Dell Latitude 7490 Service Manual Download Page 70

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Microphones

Removing the microphones

Prerequisites

1. Follow the procedure in

Before working inside your computer

2. Remove the

stand

3. Remove the

cable cover

(optional).

4. Remove the

back cover

5. Remove the

system-board shield

6. Remove the

bottom cover

7. Remove the

rear-I/O bracket

8. Remove the

speakers

About this task

The following image indicates the location of the microphones and provides a visual representation of the removal procedure.

Steps

1. Disconnect the microphone cable from the system board, and unroute it from the routing guides on the display-assembly

base.

2. Remove the two screws (M2x2.5) that secure the microphone modules to the middle frame.
3. Lift the microphone modules off the slots on the middle frame.

Removing and installing components

Summary of Contents for Latitude 7490

Page 1: ...OptiPlex 7490 All In One Service Manual Regulatory Model W26C Regulatory Type W26C003 W26C004 April 2021 Rev A00 ...

Page 2: ...ential 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 2021 Dell Inc or its subsidiaries All rights reserved Dell EMC and other trademarks are trademarks of Dell Inc or its subsidiaries Other trademarks may be trademarks of their respective owners ...

Page 3: ...over optional 19 Removing the cable cover 19 Installing the cable cover 21 Back cover 22 Removing the back cover 22 Installing the back cover 24 Hard drive 25 Removing the hard drive 25 Installing the hard drive 26 Memory modules 27 Removing the memory modules 27 Installing the memory modules 28 System board shield 29 Removing the system board shield 29 Installing the system board shield 30 Solid ...

Page 4: ...sink discrete 55 Processor 56 Removing the processor 56 Installing the processor 57 Rear I O bracket 59 Removing the rear I O bracket 59 Installing the rear I O bracket 60 System board 61 Removing the system board 61 Installing the system board 63 Speakers 65 Removing the speakers 65 Installing the speakers 66 Power button board 68 Removing the power button board 68 Installing the power button boa...

Page 5: ...ting the Dell BIOS in Linux and Ubuntu environments 100 System and setup password 100 Assigning a system setup password 100 Deleting or changing an existing system setup password 101 Clearing CMOS settings 101 Clearing BIOS System Setup and System passwords 101 Chapter 5 Troubleshooting 102 Display built in self test 102 SupportAssist diagnostics 102 Running the SupportAssist Pre Boot System Perfo...

Page 6: ...at is not authorized by Dell is not covered by your warranty See the safety instructions that shipped with the product or at www dell com regulatory_compliance CAUTION Before touching anything inside your computer ground yourself by using a wrist grounding strap or by periodically touching an unpainted metal surface such as the metal at the back of the computer While you work periodically touch an...

Page 7: ...tracing is merely weakened and does not immediately produce outward symptoms related to the damage The weakened trace may take weeks or months to melt and in the meantime may cause degradation of memory integrity intermittent memory errors etc The more difficult type of damage to recognize and troubleshoot is the intermittent also called latent or walking wounded failure Perform the following step...

Page 8: ...re physically handling any hardware components ESD Packaging All ESD sensitive devices must be shipped and received in static safe packaging Metal static shielded bags are preferred However you should always return the damaged part using the same ESD bag and packaging that the new part arrived in The ESD bag should be folded over and taped shut and all the same foam packing material should be used...

Page 9: ...re that no stray screws remain inside your computer 2 Connect any external devices peripherals or cables you removed before working on your computer 3 Replace any media cards discs or any other parts that you removed before working on your computer 4 Connect your computer and all attached devices to their electrical outlets 5 Turn on your computer Working inside your computer 9 ...

Page 10: ... the correct number of screws and correct screw type is restored when the component is replaced NOTE Some systems have magnetic surfaces Ensure that the screws are not left attached to such surface when replacing a component NOTE Screw color may vary with the configuration ordered Table 1 OptiPlex 7490 All in One screw list Component Screw type Quantity Screw image Cable cover optional M3x9 1 Syst...

Page 11: ...eat sink Discrete Captive screws 9 Power supply unit PSU M3x5 2 PSU fan M3x5 2 Rear I O bracket M3x5 4 System board M3x5 9 Speakers M3 4 7 1xZN 9 Power button board M3x5 1 Microphones M2x2 5 4 Side I O board shield M3x5 2 Side I O board M2 5x3 5 2 Antenna modules M2x2 5 2 Display panel M3x5 12 Middle frame M3x5 16 Audio board M3x5 1 Removing and installing components 11 ...

