Samsung SM-G781U Repair Manual
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Samsung SM-G781U Repair Manual

Samsung SM-G781U Repair Manual

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Galaxy S20 FE Repair Guide
SM-G781U
Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

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Summary of Contents for Samsung SM-G781U

  • Page 1 Galaxy S20 FE Repair Guide SM-G781U Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 2: What's In This Guide

    • Disassembly of Galaxy S20 FE devices • Assembly of Galaxy S20 FE devices So how does this help me? This guide will help you perform quality repairs on Galaxy S20 FE devices. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 3 Introducing Galaxy S20 FE SM-G781U Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 4 Galaxy S20 FE Parts Removable Parts of the SM-G781U Galaxy S20 FE Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 5: Removable Parts

    Removable Parts Removable Parts Galaxy S20 FE 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: • On-Cell Touch Assembly (OCTA) •...
  • Page 6 Removable Parts The OCTA Assembly The OCTA of the Galaxy S20 FE includes the following: • The Display Panel • The Front Glass and Laminate • The Flexible Printed Circuit Board (FPCB) Connector • Vibrator Motor • Battery • Power and Volume Keys Display Specifications: •...
  • Page 7 • Mobile Chipset • Main Camera • Built in Storage • Sub Microphone Galaxy S20 FE Main PBA System on a Chip (SOC) specifications: • RAM – 6GB Front Rear • Storage – 128GB •...
  • Page 8 • Main Microphone • USB Type-C Interface (I/F) Connector • LCD Connector • Main C to C • Speaker Connector Front Rear Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 9: Additional Components

    5G mmWave • FPCB Connectors Main Camera(s) Antenna Module Galaxy S20 FE Fingerprint Sensor NOTE: If any of the above fail to function or are damaged, they must be replaced. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 10 Removable Parts The Rear Assembly Galaxy S20 FE has a Rear Assembly that is broken down into two (2) pieces. The Top contains: Sub Antenna • Receiver • Near Field Communication (NFC), Magnetic Secure • Transmission (MST) Antennas and Wireless Charging...
  • Page 11 Improper removal can damage the cell, causing it to ignite and cause injury. Charging specifications for the Galaxy S20 FE Battery: • DC 9V, 1.67A / 9V, 2.67A • 2.25A • USB Type-C Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 12 Removable Parts The Battery Cover Galaxy S20 FE has a Battery Cover that is bonded to the Frame and can only be removed utilizing heat. The Camera Shield and Battery Cover are two (2) separate pieces that must not be separated during disassembly.
  • Page 13 Galaxy S20 FE Disassembly SM-G781U Tear-Down Galaxy S20 FE Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 14 • 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 Galaxy S20 FE devices Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 15: 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 Suction Cup ESD Grounded Mat Anti-static Gloves Isopropyl Alcohol Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 16 Tools and Equipment To ensure proper disassembly without damage to the device, use the proper tools and equipment: Fold Rubber Seals ESD Spatula Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 17 • Rear Assembly • Front Facing Camera • Main PBA • Main Camera • Sub PBA • Fingerprint sensor • Antenna Assembly • mmWave Module Antenna • Battery • Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 18 Wearing an ESD Wristband that has passed all required • testing Working on an ESD Grounded Mat • Utilizing an Ion Blower during repair (where available) • Utilizing ESD compliant tools • Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 19 Battery to ignite In the event of a swollen Battery, use 99% isopropyl Alcohol to carefully separate and remove the Battery Cover. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 20 Use the SIM Ejecting Tool to remove the SIM Tray before Tray prior to disassembling the device. disassembling the device. The SIM Tray on Galaxy S20 FE is located on the top side. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 21 Perform all required AOD maintenance checks prior to the utilization of the AOD. Maintenance Checks Reset and Prevent Safe Mode AOD Jig NOTE: Refer to the AOD Maintenance Guide for more information. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 22 Battery Cover to the device. NOTE: If the State of Charge can not be identified, assume that the SOC is 68% or higher and heat under 60°C for five (5) minutes. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 23 90 or higher is reached; press the Battery Cover button to set a timer for device heating; the AOD will begin lifting the Battery Cover automatically Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 24 NOTE: Use the ESD Spatula to assist with Battery Cover removal. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 25 Disassembly Remove the Battery Cover Tapes The Galaxy S20 FE has double-sided Tapes that must be removed and replaced: Battery Cover Tape – Located around the edges of the • Battery Cover) The Battery Cover will also have one-sided tape that MUST NOT be removed.
  • Page 26 Tool required: Torque Screwdriver Remove the 16 screws that hold down the Rear Assembly. Screws are to be discarded upon removal. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 27 Detach from the right, then work your way around. Do attempt to remove the top portion yet. Attempting to pull the top piece off without using the disassembly point will break the top piece. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 28 Disassembly Remove the Rear Assembly Tool Required: Disassembly Stick Using the Disassembly Stick, disconnect the NFC FPCB from the center of the Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 29 Tool Required: Metal Tipped Tweezers To remove the bottom piece, insert the Metal Tipped Tweezers into the disassembly point, then gently twist to disconnect the bottom piece. Once disconnected, remove the Rear Assembly. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 30: Disconnect The Battery

