MICROSOFT SURFACE LAPTOP 4 1979 (01) PDF Document

The service guide for the MICROSOFT SURFACE LAPTOP 4 1979 covers the following Surface Laptop 3 and Laptop 4 models:

Surface Laptop 3 Models:

• 1867 – Surface Laptop 3 – 13.5″ (Fabric type keyboard)

• 1868 – Surface Laptop 3 – 13.5″ (Metal type keyboard)

• 1872 – Surface Laptop 3 – 15″ (Metal type keyboard)

• 1873 – Surface Laptop 3 – 15″ (Metal type keyboard)

Surface Laptop 4 Models:

• 1950 – Surface Laptop 4 – 13.5″ (Fabric type keyboard)

• 1951 – Surface Laptop 4 – 13.5″ (Metal type keyboard)

• 1953 – Surface Laptop 4 – 15″ (Metal type keyboard)

• 1958 – Surface Laptop 4 – 13.5″ (Fabric type keyboard)

• 1959 – Surface Laptop 4 – 13.5″ (Metal type keyboard)

• 1979 – Surface Laptop 4 – 15″ (Metal type keyboard)

The following terms are used throughout the manual for the MICROSOFT SURFACE LAPTOP 4 1979:

• ASP – a Microsoft Authorized Service Provider who performs repair services on behalf of Microsoft under an ASP Agreement.

• Commercial Spares/CRU – Customer Replaceable Units available to commercial customers for repair by a skilled-technician.

• feet or foot – Non-Skid Foot Pads.

• C-cover – Keyboard Trackpad Assembly.

• rSSD – Removable Solid-State Drive.

• AB-cover – Display Assembly or AB-Cover Display Assembly.

• BMR – Bare Metal Recovery refers to the clean imaging process.

• chassis or D-chassis or D-bucket – Device bottom case.

• SDT – Surface Diagnostic Toolkit.

• ESD – Electro-Static Discharge.

• FPC – Flexible Printed Circuits connections.

• FRU – Field Replaceable Units are sub-system components such as the C-cover, AB-cover, and rSSD. FRU are available only to ASPs. Some replaceable units will only be available as FRUs and therefore are only supported at an ASP.

• IPA – Isopropyl alcohol which should be used to clean adhesive from device as detailed within process steps. Use 70% IPA in all cases.

The following tools are recommended for servicing the MICROSOFT SURFACE LAPTOP 4 1979:

Microsoft Recommended Service Jigs:

• ESD-safe battery cover

Microsoft Provided Software Tools / References:

• Software Tool – AB-cover Touch Calibration tool

• How To: Update Surface device firmware and OS

• How To: Surface Tools Video

• Download: Surface drivers and firmware

• Download: Surface Diagnostic Toolkit (SDT)

• Download: Surface Data Eraser

• Download: Surface Imaging Tools

Standard Service Tools:

• Anti-static wrist strap (1 MOhm resistance)

• ESD-safe benchtop

• Surface Laptop Power Supply

• USB hub (3 ports required)

• USB keyboard (standard PC keyboard)

• USB mouse (standard PC mouse)

• Standard PC monitor with HDMI or DVI input

• Mini-DP port to HDMI/DVI dongle

• Spudger tool

• Clamps (2), 50.8mm (2 in) spring

• Torx plus drivers 3IP,5IP,6IP

• Isopropyl alcohol dispenser bottle (use 70% IPA)

• Cleaning swabs

• ESD-safe tweezers

• Guitar pick opening tool

• Heavy duty suction cups (2) – 57.15mm (2.25 in)

• Plastic feeler gauge – 0.40mm

• Plastic feeler gauge – 0.50mm

• Plastic feeler gauge – 0.050mm

When repairing your MICROSOFT SURFACE LAPTOP 4 1979, always observe the following general safety precautions:

• Opening and/or repairing any electronic device can present a risk of electric shock, fire, serious personal injury, death, damage to the device or other property, and/or other hazards. Exercise caution when undertaking repair activities.

• Improper use or handling of devices or their batteries may result in fire or explosion. Only open the enclosure on a device as outlined in the guide.

