Top......................................7 Front....................................... 8 Bottom....................................9 Service Tag................................... 9 Battery charge and status light .............................10 Chapter 2: Set up your Chromebook 3120..................11 Chapter 3: Specifications of Chromebook 3120................12 Dimensions and weight..............................12 Processor..................................... 12 Chipset....................................13 Operating system................................13 Memory....................................13...
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Recommended tools................................. 25 Screw list.....................................25 Major components of Chromebook 3120........................26 Chapter 5: Removing and installing Customer Replaceable Units (CRUs)........29 Base cover..................................29 Removing the base cover (for models without WWAN)................... 29 Installing the base cover (for models without WWAN)..................32 Chapter 6: Removing and installing Field Replaceable Units (FRUs)..........
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Drivers and downloads..............................103 Frequently asked questions............................103 Chapter 8: Troubleshooting....................... 105 Handling swollen rechargeable Li-ion batteries......................105 Locating the Service Tag or Express Service Code of your Dell computer ............. 105 Chromebook storage..............................106 Overview..................................106 Battery management..............................106 Preparing the Chromebook for long-term storage.................... 107 Getting your Chromebook ready..........................
Views of Chromebook 3120 Right Figure 1. Right view 1. USB 3.2 Gen 1 (5 Gbps) Type-C with DisplayPort Alt Mode port (optional) Connect devices such as external storage devices, printers, and external displays. Provides data transfer speeds up to 5 Gbps.
4. Headset (headphone and microphone combo) port Connect headphones or a headset (headphone and microphone combo). Figure 3. Top view 1. Power button Press to turn on the computer if it is turned off. 2. Keyboard Views of Chromebook 3120...
Enables you to video chat, capture photos, and record videos. 3. Camera-status light Turns on when the camera is in use. 4. Right microphone Provides digital sound input for audio recording and voice calls. 5. Display Provides visual output. Views of Chromebook 3120...
2. Speakers Provide audio output. Service Tag The service tag is a unique alphanumeric identifier that allows Dell service technicians to identify the hardware components in your computer and access warranty information. Views of Chromebook 3120...
Figure 6. Service Tag location Battery charge and status light The following table lists the battery charge and status light behavior of your Chromebook 3120. Table 1. Battery charge and status light behavior Power Source LED Behavior System Power State...
Set up your Chromebook 3120 About this task NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Steps 1. Connect the power adapter and press the power button. CAUTION: Connect the power cable to a power distribution Unit (PDU) 16 A and then connect the PDU to the wall outlet.
NOTE: The weight of your computer depends on the configuration that is ordered and manufacturing variability. Processor The following table lists the details of the processors that are supported in your Chromebook 3120. Table 3. Processor Description Values Processor type...
Chipset The following table lists the details of the chipset that is supported in your Chromebook 3120. Table 4. Chipset Description Values Chipset BGA 1264 Processor Intel Processor N100 DRAM bus width 64-bit Flash EPROM 16 MB PCIe bus Up to Gen3...
Security-cable slot One Wedge-shaped security slot SIM-card slot nano-SIM slot Wireless module The following table lists the Wireless Local Area Network (WLAN) module that is supported on your Chromebook 3120. Table 8. Wireless module specifications Description Values Model number Intel Wi-Fi 6 AX203...
● AES-CCMP ● TKIP Bluetooth wireless card Bluetooth 5.2 wireless card (Chrome) WWAN module The following table lists the Wireless Wide Area Network (WWAN) module supported on your Chromebook 3120. Table 9. WWAN module specifications Description Values Model number Qualcomm Snapdragon SDX12 Global LTE-Advanced...
Microphone Single-array microphone or Dual-array microphones Storage This section lists the storage options on your Chromebook 3120. Your Chromebook 3120 system supports one 64 GB eMMC onboard storage. NOTE: Storage is onboard and cannot be upgraded. Table 11. Storage specifications ...
