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Dell P29T Service Manual
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Dell P29T Service Manual

Dell P29T Service Manual

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Dell Chromebook 3100
Service Manual
Regulatory Model: P29T
Regulatory Type: P29T001

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Summary of Contents for Dell P29T

  • Page 1 Dell Chromebook 3100 Service Manual Regulatory Model: P29T Regulatory Type: P29T001...
  • Page 2 A WARNING indicates a potential for property damage, personal injury, or death. © 2019 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 1 Working on your computer......................5 Safety instructions................................5 Storing Chromebooks for long term - best practices....................... 5 Before working inside your computer..........................6 After working inside your computer............................6 2 Technology and components......................7 USB features..................................7 Keyboard....................................9 Keyboard keys function..............................9 Touchpad....................................
  • Page 4 Replacing palmrest assembly............................71 5 Troubleshooting......................... 73 Basic troubleshooting................................73 Power issues...................................73 CROSH....................................77 CROSH commands................................77 Chrome commands................................79 Commonly used CROSH command..........................85 Check battery charging status............................ 85 Reset Chromebook................................92 Recovery Chromebook...............................95 Recovering the Chromebook............................95 6 Getting help..........................98 Contacting Dell..................................98 Contents...

  • Page 5: 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: Before Working Inside Your Computer

    1. Connect the Chromebooks to a charger and a power source, which will get them out of the battery disconnect state. Power up your device. 2. Connect your Chromebooks to WiFi and update them to the latest Chrome OS release. a.

  • Page 7: Technology And Components

    Technology and components NOTE: Instructions provided in this section are applicable on computers shipped with Windows 10 operating system. Windows 10 is factory-installed with this computer. Topics: • USB features • Keyboard • Touchpad • Bluetooth USB features Universal Serial Bus, or USB, was introduced in 1996. It dramatically simplified the connection between host computers and peripheral devices like mice, keyboards, external drivers, and printers.
  • Page 8 USB 3.0/USB 3.1 Gen 1 achieves the much higher performance by the technical changes below: • An additional physical bus that is added in parallel with the existing USB 2.0 bus (refer to the picture below). • USB 2.0 previously had four wires (power, ground, and a pair for differential data); USB 3.0/USB 3.1 Gen 1 adds four more for two pairs of differential signals (receive and transmit) for a combined total of eight connections in the connectors and cabling.

  • Page 9: Keyboard

    Keyboard Dell keyboards have a few extra features to help you browse the web effortlessly and efficiently. The keyboard contains a dedicated search key and a new row of web shortcut keys. A standard USB Windows keyboard can also be used with the Chromebook, using the same keyboard shortcuts.

  • Page 10: Touchpad

    To see more shortcuts, simply press Ctrl+Alt+? To open the keyboard viewer on your screen. Touchpad This page contains information for Dell touchpad gestures. The following table lists some gestures and actions supported by the Chromebook touchpad: Table 4. Touch pad gestures...

  • Page 11: Bluetooth

    Touchpad gestures Place two fingers on the touchpad and move them up and down to scroll vertically, left and right to scroll horizontally. If you have Australian scrolling enabled, move two fingers up to scroll down. (It works in the same way as say, your smartphone or tablet.) If you have multiple browser tabs open, you can also swipe left and right with three fingers to quickly move between tabs.

  • Page 12: Major Components Of Your System

    Major components of your system 1. Base cover 2. System board Major components of your system...
  • Page 13 7. Input and output board NOTE: Dell provides a list of components and their part numbers for the original system configuration purchased. These parts are available according to warranty coverages purchased by the customer. Contact your Dell sales representative for purchase options.

  • Page 14: Removing And Installing

    Removing and Installing Base cover Removing the base cover Prerequisites 1. Follow the procedure in before working inside your computer. Steps 1. Loosen the nine captive screws that secure the base cover to the computer. 2. Pry the base cover from the edge using a plastic scribe [1, 2]. Removing and Installing...
  • Page 15 NOTE: While removing the base cover, on-site technicians must take care to remove the base cover carefully. There are prying recess points next to the left and right hinges which ease the disassembly procedure. With the help of a plastic scribe, pry open from the upper left side of the base cover, continue working your way around the left and right side of the base cover, then remove the base cover from the system.