• Do not heat, puncture, mutilate, or dispose of devices or their batteries in fire. Do not leave or charge devices in direct sunlight or expose devices or their batteries to temperatures outside the recommended operating range of 0° C to 60° C / 32° F to 140° F for an extended period. Doing so can result in battery failure, electric shock, fire, serious personal injury, death, and/or damage to the device or other property.

• It is recommended to wear protective eyewear and gloves when disassembling/re-assembling a device.

Before and during repair of your MICROSOFT SURFACE LAPTOP 4 1979, follow these specific precautions:

• Before opening the device, ensure it is powered off and disconnected from its power source.

• For devices with rechargeable lithium-ion batteries that power on, fully discharge the battery before beginning repair. To expedite discharge, disconnect the charger, increase display brightness, turn on Wi-Fi and Bluetooth, open the Camera app, and play media files until the device powers off.

• Ensure your work surface is level, flat, and covered with an ESD-safe, soft, non-marring material.

• Wear protective eyewear and an anti-static wrist strap, and confirm your work area is properly grounded.

• Clean your work surface regularly to remove debris and abrasive particles.

• Store parts removed from a device in ESD-safe bags.

• If battery damage (leaking, expansion, etc.) is discovered, DO NOT proceed with the repair. Contact Microsoft for proper device disposition.

• Place each subassembly and its screws away from the work area to prevent damage.

• Before reassembling, check that no loose articles are on the back cover or inside the device.

• IMPORTANT: Remove the rSSD (removable Solid-State Drive) whenever the C-cover is removed. This disconnects the battery from all logical components for safety.

• IMPORTANT: To power on the device after the rSSD has been removed, both the rSSD and C-cover must be reinstalled.

The MICROSOFT SURFACE LAPTOP 4 1979 contains a built-in, lithium-ion rechargeable battery. Battery safety is a significant concern when repairing the device. Follow these procedures:

• Use only genuine Microsoft replacement parts. Use of non-Microsoft, incompatible, reused, or modified parts, improper installation, or improper handling or storage can cause battery overheating, expansion, venting, leaking, or a thermal event.

• Before beginning a repair, ensure your workspace is free of flammable debris or materials, has adequate ventilation, and you have a fire suppressant device (e.g., fire blanket, Class B fire extinguisher) within easy reach.

• Use personal protective equipment (PPE) when handling damaged, venting, or hot battery packs.

• Always fully discharge batteries by running an application such as video playback. If the device does not function while unplugged, you may leave out this step.

• Do not puncture, impact, strike, bend, or crush the battery or a device containing a battery.

• Keep your workspace clear of debris, extra tools, and sharp objects.

• Exercise caution when using sharp tools near the battery to avoid impacting or poking it.

• Avoid leaving loose screws or small parts inside the device.

• Do not use tools that conduct electricity.

• Do not drop or throw a lithium-ion battery.

• Do not expose the battery to excessive heat, sunlight, or temperatures outside the battery’s normal operating range (0°C to 60°C / 32°F to 140°F).

• If a device repair cannot be completed immediately, store the device and its used or damaged batteries temporarily by selecting a storage location that follows battery safety precautions and avoids exposing the device to conditions that could damage the battery pack.

Upon opening your MICROSOFT SURFACE LAPTOP 4 1979, you should visually inspect the battery for signs of damage. Factors to consider include, but are not limited to:

• Evidence of leaking or venting.

• Visible signs of physical or mechanical damage, such as:

• Expansion or swelling. In expanded or swollen batteries, the soft pouch encasing the cell pulls away from the inner material and appears baggy, loose, or puffy.

• Discoloration of the battery casing.

• Odor, smell, or visible corrosion. Leaked battery electrolyte smells like nail polish remover (acetone).

• Dents along the battery cell edges or on the top surface.

• Surface scratches that have exposed the aluminum beneath the black coating layer on the battery.

• Loose or damaged wires.

• Known misuse or abuse.

Any battery exhibiting these signs must be replaced.

