MICROSOFT SURFACE LAPTOP 4 1950 (01) PDF Document

The Surface Laptop models covered in this guide are as follows:

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)

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 service manual:

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.

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

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 the repair activities described in this Guide. The repair activities identified in this Guide should only be undertaken by technically inclined individuals with the knowledge, experience, and specialized tools required to repair Microsoft devices.

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 this 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.

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

Before beginning any repair, follow these precautions:

WARNING: Before opening a device, ensure it is powered off and disconnected from its power source. Disconnect the device charger or power cord from mains power.

For devices with rechargeable lithium-ion batteries that power on, fully discharge the battery before beginning repair. To expedite the battery 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 ESD-safe, soft, non-marring material.

We recommend wearing protective eyewear as a safety precaution when disassembling/re-assembling a device.

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).

Parts removed from a device during the repair process should be stored in ESD-safe bags and packaged for return or recycling in the same packaging that the new replacement part came in.

If battery damage (e.g., leaking, expansion, folds or other) is discovered during device repair or if the battery is impacted or damaged during replacement, DO NOT proceed. Contact Microsoft directly for proper device disposition.

As you remove each subassembly from the device, place the subassembly (and all accompanying screws) away from the work area to prevent damage to the device or to the subassembly.

During all activities (excluding feet-only replacement) check to ensure that no loose articles are on the back cover or remain inside the device before reassembling it.

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

IMPORTANT: Whenever the rSSD has been removed, powering on the device requires that the rSSD and C-cover are installed.

This device contains a built-in, lithium-ion rechargeable battery. Battery safety is a significant concern when repairing a device. Use the following best practices when handling batteries:

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 the battery.

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 the device needs to be stored temporarily before restarting the repair:

Select a storage location and process that follows the battery safety precautions in this Guide.

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

Reinspect the battery pack as outlined in this Guide prior to restarting repair and installing the new battery pack.

Upon device opening, we recommend that you visually inspect the battery for signs of damage. Factors to consider when inspecting the battery 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.

Handling Used, Damaged, or Defective Lithium-Ion Batteries:

DO NOT dispose of used lithium-ion batteries, whether damaged or not, in household or commercial garbage or recycling bins.

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

Follow all instructions provided by your local e-waste recycling or household hazardous waste collection provider.

Place the device or battery in an individual, non-metallic inner packaging, such as a zip-to-close plastic bag, that completely encloses the device or battery.

Surround the inner packaging with non-combustible, electrically non-conductive, absorbent cushioning material.

Each damaged battery or device containing a damaged battery should be packed individually in its own carton and that carton should be clearly marked as containing a damaged battery.

A thermal event is a rapid chemical chain reaction that can occur inside a battery cell. Act immediately if you see any of the following symptoms:

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

The battery pouch suddenly expands in size.

A popping or hissing noise from the battery or a device containing a battery.

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 1950 visually exhibits any of the following symptoms, cease all further repair efforts and contact Microsoft Surface Customer Support:

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 Microsoft 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.

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.

(1) Non-Skid Feet

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

(3) Removable Solid-State Drive (NOTE: rSSD size must be same as original)

(4) AB-cover Display Assembly

Component Localization Codes

The following approach should be taken when troubleshooting Surface devices:

1. Update device to latest OS/FW versions using the SDT tool. 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 fault:

a. Replace the device’s internal rSSD with a BMR imaged rSSD containing latest OS and FW updates (not supplied – must be created as a fault verification jig/tool).

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

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

ii. If problem persists then replace suspected hardware FRU related to the problem by following the detailed replacement procedures covered within this service manual.

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

The battery bears the following warning label. Please heed the information provided on the label.

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)

Required Tools and Components:

Tools:

Plastic tweezers / spudger

Isopropyl Alcohol Dispenser Bottle (use only 70% IPA)

Cleaning swabs

Clamps (2), 2″ Irwin spring or 4.5″ Fastpro

Plastic feeler gauge – 0.050mm

Components:

Feet (Refer to Illustrated Service Parts List)

Prerequisite Steps:

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

General Safety – Check to make sure that general guidelines and ESD compliance steps are followed prior to opening the device.

Position device – To prevent scratches, flip device over onto a clean surface free of debris with the device bottom facing up for access to the feet for removal.

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 of the foot. Point the plastic 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 relative to the tabletop. Use plastic tweezers / 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 relative to the tabletop.

3. Adhesive removal – Remove any adhesive liners in the foot pockets. Use IPA and cotton wipes to clean off any adhesive residue within the foot pocket. Inspect the foot area carefully for any adhesive liner that may have remained. Ensure the IPA is completely dried off device and that no adhesive residue is left before applying new feet to avoid the risk of insufficient adhesion of the new feet.

