LG SPM2 Service Manual
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LG SPM2 Service Manual

LG SPM2 Service Manual

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SERVICE MANUAL
MODEL: SPM2
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN30064773
APRIL, 2022
"Any reproduction, duplication, distribution (including by way of email, facsimile or other
electronic means), publication, modification, copying or transmission of this Service Manual is
STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics
entity from which you received this Service Manual. The material covered by this prohibition includes,
without limitation, any text, graphics or logos in this Service Manual."
Copyright © 2021-2022 LG Electronics Inc. All rights reserved.
Only for training and service purposes.

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  • Page 1 Service Manual is STRICTLY PROHIBITED unless you have obtained the prior written consent of the LG Electronics entity from which you received this Service Manual. The material covered by this prohibition includes, without limitation, any text, graphics or logos in this Service Manual.”...
  • Page 2 SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..CIRCUIT DIAGRAMS SECTION 5 ..REPLACEMENT PARTS LIST Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES HIDDEN KEY MODE ............................1-5 FIRMWARE UPDATE GUIDE ........................... 1-6 SPECIFICATIONS ............................. 1-9 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 4: Product Safety Servicing Guidelines For Audio Products

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

  • Page 5: Servicing Precautions

    Note 1: Accessible Conductive Parts include Metal panels, tricity sufficient to damage an ES device.) Input terminals, Earphone jacks,etc. Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Hidden Key Mode

    VOL- Cinema (OPTION) VOL- Cinema 3) Rebooting automatically after saving with the save (3s) (3s) EDIT key (Select) 4) LED3 indicates the current storage key. Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Firmware Update Guide

    USB update <Android Device> <RCU> “Music Flow Bluetooth” Necessary must be installed for FOTA update Caution : • Take care not to power off during update Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 8 Step 6. Update will start automatically. (Time required about 3 minutes) < SP2 VFD Display in Update > Step 7. SP2 main unit will be off automatically after update fi nish. (Enter Standby Mode) Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 9  Version is indicated by x.x, 1 digit is indicated by LED2, and 1 decimal place is indicated by LED3. Check out the color table below. <MCU> <HDMI> Remocon Left / Right KEY  Compare the version VFD shows and you updated. Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Specifications

    35 W RMS x 2 (Impedance: 6 Ω, THD 10 %) Built-in Subwoofer 30 W RMS (Impedance: 4 Ω, THD 10 %) • Designs and specifications are subject to change without prior notice. Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 1-10 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 12 3. HOW TO ASSEMBLE THE MAIN HOUSING ..................2-11 EXPLODED VIEWS ............................2-13 1. CABINET AND MAIN FRAME SECTION ....................2-13 2. PACKING ACCESSORY SECTION ....................... 2-17 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 13: Disassembly Instructions

    Step 2. Disassemble Red points Screw(CTB3+10GFZR) : 16 EA - 2 screws are hidden. (Yellow Point) Step 3. Disassemble the key PCB cord wire of Top Housing. (Blue Point) Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 14: How To Disassemble The Top Housing

    2. HOW TO DISASSEMBLE THE TOP HOUSING 2-1. DISASSEMBLE OF PASSIVE RADIATOR Disassemble Red points Screw(CTB3+10GFZR) : 8 EA 2-2. DISASSEMBLE OF KEY PCB Disassemble Red points Screw(CTB3+6GFZR) : 5 EA Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: How To Disassemble The Bottom Housing

    Step 1. Disassemble Red points Cord wire Jack : 5 Points Step 2. Disassemble Cord wire (Figure F) Figure C Figure D Figure A Figure B Figure E Figure F Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 Step 3: Lift up A part twice with weak force. At this point, the jack cover is completely disassembled. If it is not disassembled, repeat step 1 to 3. Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 HOW TO DISASSEMBLE THE BOTTOM HOUSING 3-6. DISASSEMBLE OF MAIN PCB Disassemble Red points Screw(CTB3+8GFZR) : 4 EA 3-7. DISASSEMBLE OF SPEAKER Disassemble Red points Screw(CTB3+10GFZR) : 12 EA Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 18: Assembly Instructions

    Assemble Red points Screw(CTB3+10GFZR) : 4 EA [Closing torque : 6.0 ± 0.5kgf.cm] Assemble Yellow points Screw(CTB3+8GFZR) : 4 EA [Closing torque : 6.0 ± 0.5kgf.cm] Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 Step 1. Assemble Red points Screw(CTB3+6GFZR, 2 EA) and connect jack. Step 2. Assemble the BT Module and connect jack. (It is glued with double-sided tape.) Step 1 Step 2 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 [Closing torque : 5.0 ± 0.5kgf.cm] Step 4. Connect the power line (red point). and insert the line into the groove. (Yellow point) Step 1 Step 2 Step 4 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 21: How To Disassemble The Top Housing