  • Page 16: Installing The Base Cover

    Installing the base cover Steps 1. Align the base cover on the computer and press the edges of the cover until it clicks into place. Removing and Installing...
  • Page 17 2. Tighten the nine captive screws to secure the base cover to the computer. Removing and Installing...

  • Page 18: Battery

    If the battery gets stuck inside your computer as a result of swelling, do not try to release it as puncturing, bending, or crushing a lithium-ion battery can be dangerous. In such an instance, contact Dell technical support for assistance. See www.dell.com/contactdell.

  • Page 19: Removing The Battery

    Removing the battery Prerequisites 1. Follow the procedure in before working inside your computer 2. Remove the base cover. During a service incident, it is possible that a component of the system board could become damaged if the CAUTION: battery is disconnected from the system board prior to initiating the battery cut-off. Steps 1.
  • Page 20 9. Pry the battery from the bottom edge [1] and remove the battery from the computer [2]. Removing and Installing...

  • Page 21: Installing The Battery

    Installing the battery Steps 1. Peel the protective film before installing the battery [1]. 2. Align the battery into the slot on the computer and press the battery on the upper left corner to fix it to the palmrest [2]. 3.
  • Page 22 5. Reroute the battery cable and connect the cable to the connector on the system board [1, 2]. 6. Connect the AC adaptor into the device to recover the battery from cutoff mode. Removing and Installing...

  • Page 23: Speaker

    Next steps 1. Install the base cover. 2. Follow the procedure in after working inside your computer. Speaker Removing the speakers Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. Steps 1.
  • Page 24 5. Lift the speakers away from the computer. Removing and Installing...

  • Page 25: Installing The Speakers

    Installing the speakers Steps 1. Place the speakers into the slots on the computer. Removing and Installing...
  • Page 26 2. Reroute the speaker cable through the retention clips in the routing channel. Removing and Installing...
  • Page 27 3. Connect the speaker cable to the connector on the system board [1]. 4. Affix the adhesive tapes to secure the speaker cable to the computer [2, 3]. Removing and Installing...

  • Page 28: Input Output Board

    Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in after working inside your computer. Input Output board Removing the Input and output board Prerequisites NOTE: The input and output board depends on the configuration ordered. Not all system configuration come with the input and output board.
  • Page 29 3. Remove the two (M2.0x4.0) screws that secure the IO board bracket to the IO board [1]. 4. Use a plastic scribe to lift the IO board bracket away from the palmrest [2]. Removing and Installing...

  • Page 30: Installing Input Output Board

    5. Remove the two (M2.0x4.0) screws that secure the IO board to the palmrest [1]. 6. Lift the IO board away from the computer [2]. Installing Input output board Steps 1. Place the IO board to its slot in the computer [1]. 2.
  • Page 31 3. Place the IO board bracket to its slot and replace the two (M2.0x4.0) screws that secure the bracket to the IO board [1, 2]. 4. Connect the Type-C power cable to the connector on the IO board [1]. Removing and Installing...

  • Page 32: Keyboard Lattice And Keyboard

    5. Connect the 30-pin and 40-pin IO board cables and close the latch to secure it to the IO board [2]. Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in after working inside your computer.
  • Page 33 2. Press the keyboard until it clicks into place and then close the LCD fully before turning the system over [1, 2] 3. Pull the keyboard cable from the gap in the palmrest and connect it to the connector on the system board. Removing and Installing...

  • Page 34: Removing The Keyboard

    Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in after working inside your computer. Removing the keyboard Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3.
  • Page 35 3. Use a plastic scribe to release the keyboard from the two release holes in the system [2]. NOTE: The two release holes for the keyboard are indicated by the "KB" labeling. Removing and Installing...
  • Page 36 4. Turn the system over and carefully lift the keyboard and then pull the keyboard cable through the gap in the palm rest. 5. Lift and pull the keyboard out from the computer. Removing and Installing...

  • Page 37: System Board

    System board Removing the system board Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the base cover. 3. Remove the battery. Steps 1. Disconnect the input output board cables [1], touchpad cable [2] and the keyboard cable [3]. 2.
  • Page 38 3. Remove the single (M2x3) screw that secures the WLAN bracket to the system board [1], and lift the WLAN bracket from the system board [2]. 4. Disconnect the two wireless antennas from the connector on the system board [3]. 5.
  • Page 39 7. Lift the system board bracket away from the computer. Removing and Installing...
  • Page 40 8. Remove the four (M2.0x4.0) screws that secure the system board to the palmrest [1]. 9. Lift and remove the system board from the computer [2]. Removing and Installing...