Procedure – Installation (Non-Skid Feet)

IMPORTANT: Any further repairs that are required on the device should be carried out prior to feet installation. Do not reuse feet previously removed from a device.

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

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

3. Inspect for anomalies – Inspect feet to ensure no cosmetic damage or gaps between the feet and the D-bucket exist. If a gap exists, use a feeler gauge to verify the gap 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 protective sheet to expose adhesive on foot. Insert the foot into the pocket on the bottom side of the unit and hand press the foot in until the foot 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 – Inspect feet to ensure no cosmetic damage or gaps between the feet and the D-bucket exist. If a gap exists, use a feeler gauge to verify the gap is smaller than 0.05 mm. If the gap is larger, replace the foot.

7. Run SDT – Run SDT to ensure all device features and functions operate as expected.

IMPORTANT: Before transporting the device, we recommend letting it sit feet-down on a tabletop for at least 12 hours. If this isn’t possible, it’s recommended to avoid placing the device in a backpack, purse, other types of carriers, until at least 12 hours after installing new feet.

Yes, if clamps are not available, you can use a pinching method. Any further repairs should be carried out prior to feet installation. Do not reuse feet previously removed from a device.

1. Prepare new front feet and press into place – To reassemble front foot, remove protective sheet to expose adhesive on foot. Align the 3 posts with their respective pockets on the bottom side of the unit and hand press the foot in until the foot sits flat. Complete previous steps 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 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 the gap 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 protective sheet to expose adhesive on foot. Insert the foot into the pocket on the bottom side of the unit and hand press the foot in until the foot sits flat.

5. 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.

6. Inspect for anomalies – Inspect feet to ensure no cosmetic damage or gaps between the feet and the D-bucket exist. If a gap exists, use a feeler gauge to verify the gap is smaller than 0.05 mm. If the gap is larger, replace the foot.

7. Run SDT – Run SDT to ensure all device features and functions operate as expected.

IMPORTANT: Before transporting the device, we recommend letting it sit feet-down on a tabletop for at least 12 hours. If this isn’t possible, it’s recommended to avoid placing the device in a backpack, purse, other types of carriers, until at least 12 hours after installing new feet.

Procedure – Removal (C-cover Keyboard Metal Type)

1. Remove C-cover screws – After removing the non-skid feet, use a 5IP (Torx plus) driver to uninstall 1 screw from each of the four foot sockets.

CAUTION: Ensure the driver is seated correctly to avoid stripping the screw heads. Ensure all (4) screws are removed before proceeding.

2. Separate C-cover from device – Turn the device over and open the display. Grab the C-cover edge closest to the display and slowly lift the C-cover at an angle. The C-cover is secured by magnets.

CAUTION: Do not pull the C-cover apart beyond 45 degrees, as damage to the C-cover FPC could occur.

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

4. Disconnect FPCs – While hovering the C-cover, disconnect the FPC from the main board by pulling up on the metal head vertically with a fingernail or spudger.

IMPORTANT: Place the removed C-cover in a safe place with the key and trackpad side down to protect it and the FPC. It is recommended to place an ESD-safe battery cover over the device’s exposed battery.

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

Procedure – Installation (C-cover Keyboard Metal type)

1. Pre-installation Device Inspection – Verify the battery’s condition. Also, check the Liquid Damage Indicator (LDI) inside the audio jack. Any color other than white indicates liquid damage.

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

3. Install rSSD – Re-install the rSSD.

4. Remove tape – Remove the shipping tape from the new C-cover FPC.

5. Connect C-cover FPC – Remove the protective battery cover. Hover the C-cover over the device and press the FPC connector onto the main board.

6. 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.

CAUTION: Ensure the C-cover is correctly aligned before closing the display to avoid damage.

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

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

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

Procedure – Removal (C-cover Keyboard Fabric Type Keyboard)

1. Remove C-cover screws – After removing the non-skid feet, use a 5IP (Torx plus) driver to uninstall 1 screw from each of the four foot sockets.

CAUTION: Fabric C-covers utilize magnets and a hook latching onto the chassis, unlike metal C-covers.

2. Apply suction cups – Turn the device over and open the display. Place a suction cup in the bottom palm rest area, as close to the edge as possible. Do not place it on the trackpad. Do not wet the suction cup.