Page 12: ...2230 2280 solid state drive 8 Rear I O bracket 9 Side I O board 10 Speakers 11 Audio board 12 Display panel 13 Display assembly base 14 Middle frame 15 Camera assembly door 16 Power supply unit PSU 17 System board 18 System board shield 19 Camera assembly 20 Wireless card 21 PSU fan 12 Removing and installing components ...

Page 13: ...s recommends removing the stand to avoid accidental damage to the system display during servicing About this task The following image provides a visual representation of the fixed stand removal procedure Steps 1 Press and slide the release button up 2 Hold the button in the release position and lift the stand upward 3 Slide the stand downward to lift the stand off the back cover Removing and insta...

Page 14: ... on the mounting bracket on the stand into the slots on the monitor until you hear a click Next steps 1 Follow the procedure in After working inside your computer Removing the articulating stand Prerequisites 1 Follow the procedure in Before working inside your computer CAUTION When servicing the system place it on an elevated clean and flat surface It is recommended to remove the stand to avoid a...

Page 15: ...About this task The following image provides a visual representation of the articulating stand removal procedure Removing and installing components 15 ...

Page 16: ...ver 4 Pry the rubber feet from the bottom cover and pull it out Installing the articulating stand Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image provides a visual representation of the articulating stand installation procedure 16 Removing and installing components ...

Page 17: ...d Prerequisites NOTE Follow the same procedure to remove the Height Adjustable Stand with Optical Disk Drive 1 Follow the procedure in Before working inside your computer CAUTION When servicing the system place it on an elevated clean and flat surface Dell recommends removing the stand to avoid accidental damage to the system display during servicing About this task The following image provides a ...

Page 18: ...ght adjustable stand Prerequisites If you are replacing a component remove the existing component before performing the installation procedure NOTE Follow the same procedure to install the Height Adjustable Stand with Optical Disk Drive About this task The following image provides a visual representation of the height adjustable stand installation procedure 18 Removing and installing components ...

Page 19: ...le cover Prerequisites 1 Follow the procedure in Before working inside your computer CAUTION When servicing the system place it on an elevated clean and flat surface It is recommended to remove the stand to avoid accidental damage to the system display during servicing 2 Remove the stand About this task The following image provides a visual representation of the cable cover removal procedure Remov...

Page 20: ...route the power cable from the slots on the cable cover 2 Remove the screw M3x9 that secures the cable cover to the bottom cover 3 Lift the cable cover from the bottom cover 20 Removing and installing components ...

Page 21: ...are replacing a component remove the existing component before performing the installation procedure About this task The following image provides a visual representation of the cable cover installation procedure Removing and installing components 21 ...

Page 22: ...r computer Back cover Removing the back cover Prerequisites 1 Follow the procedure in Before working inside your computer CAUTION When servicing the system place it on an elevated clean and flat surface It is recommended to remove the stand to avoid accidental damage to the system display during servicing 2 Remove the stand 3 Remove the cable cover optional About this task The following image prov...

Page 23: ...ack cover to release it from the latch on the system board shield 2 Slide the back cover up to release the tabs on the cover from the slots on the middle frame 3 Lift the back cover and remove it from the system Removing and installing components 23 ...

Page 24: ...are replacing a component remove the existing component before performing the installation procedure About this task The following image provides a visual representation of the back cover installation procedure 24 Removing and installing components ...

Page 25: ...ble cover optional 2 Install the stand 3 Follow the procedure in After working inside your computer Hard drive Removing the hard drive Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover About this task The following image indicates the location of the hard drive and provides a visual representatio...

Page 26: ...om its slots on the hard drive 4 Remove the hard drive from the hard drive bracket Installing the hard drive Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the hard drive and provides a visual representation of the installation procedure 26 Removing and installin...

Page 27: ...xt steps 1 Install the back cover 2 Install the cable cover optional 3 Install the stand 4 Follow the procedure in After working inside your computer Memory modules Removing the memory modules Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover About this task The following image indicates the loca...

Page 28: ...rom the memory module slot NOTE Repeat step 2 and 3 if there are two memory modules Installing the memory modules Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the memory module and provides a visual representation of the installation procedure 28 Removing and i...

