keys..................................................................................................................................................................64

System setup options.......................................................................................................................................................65

General screen options.............................................................................................................................................. 65

System Configuration screen options.................................................................................................................... 65

Video screen options.................................................................................................................................................. 67

Security screen options............................................................................................................................................. 68

Secure Boot screen options..................................................................................................................................... 69

Intel Software Guard Extensions screen options.................................................................................................70

Performance screen options.....................................................................................................................................70

Power Management screen options....................................................................................................................... 70

POST Behavior screen options................................................................................................................................. 71

Manageability screen options................................................................................................................................... 72

Virtualization support screen options..................................................................................................................... 72

Wireless screen options............................................................................................................................................. 73

Maintenance screen options..................................................................................................................................... 73

System Log screen options....................................................................................................................................... 74

Updating the BIOS in Windows .....................................................................................................................................74

System and setup password...........................................................................................................................................74

Assigning a system setup password....................................................................................................................... 75

Deleting or changing an existing system setup password................................................................................. 75

Chapter 6: Troubleshooting......................................................................................................... 76

Enhanced Pre-Boot System Assessment — ePSA diagnostics.............................................................................76

Running the ePSA Diagnostics.................................................................................................................................76

Diagnostic LED................................................................................................................................................................... 77

Battery status lights..........................................................................................................................................................77

Real Time Clock reset.......................................................................................................................................................78

Testing memory using ePSA........................................................................................................................................... 78

Chapter 7: Contacting Dell.......................................................................................................... 79

Contents

Working on your computer

Topics:

• Safety instructions

Turning off your — Windows

•

• Before working inside your computer

• After working inside your computer

Safety instructions

Use the following safety guidelines to protect your computer from potential damage and to ensure your personal safety. Unless otherwise noted, each procedure included in this document assumes that the following conditions exist:

● You have read the safety information that shipped with your computer.

● A component can be replaced or, if purchased separately, installed by performing the removal procedure in the reverse

order.

NOTE:

Disconnect all power sources before opening the computer cover or panels. After you finish working inside the

computer, replace all covers, panels, and screws before connecting to the power source.

NOTE: Before working inside your computer, read the safety information that shipped with your computer. For additional

safety best practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance

CAUTION: Many repairs may only be done by a certified service technician. You should only perform

troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or

telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by

your warranty. Read and follow the safety instructions that came with the product.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by periodically

touching an unpainted metal surface that is grounded to ground yourself before you touch the computer to

perform any disassembly tasks.

CAUTION: Handle components and cards with care. Do not touch the components or contacts on a card. Hold a

card by its edges or by its metal mounting bracket. Hold a component such as a processor by its edges, not by

its pins.

CAUTION: When you disconnect a cable, pull on its connector or on its pull-tab, not on the cable itself. Some

cables have connectors with locking tabs; if you are disconnecting this type of cable, press in on the locking

tabs before you disconnect the cable. As you pull connectors apart, keep them evenly aligned to avoid bending

any connector pins. Also, before you connect a cable, ensure that both connectors are correctly oriented and

aligned.

NOTE: The color of your computer and certain components may appear differently than shown in this document.

Turning off your — Windows

CAUTION:

computer .

1. Click or tap .

To avoid losing data, save and close all open files and exit all open programs before you turn off your

Working on your computer 7

2. Click or tap and then click or tap Shut down.

NOTE: Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not

automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds

to turn them off.

Before working inside your computer

1. Ensure that your work surface is flat and clean to prevent the computer cover from being scratched.

2. Turn off your computer.

3. If the computer is connected to a docking device (docked), undock it.

4. Disconnect all network cables from the computer (if available).

CAUTION: If your computer has an RJ45 port, disconnect the network cable by first unplugging the cable

from your computer.

5. Disconnect your computer and all attached devices from their electrical outlets.

6. Open the display.

7. Press and hold the power button for few seconds, to ground the system board.

CAUTION: To guard against electrical shock unplug your computer from the electrical outlet before

performing Step # 8.

