MICROSOFT SURFACE LAPTOP 4 1958 (01) PDF Document

The service guide covers the following Microsoft Surface Laptop 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 model and serial number for the MICROSOFT SURFACE LAPTOP 4 1958 are located on the bottom center of the device, closest to the display hinge point.

The following terms are used when servicing the MICROSOFT SURFACE LAPTOP 4 1958:

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 standard service tools are recommended for the MICROSOFT SURFACE LAPTOP 4 1958:

Microsoft Recommended Service Jigs:

ESD-safe battery cover

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

Always observe the following general safety precautions when repairing your MICROSOFT SURFACE LAPTOP 4 1958:

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 service 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.

We recommend wearing protective eyewear and gloves when disassembling/re-assembling a device.

Before opening your MICROSOFT SURFACE LAPTOP 4 1958, follow these repair-specific precautions:

Ensure the device 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 the discharge process:

– Disconnect the charger from the device.

– Increase display brightness to the highest level.

– Turn on Wi-Fi and Bluetooth.

– Open the Camera app in Windows.

– Play music or video files from a local drive or streaming service.

Operate the device in this mode until the battery is fully discharged and the device powers off.

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

Wear protective eyewear as a safety precaution.

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

Before opening a device, always wear an anti-static wrist strap and confirm your work area is properly grounded to protect vulnerable electronics from electrostatic discharge (ESD).

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

If battery damage (e.g., leaking, expansion, folds) is discovered, DO NOT proceed. Refer to proper device disposition guidelines.

As you remove each subassembly, place it and its screws away from the work area to prevent damage.

Remove the rSSD (removable Solid-State Drive) whenever the C-cover is removed from the device for safety purposes.

Note that whenever the rSSD has been removed, powering on the device requires that the rSSD and C-cover are installed.

The MICROSOFT SURFACE LAPTOP 4 1958 contains a built-in, lithium-ion rechargeable battery. Use the following best practices when handling it:

Always fully discharge batteries by running an application such as video playback with the device unplugged. 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.

Don’t leave loose screws or small parts inside the device.

Avoid using 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).

Ensure you handle, recycle, and/or dispose of used or damaged batteries in accordance with local laws and regulations.

If device repair cannot be completed immediately and needs to be stored:

– Select a storage location and process that follows the battery safety precautions.

– Avoid exposing the device to environmental conditions and objects that could damage the battery pack.

– Reinspect the battery pack before restarting the repair and installing a new battery pack.

Upon opening your MICROSOFT SURFACE LAPTOP 4 1958, 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, resulting in heating, smoke, or fire. Act immediately if you see any of the following symptoms:

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

The battery pouch suddenly expands in size.

A popping or hissing noise from the battery or 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.

If your MICROSOFT SURFACE LAPTOP 4 1958 visually exhibits any of the following symptoms, cease all further repair efforts and report the issue to 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.

If these issues occur, you should be prepared to provide the following information:

The model and serial number of the affected device and/or accessory(ies).

A brief description of the damage found.

Clear photographs depicting the symptoms observed.

The following table lists the part numbers for the Non-Skid Feet compatible with various Surface Laptop models, including the MICROSOFT SURFACE LAPTOP 4 1958.

The following table lists the part numbers for the C-cover Keyboard Assembly (Metal or Fabric) compatible with various Surface Laptop models, including the MICROSOFT SURFACE LAPTOP 4 1958. C-cover screws are universally compatible across all listed models.

The following table lists the part numbers for the Removable Solid-State Drive (rSSD) compatible with various Surface Laptop models, including the MICROSOFT SURFACE LAPTOP 4 1958. The rSSD screw is universally compatible. NOTE: The replacement rSSD size must be the same as the original.

The following table lists the part numbers for the AB-cover Display Assembly compatible with various Surface Laptop models, including the MICROSOFT SURFACE LAPTOP 4 1958.

The following table explains the localization codes used for components on the MICROSOFT SURFACE LAPTOP 4 1958.

The following approach should be taken when troubleshooting hardware on your MICROSOFT SURFACE LAPTOP 4 1958:

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 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.

The battery on the MICROSOFT SURFACE LAPTOP 4 1958 bears a warning label with the following information:

Battery cannot be easily replaced by user

Risk of fire or burning – contact Microsoft for assistance

Do not separate or remove battery from backplate cover

Do not modify battery, its wiring, or connectors

Do not replace, short circuit, bend, crush, or puncture battery

Do not dispose of battery in fire or expose to high temperatures (+140°F/60°C)

To replace the non-skid foot pads, first ensure the device is powered off and placed on a clean, debris-free surface with the bottom facing up.