Page 29: ... the system board shield and snap into place Next steps 1 Install the back cover 2 Install the cable cover optional 3 Install the stand 4 Follow the procedure in After working inside your computer System board shield Removing the system board shield Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cov...

Page 30: ...ly base Installing the system board shield Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the system board shield and provides a visual representation of the installation procedure 30 Removing and installing components ...

Page 31: ...stall the back cover 2 Install the cable cover optional 3 Install the stand 4 Follow the procedure in After working inside your computer Solid state drive Removing the M 2 2230 solid state drive Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield Removing and instal...

Page 32: ... the M 2 card slot on the system board Installing the M 2 2230 solid state drive Prerequisites CAUTION Solid state drives are fragile Exercise care when handling the solid state drive If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the M 2 2230 solid state drive and provides a ...

Page 33: ...all the stand 5 Follow the procedure in After working inside your computer Removing the M 2 2280 solid state drive Intel Optane memory module Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield About this task The following image indicates the location of the M 2 22...

Page 34: ...le Prerequisites CAUTION Solid state drives are fragile Exercise care when handling the solid state drive If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the M 2 2280 solid state drive Intel Optane memory module and provides a visual representation of the installation procedure...

Page 35: ...nstall the cable cover optional 4 Install the stand 5 Follow the procedure in After working inside your computer System fan Removing the system fan Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield About this task The following image indicates the location of the ...

Page 36: ...g with its cable off the display assembly base Installing the system fan Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the system fan and provides a visual representation of the installation procedure 36 Removing and installing components ...

Page 37: ...computer Coin cell battery Removing the coin cell battery Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield NOTE Removing the coin cell battery resets the CMOS and BIOS settings to default and results in data lose It is recommended that you note the CMOS and BIOS ...

Page 38: ...in cell battery holder Installing the coin cell battery Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the coin cell battery and provides a visual representation of the installation procedure 38 Removing and installing components ...

Page 39: ...ll the stand 5 Follow the procedure in After working inside your computer Wireless card Removing the wireless card Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield About this task The following image indicates the location of the wireless card and provides a visu...

Page 40: ...off the wireless card 6 Disconnect the antenna cables from the wireless card 7 Slide and remove the wireless card from the wireless card slot Installing the wireless card Prerequisites If you are replacing a component remove the existing component before performing the installation procedure CAUTION To avoid damage to the wireless card route the antenna cables accurately About this task The follow...

Page 41: ...reless card slot 4 Slide the wireless card at an angle into the wireless card slot 5 Replace the screw M2x2 5 to secure the wireless card and wireless card bracket to the display assembly base 6 Align and place the wireless card shield on the system board and wireless card 7 Replace the two screws M2x2 5 to secure the wireless card shield to the system board 8 Route the antenna cables through the ...

Page 42: ...cedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield About this task The following image indicates the location of the camera assembly and provides a visual representation of the removal procedure 42 Removing and installing components ...

Page 43: ...ame 5 Unroute the camera cable from the routing guides on the display assembly base Installing the camera assembly Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the camera assembly and provides a visual representation of the installation procedure Steps 1 Route ...

Page 44: ...o the display assembly base Next steps 1 Install the system board shield 2 Install the back cover 3 Install the cable cover optional 4 Install the stand 5 Follow the procedure in After working inside your computer Bottom cover Removing the bottom cover Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back ...

Page 45: ...sembly base Installing the bottom cover Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the bottom cover and provides a visual representation of the installation procedure Removing and installing components 45 ...

Page 46: ... stand 5 Follow the procedure in After working inside your computer Power supply unit Removing the power supply unit PSU Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield 6 Remove the bottom cover About this task The following image indicates the location of the P...

Page 47: ...Removing and installing components 47 ...

Page 48: ...rom the connector on the system board 5 Remove the screw M3x5 that secures the PSU to the display assembly base 6 Lift the PSU out of the system Installing the power supply unit PSU Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the PSU and provides a visual repr...

Page 49: ...Removing and installing components 49 ...

Page 50: ...e the power supply socket to the rear I O bracket Next steps 1 Install the bottom cover 2 Install the system board shield 3 Install the back cover 4 Install the cable cover optional 5 Install the stand 6 Follow the procedure in After working inside your computer Power supply fan Removing the PSU fan Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Re...