A thermal event is a rapid chemical chain reaction inside a battery cell. Act immediately if you see any of the following symptoms of a battery thermal event with your MICROSOFT SURFACE LAPTOP 4 1979:

• Smoke, soot, sparks, or flame emitted by the battery or from the device.

• The battery pouch suddenly expands in size.

• A popping or hissing noise from the battery or the device.

Actions to take:

• DO NOT use water. Immediately smother the battery or device with clean, dry sand, a fire blanket, or an appropriate (Class B) fire extinguisher. If using sand, dump the sand all at once until the device is completely covered.

• Contact local fire authorities if further assistance is needed.

• Exit the work area and ventilate it until it is clear of smoke.

• Wait at least 2 hours before attempting to touch the device.

• Dispose of the damaged battery or device in accordance with local environmental or e-waste laws and guidelines.

WARNING: DO NOT SHIP DAMAGED OR DEFECTIVE BATTERIES ALONE OR INSIDE DEVICES. Damaged batteries and devices containing damaged batteries require special packaging and handling.

If your MICROSOFT SURFACE LAPTOP 4 1979 visually exhibits any of the following symptoms, cease all further repair efforts and contact Microsoft Surface Customer Support to report and obtain next steps:

• Any burned or melted components, traces, or plastic parts on the outside of the device, or which otherwise exhibits heat damage, including charring seen in charging and other ports.

• Any burned or melted components, traces, or plastic parts on the inside of the device, or which otherwise exhibits heat damage.

• Any accessories exhibiting melting or heat damage that are included with the device, such as power supplies, keyboards, mice, cables, charging connectors, etc.

• Any devices that exhibit a case that has separated apart or opened for reasons other than impact damage from dropping, evidence of tampering, or separation caused by a malfunctioning battery.

• Any other finding that may constitute a safety hazard to the user, such as sharp edges on plastics.

The following approach should be taken when troubleshooting hardware on the MICROSOFT SURFACE LAPTOP 4 1979:

1. Update the device to the latest OS/FW versions using the Surface Diagnostic Toolkit (SDT). Device updates are required as a prerequisite to all hardware repairs.

2. Verify any suspected hardware failures by setting the device in a known OS/FW version state and running SDT to verify the fault:

a. Replace the device’s internal rSSD with a BMR (Bare Metal Recovery) imaged rSSD containing the latest OS and FW updates (this must be created as a fault verification tool).

b. Run SDT and verify if the condition persists or if it is resolved with the use of the BMR imaged drive.

i. If the problem is resolved, then re-image the original rSSD or replace the original rSSD and image it.

ii. If the problem persists, then replace the suspected hardware FRU related to the problem by following the detailed replacement procedures.

3. SDT must be run following all hardware repairs where a FRU was replaced to further verify that the problem was resolved by the repair action taken.

Prerequisite Steps:

• Power off the device and disconnect it from a power supply.

• Ensure general safety and ESD compliance steps are followed.

• Flip the device over onto a clean, debris-free surface with the bottom facing up.

Procedure – Removal (Non-Skid Foot Pad):

1. Front foot removal: Insert the pointed end of a plastic Spudger tool into the designed gap at the center of the outside edge of the front foot. Point the tool towards the middle of the foot and push in. The spudger should be at a relatively low angle to the tabletop. Use plastic tweezers or the spudger to lift one edge of the foot, then grasp the loose end and pull the foot from the bottom case (D-bucket).

2. Rear foot removal: Perform the same steps as for the front feet but from the back side of the device along the long edge.

3. Adhesive removal: Remove any adhesive liners in the foot pockets. Use 70% Isopropyl Alcohol (IPA) and cotton wipes to clean off any adhesive residue. Inspect the area carefully to ensure no clear liner remains. Ensure the IPA is completely dry before applying new feet.

Procedure – Installation (Non-Skid Feet):

IMPORTANT: Any other required repairs should be done before installing new feet. Do not reuse old feet.

1. Prepare new front feet: Remove the protective sheet to expose the adhesive. Align the 3 posts on the foot with their respective pockets on the bottom of the unit and hand press the foot in until it sits flat. Repeat for the other front foot.