  • Page 41: Installing System Board

    Installing system board Steps 1. Align the screw holes on the system board with the screw holes and slide the system board on the computer [1]. 2. Replace the four (M2.0x4.0) screws to secure the system board to the palmrest [2]. Removing and Installing...
  • Page 42 Removing and Installing...
  • Page 43 3. Place the IO board bracket in its place on the system board. 4. Reconnect the antennas to the wireless module [1], place the wireless bracket and secure it with the single (M2.0x3.0) screw [2, 3]. 5. Connect the display cable to the connector on the system board and secure the adhesive tape [4, 5]. 6.
  • Page 44 7. Connect the Type-C power cable and the speaker cable to the connectors on the system board [1, 2]. Removing and Installing...
  • Page 45 8. Connect the 30-pin IO board cable, 40-pin IO board cable, and the touchpad cable to the connectors on the system board and close the latches [1, 2]. 9. Connect the keyboard cable to the connector on the system board [3]. Removing and Installing...

  • Page 46: Display Assembly

    Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in after working inside your computer. Display assembly Removing display assembly Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the base cover.
  • Page 47 3. Remove the single (M2.0x4.0) screw that secures the display cable bracket to the system board [1] 4. Lift away the display bracket [2]. NOTE: The screw securing the display cable bracket also secures the left IO bracket to the system board, as a result removal of the display cable bracket leaves the left IO bracket unsecured.
  • Page 48 6. Open the system to 180 degrees and place the computer on a flat surface, with the display hinges facing up. 7. Remove the six (M2.5x5.0) display hinge bracket screws that secure the display assembly to the system [1]. 8. Lift the display assembly away from the system [2]. Removing and Installing...

  • Page 49: Installing Display Assembly

    Installing display assembly Steps 1. Place the chassis on a plane surface. 2. Align the display assembly with the screw holders on the system [1]. 3. Replace the six (M2.5x5.0) display hinge bracket screws that secure the display assembly to the system [2]. Removing and Installing...
  • Page 50 4. Lift the system and close the display. 5. Connect the display cable to the connector on the system board [1]. 6. Affix the adhesive tape to secure the display cable to the system [2]. 7. Place the display cable bracket to secure the display cable [3]. 8.
  • Page 51 9. Connect the wireless antennas to the wireless module [1]. 10. Place the wireless bracket to secure the wireless antennas and replace the single (M2.0x3.0) screw that secures the wireless bracket to the system [2, 3]. Removing and Installing...

  • Page 52: Display Bezel

    Next steps 1. Install the battery. 2. Install the base cover. 3. Follow the procedure in after working inside your computer. Display bezel Removing display bezel Prerequisites 1. Follow the procedure in before working inside your computer. 2. Remove the base cover.
  • Page 53 Removing and Installing...
  • Page 54 2. Use a plastic scribe to carefully pry open the upper right or upper left corner of the outside edge of the display bezel and continue to pry open the outside edge of the top side of the display bezel and then pry open the outside edge of the left and right sides of the display bezel.
  • Page 55 4. Continue to pry open the bottom outside edge of the display bezel and carefully pry open the bottom inside edge of the display bezel. NOTE: Be careful when prying the display bezel as peeling the adhesive on display bezel may damage the display panel.

  • Page 56: Installing Display Bezel

    Installing display bezel Steps 1. Place the display bezel on the display assembly. Removing and Installing...
  • Page 57 2. Starting from the top corner, press on the display bezel and work around the entire bezel until it clicks on to the display assembly. NOTE: A new set of bezel stickers are included with any replacement display bezel. When replacing the new display bezel, adhere the new caps over the screws once the screws have been secured.
  • Page 58 3. Replace the four (M2.5x3.5) screws to secure the display bezel to the display assembly. NOTE: A new set of bezel stickers are included with any replacement display bezel. When replacing the new display bezel, adhere the new caps over the screws once the screws have been secured. Removing and Installing...
  • Page 59 4. Adhere the four bezel stickers over the screws once the screws have been secured. NOTE: A new set of bezel stickers are included with any replacement display bezel. When replacing the new display bezel, adhere the new caps over the screws once the screws have been secured. Removing and Installing...