CAUTION: To avoid electrostatic discharge, ground yourself by using a wrist grounding strap or by

periodically touching an unpainted metal surface at the same time as touching a connector on the back

of the computer.

8. Remove any installed ExpressCards or Smart Cards from the appropriate slots.

After working inside your computer

After you complete any replacement procedure, ensure that you connect external devices, cards, and cables before turning on your computer.

CAUTION:

not use batteries designed for other Dell computers.

1. Connect any external devices, such as a port replicator or media base, and replace any cards, such as an ExpressCard.

2. Connect any telephone or network cables to your computer.

CAUTION:

computer.

3. Connect your computer and all attached devices to their electrical outlets.

4. Turn on your computer.

To avoid damage to the computer, use only the battery designed for this particular Dell computer. Do

To connect a network cable, first plug the cable into the network device and then plug it into the

Working on your computer

Topics:

• Recommended tools

SD card

•

• Battery cover

• Battery

• Hard drive

• Hard drive cable connector

• Keyboard lattice and Keyboard

• Base cover

• SIM card

• Memory modules

• WWAN card

• WLAN card

• Solid State Drive

• Coin-cell battery

• Power connector port

• Palm rest

• Speaker

• Input-Output board

• Heat sink

• Graphics card

• System board

• Fingerprint reader

• Touchpad

• Display assembly

• Power switch board

• ExpressCard Reader

• USB board

• Display bezel

• Display panel

• Display bracket

• Display hinges

• eDP cable

• Camera

• Display cover

Disassembly and reassembly

Recommended tools

The procedures in this document may require the following tools:

● Phillips #0 screwdriver

● Phillips #1 screwdriver

● Plastic scribe-Recommended for field technician

Disassembly and reassembly 9

SD card

Removing SD card

1. Follow the procedure in Before working inside your computer.

2. Press in on the SD card to release it from the computer.

3. Remove the SD card from the computer.

Installing SD card

1. Slide the SD card into its slot until it clicks into place.

2. Follow the procedure in After working inside your computer.

Battery cover

Removing the battery cover

1. Follow the procedure in Before working inside your computer.

2. To remove the battery cover:

a. Slide the release latch towards the unlock icon to release the battery cover [1]. b. Slide and lift the battery cover to remove it from the computer [2].

Installing the battery cover

1. Slide the battery cover into its slot until it clicks into place.

2. Follow the procedure in After working inside your computer.

Disassembly and reassembly

Battery

Lithium-ion battery precautions

CAUTION:

● Exercise caution when handling Lithium-ion batteries.

● Discharge the battery completely before removing it. Disconnect the AC power adapter from the system and

operate the computer solely on battery power—the battery is fully discharged when the computer no longer

turns on when the power button is pressed.

● Do not crush, drop, mutilate, or penetrate the battery with foreign objects.

● Do not expose the battery to high temperatures, or disassemble battery packs and cells.

● Do not apply pressure to the surface of the battery.

● Do not bend the battery.

● Do not use tools of any kind to pry on or against the battery.

● Ensure any screws during the servicing of this product are not lost or misplaced, to prevent accidental

puncture or damage to the battery and other system components.

● If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing,

bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical

support for assistance. See www.dell.com/contactdell.

● Always purchase genuine batteries from www.dell.com or authorized Dell partners and resellers.

Removing the battery

1. Follow the procedure in Before working inside your computer.

2. Remove the battery cover.

3. To remove battery:

a. Slide the release latch towards from the unlock icon to unlock the battery[1]. b. Lift and remove the battery from the computer [2].

Installing the battery

1. Slide the battery into its slot until it clicks into place.

Disassembly and reassembly

2. Install the battery cover.

3. Follow the procedure in After working inside your computer

Hard drive

Removing the hard drive

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery

3. To remove hard drive:

a. Remove the M3.0x3.0 screws that secure the hard drive to the computer [1]. b. Lift the hard drive latch to release the hard drive [2]. c. Slide and lift the hard drive from the computer [3].