You can define the primary behavior of the function keys (F1–F12) changing Function Key Behavior in BIOS setup program. Camera The following table lists the camera specifications of your Chromebook 3120. Table 13. Camera specifications Description Values Number of cameras...
Power adapter The following table lists the power adapter specifications of your Chromebook 3120. Table 15. Power adapter specifications Description Values Type 65 W AC adapter, USB Type-C Power-adapter dimensions: Height 28 mm (1.10 in.) Width 51 mm (2.01 in.) Depth 112 mm (4.41 in.)
CAUTION: Dell Technologies recommends that you charge the battery regularly for optimal power consumption. If your battery charge is depleted, connect the power adapter, turn on your computer, and then restart your computer to reduce the power consumption.
Processor Intel UHD Graphics Shared system memory Intel Processor N100 External display support The following table lists the external display support for your Chromebook 3120. Table 20. External display support Graphics card Supported external displays with Supported external displays with...
Table 21. Hardware security Hardware security H1 security chip One Wedge-shaped lock slot Operating and storage environment This table lists the operating and storage specifications of your Chromebook 3120. Airborne contaminant level: G1 as defined by ISA-S71.04-1985 Table 22. Computer environment Description Operating...
You should only perform troubleshooting and repairs as authorized or directed by the Dell technical support team. Damage due to servicing that is not authorized by Dell is not covered by your warranty. See the safety instructions that is shipped with the product or at Dell Regulatory Compliance Home Page.
ESD protection is an increasing concern. Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in previous Dell products. For this reason, some previously approved methods of handling parts are no longer applicable.
● Use a wired ESD wrist strap that is properly grounded. Wireless anti-static straps do not provide adequate protection. Touching the chassis before handling parts does not ensure adequate ESD protection on parts with increased sensitivity to ESD damage. ● Handle all static-sensitive components in a static-safe area. If possible, use anti-static floor pads and workbench pads. ●...
Transporting sensitive components When transporting ESD sensitive components such as replacement parts or parts to be returned to Dell, it is critical to place these parts in anti-static bags for safe transport.
M2.5x5 Bottom-left I/O bracket M2x4 System board M2x4 Display assembly M2.5x5 Display bezel M2.5x3.8 Display panel M2x3 Display hinges M2x3 M2.5x2.5 Major components of Chromebook 3120 The following image shows the major components of Chromebook 3120. Working inside your computer...
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1. Base cover 2. System board 3. Battery 4. Speakers 5. Palm-rest 6. Display assembly 7. I/O board Working inside your computer...
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NOTE: Dell provides a list of components and their part numbers for the original computer configuration purchased. These parts are available according to warranty coverage purchased by the customer. Contact your Dell sales representative for purchase options. Working inside your computer...
Removing and installing Customer Replaceable Units (CRUs) The replaceable components in this chapter are Customer Replaceable Units (CRUs). CAUTION: Customers can replace only the Customer Replaceable Units (CRUs) following the safety precautions and replacement procedures. NOTE: The images in this document may differ from your computer depending on the configuration you ordered. Base cover Removing the base cover (for models without WWAN) Prerequisites...
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Figure 8. Removing the base cover Removing and installing Customer Replaceable Units (CRUs)
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Figure 9. Removing the base cover Figure 10. Disconnecting the battery cable Removing and installing Customer Replaceable Units (CRUs)
Steps 1. Loosen the nine captive (Phillips #1) screws that secure the base cover to the palm-rest assembly. 2. Using a plastic scribe, pry the base cover from the U-shaped indents at the top and continue working on the sides to open the base cover.
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Figure 12. Installing the base cover Removing and installing Customer Replaceable Units (CRUs)
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Figure 13. Installing the base cover Steps 1. Connect the battery cable to the connector (BATT) on the system board. 2. Place the base cover on top of the palm-rest assembly. 3. Align the screw holes on the base cover with the screw holes on the palm-rest assembly, and snap the base cover into place. 4.