Page 51: ...splay assembly base 4 Lift the PSU fan from the display assembly base Installing the PSU fan Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the PSU fan and provides a visual representation of the installation procedure Removing and installing components 51 ...

Page 52: ... PSU fan Next steps 1 Install the bottom cover 2 Install the system board shield 3 Install the back cover 4 Install the cable cover optional 5 Install the stand 6 Follow the procedure in After working inside your computer Heat sink Removing the heat sink UMA Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the...

Page 53: ...heat sink off the system board and display assembly base Installing the heat sink UMA Prerequisites If you are replacing a component remove the existing component before performing the installation procedure NOTE If either the system board or the heat sink is replaced use the thermal pad paste provided in the kit to ensure that thermal conductivity is achieved About this task The following image i...

Page 54: ...eps 1 Install the system fan 2 Install the system board shield 3 Install the back cover 4 Install the cable cover optional 5 Install the stand 6 Follow the procedure in After working inside your computer Removing the heat sink discrete Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove th...

Page 55: ...nk off the system board and display assembly base Installing the heat sink discrete Prerequisites If you are replacing a component remove the existing component before performing the installation procedure NOTE If either the system board or the heat sink is replaced use the thermal pad paste provided in the kit to ensure that thermal conductivity is achieved About this task The following image ind...

Page 56: ...se Next steps 1 Install the system fan 2 Install the system board shield 3 Install the back cover 4 Install the cable cover optional 5 Install the stand 6 Follow the procedure in After working inside your computer Processor Removing the processor Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover ...

Page 57: ...essor cover CAUTION When removing the processor do not touch any of the pins inside the socket or allow any objects to fall on the pins in the socket 3 Gently lift the processor from the processor socket Installing the processor Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the...

Page 58: ...eated properly 2 Align the notches on the processor with the tabs on the processor socket and place the processor in the processor socket CAUTION Ensure that the processor cover notch is positioned underneath the alignment post 3 When the processor is fully seated in the socket pivot the release lever down and place it under the tab on the processor cover Next steps 1 Install the heat sink 2 Insta...

Page 59: ... of the rear I O bracket and provides a visual representation of the removal procedure Steps 1 Remove the screw M3x5 that secures the power supply socket to the rear I O bracket 2 Remove the power supply cable from the routing guide on the rear I O bracket 3 Slide and remove the power supply socket away from the rear I O bracket 4 Remove the three screws M3x5 that secure the rear I O bracket to th...

Page 60: ...screws M3x5 to secure the rear I O bracket to the display assembly base 3 Route the power supply cables through the routing guide on the rear I O bracket 4 Align the screw hole on the power supply socket with the screw hole on the rear I O bracket and place it in the slot on the rear I O bracket 5 Replace the screw M3x5 to secure the power supply socket to the rear I O bracket Next steps 1 Install...

Page 61: ...riate changes again after you replace the system board 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the hard drive 6 Remove the system board shield 7 Remove the memory modules 8 Remove the wireless card 9 Remove the M 2 2230 solid state drive 10 Remove the M 2 2280 solid state drive Intel Optane memory 11 Remove the heat sink 12 Remove the processor 13 Remo...

Page 62: ...or 13 Microphone module cable connector 14 Speaker cable connector 15 Power button cable connector 16 Display cable connector 17 M 2 WLAN connector 18 PSU fan cable connector 19 Touchscreen cable connector 20 Processor The following image indicates the location of the system board and provides a visual representation of the removal procedure Steps 1 Disconnect the display back light cable from the...

Page 63: ...board 12 Disconnect the touchscreen cable from the connector on the system board 13 Disconnect the camera cable from the connector on the system board 14 Remove the nine screws M3x5 that secure the system board to the display assembly base 15 Lift and remove the system board from the display assembly base Installing the system board Prerequisites If you are replacing a component remove the existin...

Page 64: ...es a visual representation of the installation procedure Steps 1 Align the screw holes on the system board with the screw holes on the display assembly base 2 Replace the nine screws M3x5 to secure the system board to the display assembly base 3 Connect the camera cable to the connector system board 4 Connect the touchscreen cable to the system board 5 Connect the system fan cable to the system bo...

Page 65: ... drive 8 Install the wireless card 9 Install the memory modules 10 Install the system board shield 11 Install the hard drive 12 Install the back cover 13 Install the cable cover optional 14 Install the stand 15 Follow the procedure in After working inside your computer NOTE Your computer s Service Tag is stored in the system board You must enter the Service Tag in the BIOS setup program after you ...