2. Clamp replaced feet: Align and center the press head of a clamp onto the front feet. Clamp both front feet for 4 minutes.

3. Inspect for anomalies: Check for cosmetic damage or gaps between the feet and the D-bucket. If a gap exists, use a feeler gauge to verify it is smaller than 0.05 mm. If it is larger, replace the foot.

4. Prepare new back feet: Remove the protective sheet to expose the adhesive. Insert the foot into the pocket on the bottom side of the unit and hand press until it sits flat.

5. Clamp replaced feet: Align and center the press head of a clamp onto the rear feet. Clamp both rear feet for 4 minutes.

6. Inspect for anomalies: Check for gaps. If a gap exists, use a feeler gauge to verify it is smaller than 0.05 mm. If larger, replace the foot.

7. Run SDT: Run the Surface Diagnostic Toolkit to ensure all device features operate as expected.

IMPORTANT: After installation, it is recommended to let the device sit feet-down on a tabletop for at least 12 hours before transporting it.

Yes, here is an alternate installation procedure for the Non-Skid Feet on your MICROSOFT SURFACE LAPTOP 4 1979 that uses manual pressure instead of clamps.

1. Prepare new front feet and press into place: To reassemble the front foot, remove the protective sheet to expose the adhesive. Align the 3 posts with their respective pockets on the bottom side of the unit and hand press the foot in until it sits flat. Repeat for the other front foot.

2. Pinch replaced feet: Place the keyboard and foot between your thumb and index finger as shown in the manual’s illustration, pinch the foot tightly with your thumb, and hold for 20 seconds.

3. Inspect for anomalies: After pinching, inspect the feet to ensure there is no cosmetic damage or gaps between the foot and the chassis. If a gap exists, use a feeler gauge to verify it is smaller than 0.05 mm. If it is larger, replace the foot.

4. Prepare new back feet and press into place: To reassemble the back feet, remove the protective sheet to expose the adhesive. Insert the foot into the pocket on the bottom side of the unit and hand press the foot in until it sits flat.

5. Pinch replaced feet: Place the keyboard and foot between your thumb and index finger, pinch the foot tightly, and hold for 20 seconds.

6. Inspect for anomalies: Check for any gaps between the feet and the D-bucket. If a gap exists and is larger than 0.05 mm, replace the foot.

7. Run SDT: Run the Surface Diagnostic Toolkit to ensure all device features and functions operate as expected.

IMPORTANT: Before transporting the device, it is recommended to let it sit feet-down on a tabletop for at least 12 hours after installing new feet.

Prerequisite Steps:

• Power off the device and disconnect from power.

• Follow general safety and ESD precautions.

• Remove the non-skid feet.

• Ensure all foot adhesive remains are removed from the foot sockets to avoid stripping the C-cover screws.

Procedure – Removal (Metal C-cover):

1. Remove C-cover screws: Using a 5IP (Torx plus) driver, uninstall 1 screw from each of the four foot sockets. CAUTION: Ensure the driver is seated correctly to avoid stripping the screw heads.

2. Separate C-cover: Turn the device over and open the display. Grab the C-cover edge closest to the display and slowly remove the C-cover at an angle. The C-cover is secured by magnets in addition to the screws. CAUTION: Do not pull the C-cover apart beyond a 45-degree angle to avoid damaging the FPC cable.

3. Position for FPC removal: After lifting the C-cover from the magnets, angle and hover it so the antenna side faces down towards the device, making the C-cover FPC accessible.

4. Disconnect FPC: While hovering the C-cover, disconnect the FPC from the main board by pulling up on the metal head vertically. Place the C-cover key-side down on a protected surface.

5. Protect Battery: It is recommended to place an ESD-safe battery cover over the battery to protect it from accidental damage.

6. Remove rSSD: Remove the rSSD to disconnect the battery from all logical components for safety.

Procedure – Installation (Metal C-cover):

1. Pre-installation Inspection: Verify the battery’s condition and check the Liquid Damage Indicator (LDI) inside the audio jack. If issues are found, the whole unit may need replacement.

