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Dell P26T001 Service Manual

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Inspiron 3181 2-in-1
Service Manual
Regulatory Model: P26T
Regulatory Type: P26T001
October 2020
Rev. A01

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Summary of Contents for Dell P26T001

  • Page 1 Inspiron 3181 2-in-1 Service Manual Regulatory Model: P26T Regulatory Type: P26T001 October 2020 Rev. A01...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2017 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: Table Of Contents

    Contents Chapter 1: Working on your computer................... 5 Safety instructions................................5 Before working inside your computer..........................5 After working inside your computer..........................6 Chapter 2: Disassembly and reassembly..................7 Recommended tools................................7 Screw size list..................................7 microSD card..................................7 Removing microSD card............................... 7 Installing microSD card..............................8 Base cover.....................................8 Removing base cover..............................8 Installing base cover..............................9...
  • Page 4 Verified Boot.................................29 Disk Partition Map...............................30 Developer and Recovery mode..........................31 Coreboot and U-boot Custom Firmware........................31 Chrome vs Chromium OS............................31 View system information..............................32 Dell activity light................................34 Chapter 4: Diagnostic and troubleshooting..................36 Dell activity light................................36 Basic troubleshooting...............................36 Power issues.................................36 CROSH....................................40 CROSH commands................................

  • Page 5: Chapter 1: Working On Your Computer

    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.

  • Page 6: After Working Inside Your Computer

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

  • Page 7: Chapter 2: Disassembly And Reassembly

    Disassembly and reassembly Recommended tools The procedures in this document require the following tools: ● Phillips #0 screwdriver ● Phillips #1 screwdriver ● Plastic scribe NOTE: The #0 screw driver is for screws 0-1 and the #1 screw driver is for screws 2-4 Screw size list Table 1.

  • Page 8: Installing Microsd Card

    Installing microSD card 1. Slide the SD card into its slot until it clicks into place. 2. Install the microSD card. 3. Follow the procedure in After working inside your computer. Base cover Removing base cover 1. Follow the procedure in Before working inside your computer.

  • Page 9: Installing Base Cover

    Installing base cover If the system is shipped with M.2 SSD perform the following steps. 1. Toe in the base cover front edge into the system. 2. Press the edges of the cover until it clicks into place. 3. Replace the M2.5x7 screws to secure the base cover to the computer. 4.

  • Page 10: Installing Battery

    Installing battery 1. Insert the battery into the slot on the computer. 2. Connect the battery cable to the connector on the battery. 3. Replace the M2x3 screws to secure the battery to the computer. 4. Install the: base cover microSD card 5.
  • Page 11 NOTE: The two release holes for the keyboard are indicated by the "KB" labeling. 4. Slide the keyboard outwards, away from the computer. Disassembly and reassembly...
  • Page 12 NOTE: Carefully pull the keyboard connector through the gap in the palm rest. 5. Lift the keyboard away from the computer. Disassembly and reassembly...

  • Page 13: Installing Keyboard

    Installing keyboard 1. Align the keyboard trim with the tabs on the computer, and press it until it clicks into place. 2. Connect the keyboard cable on the system board. 3. Install the: battery Disassembly and reassembly...

  • Page 14: Power Switch Board

    base cover microSD card 4. Follow the procedure in After working inside your computer. Power switch board Removing power switch board 1. Follow the procedure in Before working inside your computer. 2. Remove the: microSD card base cover battery 3. To remove the power switch: a.

  • Page 15: Audio Board

    4. Install the: battery base cover microSD card 5. Follow the procedure in After working inside your computer. Audio board Removing audio board 1. Follow the procedure in Before working inside your computer. 2. Remove the: microSD card base cover battery 3.

  • Page 16: Power Connector Port

    2. Replace the M2x3 screw that secure the audio board to the computer. 3. Connect the audio cable to the connector on the audio board. 4. Install the: battery base cover microSD card 5. Follow the procedure in After working inside your computer.

  • Page 17: Installing Power Connector Port

    Installing power connector port 1. Insert the power connector port into the slot on the computer. 2. Replace the two M2x3 screws that secure the power connector port to the computer. 3. Connect the power connector cable to the connector on the system board. 4.