3. Separate C-cover from device – While holding down the corner hinge side of the cover with your thumb, pull up on the suction cup. Once separation is achieved, place a finger between the C-cover and the device and pull upwards slightly to separate it 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 angle and pull the C-cover 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 the removed C-cover in a safe place with the key and trackpad side down. It is recommended to place an ESD-safe battery cover over the device’s exposed battery. Remove the rSSD for safety.

Procedure – Installation (C-cover Keyboard Fabric type)

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

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

3. Install rSSD – Re-install the rSSD.

4. Remove tape – Remove the shipping tape from the new C-cover FPC.

5. Connect C-cover FPC – Remove the protective battery cover. Hover the C-cover over the device and press the FPC connector onto the main board.

6. 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 the top area until you hear a click and the C-cover flattens out.

CAUTION: Ensure the C-cover is correctly aligned before closing the display.

7. Install C-cover Screws – Close the display. Turn the unit over and install the 4 new screws until snug, then turn another 45 degrees (1/8 turn) or until fully fastened.

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

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

Prerequisite Steps:

Power off the device and disconnect from power.

Follow all general safety and ESD compliance steps.

Remove the non-skid feet.

Remove the C-cover assembly (metal or fabric type).

Procedure – Removal (rSSD)

1. Remove rSSD Screw – Use a 5IP (Torx-Plus) driver to remove the screw securing the rSSD.

WARNING: Be very careful to position your screwdriver directly over the rSSD screw and to avoid slipping towards the battery during removal. If the battery is contacted, impacted, or damaged, cease activities immediately.

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 the same ~15 degree angle.

IMPORTANT: Confirm the condition of the thermal pillow that resides beneath the rSSD. It should maintain good contact and not show signs of deterioration like collapsing or cracking.

Procedure – Installation (rSSD)

IMPORTANT: Only a Microsoft rSSD with the part number as specified in the parts list, per 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 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, and then turn it another 45 degrees (1/8 turn) or until the screw is fully fastened.

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

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 – Follow the steps for installing the non-skid feet.

Preliminary Requirements & Prerequisite Steps:

WARNING: The AB-cover is extremely sensitive to ESD and should be managed accordingly. Be sure all ESD safety precautions are taken.

The device must first be set in AB-cover Replacement Mode before the old AB-cover is removed. This requires the device to be functional enough to run software tools from Windows OS. If the display is non-functional, connect an external monitor.

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

2. Run Software Tool: In the OS, 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 proceeding.

3. Disassemble Device: Follow general safety procedures. Remove the non-skid feet, the C-cover, and the 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. This will 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 starting from one end.

3. Remove FPC RF Shield Cans – Using tweezers, remove the two shield lids by first peeling the bottom right corners. To prevent damage to the FPCs, for both shields, peel up the shield along its front edge and bend it at 45 degrees. Carefully pull vertically and twist left and right as you pull towards you to remove it.

4. Disconnect FPCs – Once shields are removed, use a Spudger tool to disconnect the 4 FPCs by prying upwards on the corners first and then along the front edge. Gently pull each FPC ribbon towards the front of the device to untuck it from under 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 for Safe Removal – Place the display module at an angle of about 90 degrees. Then remove the remaining external screw at the left and right hinges while holding the display with your free hand.

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

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). Install screws until just snug, then turn another 90 degrees (1/4 turn) or until fully fastened.

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

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

4. Tuck FPCs – Using a guitar pick, 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 AB-cover requires touch calibration:

a. Install the rSSD.

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

c. Connect the USB drive with software tools.

d. Connect the power supply.

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

f. Run the software tool `STEP2_DisplayModuleReplacement.cmd` from the USB drive. Follow prompts; the device will restart. Verify touch is working.

g. Power off the device.

h. Remove the C-cover.

i. Remove the rSSD.

6. FPC RF Shield Installation – Install 2 new shield lids above the 4 AB-cover FPC connectors. Ensure the correct shield type is used for each side (left has 2 embosses, right has 3). Push shields 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 shield by peeling off the adhesive protector and snapping them into place. Press firmly along the top of the baffle wall to adhere.

9. AB-cover Hinge Alignment:

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

b. With screws aligned, verify hinge alignment by inserting a plastic 0.40mm feeler gauge between the display and chassis. It should slide smoothly. If not, 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. On the C-cover, remove the mylars covering the closure steels using tweezers.

b. Remove the old closure steels from the two regions at the front edge of the C-cover.

c. Clean the area with a cotton swab and IPA.

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

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

f. Place new mylar tape over the steel, ensuring it’s fully covered and overlaps onto the C-cover. Use a spudger to smooth and flatten the tape.

11. Fit C-cover – Follow the C-cover reassembly instructions but do not install the feet screws yet.

12. Check AB-cover alignment – Close the device and confirm flushness across the entire front edge. If not flush, remove hinge screws, repeat step 9, then re-fit the C-cover.