2. Check for foreign objects: Inspect the C-cover and device enclosure for any loose articles, especially around the magnets and battery.

3. Install rSSD: Re-install the rSSD.

4. Connect C-cover FPC: Remove any shipping tape from the new C-cover’s FPC. Remove the battery cover. Hover the C-cover over the device and press the FPC connector onto the main board. CAUTION: Ensure the FPC bends properly without creating new folds or creases.

5. Align the C-cover: Properly align the cover using the front edge alignment posts. Carefully place the C-cover back onto the unit and shift until it snaps into place.

6. Install C-cover Screws: Close the display. Turn the unit over and use a 5IP screwdriver to install 4 new screws. Install screws until just snug, then turn another 45 degrees (1/8 turn) or until fully fastened.

7. Run SDT: Run the Surface Diagnostic Toolkit to ensure full functionality.

8. Install Feet: If all tests pass, install the non-skid feet.

Prerequisite Steps:

• Power off the device and disconnect from power.

• Follow general safety and ESD precautions.

• Remove the non-skid feet.

• Ensure all foot adhesive remains are removed from the foot sockets.

Procedure – Removal (Fabric C-cover):

1. Remove C-cover screws: Using a 5IP (Torx plus) driver, uninstall 1 screw from each of the four foot sockets.

2. Apply suction cups: Turn the device over and open the display. Place a suction cup in the bottom palm rest area, close to the edge. CAUTION: Do not place the suction cup on the Trackpad. Do not wet the suction cup.

3. Separate C-cover: Place your thumb on the corner hinge side of the cover to hold it down. Pull up on the suction cup to separate the C-cover from the bottom case. Once separation is achieved, place a finger between the C-cover and device and pull upwards slightly to separate it from the magnets.

4. Angle C-cover: Angle the C-cover to approximately 45 degrees from horizontal. Do not exceed 45 degrees to avoid damaging the C-cover hook or FPC.

5. C-cover hook clearance: While maintaining the angle, pull the C-cover directly towards yourself to clear the hook mechanism.

6. Disconnect FPC: While hovering the C-cover, disconnect the FPC from the main board. Place the C-cover key-side down on a protected surface.

7. Protect Battery and Remove rSSD: Place an ESD-safe cover over the battery and remove the rSSD for safety.

Procedure – Installation (Fabric C-cover):

1. Pre-installation Inspection: Verify battery condition and check the LDI in the audio jack.

2. Check for foreign objects: Inspect the C-cover and device for any loose articles.

3. Install rSSD: Re-install the rSSD.

4. Connect C-cover FPC: Remove shipping tape from the new FPC. Remove the battery cover. Hover the C-cover and connect the FPC to the main board.

5. Align the C-cover: Properly align the cover using the front edge alignment posts. Carefully place the C-cover back onto the unit and shift until it snaps into place. The top C-cover area under the display will protrude slightly. Press firmly on this area until you hear a click and the C-cover flattens out.

6. Install C-cover Screws: Close the display. Turn the unit over and use a 5IP screwdriver to install 4 new screws. Install until snug, then turn another 45 degrees.

7. Run SDT: Run the Surface Diagnostic Toolkit to verify functionality.

8. Install Feet: If tests pass, install the non-skid feet.

Prerequisite Steps:

• Power off the device.

• Follow all general safety and ESD precautions.

• Remove the non-skid feet.

• Remove the C-cover (keyboard assembly).

Procedure – Removal (rSSD):

1. Remove rSSD Screw: Use a 5IP (Torx-Plus) driver to remove the single screw securing the rSSD. WARNING: Be very careful to position your screwdriver directly over the screw and avoid slipping towards the battery. If the battery is contacted or damaged, cease activities immediately.

2. Remove rSSD: After the screw is removed, the rSSD should lift upwards to an approximate 15-degree tilt. Carefully grab the sides of the rSSD case and pull it out of the main board socket at that same angle.

IMPORTANT: After removal, confirm the condition of the thermal pillow beneath the rSSD. It should not show deterioration like collapsing or cracking.

