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Galaxy Z Fold4 Disassembly/Assembly

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Galaxy Z Fold4 Repair Steps
Disassembly & Assembly

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  • Page 1 Galaxy Z Fold4 Repair Steps Disassembly & Assembly...
  • Page 2 What are we learning? What components make up the Galaxy Z Fold4? How do you properly disassemble the device during repair? How do you ensure the device is correctly assembled after a repair is complete? What tools are required during repair? How do I validate my repair? This training will explore how to provide expert repairs on the Galaxy Z Fold4.
  • Page 3 Galaxy Z Fold4 Parts Removable parts of the Galaxy Z Fold4 Galaxy Z Fold4...
  • Page 4 Removable Parts of Galaxy Z Fold4 Galaxy Z Fold4 has multiple removable parts. Being able to identify the parts and understand their functions will assist you in the diagnostics and repair of the device. The parts include: • Front Assembly Bracket - Main Display (Foldable UB) •...
  • Page 5 Back Glass and Sub UB • Back Glass - Covers the rear of the device • Sub UB - The front display of the device Back Glass Inner SUB UB...
  • Page 6 Rear Assembly: Main PBA Side The Rear Assembly is made up of two (2) pieces, and sits between the Back Glass and the Main PBA. It is broken down into the following: • Top: Covers Main PBA, UWB Antenna, and NFC/Wireless Charging Coil •...
  • Page 7 Rear Assembly: Sub UB The Sub UB Rear Assembly is made up of two (2) pieces, and sits between the Sub Display and the Sub PBA. It is broken down into the following: • Top: Covers the Sub PBA • Bottom: Covers the S Pen PBA Bottom...
  • Page 8 Components There are a few smaller components on Galaxy Z Fold4 that can be removed. These are: • Vibrator Motor 5G mmWave Antenna Vibrator Motor Flex Connectors Modules • Flex connectors • Single Front Facing Camera (2) • Main Cameras •...
  • Page 9 Main PBA The Main PBA is the main board of the device. It contains the most essential components of the device such as: • Mobile Chipset (CPU, GPU, and Radio) • Main Camera • Built in Storage • Top Microphone Front Back...
  • Page 10 USB PBA The USB PBA is connected to the Main PBA with a flex cable. It contains the Interface (I/F) Port in order to: • Charge the device Battery • Establish a connection to a PC or Mac for file transfer or diagnostics USB PBA...
  • Page 11 Sub PBA The Sub PBA is the secondary board of the device. It powers the Sub UB Display and contains many other components of the device such as: • Sub Display • Front Facing Camera • SIM PBA Connector • Battery Connector SUB PBA...
  • Page 12 SIM PBA The SIM PBA contains the compartment for the SIM Card. SIM PBA...
  • Page 13 S Pen PBA The S Pen PBA contains the hardware needed for the S Pen to work: • ADS FPCB (Antenna Digitizer Sensor Speaker FPCB) S Pen PBA...
  • Page 14 Front Assembly The Front Assembly of Galaxy Z Fold4 includes the following: • The Main Display • The Hinge • Fingerprint Sensor • Vibrator Motor • 2 Lithium-ion Batteries...
  • Page 15 The Batteries Galaxy Z Fold4 has two (2) Batteries. The Batteries are Lithium-ion (Li-ion) cells, and must be handled carefully. Improper removal can damage cells, causing them to ignite and cause injury: • Only hold the Battery from the center sides •...
  • Page 16 Galaxy Z Fold4 Disassembly Disassembly of Galaxy Z Fold4 Galaxy Z Fold4...
  • Page 17 In this section we will review the disassembly of Galaxy Z Fold4 This guide will cover • The tools and equipment needed • The steps of disassembly So how does this help me? With this knowledge, you will be able to completely disassemble the Galaxy Z Fold4.

  • Page 18: Tools And Equipment

    Tools and Equipment To ensure proper disassembly without damage to the device, use the proper tools and equipment: Torque Screwdriver ESD Plastic Tweezers Disassembly Stick Ceramic Scissors ESD Metal Tweezers ESD Wrist Strap ESD Grounded Mat Anti-static Gloves Isopropyl Alcohol Suction Cup...
  • Page 19 Tools and Equipment, cont. To ensure proper disassembly without damage to the device, use the proper tools and equipment: GH81-22755A Blue Rubber Seals New Rubber Seal ESD Spatula SIM Eject Tool Cap Protection Tape Anti-static Sheet...
  • Page 20 Steps of Disassembly You will disassemble the device in the following order: • Back Glass & Sub UB • Rear Assembly • PBA  Main, USB, SUB, and SIM • Parts on the Main PBA  Main Camera • Parts on the Bracket ...

