Dellcos Chromebook 11-3120 Disassembly And Reassembly Manual

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Dell Chromebook 11 - 3120

Disassembly and Reassembly Guide

Warning: This manual is intended for use by a Dell Certified Technician.

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.

Table of Contents

Summary of Contents for Dellcos Chromebook 11-3120

Page 1 Dell Chromebook 11 - 3120 Disassembly and Reassembly Guide Warning: This manual is intended for use by a Dell Certified Technician. 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 2: Notes, Cautions, And Warnings
Notes, cautions, and warnings NOTE: A NOTE indicates important information that helps you make better use of your computer. CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the problem. WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
Page 3 Chassis This section provides information about the chassis for the Dell™ Chromebook 11 (3120) system.
Page 4: Top View
Top View The Dell™ Chromebook™ 11 (3120) system top view and features are as below:...
Page 5 Chassis Top View Features and Locations Label Description Webcam LED Webcam Microphone Speakers Power Button A-Cover LED ( Interactivity LED)
Page 6: Left View
Left View The Dell™ Chromebook™ 11 (3120) system left view and features are as below: Chassis Left View Features and Locations Label Description DC-in Jack USB 3.0 with BC (Battery Charging) 1.2 HDMI Audio in Jack SD Card Reader...
Page 7: Right View
Right View The Dell™ Chromebook™ 11 (3120) system right view and features are as below: Chassis Right View Features and Locations Label Description Battery LED SIM Card Slot USB 2.0 K-Lock Slot...
Page 8: Bottom View
Bottom View The Dell™ Chromebook™ 11 (3120) system bottom view and features are as below: Chassis Bottom View Features and Locations Label Description Express Service Code Service Tag...
Page 9 Chassis LED This page contains all the information about LEDs on Dell™ Chromebook™ 11 (3120). Battery LED The battery status LED light is located at the right side of the chassis, as shown in the image below. Battery Status LED LED Light Status Description AC powered, charge level higher than 97% Oﬀ...
Page 10 Dell Activity Light LED Light Status Chassis LED Light Blue...
Page 11 Yellow Others Webcam LED...
Page 12 Chromebook 11 (3120) will have a webcam LED indicator on the LCD bezel, as shown in the image below. Webcam Status LED LED Light Status Description Oﬀ Webcam oﬀ White Webcam on...
Page 13 Field Service Information This section covers ﬁeld service information. The information in this section is speciﬁcally for ﬁeld service personnel who perform installation, diagnosis, and repair activities. Field personnel are required to know the issues and procedures in this document whether or not they perform all the service tasks. Information in this section is required knowledge, but should never override regional or local policies and procedures The sections and primary pages in this document are as follows:...
Page 14: Safety Precautions
Safety Precautions Observe the following safety precautions when you perform any installation or break/ﬁx procedures involving disassembly or reassembly: Turn oﬀ the system and all attached peripherals. Disconnect the system and all attached peripherals from AC power, and then remove the battery. Disconnect all network cables, telephone or telecommunications lines from the system.
Page 15 concern. Due to the increased density of semiconductors used in recent Dell products, the sensitivity to static damage is now higher than in earlier Dell products. For this reason some previously approved methods of handling parts are no longer applicable. There are two recognized types of ESD damage: catastrophic and intermittent failures.
Page 16: Antistatic Mat
Handle all static-sensitive components in a static-safe area. If possible, use anti-static ﬂoor pads and workbench pads. When handling static-sensitive components, grasp them by the sides, not the top. Avoid touching pins and circuit boards. When unpacking a static-sensitive component from its shipping carton, do not remove the component from the anti-static packing material until you are ready to install the component.
Page 17 Anti-Static Mat Wrist Strap and Bonding Wire The wrist strap and bonding wire can be either directly connected between your wrist and bare metal on the hardware if the ESD mat is not required, or connected to the anti-static mat to protect hardware that is temporarily placed on the mat.
Page 18 The wires inside of an ESD strap are prone to damage over time. When using an unmonitored kit, it is best practice to regularly test the strap prior to each service call, and at a minimum, test once per week. A wrist strap tester is the best method for doing this test.
Page 19 also be free of insulators that can cause an ESD event. On the work area, insulators such as Styrofoam and other plastics should always be moved at least 12 inches or 30 centimeters away from sensitive parts before physically handling any hardware components. ESD Packaging All ESD-sensitive devices must be shipped and received in static-safe packaging.