Procedure – Removal (Non-Skid Foot Pad)

1. Front foot removal – To remove front feet, insert the pointed end of a plastic Spudger tool from the long side of the device under the foot. There is a designed gap in the foot located at the center of the outside edge. Point the tool directly in the middle of the foot starting from the front edge and push in towards the middle of the device. Removal works best if the spudger is at a relatively low angle. Use plastic tweezers or a spudger to lift one edge of each foot. Grasp the loose end and pull the foot from the D-bucket.

2. Rear foot removal – To remove back feet, perform the same steps as for the front feet but from the back side of the device and along the long edge. Removal works best if the spudger is at a relatively low angle.

3. Adhesive removal – Remove any adhesive liners in the foot pockets. Use 70% IPA and cotton wipes to clean off any adhesive residue. Inspect the foot area carefully for any remaining liner, which may be clear and hard to see. Ensure the IPA is completely dried and no residue is left before applying new feet.

Procedure – Installation (Non-Skid Feet)

1. Prepare new front feet and press into place – Remove the protective sheet to expose the adhesive on the new front foot. 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. 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 – Inspect the feet to ensure no 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 the gap is larger, replace the foot.

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

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

6. Inspect for anomalies – Check for cosmetic damage or gaps. Use a feeler gauge if necessary, ensuring any gap is smaller than 0.05 mm.

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.

Yes, if clamps are not available, you can use an alternate manual pressure method to install the non-skid feet on your MICROSOFT SURFACE LAPTOP 4 1958.

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 – Placing the keyboard and foot between your thumb and index finger as shown, pinch the foot tightly with your thumb and hold for 20 seconds.

3. Inspect for anomalies – Inspect the feet after pinching to ensure no cosmetic damage or gaps between the foot and the chassis exist. If a gap exists, use a feeler gauge to verify it is smaller than 0.05 mm. If the gap 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 it in until it sits flat.

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

6. Inspect for anomalies – Inspect the feet for any cosmetic damage or gaps. Verify any gap is smaller than 0.05 mm.

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

IMPORTANT: It is recommended to let the device sit feet-down on a tabletop for at least 12 hours after installing new feet before transport.

Devices are built with either a fabric or metal type C-cover keyboard assembly. This procedure is for the metal type C-cover.

Prerequisite Steps:

– Power off the device and disconnect from power.

– Follow general safety and ESD compliance steps.

– Remove the four non-skid feet.

Procedure – Removal (Metal Type)

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

2. Separate C-cover from device – Turn the device over into its standard use position and open the display. Grab the C-cover edge closest to the display and slowly remove the C-cover at an angle. Do not pull the C-cover apart beyond 45 degrees to avoid FPC damage.

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

4. Disconnect FPCs – While hovering the C-cover, disconnect the FPC from the main board by pulling up on the metal head vertically. Place the C-cover in a safe place with the key/trackpad side down.

IMPORTANT: It is recommended to place an ESD-safe battery cover over the device to protect the battery from accidental damage. Remove the rSSD whenever the C-cover is removed for safety purposes.

Procedure – Installation (Metal Type)

1. Pre-installation Device Inspection – Verify the battery’s condition. Verify the LDI (Liquid Damage Indicator) inside the audio jack is white.

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

3. Install rSSD – Follow the rSSD installation procedure.

4. Connect C-cover FPC – Remove the shipping tape from the new C-cover FPC. Remove the battery cover from the device. Hover the C-cover over the device and connect the FPC to the main board by pressing the connection with your finger.

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) until fully fastened.

7. Run SDT – Run the Surface Diagnostic Toolkit to ensure all functions operate as expected.

8. Install Feet – If SDT tests pass, follow the procedure for installing the non-skid feet.

This procedure is for the fabric type C-cover keyboard assembly, which uses magnets and a hook latching system.

Prerequisite Steps:

– Power off the device and disconnect from power.

– Follow general safety and ESD compliance steps.

– Remove the four non-skid feet.