  • Page 18: Installing Speakers

    Installing speakers 1. Place the speakers into the slots on the computer. 2. Route the speaker cable through the retention clips through routing channel. 3. Affix the adhesive tape to secure the speaker cable on the computer. 4. Connect the speaker cable to the connector on the system board. 5.
  • Page 19 4. Disconnect the sensor cable, and turn over the computer [1, 2] 5. To remove display assembly: Disassembly and reassembly...

  • Page 20: Installing Display Assembly

    a. Remove the display hinge screws M2.5xM5.0 that secure the display assembly to the computer [1]. b. Lift the display assembly away from the computer [2]. Installing display assembly 1. Place the display assembly to align with the screw holders on the computer. 2.

  • Page 21: Display Back Cover

    Display back cover Removing display back cover 1. Follow the procedure in Before working inside your computer. 2. Using the plastic scribe pry the edges of the display back cover. 3. Remove the display back cover away from the computer. Disassembly and reassembly...

  • Page 22: Installing Display Back Cover

    Installing display back cover 1. Align the display back cover with the tabs on the computer, and press it until it clicks into place. 2. Follow the procedure in After working inside your computer. System board Removing system board 1. Follow the procedure in Before working inside your computer.
  • Page 23 5. To remove the metal bracket (WLAN and display cable): a. Remove the M2.0x3.0 screw and lift the metal bracket that secures the WLAN card on the system board [1, 2] b. Disconnect the WLAN cables [3]. c. Remove the screws M2.0x3.0 and lift the metal bracket that secures the display cable on the computer [4, 5] d.
  • Page 24 6. To remove the system board: a. Remove the screws that secure the system board on the palm rest assembly [1]. b. Lift the system board off the palm- rest assembly [2]. Disassembly and reassembly...

  • Page 25: Installing System Board

    Installing system board 1. Align the system board with the screw holders on the computer. 2. Tighten the M2.0x3.0 screws to secure the system board to the computer. 3. Connect the display cable to the connector. 4. Place the metal bracket over the connector and tighten the M2.0x3.0 screws to secure the display cable to the computer. 5.

  • Page 26: Palm Rest

    Palm rest Replacing palm rest 1. Follow the procedure in Before working inside your computer. 2. Remove the: microSD card base cover battery keyboard power switch board audio power connector speaker display assembly system board NOTE: Touchpad is not a standalone component and is assembled along with the palm rest. NOTE: The component you are left with is the palm rest.
  • Page 27 microSD card 4. Follow the procedure in After working inside your computer. Disassembly and reassembly...

  • Page 28: Chapter 3: Software

    Software This section provides information about the operating system, commands, and bundled software for Dell Inspiron Chromebook. Operating system This page contains information about the operating system used by the Dell Chromebook. Chrome OS Chromebooks are powered by the Google Chrome operating system, based on Google's popular Chrome browser. It has been developed to provide a fast, simple, and more secure computing experience for users who spend most of their time online.

  • Page 29: Verified Boot

    Verified Boot Read Only firmware verifies the integrity of Read/Write (R/W) firmware. R/W firmware verifies the active Linux kernel. During run time, the kernel verifies each block read from disk. If a verification step fails and there is no backup option, the machine enters recovery mode. The Developer Mode switch turns off verified boot (at the Kernel stage) to enable users to run Chromium OS (or other OS).

  • Page 30: Disk Partition Map

    Disk Partition Map There are two copies of Chrome OS on disk: an active copy and a backup copy. Each copy consists of a kernel partition and a root file system. The backup copy is updated automatically in the background. Users only need to reboot. The partition contains encrypted user data and is also used in the factory for storing test software.

  • Page 31: Developer And Recovery Mode

    Developer and Recovery mode Table 2. Developer and Recovery mode Developer Mode Recovery Mode ● Used to boot without verification. ● Allows a user to reinstall the Chrome OS from a USB key or SD card. ● Can be turned on via key combination during boot. ●...

  • Page 32: View System Information

    This page contains all the information about viewing system information for the Dell Chromebook. Dell Chromebook does not support Dell BIOS. Hence, there are several ways to check system specifications depending on the information you are searching for. The table below lists some of the most commonly used methods to view system information and specifications.
  • Page 33 Table 4. View system information (continued) Commands Action and Purpose Screenshot Chrome:settin View information such as screen resolution options (Device>Display settings), touchpad, and other basic hardware information. Chrome:system View advanced system information such as the Google Chrome version, BIOS information, CPU information, memory information, network status, power supply information,...