To avoid any potential damage to the component or loss of data, ensure that an authorized service technician replaces the Field Replaceable Units (FRUs). CAUTION: Dell Technologies recommends that this set of repairs, if needed, to be conducted by trained technical repair specialists. CAUTION: As a reminder, your warranty does not cover damages that may occur during FRU repairs that are not authorized by Dell Technologies.
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Figure 14. Removing the base cover Removing and installing Field Replaceable Units (FRUs)
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Figure 15. Removing the base cover Removing and installing Field Replaceable Units (FRUs)
1. Loosen the nine captive screws that secure the base cover to the palm-rest assembly. NOTE: For Chromebook 3120 computers shipped with WWAN card, the base cover is secured using Torx 6 (not Phillips #1) screws. 2. Using a plastic scribe, pry the base cover from the U-shaped indents at the top and continue working on the sides to open the base cover.
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Figure 17. Installing the base cover Removing and installing Field Replaceable Units (FRUs)
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Figure 18. Installing the base cover Removing and installing Field Replaceable Units (FRUs)
3. Align the screw holes on the base cover with the screw holes on the palm-rest assembly, and snap the base cover into place. 4. Tighten the nine captive screws to secure the base cover to the palm-rest assembly. NOTE: For Chromebook 3120 computers shipped with WWAN card, the base cover is secured using Torx 6 (not Phillips #1) screws. Next steps 1.
2. Slide the SIM card out from the slot on the system board. NOTE: For Chromebook 3120 computers with WWAN card, the SIM card slot is located on the bottom-left side of the system board. The SIM card must be transferred to the new system board when replacing the system board.
1. Align and slide the SIM card into the SIM card slot on the system board. NOTE: For Chromebook 3120 computers with WWAN card, the SIM card slot is located on the bottom-left side of the system board. The SIM card must be transferred to the new system board when replacing the system board.
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Steps 1. Remove the screw (M2x3) that secures the WWAN-card bracket to the WWAN card on the system board. 2. Remove the WWAN-card bracket from the WWAN card. 3. Disconnect the WWAN antenna cables from the connectors on the WWAN card. 4.
Installing the WWAN card Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task NOTE: The following steps are applicable only for computers that are shipped with a WWAN card. The following image indicates the location of the WWAN card and provides a visual representation of the installation procedure. Removing and installing Field Replaceable Units (FRUs)
● 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 rechargeable Li-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See Contact Support at Dell Support Site.
Figure 20. Removing the battery Steps 1. Open the latch, and using the pull tab, disconnect the battery cable from the connector (BATT) on the system board. 2. Unroute the battery cable from the routing channels between the system board and battery. 3.
Figure 21. Installing the battery Steps 1. Align and place the battery in the slot on the palm-rest assembly. 2. Replace the three (M2x4) screws to secure the battery to the palm-rest assembly. 3. Route the battery cable through the routing channels between the system board and battery. 4.
Figure 22. Removing the battery cable Steps Disconnect the battery cable from the connector on the battery. Installing the battery cable 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 battery cable and provides a visual representation of the installation procedure.
Figure 23. Installing the battery cable Steps Connect the battery cable to the connector on the battery. Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in After working inside your computer. Keyboard Removing the keyboard Prerequisites 1.
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Figure 24. Removing the keyboard Removing and installing Field Replaceable Units (FRUs)
Figure 25. Removing the keyboard Steps 1. Unroute the battery cable from the routing channels between the system board and battery. 2. Push the release tabs and disconnect the keyboard cable from the connector (KB) on the system board. 3. Turn the computer over and open the display to an angle of 180 degrees with the keyboard facing up. 4.
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Figure 26. Installing the keyboard Removing and installing Field Replaceable Units (FRUs)
Figure 27. Installing the keyboard Steps 1. Carefully insert the keyboard cable through the gap on the palm-rest assembly. 2. Align and place the keyboard on the palm-rest assembly. 3. Gently press the keyboard and snap it into place. 4. Close the display completely and turn the computer over. 5.