Procedure – Removal (Fabric Type)

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 to its standard use position and open the display. Place a suction cup in the bottom palm rest area, close to the edge. Do not place it on the trackpad. Hold down the corner hinge side of the cover with your thumb and pull up on the suction cup to separate the cover. Be careful to prevent the back edge from lifting.

3. Separate C-cover from device – Once separation is achieved, place a finger between the C-cover and device region. Pull upwards slightly to separate the C-cover from the magnets.

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

5. C-cover hook clearance – Once angled, keep the C-cover at that angle while pulling it directly towards yourself to clear the hook.

6. Disconnect FPCs – While hovering the C-cover, disconnect the FPC from the main board by pulling up on the metal head vertically.

IMPORTANT: Place an ESD-safe cover over the battery for protection. Remove the rSSD whenever the C-cover is removed for safety.

Procedure – Installation (Fabric Type)

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

2. Check for unexpected items – Inspect the C-cover and enclosure for foreign objects.

3. Install rSSD – Follow the rSSD installation procedure.

4. Connect C-cover FPC – Remove shipping tape from the new FPC. Remove the battery cover, hover the C-cover over the device, 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 top 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 install 4 new screws until just snug, then turn another 45 degrees (1/8 turn) until fully fastened.

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

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

To replace the rSSD, you must first remove the C-cover keyboard assembly.

Procedure – Removal (rSSD)

1. Remove rSSD Screw – Use a 5IP (Torx-Plus) driver to remove the screw securing the rSSD. Be very careful to position the screwdriver directly over the screw and avoid slipping towards the battery.

2. Remove rSSD – The rSSD should lift upwards to a ~15 degree tilt after the screw is removed. Carefully grab the sides of the rSSD case and pull it out of the main board socket at that same ~15 degree 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 for your device model and of like capacity should be used.

1. Insert rSSD – Insert the connector end of the rSSD into the SSD connector on the Mainboard at a ~15 degree angle.

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

3. Install C-cover – Follow the steps for installing the C-cover Keyboard Assembly.

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 to install the non-skid feet.

Replacing the AB-cover is an ESD-sensitive procedure and requires software tools for calibration.

Prerequisite Steps:

1. Enter Replacement Mode: Connect a USB drive with the software tools to the device. Connect the power supply.

2. Power On and run the software tool: `STEP1_DisplayModuleReplacement.cmd`. Accept the power down prompt once the tool is run. This step must be completed successfully before removing the old display.

3. Disassemble Device: Follow procedures to remove the feet, C-cover, and rSSD.

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 to prevent damage during shield removal.

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

3. Remove FPC RF Shield Cans – Using tweezers, remove the two shield lids by first peeling on the bottom right corners. To prevent FPC damage, peel up the shield along its front edge, bend it to 45 degrees, and carefully pull vertically while twisting to remove.

4. Disconnect FPCs – Once shields are removed, use a Spudger tool to disconnect the 4 FPCs by prying upwards on the corners first, then along the front edge. Gently pull each FPC ribbon towards the front 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 about a 90-degree angle. Then remove the remaining external screw at the left and right hinges while holding the display.

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

Installation process differs based on whether your device has a Metal or Fabric C-cover. Ensure you follow the correct procedure.

This procedure is for installing a new display assembly on a device with a Metal C-cover.

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 and install 2 new outer screws on each hinge (4 total). Install screws 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 later alignment.

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

4. Tuck FPCs – Use a guitar pick to carefully tuck the loose portion of the FPCs under the enclosure lip. Ensure the FPC is taut with no slack protruding.

5. Touch Calibration Steps – The new display must be calibrated.

a. Install the rSSD.

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

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device.

f. Run the software tool: `STEP2_DisplayModuleReplacement.cmd`. 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 2 new shield lids above the 4 FPCs. Ensure you install the correct shield on each side (left has 2 embosses, right has 3). Push the shields vertically downwards to 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 shield by peeling off the adhesive protector and snapping them into place. Press firmly to adhere.

9. AB-cover Hinge Alignment – 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. Verify alignment by inserting a 0.40mm plastic feeler gauge between the display and chassis; it should slide smoothly. Once aligned, secure by turning all 6 hinge screws another 90 degrees (1/4 turn).

10. Opening Strength Adjustment (Metal C-cover) – This requires replacing the closure steels on the C-cover itself.

a. On the C-cover, remove the mylars covering the closure steels.

b. Remove the old closure steels from the front edge pockets.

c. Clean the area with IPA.