  • Page 21: Electrostatic Discharge Precautions

    Electrostatic Discharge Precautions Before you begin to disassemble, make certain that all ESD precautions are met. This includes: • Wearing an ESD Strap which has passed all required tests • Wearing Anti-static Gloves • Working over a Grounded Mat ESD Wrist Strap Anti-static Mat Anti-static Gloves...
  • Page 22 Swollen Battery Precautions If the device has a swollen Battery, DO NOT heat the device. • A swollen Battery will cause a device to bulge • Heating a device with a swollen Battery can cause further damage to the device and cause the Battery to ignite •...
  • Page 23 Eject SIM Tray Before disassembling the device, the SIM Tray must be removed. Insert the SIM Removal Tool into the SIM Eject Slot on the side of the device and slide the SIM Tray out. Tool Required SIM Eject Tool...
  • Page 24 Apply Cap Protection Tape To prevent scratches to the caps, apply tapes to each cap. The caps are located on the top and bottom sides of the Hinge. Tool Required Cap Protection Tape...
  • Page 25 The Standard Base was replaced with a New Base for the launch of the Galaxy Z Fold2. The New Base allows the Fold2 and the Galaxy Z Fold4 to lay flat in the AOD. Ensure the New Base is installed prior to using the AOD.
  • Page 26 AOD Settings Step 4 Set the AOD to the correct temperature and heating time based Upper Lower Time Preheating Upper OCTA 0070 5:00 on the state of charge (SOC). 5:00 0060 Lower °C °C • For Back Glass removal <=68% SOC: Upper 70°C / Lower 60°C for 5 minutes Upper Lower Time...
  • Page 27 Back Glass Removal Insert the device face down, unfolded, into the AOD with the Back Glass aligned with the center vacuum. • Ensure that the left and right vacuums are in the OFF position • Turn the knob to lock the device into place and close the AOD Lid •...
  • Page 28 Tape Removal Once the Back Glass is lifted, remove all double-sided tapes and tape residue from the Back Glass and rear assembly completely. DO NOT remove the white Gore-Tex tape of the 3 Mic and be careful not to damage. mic tape location on Rear assembly...
  • Page 29 Sub UB Removal Replace the middle vacuum with the normal blue vacuum seal. Flip the device around in the AOD and make sure that the Sub UB is aligned with the center vacuum. • Ensure that the left vacuum is off and the right vacuum is in the on position •...
  • Page 30 Sub UB Removal, cont. Once lifted, remove the device from the AOD and place it on the ESD Mat. Flip the SUB UB Display over to reveal the FPCB Cable and cover. Gently insert the Tweezers and remove the FPCB Cap. To prevent the Cap from flying out, lay your finger over the Cap while removing it with the Tweezers.
  • Page 31 Rear Assembly Removal To avoid magnetic attraction between the magnet points and screws, use the Anti-static Sheet by placing it over the device rear making sure all the holes on the sheet line up with the screws. Using the Torque Screwdriver, remove 14 screws from the Sub UB on the Rear Assembly side.
  • Page 32 Rear Assembly Removal: Sub UB Insert the tip of the Tweezers at the entry point and twist gently towards you to disconnect the Sub UB Top Rear Assembly clips. This will prevent any damage to the PBAs. Once the Sub UB Top Rear Assembly clips have been disconnected, remove the Top of the Sub UB Rear Sub UB Rear Assembly Top...
  • Page 33 Rear Assembly Removal: Sub UB, cont. Using Tweezers, remove the Sub UB Bottom Rear Assembly by using the correct entry point. Tool Required Sub UB Bottom Rear Assembly Tweezers Device Rear...
  • Page 34 Rear Assembly Removal: Back Glass Using a Disassembly Stick, disconnect the UWB FPCB and NFC FPCB from the Main PBA. Flip the NFC to the right and use a Disassembly Stick to disconnect the USB PBA to Main PBA FPCB. Tools Required Disassembly Stick Device Rear...
  • Page 35 Rear Assembly Removal: Back Glass, cont. Using Tweezers, remove the Back Glass Top Rear Assembly by using the correct entry point. Tools Required Back Glass Top Rear Assembly Tweezers Device Rear...
  • Page 36 Rear Assembly Removal: Back Glass, cont. Using Tweezers, remove the Back Glass Bottom Rear Assembly by using the correct entry point. Tool Required Tweezers Back Glass Bottom Device Rear Rear Assembly...