Figure 28. Removing the I/O-board cables (24-pin and 50-pin) Steps 1. Lift the cable-connector latch and disconnect the 24-pin I/O-board cable from the connector on the system board. 2. Lift the cable-connector latch and disconnect the 24-pin I/O-board cable from the connector on the I/O board. 3.
Figure 29. Installing the I/O-board cables (24-pin and 50-pin) Steps 1. Connect the 24-pin I/O-board cable to the connector on the system board and press down the cable-connector latch to secure the cable in place. 2. Connect the 24-pin I/O-board cable to the connector on the I/O board and press down the cable-connector latch to secure the cable in place.
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Figure 30. Removing the I/O board Steps 1. Lift the cable-connector latch and disconnect the 24-pin I/O-board cable from the connector on the I/O board. 2. Lift the cable-connector latch and disconnect the 50-pin I/O-board cable from the connector on the I/O board. 3.
Figure 31. Type-C brackets not to be removed 5. Remove the four (M2x4) screws that secure the I/O board in place. 6. Slide and remove the I/O board from the computer. Installing the I/O board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the I/O board and provide a visual representation of the installation procedure.
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Figure 32. Installing the I/O board Steps 1. Align and place the I/O board on the palm-rest assembly. 2. Replace the four (M2x4) screws to secure the I/O board in place. 3. Align and place the Type-C bracket on the I/O board. 4.
2. Install the SIM card (for computers that are shipped with WWAN antennas). 3. Install the base cover. 4. Follow the procedure in After working inside your computer. Speakers Removing the speakers Prerequisites 1. Follow the procedure in Before working inside your computer.
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Figure 33. Removing the speakers Steps 1. Peel back the transparent tape that secures the speaker cable to the palm-rest. 2. Disconnect the speaker cable from the connector (SPEAKER) on the system board. 3. Peel the three pieces of adhesive tape that secure the speaker cable to the palm-rest. 4.
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. Figure 34.
NOTE: The speaker cable must be routed through the routing channels at the bottom of the palm-rest to avoid damaging the speaker cable when installing the base cover. 3. Adhere the three pieces of adhesive tape to secure the speaker cable on the palm-rest. 4.
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1. WLAN card (WL1) connector 2. Display cable (EDP) connector 3. Speaker cable (SPEAKER) connector 4. Battery cable (BATT) connector 5. Keyboard cable (KB) connector 6. Touchpad cable (TP) connector 7. 50-pin I/O-board connector 8. 24-pin I/O-board connector The following images indicate the location of the system board and provide a visual representation of the removal procedure. Figure 36.
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Figure 37. Removing the system board Steps 1. Unroute the battery cable from the routing channels between the system board and battery. 2. Remove the (M2x3) screw that secures the WLAN card bracket to the WLAN card module on the system board. 3.
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NOTE: Do not remove the Type-C brackets located underneath the I/O board or system board. Figure 38. Type-C brackets not to be removed 13. Carefully lift and remove the system board from the left side of the palm-rest assembly. NOTE: Lifting the system board from another side can damage components that are connected to the palm-rest.
Installing the system board Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the connectors on your system board. Figure 40. System board connectors 1. WLAN card (WL1) connector 2.
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Figure 41. Installing the system board Removing and installing Field Replaceable Units (FRUs)
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Figure 42. Installing the system board NOTE: If the thermal pad on the palm-rest underneath the system board gets detached, adhere it back on the palm-rest. Steps 1. Place the system board on the palm-rest assembly. 2. Align the screw holes on the system board with the screw holes on the palm-rest assembly. 3.
Display assembly Removing the display assembly Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the WWAN card(for computers that are shipped with WWAN card). About this task The following images indicate the location of the display assembly and provide a visual representation of the removal procedure. Figure 43.
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Figure 44. Removing the display assembly Removing and installing Field Replaceable Units (FRUs)
Figure 45. Display assembly Steps 1. Remove the (M2x3) screw that secures the WLAN card bracket to the WLAN card module on the system board. 2. Remove the WLAN card bracket from the WLAN card module that secures the two antenna cables. 3.