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

e. Secure each steel by pressing firmly with the back of tweezers for 80 seconds.

f. Place new mylar tape over each steel, ensuring it is fully covered and flattened.

11. Fit C-cover and Final Assembly – Follow the remaining steps for C-cover and rSSD installation, run SDT to validate, and finally install the feet.

This procedure is for installing a new display assembly on a device with a Fabric C-cover.

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 and install 2 new outer screws on each hinge (4 total). Install screws 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 later alignment.

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

4. Tuck FPCs – Use a guitar pick to carefully tuck the loose portion of the FPCs under the enclosure lip. Ensure the FPC is taut with no slack protruding.

5. Touch Calibration Steps – The new display must be calibrated.

a. Install the rSSD.

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

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device.

f. Run the software tool: `STEP2_DisplayModuleReplacement.cmd`. 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 2 new shield lids above the 4 FPCs. Ensure you install the correct shield on each side (left has 2 embosses, right has 3). Push the shields vertically downwards to 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 shield by peeling off the adhesive protector and snapping them into place. Press firmly to adhere.

9. AB-cover Hinge Alignment – 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. Verify alignment by inserting a 0.40mm plastic feeler gauge between the display and chassis; it should slide smoothly. Once aligned, secure by turning all 6 hinge screws another 90 degrees (1/4 turn).

10. Fit C-cover and Final Assembly – Follow the final steps for C-cover and rSSD installation, run the SDT tool to validate the repair, and finally install the non-skid feet.

When an AB-cover Display Assembly is replaced on your MICROSOFT SURFACE LAPTOP 4 1958, a touch calibration routine is required.

USB Drive Setup – Directory Structure and Files

Copy the following files and folder to the root directory of a USB drive for easy access:

Folder: Project

File: STEP1_DisplayModuleReplacement.cmd

File: STEP2_DisplayModuleReplacement.cmd

Tool Runtime Details

The calibration tool runs within the Windows OS, so the device must be functional enough to boot into the OS. The tools perform two functions:

1. Set the device into AB-cover replacement mode (Servicing Mode).

2. Perform touch calibration on the new AB-cover.

The tools are run at specific points during the AB-cover replacement process. `STEP1` is run before removing the old display, and `STEP2` is run after installing the new display but before final reassembly.

Expected Tool Operation:

When `STEP1_DisplayModuleReplacement.cmd` is invoked:

– The tool will indicate it is entering Servicing Mode.

– The operator will be prompted to authorize device shutdown by entering ‘Y’.

– The tool confirms shutdown authorization and a Windows OS alert will appear before the device shuts down.

When `STEP2_DisplayModuleReplacement.cmd` is invoked:

– The tool will run preliminary sanity and shorts tests.

– It will prompt the operator that calibration is about to begin, with a reminder not to touch the screen or plug in power during the process.

– The tool reports calibration is in progress, followed by results (e.g., “Calibration completed successfully”).

– Finally, the tool initiates an OS restart to exit Servicing Mode.

If the touch calibration tool returns an error, it is necessary to retry the calibration process by installing a different new AB-cover.

Touch Calibration Steps (Retry):

1. Preparation:

a. Install the rSSD to enable device operation.

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

c. Connect the software tools USB drive and power supply.

d. Power on the device.

e. Run the software tool: `STEP1_DisplayModuleReplacement.cmd`. Accept the power down prompt.

2. Take the following steps:

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

b. Remove the temporary C-cover.

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

d. Remove the rSSD to ensure all power is removed from the device.

3. Remove AB-cover: Remove the new AB-cover that failed calibration and install another new AB-cover. The device must see a different AB-cover to accept new calibration data.

4. Repeat Preparation:

a. Re-install the rSSD.

b. Temporarily re-connect the C-cover.

c. Connect the USB drive and power supply.

d. Power on the device.

e. Run the software tool: `STEP2_DisplayModuleReplacement.cmd`. Verify touch is working.

5. Navigate to the USB key with software tools and run the SDT tool.

6. Run SDT: Within the SDT tool, choose Select Tests, 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.

All waste electrical and electronic equipment (WEEE), waste electronic components, waste batteries, and electronic waste residuals from your MICROSOFT SURFACE LAPTOP 4 1958 must be managed according to applicable laws and regulations and H09117, “Conformance Standards for Environmentally Sound Management of Waste Electrical and Electronic Equipment (WEEE).”