  • Page 37: Disconnect Battery

    Disconnect Battery Using a Disassembly Stick, disconnect both Battery FPCBs. The Left Battery FPCB is underneath the Main to USB FPCB. Tool Required Disassembly Stick...
  • Page 38 FFC Removal Using a Disassembly Stick, disconnect the Front Facing Camera’s FPCB from the Main PBA: • Lift the Front Facing Camera away from Front Assembly and Front Facing place it with the lens up on the Camera ESD Mat Tool Required Disassembly Stick...
  • Page 39 Main PBA Removal, cont. Using a Disassembly Stick, disconnect seven (7) remaining FPCBs from the Main PBA. Using a Torque Screwdriver, remove two (2) black screws from the Main PBA. Tool Required Torque Screwdriver Disassembly Stick...
  • Page 40 Main PBA Removal, cont. Using a Disassembly Stick, disconnect seven (7) remaining FPCBs from the Main PBA. Tool Required Disassembly Stick...
  • Page 41 Main PBA Removal, cont. Using a Torque Screwdriver, remove two (2) black screws from the Main PBA. Tool Required Torque Screwdriver...
  • Page 42 Main PBA Removal, cont. Using the curved end of the Disassembly Stick, lift the Main PBA away from the Front Assembly using the correct entry point. Main PBA Tool Required Disassembly Stick...
  • Page 43 Main Camera Removal Using a Disassembly Stick, remove the three (3) Camera FPCBs from the back of the Main PBA. • Without touching the lens, place the Main Camera on the ESD Mat with the lens facing up Note: If available, utilize lens covers to keep the lens free from damage, dirt, debris, and fingerprints.
  • Page 44 USB PBA Removal Using the Disassembly Stick, disconnect two (2) FPCBs from the USB PBA: • Set the two cables to the side facing up so that you do not damage the connectors on the cables or the cables Using the Torque Screwdriver, remove three (3) silver screws from the USB PBA.
  • Page 45 USB PBA Removal, cont. Using the Disassembly Stick, lift the USB PBA from the Front Assembly using the correct entry point. Tool Required Disassembly Stick...
  • Page 46 Sub PBA Removal Using the Disassembly Stick, disconnect five (5) FPCBs from the Sub PBA. Use Plastic Tipped Tweezers to disconnect the Coaxial Cable from the Sub PBA. Using the Disassembly Stick, lift the Sub PBA away from the Front Assembly. Tool Required Tweezers Disassembly Stick...
  • Page 47 SIM PBA Removal Using the Torque Screwdriver, remove one (1) screw from the SIM PBA. • Remove the SIM PBA from the Front Assembly Tool Required Torque Screwdriver...
  • Page 48 S Pen PBA Removal Using a Disassembly Stick, disconnect FPCB from the S Pen PBA Using a Disassembly Stick, remove the S Pen PBA from the Front Assembly Tool Required Disassembly Stick...
  • Page 49 Vibrator Motor Removal Using Tweezers, remove the Vibrator Motor using the correct entry point. The Vibrator Motor will be pre- installed in the replacement Front Assembly component; remove the Motor ONLY when needed to complete repair. Tool Required Tweezers...
  • Page 50 mmWave Antenna Module Removal Using a Torque Screwdriver, remove one (1) screw from the top left mmWave Module. • Using Tweezers lift, the mmWave V Antenna Module away from the Front Assembly mmWave V using correct entry point Antenna • Using Tweezers, lift the mmWave H Antenna Module away from the Front Assembly mmWave H using the correct entry point...