  • Page 34: Dell Activity Light

    Dell activity light This page contains all the information about the Dell Bright Light software that is used to control Dell Activity Light. Overview Dell Activity Light can be used as an indicator for the interaction between school teacher and student, and Dell has designed a software over this feature.
  • Page 35 Raise your Hand/Answer Question/Discussion buttons Students can either click the on-screen button or press keyboard hot key to on/off the Ask question LED. The on-screen button can be the Chrome application in the menu or the shortcut icon on the task bar. MultiColor Poll Students can vote with different LED color by either clicking the on-screen button (suggested) or pressing keyboard hot key.

  • Page 36: Chapter 4: Diagnostic And Troubleshooting

    Dell activity light The Dell Chromebook activity light LED indicator is located on the back of the display cover of Chromebook as shown below: The activity indicator supports 7 colors for Dell Active Classroom Application, including: white, red, green, blue, yellow, cyan, and magenta.
  • Page 37 Table 5. Power issue (continued) Power issues a. If the Chromebook starts, reconnect devices one at a time while restarting the computer to figure out which device is causing the problem. You are done. b. If the Chromebook still does not start or exhibits the same problem, do not reconnect anything, and continue troubleshooting.
  • Page 38 Table 7. Audio, screen, and camera issues (continued) Audio, screen, and camera issues If the speakers are not responding when attempting to listen to audio: 1. Unplug the device from all cables (USB, headphones, and displays). 2. Try playing audio from various sources, including YouTube and audio files stored locally on the Chromebook.
  • Page 39 Table 9. Touchpad and hotkeys issues (continued) Touchpad / Hotkeys issues If the touch pad has stopped responding, try the following steps to resolve the issue: Try moving the cursor after each step: 1. Tap the Esc key several times. 2.

  • Page 40: Crosh

    The Chrome OS does not support ePSA, Dell BIOS, the F12 boot menu, or DellConnect. There are no preboot diagnostics. All troubleshooting must be done inside the OS. Chrome Shell (CROSH) and the Chrome URL commands provide some troubleshooting tools, information, and advanced settings.

  • Page 41: Crosh Commands

    2. Press <Clrl> + <Alt> + <T> The interface appears as shown in the screenshot below: 3. Type in the CROSH command for diagnostics. Type 'help' for a list of available commands. Type help_advanced to display a complete list of commands for debugging purposes Alternately, refer to CROSH Commands for the list of the CROSH commands available for diagnostics.
  • Page 42 Table 12. Advanced help command (continued) Command Purpose bt_console [<agent capability>] Enters a Bluetooth debugging console. The Optional argument specifies the capability of a pairing agent the console provides; see the Bluetooth Core specification for valid options. chaps_debug [start|stop|<log_level>] Sets the chaps debug logging level. No arguments will start verbose logging.

  • Page 43: Chrome Commands

    Table 12. Advanced help command (continued) Command Purpose storage_test_1 Performs a short offline SMART test. storage_test_2 Performs an extensive readability test. syslog <message> Logs a message to system log. tpcontrol{status | taptoclick [on|off] sensitivity [1-5] | set Allows the user to manually adjust advanced touchpad settings.
  • Page 44 Explanation Create Recovery USB Stick chrome://imageburner/ Google's version of DBAR/DBRM Chrome Flags chrome://flags Experimental features beyond the scope of what Dell supports Memory Troubleshooting chrome://memory View running processes and memory utilization Module Load chrome://conflicts Shows conflicts of all modules loaded by...
  • Page 45 Table 14. Helpful chrome commands (continued) Chrome Commands Purpose Screenshot chrome://dns This displays the list of hostnames for which the browser will prefetch the DNS records. chrome://downloads This is also available from the Menu > Downloads. Shortcut key is Ctrl+J. chrome://extensions This is also available from the Menu >...
  • Page 46 Table 14. Helpful chrome commands (continued) Chrome Commands Purpose Screenshot chrome://bookmarks This is also available from the Menu > Bookmarks > Bookmark Manager. Short cut key is Ctrl+Shift+O. chrome://history This is also available from the Menu > History. Short cut key is Ctrl+H. chrome://memory This will redirect to “chrome://memory- redirect/”.
  • Page 47 Table 14. Helpful chrome commands (continued) Chrome Commands Purpose Screenshot chrome://net-internals This displays all networking related information. Use this to capture network events generated by the browser. You can also export this data. You can view DNS host resolver cache. One of the important features in this feature is “Test”.