Procedure – Installation (rSSD):

IMPORTANT: Only a Microsoft rSSD with the part number specified in the parts list, for the correct device model, and of like capacity should be used for replacement.

1. Insert rSSD: Insert the connector end of the rSSD into the SSD connector on the mainboard at an approximate 15-degree angle.

2. Install new rSSD screw: Use a 5IP screwdriver to install a new rSSD screw. Tighten until the screw is just snug and seated, then turn it another 45 degrees (1/8 turn) or until it is fully fastened.

3. Install C-cover: Follow the steps for C-cover Keyboard Assembly installation.

4. Imaging new rSSD: Power on the device. Apply a new image to the rSSD using a BMR Imaging key specific to the device model.

5. Run SDT: Run the Surface Diagnostic Toolkit to ensure all device features and functions operate as expected.

6. Install Feet: If SDT tests pass, follow the steps for installing the non-skid feet.

Replacing the AB-cover (Display Assembly) requires software tools and specific steps for calibration. The installation process varies slightly depending on whether your device has a Metal or Fabric C-cover.

Prerequisite Steps (Before Disassembly):

1. Enter AB-cover Replacement Mode: This step pulls calibration data from the old AB-Cover. Connect a USB drive with the software tools to the device.

2. Connect the power supply to the device.

3. Power on the device.

4. At the device OS, use Windows Explorer to navigate to the USB drive and run: `STEP1_DisplayModuleReplacement.cmd`. Accept the power down prompt once the tool is run. This step must be completed successfully before replacing the display.

5. Disassemble Device: Follow general safety precautions, then remove the feet, C-cover, and rSSD according to their specific procedures.

Removal Process (AB-cover Display Assembly):

1. Disconnect Antenna Cable: Using angled tweezers, disassemble the left antenna cable located to the left of the left AB-cover FPC RF shield.

2. Remove FPC RF Baffles: Using tweezers, remove the left and right baffles on top of the RF shield cans by prying them upwards.

3. Remove FPC RF Shield Cans: Using tweezers, remove the two shield lids. Peel up from the bottom right corners, then peel up the shield along its front edge and bend it to 45 degrees. Carefully pull vertically and twist left and right to remove the shield. This prevents damage to the FPCs.

4. Disconnect FPCs: Use a Spudger tool to disconnect the 4 FPCs by prying upwards on the corners and then along the front edge. Gently pull each FPC ribbon towards the front of the device to untuck it from the chassis ledge.

5. Remove Two Inner Hinge Screws: Using a 6IP screwdriver, remove the inner 2 screws on the left and right hinges.

6. Set Display Angle: Place the display module at an angle of about 90 degrees. Then, while holding the display, remove the remaining external screw at the left and right hinges.

7. Remove AB-cover: Lift the display module straight up vertically until it is detached from the unit.

(Installation procedures vary by C-cover type and are detailed in separate instructions).

Procedure installation – (Metal C-cover Device)

1. Initial AB-cover Install: Clean any residual thread locker from the hinge screw holes. Set the new AB-cover in place in the chassis hinge wells. Install 2 new outer screws on each hinge (4 total), tightening until just snug, then turn another 90 degrees (1/4 turn).

2. Release Hinge Clamp Force: Turn all 4 screws 90 degrees (1/4 turn) counterclockwise to release clamp force for alignment.

3. Connect AB-cover FPCs: Connect all 4 display module FPCs into their connectors.

4. Tuck FPCs: Use a guitar pick opening tool to carefully tuck the loose portion of the FPCs under the enclosure lip, ensuring the FPC is taut.

5. Touch Calibration Steps:

a. Install the rSSD.

b. Temporarily connect the C-cover FPC and set the C-cover in place without screws.

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device using the C-cover power button.

f. Run `STEP2_DisplayModuleReplacement.cmd` from the USB drive. Follow prompts; the device will restart. Verify touch functionality.

g. Power off the device, then remove the C-cover and rSSD.

6. FPC RF Shield Installation: Install the 2 new shield lids over the FPC connectors. The left-hand shield has 2 rectangular embosses; the right-hand shield has 3. Push them vertically downwards until they snap into place.