  • Page 51: Battery Removal

    Battery Removal To remove the Batteries, use 99% Isopropyl Alcohol along the outside edges of the Battery, using a Swab to properly apply the Alcohol: • Start with 0.3mL of alcohol; if this doesn’t work, add 0.3mL of alcohol • Use a Battery Absorber to lift Batteries away from the Assembly •...

  • Page 52: Battery Handling

    Battery Handling Batteries should never be reused. Batteries must be recycled according to Standard Operating Procedures (SOP). Before recycling the Battery, the Battery lead must be sent back to Samsung using the U-Class process. Using ONLY Ceramic Scissors, cut the lead off of the Battery.
  • Page 53 Disassembly of Galaxy Z Fold4 The device has now been disassembled. We have covered the disassembly process of the Galaxy Z Fold4. At this point all detachable components have been removed. Keep in mind: • In a repair scenario, only remove as much as required for the repair •...
  • Page 54 Galaxy Z Fold4 Assembly Assembly of Galaxy Z Fold4 Galaxy Z Fold4...
  • Page 55 Assembly of Galaxy Z Fold4 Putting it back together In this section we will review the assembly of the Galaxy Z Fold4. This section will cover • The tools and equipment needed • The steps of assembly So how does this help me? With this knowledge you will be able to completely assemble Galaxy Z Fold4.
  • Page 56 Tools and Equipment To ensure proper disassembly without damage to the device, use the proper tools and equipment: Tweezers Disassembly Stick Torque Screwdriver Anti-static Gloves Anti-static Mat Press Jig Device Press Pads Battery Press Pads...
  • Page 57 Sub UB Rework Kit Back Glass tape, Sub UB tape, and screws must always be replaced upon assembly. Item (Non-reusable) Quantity SVC Code Area Global GH81-22521A A/S Tape Sub UB A/S Tape Sub UB Inner GH81-22523A A/S Sub UB Rework Kit GH82-29454A GH81-22522A A/S Tape Sub UB Inner L...
  • Page 58 Main PBA Rework Kit Back Glass tape, Sub UB tape, and screws must always be replaced upon assembly. Item (Non-reusable) Quantity SVC Code Area Global GH81-22796A A/S-Tape Back Glass GH81-21133A Motor Tape A/S Main Rework Kit GH82-29455A Tape 3 GH02-24100A Main Rear Screw (11) L2.5 SILVER 6001-003442...