Page 66: ...the display assembly base 4 Lift the speakers along with the cable off the display assembly base Installing the speakers Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the speakers and provides a visual representation of the installation procedure 66 Removing and...

Page 67: ... speaker cable through the routing guide on display assembly base and connect the speaker cable to the system board Next steps 1 Install the rear I O bracket 2 Install the bottom cover 3 Install the system board shield 4 Install the back cover 5 Install the cable cover optional 6 Install the stand 7 Follow the procedure in After working inside your computer Removing and installing components 67 ...

Page 68: ... I O bracket 8 Remove the speakers About this task The following image indicates the location of the power button board and provides a visual representation of the power button board removal procedure Steps 1 Open the latch and disconnect the power button board cable from the connector on the system board 2 Remove the screw M3x5 that secures the power button board to the middle frame 3 Lift the po...

Page 69: ...the power button board in the slot on the middle frame 2 Replace the screw M3x5 to secure the power button board to the middle frame 3 Slide the power button board cable into the connector on the system board and close the latch to secure the cable Next steps 1 Install the speakers 2 Install the rear I O bracket 3 Install the bottom cover 4 Install the system board shield 5 Install the back cover ...

Page 70: ... 8 Remove the speakers About this task The following image indicates the location of the microphones and provides a visual representation of the removal procedure Steps 1 Disconnect the microphone cable from the system board and unroute it from the routing guides on the display assembly base 2 Remove the two screws M2x2 5 that secure the microphone modules to the middle frame 3 Lift the microphone...

Page 71: ... screw holes on the middle frame 2 Replace the two screws M2X2 5 to secure the microphone modules to the middle frame 3 Route the microphone cable through the routing guides on the display assembly base and connect the microphone cable to the system board Next steps 1 Install the speakers 2 Install the rear I O bracket 3 Install the bottom cover 4 Install the system board shield 5 Install the back...

Page 72: ...ve the cable cover optional 4 Remove the back cover 5 Remove the hard drive 6 Remove the system board shield 7 Remove the bottom cover 8 Remove the rear I O bracket About this task The following image indicates the location of the side I O board and provides a visual representation of the removal procedure 72 Removing and installing components ...

Page 73: ...g guides on the display assembly base 5 Remove the two screws M2 5x3 5 that secure the side I O board to the display assembly base 6 Lift and remove the side I O board with cables off the display assembly base Installing the side I O board Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image in...

Page 74: ... steps 1 Install the speakers 2 Install the rear I O bracket 3 Install the bottom cover 4 Install the system board shield 5 Install the hard drive 6 Install the back cover 7 Install the cable cover optional 8 Install the stand 9 Follow the procedure in After working inside your computer Audio board Removing the audio board Prerequisites 1 Follow the procedure in Before working inside your computer...

Page 75: ...equisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of the audio board and provides a visual representation of the removal procedure Steps 1 Align the screw hole on the audio board with the screw hole on the display assembly base 2 Replace the screw M3x5 to secure the audio ...

Page 76: ...g inside your computer Antenna modules Removing the antenna modules Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield 6 Remove the wireless card 7 Remove the bottom cover 8 Remove the rear I O bracket 9 Remove the speakers About this task The following image indic...

Page 77: ...lay assembly base 2 Remove the two screws M2x2 5 that secure the antenna modules to the middle frame 3 Carefully peel the copper foil that secures the antenna cables to the middle frame 4 Lift the antenna modules off the middle frame Removing and installing components 77 ...

Page 78: ... remove the existing component before performing the installation procedure About this task The following image indicates the location of the antenna modules and provides a visual representation of the antenna modules installation procedure 78 Removing and installing components ...

Page 79: ... cover 4 Install the wireless card 5 Install the system board shield 6 Install the back cover 7 Install the cable cover optional 8 Install the stand 9 Follow the procedure in After working inside your computer Display panel Removing the display panel Prerequisites 1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back co...

Page 80: ... Remove the PSU 13 Remove the PSU fan About this task The following image indicates the location of the display panel and provides a visual representation of the display panel removal procedure 80 Removing and installing components ...