4. Remove the M3.0x3.0 screws that secure the hard drive. Lift the hard drive from the bracket.

Disassembly and reassembly

Installing the hard drive

1. Replace the M3.0x3.0 screws to secure the hard drive to the hard drive bracket.

2. Insert the hard drive into its slot in the computer.

3. Replace the M3.0x3.0 screws to secure the hard drive to the computer.

4. Install the:

a. battery b. battery cover

5. Follow the procedure in After working inside your computer.

Hard drive cable connector

Removing the hard drive cable connector

1. Follow the procedures in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover d. hard drive

3. To remove the hard drive cable connector:

a. Remove the M2.5x5.0 screws that secure the hard drive connector to the system board [1]. b. Remove the hard drive cable connector from the computer [2].

Installing the hard drive cable connector

1. Connect the hard drive cable to the system board.

Disassembly and reassembly

2. Insert and route the cable through the routing channel.

3. Replace the M2.5x5.0 screws to secure the hard drive cable connector to the computer.

4. Install the:

a. hard drive b. base cover c. battery d. battery cover

5. Follow the procedure in After working inside your computer.

Keyboard lattice and Keyboard

Removing the keyboard

1. Follow the procedures in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. hard drive

3. To remove keyboard cable:

a. Peel the tape to access the keyboard cable [1]. b. Disconnect the keyboard cables from the touchpad board [2]

4. To remove the keyboard:

a. Using plastic scribe pry the keyboard trim from the bottom and work along the top edge and remove it from the

computer [1, 2, 3]. b. Remove the M2.0x2.5 screws that secure the keyboard to the computer [4]. c. Lift and slide the keyboard to remove it away from the computer [5].

Disassembly and reassembly

Installing the keyboard

1. Align the keyboard and route the cables back through to the bottom of the compartment.

2. Press and align the keyboard to its compartment.

3. Replace the screws to secure the keyboard to the computer.

4. Slide the keyboard trim and align it to its position on the computer. Ensure that the keyboard trim clicks into its place

5. Connect the keyboard data cables to the touchpad board.

NOTE: Ensure that you fold the keyboard data cable in perfect alignment.

6. Affix the tape on the keyboard data cables.

7. Install the:

a. hard drive b. battery c. battery cover

8. Follow the procedure in After working inside your computer.

Base cover

Removing the base cover

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery

3. To remove base cover:

a. Remove the M2.5X5.0 screws that secure the base cover to the computer [1]. b. Slide and lift the base cover away from the computer [2].

Disassembly and reassembly

Installing the base cover

1. Slide the base cover to align with the screw holes on the computer.

2. Replace the M2.5X5.0 screws to secure the base cover to the computer.

3. Install the:

a. battery b. battery cover

4. Follow the procedure in After working inside your computer.

SIM card

Removing the SIM card

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove the SIM card press in on the card to release.

NOTE: During installation or removal of the SIM card, always ensure all data is backed up properly.

16 Disassembly and reassembly

Installing the SIM card

1. Slide in the SIM Card into its compartment and press until its fully engaged with a click sound.

NOTE: During installation or removal of the SIM card, always ensure all data is backed up properly.

2. Install the:

a. base cover b. battery c. battery cover

3. Follow the procedure in After working inside your computer.

Memory modules

Removing the primary memory module

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove primary memory module:

a. Pry the retention clips away from the memory module until it pops up.

Disassembly and reassembly

b. Lift the memory module and remove it from the computer.

Installing the primary memory module

1. Insert the memory module into the memory socket.

NOTE: Installing one or three memory modules leads to system performance issues.

2. Press the clips to secure the memory module to the system board.

3. Install the:

a. base cover b. battery c. battery cover

4. Follow the procedure in After working inside your computer.

Removing the secondary memory module

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. hard drive d. keyboard

3. To remove the secondary memory module:

a. Remove the screw that secures the memory shield [1]. b. Lift and remove the memory shield from the computer [2]. c. Pry the retention clips away from the memory module until it pops up [3]. d. Lift the memory module and remove it from the computer [4].

Disassembly and reassembly

Installing the secondary memory module

1. Insert the memory module into the memory socket.

2. Press the clips to secure the memory module to the system board.

3. Place the memory shield in its original position on the memory module and tighten the screw to secure it to the computer.