  • Page 59: Steps Of Assembly

    Steps of Assembly You will assemble the device in the following order: • Battery • Parts on the Bracket  mmWave and Vibrator • Parts on the Main PBA  Main Camera • PBA  Main, USB, SUB and SIM •...
  • Page 60 Install New Batteries Remove the blue film from both Batteries and lay them in their positions on the Front Assembly. After the Batteries are in place, use the Battery Press Pads to press each Battery for 5 seconds with 0.6N of force. Battery Press Pad...
  • Page 61 Install mmWave Antenna Modules Apply new tapes to the mmWave Modules. • mmWave V Antenna tape: GH02-24303A • mmWave H Antenna tape: GH02-24373A mmWave V Antenna Align both mmWave Modules onto the Front Assembly and insert one (1) silver screw into mmWave H the top left Module to secure it.
  • Page 62 Install Vibrator Motor Install the Vibrator Motor by aligning it onto the Front Assembly and then pressing it down with an index finger. Make sure to replace the Motor Tape when reusing the Motor. Part Required Motor Tape GH81-21133A...
  • Page 63 Install S Pen PBA Align the S Pen PBA onto the Front Assembly using the prong as your guide. Connect the FPCB to the S Pen PBA and align the coaxial cable into the bracket. Align the Digitizer connector with both the white Silk Line and the Stiffener, then turn the device over to connect it.
  • Page 64 Install SIM PBA Align the SIM PBA onto the Front Assembly. Using a Torque Screwdriver, insert one (1) silver screw at 1.3kgf to secure it. Tool Required Torque Screwdriver...
  • Page 65 Install Sub PBA Align the Sub PBA onto the Front Assembly. Connect five (5) FPCBs to the Sub PBA and Coaxial Cable (DO NOT connect the Battery FPCB yet).
  • Page 66 Install USB PBA Inspect the USB PBA for damage before assembly: • Damage on C-Clip at the right top area of the board • Damage or non-contact of 3 C-Clips at the bottom left of the board...
  • Page 67 Install USB PBA Align the USB PBA onto the Front Assembly. Make sure that the PBA is not lifted up or on the guide rib, and that the Mic is lined up correctly. Using the Torque Screwdriver, insert three (3) new silver screws at 1.1kgf to secure it.
  • Page 68 Install Main Camera Align the Camera onto the Main PBA without touching the lens. Connect three (3) Camera FPCBs to the back of the Main PBA.
  • Page 69 Install Main PBA Align the Main PBA onto the Front Assembly. Make sure that the Main PBA has no lifting, or the Hall IC Calibration and/or screen conversion will fail. Using a Torque Screwdriver, insert two (2) new black screws into the Main PBA at 1.1kgf.
  • Page 70 Install Main PBA Connect seven (7) FPCBs to the Main PBA. Make sure to use BOTH HANDS when connecting the 78-pin PBA connectors, or the connectors on the FPCB and/or Main PBA may be damaged.
  • Page 71 Install Front Facing Camera Align the Front Facing Camera onto the Front Assembly and connect the FPCB to the Main PBA. Note: If you are doing an OCTA replacement, do not use Tweezers to pull the BOHO tape from the Camera, or the lens may be scratched.
  • Page 72 Connect the Batteries Connect both Battery FPCBs.
  • Page 73 Install Rear Assembly: Back Glass On the Back Glass side, install the Rear Assembly starting from the bottom piece working upwards. • Install the Back Glass Bottom Rear Assembly by snapping it into place • Install the Back Glass Top Rear Assembly by snapping it into place •...
  • Page 74 Install Rear Assembly: Back Glass, cont. Connect 3 FPCBs to the Main PBA: • UWB FPCB • NFC FPCB (Should NOT be folded inward) • FRC Connector (Should be OVER the rear case)
  • Page 75 Install Rear Assembly: Sub UB On the Sub UB side, install the Rear Assembly starting from the bottom piece, and working upwards. • Install the Sub UB Bottom Rear Assembly by snapping it into place • Install the Sub UB Top Rear Assembly by snapping it into place...
  • Page 76 Rear Assembly: Inserting New Screws, cont. Using a Torque Screwdriver, insert 14 new screws into the SUB UB side at 1.3kgf. Using a Torque Screwdriver, insert the remaining 11 new screws into the Back Glass side at 1.1kgf. Tool Required Torque Screwdriver...
  • Page 77 Assembly: Sub UB Tapes Apply Tapes • Apply the L/R tapes onto the rear assembly and make sure they are properly aligned with the screws. • Then align the Sub UB outer tape onto the rear assembly. Sub UB Tapes...
  • Page 78 Assembly: Back Glass Tape Apply Tapes • Attach 3 mic tape on the inside of the back glass and remove the green film • Align the back glass tape onto the rear assembly and ensure it is properly aligned with the screws. Mic Tape Main Body (Back Glass)
  • Page 79 Install Sub UB Remove green film from Sub UB Outer tape 1 and then Sub UB L/R tapes. Connect the SUB UB FPCB to the Sub PBA. Install the Sub UB FPCB Cap. Lay the SUB UB Display into place using the Camera hole as a guide.
  • Page 80 Install Back Glass Remove green film from back glass tape and the mic tape. Lay the Back Glass onto the Rear Assembly using the Main Camera as a guide. Gently press your thumbs around the Back Glass to secure it onto the frame before moving to the Press Jig.
  • Page 81 Press SUB and Back Glass Check for any gaps or differences between the Back Glass/Sub UB and Metal Frame. • Place the device in the Press Pads face down • Place the top Pad over the Sub UB side • Place the Press Pads into the Press Jig and make sure the top Pad is aligned in the center of the Press Jig •...
  • Page 82 Galaxy Z Fold4 Outbound Quality Check OQC and Required Calibrations Galaxy Z Fold4...
  • Page 83 Make sure the SIM Tray is reinstalled and perform a final visual inspection of the device. Once the repair is complete, perform an Outbound Quality Check. Calibration tests for the Galaxy Z Fold4 include: WRT Using Blue MLC • Under Display Camera Cal •...
  • Page 84 Customer Pickup Perform one last visual inspection and return the device in the following condition: • Updated with the most recent firmware build • State of charge at 100% Wipe the device clean using a clean, dry microfiber cloth to remove any fingerprints or debris.
  • Page 85 Appendix Galaxy Z Fold4 APPENDIX Galaxy Z Fold4...