    Always disconnect the Battery whenever working on anything which is voltage sensitive. Tool Required: Disassembly Stick To prevent any shortages during the disassembly process, disconnect the Battery lead from the Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 31 Disassembly Disconnect the FPCBs Tool Required: Disassembly Stick Additional flex cables must be disconnected from the Main PBA: • Main to Sub FPCB • mmWave Module Antennas Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 32 The blue, red, and white Coax Cables must be disconnected from the Main PBA. Insert the tip of the Tweezers underneath the base of each Coax connector and twist gently to disconnect them. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 33 Disconnect the FFC FPCB connector from the Main PBA. Remove the Camera and place it, lens side up, on the ESD Grounded Mat. ESD Gloves are required when handling the FFC. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 34 Disassembly Remove the Main PBA Screw Tool Required: Torque Screwdriver The Galaxy S20 FE Main PBA is held down by one (1) screw. Remove the screw from the Main PBA in order to remove the Main PBA from the OCTA.
  • Page 35 Remove the Main PBA Tool Required: Disassembly Stick Remove the Main PBA from the OCTA by inserting the Disassembly Stick where the FFC was; lift the Main PBA off the OCTA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 36 Tool Required: Disassembly Stick Disconnect the three (3) flex connectors that attach the Main Camera to the Main PBA. Gently lift the Main Camera to remove it from Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 37 Disassembly Remove the Optical Fingerprint FPCB Tool Required: Disassembly Stick Using the Disassembly Stick, disconnect the Optical Fingerprint Sensor FPCB, and place it to the side. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 38 Disassembly Remove the Main to Sub FPCB Tool Required: Disassembly Stick Disconnect the Main to Sub FPCB connector from the Sub PBA, and place it to the side. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 39 Disassembly Disconnect Remaining Connectors Tool Required: Disassembly Stick Disconnect the FPCB connector from the Sub PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 40 The white and red Coax cables must be disconnected from the Sub PBA. Insert the tip of the Tweezers underneath the base of each Coax connector and twist gently to disconnect them. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 41 Remove Assembly Antenna Tool Required: Disassembly Stick Remove the blue Coax cable from its channel. Using the Disassembly Stick, gently remove the Assembly Antenna, and place it to the side. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 42 Disassembly Remove Sub PBA Screw Tool Required: Torque Screwdriver Remove one (1) black Sub PBA screw. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 43 Disassembly Remove the Sub PBA Tool Required: Disassembly Stick Use the Disassembly Stick to remove the Sub PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 44 Vibrator Motor; nudge some more until it becomes loose enough to remove. TIP: Heating the device on the Hot Plate for a few minutes will help to loosen the Vibrator Motor tape. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 45 Using the Screwdriver, remove the two (2) black screws from the mmWave Antenna Module. Upon remove the screws, use the Metal Tipped Tweezers to remove the mmWave Antenna Module. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 46 Disassembly Remove mmWave Antenna Module 0 Tool Required: Metal Tipped Tweezers Use the Metal Tipped Tweezers to gently remove the top right mmWave Antenna Module. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 47 To remove the Battery, use the Swab to apply Alcohol around the edges of the Battery. Allow between 30-60 seconds for the Alcohol to dissolve the adhesive holding the Battery to the OCTA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 48 Remove the Battery – Part 2 Tools Required: Battery Absorber With the adhesive now loose, adhere the Battery Absorber to the center of the Battery; pull the Battery up and off the OCTA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 49 Disassembly Return the Lead to Samsung Tools Required: Ceramic Scissors Using the Ceramic Scissors, cut the lead from the Battery and return to Samsung per U-Class procedure. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