7. Connect WiFi Antenna: Reconnect the left WiFi antenna cable.

8. RF Baffle Installation: Install 2 new RF baffles on top of the shields by peeling off the adhesive protector and snapping them into place. Press firmly along the top to adhere.

9. AB-cover Hinge Alignment:

a. Set the display to 90 degrees. Shift the innermost screw on each side so the screws are concentric with the circular feature on the hinge.

b. Verify alignment by inserting a plastic 0.40mm feeler gauge between the display and chassis. If it doesn’t slide smoothly, re-align.

c. Secure the hinge by turning all 6 hinge screws another 90 degrees (1/4 turn) or until fully fastened.

10. Opening Strength Adjustment (Metal C-cover):

a. Remove the mylar tapes covering the closure steels on the C-cover.

b. Remove the old closure steels from the front edge pockets of the C-cover.

c. Clean the closure steel area with IPA.

d. Install the new provided closure steels about 2mm from the outside edge of the C-cover in each pocket.

e. Press firmly along the surface of each new steel for 80 seconds.

f. Place new mylar tape over each steel, ensuring it fully covers the steel and overlaps onto the C-cover. Smooth the tape with a Spudger tool.

11. Final Assembly:

a. Fit the C-cover (without screws). Check AB-cover alignment for flushness. Adjust hinge screws if not flush.

b. Install the rSSD.

c. Install the C-cover with its 4 screws.

d. Run SDT to validate full functionality.

e. Install the feet.

Procedure installation – (Fabric C-cover Device)

1. Initial AB-cover Install: Clean any residual thread locker from the hinge screw holes. Set the new AB-cover in place in the chassis hinge wells. Install 2 new outer screws on each hinge (4 total), tightening until just snug, then turn another 90 degrees (1/4 turn).

2. Release Hinge Clamp Force: Turn all 4 screws 90 degrees (1/4 turn) counterclockwise to release clamp force for alignment.

3. Connect AB-cover FPCs: Connect all 4 display module FPCs into their connectors.

4. Tuck FPCs: Use a guitar pick opening tool to carefully tuck the loose portion of the FPCs under the enclosure lip, ensuring the FPC is taut.

5. Touch Calibration Steps:

a. Install the rSSD.

b. Temporarily connect the C-cover FPC and set the C-cover in place without screws.

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device using the C-cover power button.

f. Run `STEP2_DisplayModuleReplacement.cmd` from the USB drive. Follow prompts; the device will restart. Verify touch functionality.

g. Power off the device, then remove the C-cover and rSSD.

6. FPC RF Shield Installation: Install the 2 new shield lids over the FPC connectors. The left-hand shield has 2 rectangular embosses; the right-hand shield has 3. Push them vertically downwards until they snap into place.

7. Connect WiFi Antenna: Reconnect the left WiFi antenna cable.

8. RF Baffle Installation: Install 2 new RF baffles on top of the shields by peeling off the adhesive protector and snapping them into place. Press firmly along the top to adhere.

9. AB-cover Hinge Alignment:

a. Set the display to 90 degrees. Shift the innermost screw on each side so the screws are concentric with the circular feature on the hinge.

b. Verify alignment by inserting a plastic 0.40mm feeler gauge between the display and chassis. If it doesn’t slide smoothly, re-align.

c. Secure the hinge by turning all 6 hinge screws another 90 degrees (1/4 turn) or until fully fastened.

10. Final Assembly:

a. Fit the C-cover (without screws). Check AB-cover alignment across the rear corners of each hinge. Adjust hinge screws if not flush.

b. Install the rSSD.

c. Install the C-cover (Fabric type) with its 4 screws.

d. Run SDT to validate full functionality.

e. Install the feet.

The touch calibration routine is required when replacing the AB-cover Display Assembly on your MICROSOFT SURFACE LAPTOP 4 1979.