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Figure 46. Installing the display assembly Removing and installing Field Replaceable Units (FRUs)
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Figure 47. Installing the display assembly Removing and installing Field Replaceable Units (FRUs)
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Figure 48. Installing the display assembly Steps 1. Place the palm-rest assembly on a flat surface. 2. Align the display assembly such that the screw holes on the display hinges align with the screw holes on the palm-rest assembly. 3. Replace the six (M2.5x5) screws to secure the display assembly to the palm-rest assembly. 4.
Display bezel Removing the display bezel Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the WWAN card (for computers that are shipped with a WWAN card). 4. Remove the display assembly.
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Figure 50. Removing the display bezel Steps 1. Using a plastic scribe, peel the stickers that cover the display bezel screws. NOTE: A new set of stickers is included with a replacement display bezel. When replacing the new display bezel, adhere the new stickers over the screws once the screws have been secured.
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Figure 51. Peel the four bezel stickers 2. Remove the four (M2.5x3.8) screws that secure the display bezel to the display assembly. 3. Using a plastic scribe, carefully pry open the two recesses along the bottom side of the display bezel near the hinge caps. Removing and installing Field Replaceable Units (FRUs)
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Figure 52. Pry the display bezel from the two recesses near the hinge caps 4. Using a plastic scribe, continue to pry open the outside edges at the bottom side of the display bezel. NOTE: Carefully pry the display bezel as peeling the adhesive on the display bezel can damage the display panel. 5.
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Figure 53. Prying the display bezel at bottom edges 6. Pry open the outside edges of the left, right, and top sides of the display bezel. Removing and installing Field Replaceable Units (FRUs)
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Figure 54. Prying the display bezel from the left and right sides Removing and installing Field Replaceable Units (FRUs)
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Figure 55. Prying the display bezel from the top side 7. Remove the display bezel from the display assembly. Removing and installing Field Replaceable Units (FRUs)
Figure 56. Remove the display bezel Installing the display bezel Prerequisites If you are replacing a component, remove the existing component before performing the installation procedure. About this task The following images indicate the location of the display bezel and provide a visual representation of the installation procedure. Removing and installing Field Replaceable Units (FRUs)
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Figure 57. Installing the display bezel Removing and installing Field Replaceable Units (FRUs)
Figure 58. Installing the display bezel Steps 1. Align and place the display bezel on the display assembly. 2. Starting from the top corner, press on the display bezel and work around the entire bezel until it clicks onto the display assembly.
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2. Remove the base cover. 3. Remove the WWAN card (for computers that are shipped with a WWAN card). 4. Remove the display assembly. 5. Remove the display bezel. About this task The following images indicate the location of the display panel and provide a visual representation of the removal procedure. Figure 59.
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Figure 60. Removing the display panel Removing and installing Field Replaceable Units (FRUs)
Figure 61. Display panel Steps 1. Peel the conductive tape that secures the display panel in place at the bottom-left side of the display panel. 2. Remove the four (M2x3) screws that secure the display panel to the display assembly. 3.
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Figure 62. Installing the display panel Removing and installing Field Replaceable Units (FRUs)
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Figure 63. Installing the display panel Removing and installing Field Replaceable Units (FRUs)
Figure 64. Installing the display panel Steps 1. Connect the display cable to the connector on the back of the display panel. 2. Adhere the rubber spacer on the display cable. 3. Adhere the transparent tape on the display cable connector. 4.
3. Remove the WWAN card (for computers that are shipped with a WWAN card). 4. Remove the display assembly. 5. Remove the display bezel. About this task The following image indicates the location of the front-facing camera and provides a visual representation of the removal procedure.
Figure 66. Installing the front-facing camera Steps 1. Align and place the camera module into the slot on the display assembly. 2. Gently press the camera module until it clicks into place. 3. Adhere the foil tape to secure the camera module. 4.