Page 20: Lifting Equipment
anti-static bags for transporting sensitive components. Lifting Equipment WARNING: Do not lift greater than 50 pounds. Always obtain assistance from another person or persons, or use a mechanical lifting device. Adhere to the following guidelines when lifting equipment: 1. Get a ﬁrm balanced footing. Keep your feet apart for a stable base, and point your toes out. 2.
Page 21: Tools Required
Tools Required A set of required and optional tools are necessary to service the product. 1. Small Phillips-head screwdriver, size #1 2. Small Phillips-head screwdriver, size #1 3. Plastic scribe 4. Small ﬂat-head screwdriver 5. Tork 5 screwdriver...
Page 22: Disassembly And Reassembly
Disassembly and Reassembly This section covers all the disassembly and reassembly of the Dell™ Chromebook™ 11 (3120).
Page 23 Sim Card Disassembly Sim Card Disassembly Video PREREQUISITES Pre-removal parts: 1. None Sim Card Establishing image.
Page 24 Sim Card Disassembly 1. Remove the T5 screw. 2. Remove the cover.
Page 25 3. Use the push pin to eject the sim card. 4. Remove the sim card.
Page 26 The removal is complete. Sim Card Reassembly 1. Insert the sim card. 2. Close the cover.
Page 27 3. Tighten the T5 screw.
Page 28 Bottom Cover Disassembly Bottom Cover Disassembly Video PREREQUISITES Pre-removal parts: 1. None Bottom Cover Establishing image.
Page 29 Bottom Cover Disassembly 1. Loosen the seven (7) screws securing the bottom cover. 2. Pry up the bottom cover carefully, starting from the top corners.
Page 30 3. Lift up and remove the bottom cover. The removal is complete.
Page 31 Bottom Cover Reassembly 1. Replace the bottom cover back into its original location. 2. Gently push the cover back to make sure that it is secured in place. 3. Tighten all seven (7) screws.
Page 32: Battery Disassembly
Battery Disassembly Battery Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery Establishing image.
Page 33 Battery Disassembly 1. Remove the two (2) screws that secure the battery in place. 2. Slowly pull the battery to disconnect the battery cable from system board, and remove the battery from the system board.
Page 34 The removal is complete. Battery Reassembly 1. Place the battery back into its original location. 2. Reconnect the battery cable.
Page 35 3. Tighten the two (2) screws to secure the battery in place. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 36 WLAN Card Disassembly WLAN Card Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery WLAN Card Establishing image.
Page 37 WLAN Card Disassembly 1. Remove the cable holder securing the antenna cables. 2. Disconnect the antenna cables from the WLAN card.
Page 38 3. Remove one screw securing the WLAN card. 4. Remove the WLAN card.
Page 39 The removal is complete. WLAN Card Reassembly 1. Place the WLAN card back into its original location. 2. Reconnect the antenna cable.
Page 40 3. Tighten the one (1) screw to secure the WLAN card in place. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 41 I/O Daughter Board Disassembly I/O Daughter Board Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery WLAN Card I/O Daughter Board Establishing image.
Page 42 I/O Daughter Board Disassembly 1. Carefully disconnect the Flex cable. 2. Remove the two (2) screws securing the I/O daughter board in place.
Page 43 3. Lift up and remove the I/O daughter board. The removal is complete.
Page 44 I/O Daughter Board Reassembly 1. Place the I/O daughter board back into its original location. 2. Reconnect the Flex cable. 3. Tighten the two (2) screws to secure the I/O daughter board in place. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2.
Page 45 System Board Disassembly System Board Disassembly Video PREREQUISITES Remove the following parts: Bottom cover Battery WLAN card System Board Establishing image.
Page 46 System Board Disassembly 1. Disconnect the 1) I/O cable, 2) touch pad, 3) keyboard, 4) speaker, 5) DC-in jack, and 6) eDP cables.
Page 47 2. Remove the nine screws. 3. Lift up and remove the system board.
Page 48 The removal is complete. NOTE: Please perform RMA Shim after the system board replacement. For more information, please Shim. NOTE: The RMA Shim USB key will be dispatched or bundled together with the replacement system board. The RMA Shim USB software on the USB key is the service-lite version, which will only contain the...
Page 49 Shop Floor and Google Required Test Module. After completing the break-ﬁx event, always return the RMA Shim USB key together with the faulty system board. System Board Reassembly 1. Place the system board back into its original location. 2. Reconnect all the cables. 3.
Page 50 Speakers Disassembly Speakers Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery Speakers Establishing image.
Page 51 Speakers Disassembly 1. Disconnect the keyboard, touchpad, and I/O cables. 2. Disconnect the speaker connector from the system board.