USB Drive Setup:

Copy the provided tools to the root directory of a USB drive. The following files and folder are required in the same directory:

• Folder: Project

• File: STEP1_DisplayModuleReplacement.cmd

• File: STEP2_DisplayModuleReplacement.cmd

Tool Runtime Details:

• The tool runs within the Windows OS, so the device must be functional enough to boot into Windows.

• You may need login credentials for secured Windows accounts.

• The tool performs two main functions:

1. Sets the device into AB-cover replacement mode (this saves calibration data from the old display).

2. Performs touch calibration on the new, replaced AB-cover.

• The tools are run at specific points during the AB-cover Display Assembly Replacement Process.

Expected On-Screen Prompts:

• When `STEP1_DisplayModuleReplacement.cmd` is invoked:

• Screen 1: Shows “Invoking UAC for Privilege Escalation”.

• Screen 2: Shows “Successfully entered into Servicing Mode” and prompts “Shutdown now? (Y/N):”. You should enter Y.

• Screen 3: Confirms shutdown authorization with a countdown “Power Off in 10 seconds…”.

• Screen 4: A Windows OS alert appears: “You’re about to be signed out”. The device will shut down.

• When `STEP2_DisplayModuleReplacement.cmd` is invoked (after installing the new display):

• Screen 1: Shows “Privilege Escalation”.

• Screen 2: Preliminary device testing begins (“Begin sanity tests”).

• Screen 3: A prompt appears: “Calibration about to begin: DO NOT TOUCH THE SCREEN OR USE PEN – DO NOT PLUG IN POWER” followed by a countdown.

• Screen 4 & 5: Reports that the calibration routine is in progress and then shows the results (“Calibration completed successfully”).

• Screen 6: The tool initiates an OS restart with a countdown and a Windows alert appears: “You’re about to be signed out”.

If the tool shows an error screen (“ERROR, Calibration verification failed”), you must follow the retry procedure.

If the touch calibration fails after replacing the AB-cover on your MICROSOFT SURFACE LAPTOP 4 1979, it is necessary to perform the following retry steps:

1. Preparation:

a. Ensure an rSSD is installed to enable device operation.

b. Temporarily connect the C-cover FPC and set the C-cover in place on the device chassis (no screws needed).

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device.

f. Run `STEP1_DisplayModuleReplacement.cmd` from the USB drive and accept the power down prompt.

2. Disassembly for Retry:

a. Ensure the device is powered off and disconnected from the power supply.

b. Remove the C-cover that was temporarily installed.

c. Place an ESD-safe battery cover over the battery for protection.

d. Remove the rSSD. This ensures all power is removed from the device.

3. Replace the AB-cover Again:

a. Remove the new AB-cover that failed calibration. The device must see a different, new AB-cover to accept new touch calibration data.

b. Install another new AB-cover into the device.

IMPORTANT: This step is required to re-enable touch calibration.

4. Final Calibration Attempt:

a. Install the rSSD.

b. Temporarily connect the C-cover FPC and set the C-cover in place.

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device.

f. Run `STEP2_DisplayModuleReplacement.cmd` from the USB drive. Follow prompts. Verify touch is working after restart.

5. Final Verification with SDT:

a. Navigate to the USB key and run the Surface Diagnostic Toolkit (SDT) tool.

b. Within the SDT tool, choose Select Tests, then Touch Display Repair, and initiate by clicking on Run Selected button. Follow the instructions provided by the tool.

IMPORTANT: If the calibration tool continues to return an error message that indicates calibration failure, the device should be processed as an exchange and sent back to Microsoft for repair.

IMPORTANT: Service part availability is segmented into two groups. FRUs are parts available for repair activity through an Authorized Service Provider under specific contract with Microsoft. CRUs/Spares are parts available for repair activity by a skilled technician.

Item (1) Non-Skid Feet

Item (2) C-cover Keyboard Assembly (Metal or Fabric)

Note: This is a partial list. For the complete list of regional keyboards, please consult the service guide. An ‘X’ indicates compatibility.

Item (3) Removable Solid-State Drive (rSSD)

NOTE: rSSD size must be the same as the original.

Item (4) AB-cover Display Assembly

Component Localization Codes