Figure 67. Removing the display hinges Steps 1. Peel back the conductive tape that secures the display cable to the left-display hinge. 2. Remove the two (M2x3) screws and the four (M2.5x2.5) screws that secure the display hinges to the display back-cover. 3.
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Figure 68. Installing the display hinges Steps 1. Align the screw holes on the display hinges with the screw holes on the display back-cover. 2. Replace the two (M2x3) screws and the four (M2.5x2.5) screws to secure the display hinges to the display back-cover. 3.
Display cable Removing the display cable Prerequisites 1. Follow the procedure in Before working inside your computer. 2. Remove the base cover. 3. Remove the WWAN card (for computers that are shipped with a WWAN card). 4. Remove the display assembly.
Steps 1. Peel back the conductive tape from the left-display hinge that secures the display cable in place. 2. Disconnect the display cable from the connector on the camera module. 3. Peel back the conductive tape that secures the display cable in place. 4.
2. Route the display cable through the routing channel on the display back cover. 3. Adhere the conductive tape to secure the display cable in place. 4. Connect the display cable to the connector on the camera module. 5. Adhere the conductive tape on the left-display hinge to secure the display cable in place. Next steps 1.
Figure 71. Removing the display back cover and antenna assembly NOTE: The display back cover and antenna assembly cannot be further disassembled once all the components in the prerequisite steps have been removed. If the WLAN and/or WWAN antenna cables are malfunctioning and are required to be replaced, replace the entire display back cover and antenna assembly.
Figure 72. Installing the display back-cover and antenna assembly Steps Place the display back-cover and antenna assembly on a flat surface and install the components listed in Next steps to complete the display back-cover and antenna assembly. Next steps 1. Install the display cable.
5. Remove the keyboard. 6. Remove the I/O-board cables (24-pin and 50-pin). 7. Remove the board. 8. Remove the display assembly. 9. Remove the system board. 10. Remove the speakers. About this task The following image shows the palm-rest assembly after all the components in the prerequisite steps have been removed. Figure 73.
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Figure 74. Installing the palm-rest assembly NOTE: If the thermal pad on the palm-rest underneath the system board gets detached, adhere it back onto the palm-rest. Steps Place the palm-rest assembly on a flat surface and install the components that are listed in Next steps to complete the palm-rest installation.
Your Chromebook 3120 supports the following operating systems: ChromeOS Drivers and downloads When troubleshooting, downloading, or installing drivers, it is recommended that you read the Dell Knowledge Base article Drivers and Downloads FAQs 000123347. Frequently asked questions The following are frequently asked questions: Table 24.
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Table 24. Frequently asked questions (continued) Frequently asked questions Responses Why does my Chromebook need my You have to use your Google Account to sign in to your Chromebook. It is the same Google Account information? account that you use for Google services such as Gmail and Drive. Your Chromebook uses your account information to automatically sign you into apps and services.
● Using a non-Dell or incompatible battery may increase the risk of fire or explosion. Replace the battery only with a compatible battery purchased from Dell that is designed to work with your Dell computer. Do not use a battery from other computers with your computer.
Failure to follow these steps could cause your batteries to reach a critically low charge when the Chromebook is stored for long periods of time, and can result in permanent failure of the battery. Dell provides a standard 1-year warranty on batteries.
Preparing the Chromebook for long-term storage Prerequisites Update your Chromebook to the latest version of the ChromeOS and charge so that the battery is at least 80% full. This ensures that even when the battery discharges while unplugged over the summer, power is not fully depleted. In order to slow the discharge rate during storage, use the same process that the factory uses before they ship devices.
6. Install the battery. 7. Install the base cover. 8. Connect the power adapter to the computer. 9. Turn on the computer. NOTE: For more information about performing a hard reset, search in the Knowledge Base Resource at the Dell Support Site. Troubleshooting...
Getting help and contacting Dell Self-help resources You can get information and help on Dell products and services using these self-help resources: Table 25. Self-help resources Self-help resources Resource location Information about Dell products and services Dell Site Tips Online help for operating system...
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