  • Page 60: Display Panel

    Next steps 1. Install the display assembly. 2. Install the battery. 3. Install the base cover. 4. Follow the procedure in after working inside your computer. Display panel Removing display panel Prerequisites 1. Follow the procedure in before working inside your computer.
  • Page 61 2. Peel the conductive tape securing the display cable on the back of the display panel [1]. 3. Peel and remove the rubber spacer covering the display cable [2]. 4. Lift the latch and disconnect the display cable from the connector on the display panel [3, 4]. 5.

  • Page 62: Installing Display Panel

    Installing display panel Steps 1. Align and place the display panel. 2. Connect the display cable to the connector on the display panel and close the latch [1, 2]. 3. Affix the rubber spacer [3] and then the conductive tape to secure the display cable on the back of the display panel [4]. 4.
  • Page 63 5. Replace the four (M2.0x3.0) screws to secure the display panel to the display assembly. Removing and Installing...

  • Page 64: Display Hinges

    Next steps 1. Install the display bezel. 2. Install the display assembly. 3. Install the battery. 4. Install the base cover. 5. Follow the procedure in after working inside your computer. Display hinges Removing display hinge Prerequisites 1. Follow the procedure in before working inside your computer.

  • Page 65: Installing Display Hinge

    Installing display hinge Steps 1. Place the display hinge on the display cover [1]. 2. Replace the four (M2.5x2.5) screws and two (M2.0x3.0) screws to secure the display hinge to the display cover [2]. Removing and Installing...

  • Page 66: Display Cable

    3. Reroute the display cable and the rubber stopper back into the hinge cap. Next steps 1. Install the display panel. 2. Install the display assembly. 3. Install the battery. 4. Install the base cover. 5. Follow the procedure in after working inside your computer.

  • Page 67: Installing Display Cable

    6. Remove the display panel. Steps 1. Peel the adhesive tape that covers the camera cable connector [1]. 2. Peel the adhesive tape that secures the display cable and lift the display cable away from the display back cover and antenna assembly [2].

  • Page 68: Camera

    Next steps 1. Install the display panel. 2. Install the display bezel. 3. Install the display assembly. 4. Install the battery. 5. Install the base cover. 6. Follow the procedure in after working inside your computer. Camera Removing camera Prerequisites 1.

  • Page 69: Installing Camera

    Installing camera Steps 1. Align and place the camera to its slot in the display assembly [1]. 2. Connect the camera cable to the connector on the display assembly [2]. Removing and Installing...

  • Page 70: Display Back Cover

    Next steps 1. Install the display panel. 2. Install the display assembly. 3. Install the battery. 4. Install the base cover. 5. Follow the procedure in after working inside your computer. Display back cover Replacing display back cover and antenna assembly Prerequisites 1.

  • Page 71: Palm Rest

    NOTE: The display back-cover and antenna assembly cannot be further disassembled once all of the pre-removal parts procedures are completed. If the wireless antennas are malfunctioning and need to be replaced, replace the entire display back-cover and antenna assembly. Next steps 1.
  • Page 72 Steps The component you are left with is the palmrest. NOTE: The palmrest assembly cannot be further disassembled once all of the pre-removal parts procedures are completed. If the touchpad frame, touchpad support bracket, touchpad mylar, touchpad module, touchpad cable, conductive tape or thermal pad are malfunctioning and need to be replaced, replace the entire palm-rest assembly.

  • Page 73: Troubleshooting

    Troubleshooting Basic troubleshooting This page contains all the information for Dell Chromebook 3100 basic troubleshooting. NOTE: Refer to Google Help Center for the online troubleshooter. NOTE: Resetting the Chromebook, also known as Powerwash, can be attempted before Recovering the Chromebook.
  • Page 74 Display issue 1. Make sure that the Chromebook is on. If you are using the battery, plug the Chromebook in and press the power button. 2. Restart the Chromebook by holding the power button down until the device turns off, then turn it back on again. 3.
  • Page 75 Bluetooth issue Table 8. Bluetooth issue Bluetooth issue Issue Possible solutions If you run into issues while attempting to pair or use a Bluetooth device with the Chromebook, try the following steps to resolve the issue: 1. First, make sure that the Bluetooth device you are trying to pair is supported by the Chromebook.
  • Page 76 Chrome OS issue Table 10. Chrome OS issue Chrome OS issues If the Chromebook becomes slow or unresponsive, and the He's Dead, Jim! error message appears, the system could be running low on memory. NOTE: If you terminated the process using Google Chrome's Task Manager, the system's task manager, or with a command line tool, this message will appear as He’s Dead, Jim! error message...