    [Closing torque : 5.0 ± 0.5kgf.cm] 2-2. ASSEMBLE OF PASSIVE RADIATOR Assemble Red points Screw(CTB3+10GFZR) : 8 EA [Closing torque : 6.0 ± 0.5kgf.cm] 2-10 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 22: How To Assemble The Main Housing

    Step 2. Assemble the Side cover L Step 3. Assemble Red points Screw(CTB3+8GFZR) : 4 EA [Closing torque : 4.0 ± 0.5kgf.cm] Step 3 Step 2 Step 1 2-11 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 2-12 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 24: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION A80L SMPS BUTTON BUTTON BUTTON MAIN CABLE3 BLUETOOTH BLUETOOTH BLUETOOTH CABLE1 CABLE2 A80R 2-13 2-14 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 CABLE1 COV36811201 FFC Cable,Outsourcing ANAM CWC4C4A10A060B08J01 FFC C CABLE2 COV36811101 HARNESS,Outsourcing ANAM CWBSP2CN101 HARNESS SP2 CABLE3 COV36811001 HARNESS,Outsourcing ANAM CWBSP2CN502 HARNESS SP2 S 2-15 2-16 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 26: Packing Accessory Section

    2. PACKING ACCESSORY SECTION 2-17 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 COV36809101 Bracket,Mount,Outsourcing anam bracket wall mount Bracke COV36809201 Screw,Outsourcing anam screw machine Screw screw COV36812901 Remote Controller,Outsourcing anam RCU RCU (LG P/no : AKB760 2-18 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 2. MAIN P. C. BOARD DIAGRAM ......................3-21 3. LED P. C. BOARD DIAGRAM ......................3-23 4. IR P. C. BOARD DIAGRAM ........................3-23 5. KEY P. C. BOARD DIAGRAM ......................3-25 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 29: Wiring Diagram

    WIRING DIAGRAM Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: Block Diagram

    BLOCK DIAGRAM Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: One Point Repair Guide

    L804 L806 220ohm /2200m A 220ohm /2200m A CKST 0603-10UH /M D GND L805 L805   IC801 IC801 < MAIN board top view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Booting When You Turn The Unit On, Standby Led Doesn't Work

    220ohm /2200m A MCL3730: 35mA Bluetooth: 35mA D GND IC804 IC804   L814 L814 < MAIN board top view > < MAIN board bottom view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 33 MCS_1V2 220ohm /2200m A 220ohm /2200m A 2.2uH /3.8A   D GND   L808 L808 IC802 IC802 < MAIN board top view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 34: Sound

    R119 BT _RX R110 R114 BT _T X R157 BT _SCL R158 BT _SD A D GND CN102 CN102 < MAIN board top view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 V CC JK101 D GND R150   D GND JK101 JK101   R150 R150   L109 L109 < MAIN board top view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 1K /500m A Play m usic via USB USB CURRENT LIMIT 500mA D GND D GND JK102 JK102   < MAIN board top view > Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 37 220ohm /2200m A 220ohm /2200m A R842   D GND   L812 L812   L817 L817 < MAIN board top view > 3-10 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 38: Protection Error

    AMP_RCH + OUT AMP_SW CH - OUT SW 4ohm AMP_SW CH + OUT CWBSP2CN502 D GND CN502 CN502 < MAIN board top view > 3-11 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 4) If check point 1), 2), 3) is ok, replace MAIN board. 3-2-3. Service hint (Any picture / Remark) IC502 IC502 IC501 IC501 < MAIN board top view > 3-12 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 40: Led Doesn't Work

    L128 600ohm /0.5A LED _SD B D GND         CN101 CN101 < MAIN board top view > 3-13 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 41: Waveforms Of Major Check Point

    X102 (24MHz) R154 24.576MH z X 101 D GND Fig 1-2. Crystal X101 (24.576 MHz) R406 D GND Fig 1-3. Crystal X401 (24 MHz) 3-14 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 42: Remote Control

    Low Timing RC651 O U T G N D 10V/0.1uF R653 C250 50V/0.01uF C251 BN101 D GND C653 TO IR SENSOR 50V/100pF RC_GND CN651 3-15 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 43: Optical

    91CR-1A-05-A002 RX (16MH z) RXIN7 RXIN6 V CC IC102 RXIN5 JK101 RXIN4 D GND RXIN3 R150 R163 RXIN2 R166 RXIN1 L111 VD D RX D GND 3-16 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 44: Circuit Voltage Chart

    DVDD : 3.28 V IC,Audio Amplifi er PVDD : 4.5 ~ 26 V PVDD : 20.1 V (CVIAD85050LG48NRR) IC601 IC,Driver LED 2.7~5.5 V 5.02 V (CVIIS31FL3206QFLS4) 3-17 3-18 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 45: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-19 3-20 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 46: Main P. C. Board Diagram

    2. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-21 3-22 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 47: Led P. C. Board Diagram

    3. LED P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. IR P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-23 3-24 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Key P. C. Board Diagram

    5. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-25 3-26 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 49 3-27 3-28 Copyright © 2022 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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