4. Install the:

a. keyboard b. hard drive c. battery d. battery cover

5. Follow the procedure in After working inside your computer.

WWAN card

Removing Wireless Wide Area Network - WWAN card

NOTE: Depending on the configuration you choose, you may or may not have WWAN card.

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove the WWAN card:

a. Disconnect and unroute the antenna cables connected to the WWAN card [1]. b. Remove the M2.0x3.0 screw that secures the WWAN card to the computer [2]. c. Remove the WWAN card from the computer [3].

Disassembly and reassembly

Installing the WWAN card

NOTE: Depending on the configuration you choose, you may or may not have WWAN card.

1. Slide the WWAN card to the WWAN card slot.

2. Replace the M2.0x3.0 screw to secure the WWAN card to the computer.

3. Route the antenna cables through the routing channels and connect them to the WWAN card.

4. Install the:

a. base cover b. battery c. battery cover

5. Follow the procedure in After working inside your computer.

WLAN card

Removing the Wireless Local Area Network - WLAN card

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove the WLAN card from the computer:

a. Remove the M2.0x3.0 screw that secures the WLAN card to the computer [1]. b. Remove the shield that secures the antenna cables [2]. c. Disconnect and un-route the antenna cables connected to the WLAN card and remove the WLAN card from the

computer [3,4].

Disassembly and reassembly

Installing the WLAN Card

1. Insert the WLAN card in its slot on the computer.

2. Route the antenna cables through the routing channel and connect them to the WLAN card.

3. Align the shield and tighten the M2.0x3.0 screw to secure the WLAN card to the computer.

4. Install the:

a. base cover b. battery c. battery cover

5. Follow the procedures in After working inside your computer.

Solid State Drive

Removing the M.2 Solid State Drive -SSD module

1. Follow the procedures in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove the SSD module:

a. Remove the M2.0x3.0 screw that secures the thermal plate to the computer. b. Remove the thermal plate from the computer. c. Remove the M2.0x3.0 screw that secures the SSD to the computer. d. Remove the SSD away from the computer.

Disassembly and reassembly

Installing the M.2 SSD module

1. Place the SSD in its slot.

2. Replace the M2.0x3.0 screw to secure the SSD to the computer.

3. Place the thermal plate on the SSD.

4. Replace the M2.0x3.0 screw to secure the thermal plate to the computer.

5. Install the:

a. base cover b. battery c. battery cover

6. Follow the procedure in After working inside your computer.

Coin-cell battery

Removing the coin cell battery

1. Follow the procedures in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove coin cell battery:

a. Disconnect the coin cell battery cable from the computer [1]. b. Pry and lift the coin cell battery from the computer [2].

Disassembly and reassembly

Installing the coin cell battery

1. Replace the coin cell battery in its slot on the computer.

2. Connect the coin cell battery cable to the comupter.

NOTE: Ensure that the coin cell battery cable does not protrude outside its compartment.

3. Install the:

a. base cover b. battery c. battery cover

4. Follow the procedure in After working inside your computer.

Power connector port

Removing the power connector port

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover

3. To remove power connector port:

a. Disconnect the power connector cable from the computer [1]. b. Remove the M2.5x5.0 screw to remove the bracket from the computer . c. Lift the power connector port from the computer [2].

Disassembly and reassembly

Installing the power connector port

1. Replace the power connector cable on the computer.

2. Route the cable through the routing channel

3. Replace the M2.5x5.0 screw to secure the power connector port to the computer.

4. Connect the power connector cable.

5. Install the:

a. base cover b. battery c. battery cover

6. Follow the procedure in After working inside your computer.

Palm rest

Removing the palmrest

1. Follow the procedure in Before working inside your computer.

2. Remove the:

a. battery cover b. battery c. base cover d. hard drive e. keyboard

3. Remove the 15 screws (M2.5x5.0, M2.0x8.0, M2.0x3.0) at the bottom of the computer which secure the palmrest to the computer .

Disassembly and reassembly

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