MICROSOFT SURFACE LAPTOP 4 1951 (01) PDF Document

The service guide covers the following Surface Laptop 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)

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, please follow these precautions:

Power Off: 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.

Discharge Battery: 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.

Work Surface: Ensure your work surface is level/flat and covered with an ESD-safe, soft, non-marring material. Clean it regularly to remove debris.

Protective Gear: Wear protective eyewear. Before opening, always wear an anti-static wrist strap and confirm your work area is properly grounded to protect from electrostatic discharge (ESD).

Component Storage: Parts removed during repair should be stored in ESD-safe bags and packaged for return or recycling in the same packaging as the new part.

Battery Damage: If battery damage (leaking, expansion, folds) is discovered, DO NOT proceed. Contact Microsoft for proper device disposition.

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

Check for Loose Articles: Before reassembling, ensure no loose articles are on the back cover or inside the device.

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

Powering On: To power on the device after rSSD removal, both the rSSD and C-cover must be re-installed.

This device contains a built-in, lithium-ion rechargeable battery. 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 opening the device, 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. DO NOT dispose of used lithium-ion batteries, whether damaged or not, in household or commercial garbage or recycling bins.

A thermal event is a rapid chemical chain reaction inside a battery cell, releasing energy suddenly and resulting in heat, smoke, or fire. Act immediately if you see any of the following symptoms:

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 it 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 any Microsoft device 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 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.

Please refer to the following tables for C-cover Keyboard Assembly parts for Metal or Fabric types.

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

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 a warning label that indicates the following:

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.

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. 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. 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.

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 and no adhesive residue is left before applying new feet.

Procedure – Installation (Non-Skid Feet)

Note: Any further repairs 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.

Note: Any further repairs 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. 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 gap is smaller than 0.05 mm. If gap is larger, replace 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 gap is smaller than 0.05 mm. If gap is larger, replace foot.

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

Required Tools and Components:

Tools:

Software Tool – SDT

Isopropyl Alcohol Dispenser (use only 70% IPA)

5IP (Torx plus) driver

Anti-static wrist strap (1M Ohm resistance)

Recommended: ESD-safe battery cover (13.5″ or 15″)

Components:

C-cover (If replacing refer to Illustrated Service Parts List)

(New 5IP screw quantity= 4 supplied with component)

Prerequisite Steps:

Power off device, ensure it’s disconnected from power supply.

Follow general safety and ESD compliance steps.

Remove non-skid feet. Ensure all foot adhesive is removed from the sockets before screw removal.

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. Take care not to depress the power button. Ensure the driver is seated correctly to avoid stripping the screw heads.

2. Separate C-cover from device – Turn the device over and open the display. The C-cover is secured by magnets. Grab the C-cover edge closest to the display and slowly remove it at an angle. Do not pull apart beyond 45 degrees to avoid damaging the C-cover FPC.

3. Position C-cover 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 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 removed C-cover in a safe place, key side down, to protect the FPC. It is recommended to place an ESD-safe battery cover over the device battery.

Procedure – Installation (Metal Type)

1. Pre-installation Inspection – Verify the battery’s condition and check the Liquid Damage Indicator (LDI) inside the audio jack. Devices with battery issues or a triggered LDI require whole unit replacement.

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

3. Install rSSD – Follow the rSSD installation procedure.

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

5. Connect C-cover FPC – Remove the battery cover. Hover the C-cover over the device and press the FPC connector onto the main board. Ensure the FPC bends properly without new folds or creases.

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.

7. 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.

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

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

Required Tools and Components:

Tools:

Software Tool – SDT

Isopropyl Alcohol Dispense (use only 70% IPA)

5IP (Torx plus) driver

Heavy duty suction cups

Anti-static wrist strap (1M Ohm resistance)

Recommended: ESD-safe battery cover (13.5″ or 15″)

Components:

C-cover (If replacing refer to Illustrated Service Parts List)

(New 5IP screw quantity=4 supplied with component)

Prerequisite Steps:

Power off device, ensure it’s disconnected from power supply.

Follow general safety and ESD compliance steps.

Remove non-skid feet. Ensure all foot adhesive is removed from the sockets before screw removal.

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. Take care not to depress the power button.

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. Do not place it on the trackpad. Do not wet the suction cup. Place a thumb on the corner hinge side to hold it down, and pull up on the suction cup to separate the cover.

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

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

5. C-cover hook clearance – While angled, pull the C-cover directly towards yourself to clear the hook latching mechanism.

6. Disconnect FPCs – While hovering the C-cover, disconnect the FPC from the main board by pulling up on the metal head vertically. Place the removed C-cover in a safe place, key side down. It is recommended to place an ESD-safe battery cover over the device battery.

Procedure – Installation (Fabric Type)

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

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

3. Install rSSD – Follow the rSSD installation procedure.

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

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

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

7. 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.

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

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

Required Tools and Components:

Tools:

Software Tool – SDT

Isopropyl Alcohol Dispenser (use only 70% IPA)

5IP (Torx plus) driver

Anti-static wrist strap (1M Ohm resistance)

Recommended: ESD-safe battery cover (13.5″ or 15″)

Components:

rSSD (If replacing refer to Illustrated Service Parts List)

(New 5IP screw supplied with component)

Prerequisite Steps:

Power off device and disconnect from power.

Follow all general safety and ESD compliance steps.

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 screw securing the rSSD. Be very careful to position your screwdriver directly over the screw and to 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 the same ~15 degree angle. Confirm the condition of the thermal pillow beneath the rSSD; it should be intact and not show signs of deterioration.