Page 81: ...assembly base 5 Route the display back light and display cable through the slots on the display assembly base 6 Lift the display panel up from the middle frame and display assembly base Installing the display panel Prerequisites If you are replacing a component remove the existing component before performing the installation procedure About this task The following image indicates the location of t...

Page 82: ...el on the slots of the display assembly base 2 Route the display backlight and display cable through the slots on the display assembly base 3 Place the display assembly base on a clean and flat surface with the display panel facing down 82 Removing and installing components ...

Page 83: ...with three screws M3x5 to secure the display panel to the middle frame and display assembly base NOTE The jig screw is shipped with the replacement display panel It is used to align the display panel to the display assembly base Table 3 Number of jig screws Display type Number of jig screws Touch display One Non touch display Three Removing and installing components 83 ...

Page 84: ...1 Follow the procedure in Before working inside your computer 2 Remove the stand 3 Remove the cable cover optional 4 Remove the back cover 5 Remove the system board shield 6 Remove the hard drive 7 Remove the wireless card 8 Remove the bottom cover 9 Remove the rear I O bracket 10 Remove the speakers 11 Remove the camera assembly 12 Remove the system board 13 Remove the power button board 14 Remov...

Page 85: ... 1 Remove the 17 screws M3x5 that secure the middle frame to the display assembly base 2 Remove the middle frame and lift the middle frame off the display assembly base Removing and installing components 85 ...

Page 86: ...nt remove the existing component before performing the installation procedure About this task The following image indicates the location of the middle frame and provides a visual representation of the middle frame installation procedure 86 Removing and installing components ...

Page 87: ... I O board 4 Install the PSU fan 5 Install the PSU 6 Install the microphones 7 Install the power button board 8 Install the system board 9 Install the camera assembly 10 Install the speakers 11 Install the rear I O bracket 12 Install the bottom cover 13 Install the wireless card 14 Install the hard drive 15 Install the system board shield 16 Install the back cover 17 Install the cable cover option...

Page 88: ...rivers and downloads When troubleshooting downloading or installing drivers it is recommended that you read the Dell Knowledge Based article Drivers and Downloads FAQ SLN128938 3 88 Drivers and downloads ...

Page 89: ... attached devices such as hard disk video adapter keyboard mouse and printer Entering BIOS setup program About this task Turn on or restart your computer and press F2 immediately Boot Sequence Boot Sequence allows you to bypass the System Setup defined boot device order and boot directly to a specific device for example optical drive or hard drive During the Power on Self Test POST when the Dell l...

Page 90: ...hip Tag Displays the Ownership Tag of the computer Signed Firmware Update Displays whether the Signed Firmware Update is enabled on your computer Processor Information Processor Type Displays the processor type Maximum Clock Speed Displays the maximum processor clock speed Minimum Clock Speed Displays the minimum processor clock speed Current Clock Speed Displays the current processor clock speed ...

Page 91: ...M 2 PCIe SSD information of the computer Slot 3_M 2 Displays the M 2 PCIe SSD information of the computer Table 5 System setup options Boot Configuration menu Boot Configuration Boot Sequence Boot mode Displays the boot mode Boot Sequence Displays the boot sequence Secure Digital SD Card Boot Enable or disable the SD card read only boot By default the Secure Digital SD Card Boot option is not enab...

Page 92: ...he onboard drives By default SATA HDD M 2 PCIe SSD 0 and M 2 PCIe SSD 1 options are enabled SMART Reporting Enable SMART Reporting Enable or disable Self Monitoring Analysis and Reporting Technology SMART during computer startup By default the Enable SMART Reporting option is not enabled Drive Information SATA HDD Type Displays the SATA HDD type information of the computer Device Displays the SATA...

Page 93: ...ture HTTPs Boot Enable or disable the HTTPs Boot feature By default the HTTPs Boot option is enabled HTTPs Boot Mode With Auto Mode the HTTPs Boot extracts Boot URL from the DHCP With Manual Mode the HTTPs Boot reads Boot URL from the user provided data By default the Auto Mode option is enabled Table 10 System setup options Power menu Power USB PowerShare Enable USB PowerShare Enable or disable t...

Page 94: ...M will use the SHA 256 hash algorithm to extend measurements into the TPM PCRs during BIOS boot By default the SHA 256 option is enabled Clear Enables to clear the TPM owner information and returns the TPM to the default state By default the Clear option is disabled PPI ByPass for Clear Commands Controls the TPM Physical Presence Interface PPI By default the PPI ByPass for clear Commands option is...