Page 52 3. Unthread the speaker cable and remove the speakers. The removal is complete.
Page 53 Speakers Reassembly 1. Place the speakers back into their original location. 2. Reconnect all the cables. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 54 DCIn Jack Disassembly DC-In Jack Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery DC-In Jack Establishing image.
Page 55 DCIn Jack Disassembly 1. Disconnect the DC-In jack connector from the system board. 2. Remove the screw securing the DC-In jack in place.
Page 56 3. Lift up the DC-In jack. The removal is complete.
Page 57 DCIn Jack Reassembly 1. Place the DC-In jack back into its original location. 2. Tighten the screw to secure the DC-in jack in place. 3. Reconnect all the cables. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3.
Page 58 LCD Assembly Disassembly LCD Assembly Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly Establishing image.
Page 59 LCD Assembly Disassembly 1. Disconnect the eDP and wireless cables. 2. Remove the four (4) screws.
Page 60 3. Lift up the two (2) hinges. 4. Lift up the palm rest and remove it.
Page 61 The removal is complete. LCD Assembly Reassembly 1. Place the LCD Assembly back into its original location on the palm rest. 2. Reconnect all the cables.
Page 62 3. Tighten the four (4) screws to the system base. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 63 LCD Bezel Disassembly LCD Bezel Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly LCD Bezel Establishing image.
Page 64 LCD Bezel Disassembly 1. Remove the two (2) mylar screw covers. NOTE: The screw cover on the LCD bezel is made up of a mylar sticker, and it can be hard to remove with just a normal plastic scribe. To remove this screw, simply use the regular Philips...
Page 65 driver and puncture the mylar cover. 2. Remove the two (2) screws. 3. Pry from the bottom and work your way up.
Page 66 4. Remove the bezel. The removal is complete.
Page 67 LCD Bezel Reassembly 1. Place the LCD Bezel back into its original location. 2. Tighten the two (2) screws to secure the bezel in place. 3. Replace the mylar screw covers.
Page 68 LCD Panel Disassembly LCD Panel Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly LCD Panel Establishing image.
Page 69 LCD Panel Disassembly 1. Remove the four (4) screws. 2. Lift the LCD up and rotate it 180 degrees.
Page 70 3. Remove the connector. 4. Remove the LCD.
Page 71 The removal is complete. LCD Panel Reassembly 1. Place the LCD Panel back into its original location and reconnect the connector. 2. Tighten the four (4) screws to secure the LCD panel in place.
Page 72 AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 73: Camera Disassembly
Camera Disassembly Camera Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly Camera Establishing image.
Page 74 Camera Disassembly 1. Pry the camera out from the sticky base. 2. Disconnect the camera cable and remove the camera.
Page 75: Camera Reassembly
The removal is complete. Camera Reassembly 1. Place the camera back into its original location. 2. Reconnect the connector.
Page 76 AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 77 Left/Right Hinge Disassembly Left/Right Hinge Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly LCD Bezel Left / Right Hinge Establishing image.
Page 78 Left/Right Hinge Disassembly 1. Remove the four (4) screws on each hinge (eight (8) screws in total).
Page 79 2. Remove the hinges.
Page 80 The removal is complete. Left/Right Hinge Reassembly 1. Place the left and right hinges back into their original location. 2. Tighten all eight (8) screws to secure the left and right hinges in place.
Page 82 eDP Cable Disassembly eDP Cable Disassembly Video PREREQUISITES Pre-removal parts: Bottom Cover Battery LCD Assembly LCD Bezel eDP Cable Establishing image.
Page 83 eDP Cable Disassembly Disconnect the eDP cable from the camera and unthread it to remove the eDP cable. The removal is complete.
Page 84 eDP Cable Reassembly 1. Reconnect the cable to the camera. 2. Place the eDP Cable back into its original location. AfterService Instructions 1. Reconnect the system to its electrical outlet. 2. Turn on the system and attached peripherals. 3. Let the system boot.
Page 85 Palmrest (Base) NOTE: The keyboard and touchpad are not separate removable parts; they are part of the palm rest assembly. PREREQUISITES Pre-removal parts: Bottom Cover Battery WLAN Card I/O Daughter Board System Board Speakers DC-In Jack LCD Assembly Palmrest (Base) Establishing image. Palmrest Reassembly...
Page 86 Replace the pre-removal parts in descending order.
Page 87 LCD Back Cover (Base) NOTE: The LCD back cover is the base for non-touch systems. For touch systems, there is a touch hinge LCD assembly available to be dispatched. PREREQUISITES Pre-removal parts: Bottom Cover Battery WLAN Card I/O Daughter Board System Board Speakers DC-In Jack LCD Assembly LCD Bezel...
Page 88 LCD Back Cover Reassembly Replace all the pre-removal parts in descending order.