Procedure – Installation (rSSD)

Note: Only a Microsoft rSSD with the part number 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, then turn it another 45 degrees (1/8 turn) or until fully fastened. Be careful to avoid slipping towards the battery.

3. Install C-cover – Follow the steps for C-cover Keyboard Assembly Replacement Processes (Metal or Fabric).

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 SDT to ensure all device features and functions operate as expected. If tests pass, continue with final assembly.

6. Install Feet – Follow the steps for installing the non-skid feet.

Prerequisite Steps – Set Replacement Mode

The device must first be set in AB-cover Replacement Mode before the old display is removed. This pulls calibration data from the old AB-Cover. If the old display is non-functional, connect an external PC monitor.

1. 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. Run the software tool: `STEP1_DisplayModuleReplacement.cmd`. Accept the power down prompt once the tool is run. This step must be completed successfully before replacing the display assembly.

Prerequisite Steps – Disassembly

1. Follow all general safety and ESD compliance steps.

2. Remove the non-skid feet.

3. Remove the C-cover (keyboard assembly).

4. Remove 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.

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. Peel up the shield along its front edge and bend it to 45 degrees. Carefully pull vertically and twist to remove it, preventing 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 for 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) until fully fastened.

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 – 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).

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 the software tool: `STEP2_DisplayModuleReplacement.cmd`. 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 FPC connectors. Ensure the correct shield type is used for each side (left has 2 embosses, right has 3). Push the 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 to adhere.

9. AB-cover Hinge Alignment – Set the display to 90 degrees. Shift the innermost screw on each side so that the screws are concentric with the circular feature on the hinge. Verify alignment by inserting a 0.40mm feeler gauge between the display and chassis; it should slide smoothly. If not, re-align. 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) – This requires replacing the C-cover closure steels.

a. Remove mylars covering the closure steels on the C-cover using tweezers.

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

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

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

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

f. Place mylar tape over each steel, ensuring it is fully covered and overlaps onto the C-cover.

g. Use a Spudger tool to smooth and flatten the tape.

11. Fit C-cover – Follow steps 2-4 of the C-cover reassembly instructions, but do not install any Feet screws yet.

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

13. rSSD Install – Follow the rSSD installation procedure.

14. C-cover Install – Follow the procedure for installing a metal C-cover.

15. Run SDT – Power on the device and validate full functionality by running the SDT tool.

16. Install Feet – If SDT tests pass, follow the procedure for installing 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) until fully fastened.

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 – 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).

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 the software tool: `STEP2_DisplayModuleReplacement.cmd`. 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 FPC connectors. Ensure the correct shield type is used for each side (left has 2 embosses, right has 3). Push the 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 to adhere.

9. AB-cover Hinge Alignment – Set the display to 90 degrees. Shift the innermost screw on each side so that the screws are concentric with the circular feature on the hinge. Verify alignment by inserting a 0.40mm feeler gauge between the display and chassis; it should slide smoothly. If not, re-align. Secure the hinge by turning all 6 hinge screws another 90 degrees (1/4 turn) or until fully fastened.

10. Fit C-cover – Follow steps 2-4 of the C-cover reassembly instructions, but do not install any Feet screws yet.

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

12. rSSD Install – Follow the rSSD installation procedure.

13. C-cover Install – Follow the procedure for installing a fabric C-cover.

14. Run SDT – Power on the device and validate full functionality by running the SDT tool.

15. Install Feet – If SDT tests pass, follow the procedure for installing 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 tools to the root directory of a USB drive. The following files are required in the same directory:

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 the OS.

Login credentials may be required for secured Windows accounts.

The tools perform two functions:

Set the device under repair into AB-cover replacement mode.

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

Running the Tools

The tools are run as part of the AB-cover Display Assembly Replacement Process.

When STEP1_DisplayModuleReplacement.cmd is invoked:

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

Screen 2: Indicates the device has entered “Servicing Mode.” Prompts “Shutdown now? (Y/N):”. Enter ‘y’ and press ENTER.

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

Screen 4: Windows OS alert appears: “You’re about to be signed out.” Select Close, and the device shuts down.

When STEP2_DisplayModuleReplacement.cmd is invoked:

Screen 1: Shows “Privilege Escalation.”

Screen 2: Preliminary device testing is initiated.

Screen 3: Prompts that calibration is about to begin with the reminder: “DO NOT TOUCH THE SCREEN OR USE PEN – DO NOT PLUG IN POWER.”

Screen 4: Reports that the calibration routine is in progress.

Screen 5: Reports the results of the calibration process (e.g., “Calibration completed successfully”).

Screen 6: The tool initiates an OS restart. An OS alert appears: “You’re about to be signed out.” Select Close.

Error Screen Example: If calibration fails, the tool will display an error message and prompts to follow a retry flow.

If touch calibration fails, it is necessary to take the following steps to retry the calibration process.

Touch Calibration Steps (Retry):

1. Preparation – Confirm the following steps have been completed:

a. Install rSSD to enable device operation.

b. Temporarily connect the C-cover FPC back on to the device main board connector 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 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 the power supply.

b. Remove the temporary C-cover.

c. Ensure an ESD-safe battery cover is placed across the device to protect the battery.

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

3. Remove AB-cover – Remove the new AB-cover that was installed and install another new AB-cover. The device must see a new AB-cover to accept new touch calibration data. This step must be carried out to re-enable touch calibration.

4. Preparation (Round 2) – Repeat the preparation steps:

a. Install the rSSD.

b. Temporarily connect the C-cover.

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 verify touch is working.

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

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

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.