Page 95: ...d Changes Enable Non Admin Password Changes Enable or disable to change computer and hard drive password without the need for admin password By default the option is enabled Admin Setup Lockout Enable Admin Setup Lockout Enables administrators control over how their users can or cannot access BIOS setup By default the option is disabled Master Password Lockout Enable Master Password Lockout When e...

Page 96: ...nt Service Tag Display the Service Tag of the computer Asset Tag Create a computer Asset Tag Wake on LAN WLAN Enable or disable the computer to power on by special LAN signals when it receives a wakeup signal from the WLAN By default the Disabled option is selected Auto on Time Enable to set the computer to turn on automatically every day or on a preselected date and time This option can be config...

Page 97: ... VMM can utilize the additional hardware capabilities provided by Intel Virtualization Technology By default the option is enabled VT for Direct I O Specify whether a Virtual Machine Monitor VMM can utilize the additional hardware capabilities provided by Intel Virtualization Technology for Direct I O By default the option is enabled Intel Trusted Execution Technology TXT Enable Intel Trusted Exec...

Page 98: ...cker is enabled it must be suspended before updating the system BIOS and then re enabled after the BIOS update is completed Steps 1 Restart the computer 2 Go to www dell com support Enter the Service Tag or Express Service Code and click Search Click Drivers Downloads Click Detect Drivers and follow the on screen instructions 3 If you are unable to detect or find the Service Tag click Browse all p...

Page 99: ...t load into Windows but there is still a need to update the BIOS download the BIOS file using another computer and save it to a bootable USB flash drive NOTE You must use a bootable USB flash drive For more information see the knowledge base article SLN143196 Steps 1 Download the BIOS update exe file to another computer 2 Copy the exe file onto the bootable USB flash drive 3 Insert the USB flash d...

Page 100: ... password feature is disabled Assigning a system setup password Prerequisites You can assign a new System or Admin Password only when the status is in Not Set About this task To enter the system setup press F12 immediately after a power on or reboot Steps 1 In the System BIOS or System Setup screen select Security and press Enter The Security screen is displayed 2 Select System Admin Password and ...

Page 101: ...the existing setup password and press Enter or Tab NOTE If you change the System and or Setup password reenter the new password when prompted If you delete the System and or Setup password confirm the deletion when prompted 5 Press Esc and a message prompts you to save the changes 6 Press Y to save the changes and exit from System Setup The computer restarts Clearing CMOS settings About this task ...

Page 102: ... about the failed device s View status messages that indicate if the tests are completed successfully View error messages that indicate if problems were encountered during the test NOTE Some tests are meant for specific devices and require user interaction Ensure that you are present in front of the computer when the diagnostic tests are performed For more information see SupportAssist Pre Boot Sy...

Page 103: ...program i Fuse Replace the system board 1 6 EC internal Failure Generic catch all for ungraceful EC code flow errors Disconnect all power source AC battery coin cell and press and hold the power button to drain flea power 2 1 Processor failure Run the Intel CPU diagnostics tools If problem continues replace the system board 2 2 System board BIOS or ROM Read Only Memory failure Flash the latest BIO...

Page 104: ... boots to the operating system It enables you to diagnose hardware issues repair your computer back up your files or restore your computer to its factory state You can also download it from the Dell Support website to troubleshoot and fix your computer when it fails to boot into their primary operating system due to software or hardware failures For more information about the Dell SupportAssist OS...

Page 105: ...o WiFi connectivity issues a WiFi power cycle procedure may be performed The following procedure provides the instructions on how to conduct a WiFi power cycle NOTE Some ISPs Internet Service Providers provide a modem router combo device Steps 1 Turn off your computer 2 Turn off the modem 3 Turn off the wireless router 4 Wait for 30 seconds 5 Turn on the wireless router 6 Turn on the modem 7 Turn ...

Page 106: ...cations technical help blogs drivers software updates and so on www dell com support Dell knowledge base articles for a variety of computer concerns 1 Go to https www dell com support home app knowledgebase 2 Type the subject or keyword in the Search box 3 Click Search to retrieve the related articles Contacting Dell To contact Dell for sales technical support or customer service issues see www de...

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Dell Latitude 7490, Service Manual

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