  • Page 86: Identifying Connectors

    Identifying Connectors...
  • Page 87 <- Lower FPCB double reiteration line When testing with the Galaxy Z Fold4 folded, Connect the extension FPCB to the right end of the Upper FPCB, Connect to the main and sub PBA of Galaxy Z Fold4. ※ Replace Front Ass'y only when improvement of...
  • Page 88 <- Upper FPCB double reiteration line When testing with the Galaxy Z Fold4 folded, Connect the extension FPCB to the right end of the Lower FPCB, Connect to the main and sub PBA of Galaxy Z Fold4. ※ Replace Front Ass'y only when improvement of bad symptoms is confirmed before and after connection.
  • Page 89 Spreading Sheet Jig If the rubber sheet is partially damaged, Use the sheets to straighten it. ※ Be careful not to damage the MAIN...

  • Page 90: Battery Replacement

    Battery Replacement When replacing the battery, Galaxy Z Fold4 differs from Q2. There is no problem even if the left / right battery is not the same company. You can use it in combination. It is optimized to be used regardless of battery manufacturer.
  • Page 91 SVC Calibration For Fold4, Here is SVC calibration information for each model. - Vibrator Motor Calibration is newly added for Fold4 only. F936U Service Calibration F936 SVC Tool TSP Calibration Speaker Calibration Force Touch Calibration Optical Finger print Calibration TOF Camera Calibration Digital Hall IC Calibration mmWave RF Calibration Daseul...
  • Page 92 SVC Calibration(Motor Cal #1) Whenever Main PBA or Vibrator Motor is replaced, Calibration is required to optimize vibrator motor’s performance. Target model is Fold4 which uses Horizontal Type Vibrator Motor. Z Flip4 which use Vertical Type Vibrator Motor is not the target model. Cases: (1) Main PBA replacement (2) Vibrator Motor replacement...
  • Page 93 SVC Calibration(Motor Cal #2) No need to special Jigs and It is available with Galaxy Diagnostics. (1) Run GD Repair Mode and Select “PBA” or “Other internal component replacement” then select “Start diagnostics”. - You can use “Vibrator motor calibration” if you want to run the calibration only.
  • Page 94 SVC Calibration(Motor Cal #3) (2) Fold the device and locate the device on a flat wooden desk to run Vibrator Motor Calibration. If not(Unfolded condition), the Calibration will not be started. <Caution> ①While Calibration, Do not grab, hold or touch the device. ②Device Vibrating is included on calibration sequence.
  • Page 95 SVC Calibration(Motor Cal #4) (3) Check the result...
  • Page 96 SVC Calibration (Digital Hall IC Cal #1) Whenever Main PBA(Digital Hall IC) or Front Ass’y is replaced, Calibration is required to set initial value to the sensor for opening and closing operation. Digital Hall IC is used to detect device folding status (Opening or Closing) with measured magnetic force value. So the initial magnetic force value needs to be set again by measurement after PBA or Display replacement.
  • Page 97 SVC Calibration (Digital Hall IC Cal #2) No need to special Jigs and It is available with Galaxy Diagnostics. (1) Run GD Repair Mode and Select “PBA” or “Display” then select “Start diagnostics”.
  • Page 98 SVC Calibration (Digital Hall IC Cal #3) (2) Digital Hall IC calibration is started automatically with un-folded device state. <Caution> ① Do NOT fold the device and keep un-folded state while calibration. ② There must be no magnetic objects next to the Fold4 device while calibration.
  • Page 99 SVC Calibration (Digital Hall IC Cal #4) (3) Check the Result...
  • Page 100 TSP, Speaker, Multi Camera, UDC Calibration, mmWave RF Calibration, The method and required Jigs are same as before. - Galaxy Diagnostics : TSP, Speaker, UDC Calibration, Multi Camera Calibration - Dasuel : mmWave RF Calibration (US, JPN only) Multi Camera Calibration...
  • Page 101 Summary You should now be able to: Explain what tools are required for disassembly and reassembly of the Galaxy Z Fold4 • Describe the steps for disassembly and assembly of the device • • Complete the required OQC and calibrations on the device after repair...

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