  • Page 50: Keep In Mind

    In a repair scenario, only remove as much as required for the repair • • Follow proper process and tool usage to avoid damage With the device disassembled, you can now move on to device assembly. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 51 Galaxy S20 FE Assembly SM-G781U Assembly Galaxy S20 FE Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 52 • 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 the Galaxy S20 FE to factory specifications. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 53 Screwdriver ESD Plastic Tweezers Disassembly Stick ESD Grounded Mat Anti-static Gloves Battery Press Pads ESD Wrist Strap WRT Kit Press Jig Fingerprint Jig and Model Pads Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 54 Assembly Rework Kits Galaxy S20 FE requires a Rework Kit, which includes the Tape required for assembly of the Battery Cover. GH81-19848A Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 55 Assembly Antenna o mmWave Antenna Models • Sub PBA • Optical Fingerprint Sensor • Main Camera • Main PBA o Front Facing Camera • Rear Assembly • Battery Cover Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 56 Insert the device in the Press Jig, and spin the Torque Wheel clockwise until it clicks; wait five seconds, then spin the Torque Wheel counterclockwise to release the pads and remove the device Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 57 Insert mmWave Antenna Module 1 and secure it in place by inserting two (2) black screws. Insert mmWave Antenna Module 0 and gently press it down to secure a fit. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 58 Vibrator Motor, the Motor MUST be replaced. If the adhesive of the Vibrator Motor is worn out, remove the worn tape, and attach new tape to the Vibrator Motor. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 59 Sub PBA make contact with the pads on the OCTA. Lower the rest of the Sub PBA into place, and ensure it is sitting flush. Insert the Optical Fingerprint Sensor and connect it to the Sub PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 60 Insert the Assembly Antenna and gently apply pressure to secure a fit. Insert the blue Coax cable into the side channel shown on the left side of the device. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 61 Assembly Install the RF Coax Cables and FPCBs Connect the Coax cables to the Sub PBA. Connect the Main to Sub FPCB and OCTA FPCB to the Sub PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 62 Assembly Insert the Sub PBA Screw Tool Required: Torque Screwdriver Insert one (1) screw for the Sub PBA Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 63 Main Camera to the Main PBA. Gently press on the connectors to ensure the Main Camera is connected to the Main PBA. Loose cables will result in communication failure with the Camera module. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 64 Gently lower the rest of the Main PBA so that it sits flush on the OCTA. If the Main PBA is not sitting flush, check to make sure that the SIM Ejector Pin is not blocking the Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 65 Once Main PBA is inserted, connect the Coax cables. Press down on each Coax cable to attach it to its connector on the Main PBA. A “click” sound will notify you of a complete connection. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 66 Connect the mmWave Antenna Module connectors and Main to SUB connector to the Main PBA. Make certain the connections are secure. A loose connection can cause other components to fail. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 67 Connect the FFC connector to the Main PBA and gently press down to secure a connection. A loose connection will prevent the FFC from communicating with the Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 68 Assembly Insert the Main PBA Screw Tool Required: Torque Screwdriver Insert 1 screw for the Main PBA. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 69 Antenna connector, and a firm connection to the board is made. A loose connection will prevent the device from powering on when it is not connected to an external power source. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 70 Finish by inserting the top piece and making sure the top is sitting flush. Perform a quick inspection to ensure nothing is sticking out. The Rear Assembly must sit flat, with no gaps or uneven spaces. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 71 Assembly Install Rear Assembly (Top) Tool Required: Torque Screwdriver Torque Value: 1.25kgf Insert 16 brand new screws. Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 72 Tape by hand and attach it to the Rear Assembly. Attach the Battery Cover to the OCTA and gently press the edges with your thumbs to secure a fit Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 73 There should be no gaps or overlaps between the OCTA and the Battery Cover Press the device in the Press Jig: • Place the Galaxy S20 FE in its Press Pad and insert into the Press Jig • Using the Large 1N Torque Wheel, press the device for one (1) minute Confidential Property of Samsung Electronics America, Inc.
  • Page 74 Galaxy S20 FE requires the following calibration: • TSP Calibration Speaker Calibration • Water Resistance Test • Optical Finger Calibration (Requires Calibration Jig) • mmWave RF Calibration • Multi Camera Calibration • Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 75 Return the device in the following condition: • Updated with the most recent firmware build • State of charge at 100% • Wiped clean using microfiber cloth to remove any fingerprints or debris Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.
  • Page 76 Thank you Confidential Property of Samsung Electronics America, Inc. For Internal Use Only.

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