13. rSSD Install – Install the rSSD.

14. C-cover Install – Complete the C-cover installation, including screws.

15. Run SDT – Power on and run the Surface Diagnostic Toolkit to validate functionality.

16. Install Feet – If all tests pass, install the non-skid feet.

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). Install screws until just snug, then turn another 90 degrees (1/4 turn) or until fully fastened.

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

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

4. Tuck FPCs – Using a guitar pick, 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 AB-cover requires touch calibration:

a. Install the rSSD.

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

c. Connect the USB drive with software tools.

d. Connect the power supply.

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

f. Run the software tool `STEP2_DisplayModuleReplacement.cmd` from the USB drive. Follow prompts; the device will restart. Verify touch is working.

g. Power off the device.

h. Remove the C-cover.

i. Remove the rSSD.

6. FPC RF Shield Installation – Install 2 new shield lids above the 4 AB-cover FPC connectors. Ensure the correct shield type is used for each side (left has 2 embosses, right has 3). Push shields 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 shield by peeling off the adhesive protector and snapping them into place. Press firmly along the top of the baffle wall to adhere.

9. AB-cover Hinge Alignment:

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

b. With screws aligned, verify hinge alignment by inserting a plastic 0.40mm feeler gauge between the display and chassis. It should slide smoothly. If not, re-align.

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

10. Fit C-cover – Follow the C-cover reassembly instructions but do not install the feet screws yet.

11. Check AB-cover alignment – Close the device and confirm flushness across the rear corners of each hinge. If not flush, remove hinge screws, repeat step 9, then re-fit the C-cover.

12. rSSD Install – Install the rSSD.

13. C-cover Install – Complete the C-cover installation, including screws.

14. Run SDT – Power on and run the Surface Diagnostic Toolkit to validate functionality.

15. Install Feet – If all tests pass, install the non-skid feet.

A calibration routine is required when an AB-cover Display Assembly is replaced. The tool runs from a USB drive within the Windows OS.

USB Drive Setup – Directory Structure and Files

Copy the 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 device must be functional enough to run the tools from the Windows OS.

If the device has a secured Windows login, credentials will be required.

Once logged in, use Windows Explorer to navigate to the USB drive and run the calibration tools as directed in the AB-cover Display Assembly Replacement Process.

The tools perform two functions:

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

Perform touch calibration on the new AB-cover (STEP 2).

The process involves two command files run at different stages of the repair.

When `STEP1_DisplayModuleReplacement.cmd` is invoked (before removing old display):

1. A command window opens, indicating Step 1 initiation.

2. The tool reports that the device has successfully entered into Servicing Mode (AB-cover replacement mode).

3. You are prompted to authorize device shutdown by entering ‘y’ or ‘Y’ and pressing ENTER.

4. The tool confirms the shutdown authorization and begins a 10-second countdown.

5. A Windows OS alert “You’re about to be signed out” appears. The device will shut down, allowing you to proceed with the display replacement.

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

1. A command window opens, indicating the tool is running.

2. The tool initiates calibration preliminary device testing (sanity tests, shorts test).

3. The tool prompts that calibration is about to begin, reminding you NOT to touch the screen or plug in power during the process. A countdown is shown.

4. The tool reports that the calibration routine is in progress.

5. The tool reports the results of the calibration process (e.g., “Calibration completed successfully”).

6. The tool initiates an OS restart. A Windows OS alert “You’re about to be signed out” appears, and the device will restart to complete the process.

If at any point the tool shows an error screen indicating calibration failure, follow the on-screen prompts or proceed to the calibration retry steps.

If touch calibration fails, it is necessary to retry the process. This involves replacing the AB-cover again.

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 on the chassis (no screws required).

c. Connect the software tools USB drive.

d. Connect the power supply.

e. Power on the device.

f. Run the software tool `STEP1_DisplayModuleReplacement.cmd`. Accept the power down prompt once the tool is run.

2. Disassembly:

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

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

c. Place a Microsoft-provided ESD-safe battery cover across the device to protect the battery.

d. Remove the rSSD. This ensures 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 new AB-cover to accept new touch calibration data.

4. Re-Preparation for Calibration:

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 the software tool `STEP2_DisplayModuleReplacement.cmd`. Follow prompts, and the device will restart. Verify touch is working.

5. Navigate and Run SDT: Using Windows Explorer, navigate to the USB drive and run the SDT tool.

6. Run SDT Test: Within the SDT tool, choose Select Tests, Touch Display Repair, and click 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.