  • Page 48: Commonly Used Crosh Command

    Google, and sync statistics. Commonly used CROSH command This page contains information about the most commonly used CROSH commands to diagnose the Dell Chromebook. Below are some of the most commonly used CROSH commands to troubleshoot a hardware issue.
  • Page 49 4. Press CTRL + ALT + T to open CROSH. 5. Type battery_test 1 into CROSH, and then press Enter. 6. Check the result to confirm that the battery is charging. Check battery health Follow the steps to evaluate the health of the Chromebook battery, and check the discharge rate: 1.
  • Page 50 2. Turn on and sign in to Chromebook. 3. Open the Chrome browser. 4. Press CTRL + ALT + T to open CROSH. 5. Type battery_test 1 into CROSH, and then press Enter. 6. A screen displays the current battery health and discharge rate. ●...
  • Page 51 ● If the Battery health percentage is equal to or less than 50% and the battery is less than a year old, the battery is outside expected wear limits and might need to be replaced. ● If the test results show that Battery is Unknown, the battery might need to be replaced. Checking memory Follow the steps below to perform a memory check for Chromebook: NOTE:...
  • Page 52 5. A diagnostic screen displays the result of the memory test passed without any errors. Example of a memory test failure. Checking network status If you are having trouble connecting to the Internet, use the steps in one or more of the following sections to test the network adapter: Diagnostic and troubleshooting...
  • Page 53 Follow the instruction to gather the information about the network and diagnose the network errors. 1. Turn on and sign in to Chromebook. 2. Open the Chrome browser. 3. Press CTRL + ALT + T to open CROSH. 4. Type network_diag into CROSH, and then press Enter. Diagnostic and troubleshooting...
  • Page 54 5. Wait while CROSH performs a set of network diagnostic tests. A diagnostic screen displays the results of the network adapter health test. 6. The diagnostic test log is saved as a.txt (plain text) file in the Files app. Diagnostic and troubleshooting...

  • Page 55: Resetting Inspiron Chromebook

    7. If the diagnostic test returns a failure message, make sure the Wi-Fi adapter is enabled and connect to a network. Resetting Inspiron Chromebook This page contains all information about resetting Dell Chromebook. All local user data stored on the Chromebook can be cleared by resetting it to its original factory state (also known as Powerwash).
  • Page 56 2. Click Settings as highlighted from the screenshot below. 3. Click Show advanced settings to expand the menu. Diagnostic and troubleshooting...
  • Page 57 4. Click the Powerwash button. 5. Click Restart when prompted. You can also reset your Chromebook from the sign-in screen by holding down the keys Ctrl+Alt+Shift+R and clicking Restart. (If you are signed in to your Chromebook, sign out first before you press on Ctrl+Alt+Shift+R, then click Restart. Once the Chromebook is restarted, click Reset.) After you restart the Chromebook, you should now see the setup screen.

  • Page 58: Recovering The Inspiron Chromebook

    Recovering the Inspiron Chromebook This page contains information about recovering Dell Chromebook. Recovering the Inspiron Chromebook Install a new version of the Chrome operating system on your Chromebook by going through the recovery process. You may want to go through this process if you are having problems updating your Chromebook or if it stops working.
  • Page 59 Table 15. USB flash drive or SD card (continued) Operating System Instructions 2. Run the tool and follow the instructions that appear on your screen. After the process is complete, you might see an alert saying your USB drive or SD card is unreadable. If this fails, try removing and reinserting your USB drive or SD card.
  • Page 60 Table 16. Troubleshooting tips (continued) Question Solution 3. If the problem persists, contact Google Chrome support team. An error message You are using an out-of-date Chrome You should download an up-to date recovery image. Simply OS recovery image. follow all the instructions exactly as specified in Step 2 above. You successfully recovered your Chromebook but now you After you have completed recovery, you need to format your can not use your USB or SD card with Windows...

  • Page 61: Chapter 5: Contacting Dell

    Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services may not be available in your area. To contact Dell for sales, technical support, or customer service issues: 1. Go to Dell.com/support.

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P26tInspiron 3181 2-in-1

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