  • Page 77: Crosh

    The Chrome OS does not support ePSA, Dell BIOS, the F12 boot menu, or DellConnect. There are no preboot diagnostics. All troubleshootings must be done inside the OS. Chrome Shell (CROSH) and the Chrome URL commands provide some troubleshooting tools, information, and advanced settings.
  • Page 78 Command Purpose ssh_forget_host Removes a host from the list of known ssh hosts. This command displays a menu of known hosts and prompts for the host to forget. Sets the chaps debug logging level. No arguments start verbose logging Table 12. Advanced help command Command Purpose battery_test[<test length>]...

  • Page 79: Chrome Commands

    Command Purpose [duration] will start recording. sound play <filename> plays the recorded audio samples storage_status Reads storage device SMART health status, vendor attributes, and error logs. 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.
  • Page 80 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 81 3. chrome://downloads: This is also available from the Menu > Downloads. Shortcut key is Ctrl+J. 4. chrome://extensions: This is also available from the Menu > Tools > Extensions. 5. chrome://bookmarks: This is also available from the Menu > Bookmarks > Bookmark Manager. Short cut key is Ctrl+Shift+O. Troubleshooting...
  • Page 82 6. chrome://history: This is also available from the Menu > History. Short cut key is Ctrl+H. 7. chrome://memory: This will redirect to “chrome://memory-redirect/”. This will display the memory used by the Google Chrome browser. This also displays all the process related to browser with their PID, process name, and the memory it takes. Troubleshooting...
  • Page 83 NOTE: Net-internals events viewer and related functionality has been removed. Please use Chrome://net-export to save netlogs and the external Catapult netlog_viewer to view them. chrome://net-internals: This displays all networking related information. Use this to capture network events generated by the browser.
  • Page 84 11. chrome://settings: This is also available from the Menu > Options (on Windows), and Menu > Preferences (on Linux). From here you can control various browser related settings. 12. chrome://sync-internals: This gives information about the Chrome sync feature, including the Sync URL used by Google, and sync statistics.

  • Page 85: Commonly Used Crosh Command

    Commonly used CROSH command This page contains information about the most commonly used CROSH commands to diagnose the Dell Chromebook 3100. Below are some of the most commonly used CROSH commands to troubleshoot a hardware issue. NOTE: CROSH storage_test_1 and storage_test_2 are not supported on the eMMC storage device.
  • Page 86 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. Disconnect the AC adapter from the Chromebook. 2. Turn on and sign in to Chromebook. 3.
  • Page 87 5. Type battery_test 1 into CROSH, and then press Enter. 6. A screen displays the current battery health and discharge rate. • If the Battery health percentage is greater than 50%, the battery is within the expected wear limits. • 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.
  • Page 88 3. Press CTRL + ALT + T to open CROSH. 4. Type memory_test into CROSH, and then press Enter. Troubleshooting...
  • Page 89 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: Follow the instruction to gather the information about the network and diagnose the network errors.
  • Page 90 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. Troubleshooting...
  • Page 91 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. Troubleshooting...

  • Page 92: Reset Chromebook

    7. If the diagnostic test returns a failure message, make sure the Wi-Fi adapter is enabled and connect to a network. Reset Chromebook This page contains all information about resetting Dell Chromebook 3100. All local user data stored on the Chromebook can be cleared by resetting it to its original factory state (also known as Powerwash).
  • Page 93 2. Click Settings as highlighted from the screenshot below. 3. Click Show advanced settings to expand the menu. Troubleshooting...
  • Page 94 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 95: Recovery Chromebook

    Recovery Chromebook This page contains information about recovering Dell Chromebook 3100. Recovering the 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 96 Operating System Instructions 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. Your USB drive or SD card should now be ready to use for recovery.
  • Page 97 Question Solution You successfully recovered your Chromebook but now you can not After you have completed recovery, you need to format your USB use your USB or SD card with Windows or SD card using the recovery tool. You successfully recovered your Chromebook but now Windows After you have completed recovery, you need to format your USB does not recognize the whole size of the USB or SD card used for or SD card using the recovery tool.

  • Page 98: Getting Help

    About this task 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: Steps 1.

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Chromebook 3100

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