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LG SJ7 Service Manual

LG SJ7 Service Manual

Wireless sound bar
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CONFIDENTIAL
Wireless Sound Bar
SERVICE MANUAL
MODEL: SJ7
(SJ7, SJ7-C, SPJ8B-W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN78037574
JULY, 2017
Copyright © 2017 LG Electronics Inc. All rights reserved.
Only for training and service purposes.

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  • Page 1 Wireless Sound Bar SERVICE MANUAL MODEL: SJ7 (SJ7, SJ7-C, SPJ8B-W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN78037574 JULY, 2017 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..WIRELESS SUBWOOFER PART Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    PAIRING GUIDE ..............................1-5 SECONDARY UNIT CONNECTION ........................1-6 WIRELESS SUBWOOFER CONNECTION ....................... 1-7 HIDDEN KEY MODE ............................1-8 FIRMWARE UPDATE GUIDE ........................... 1-9 SPECIFICATIONS ............................1-14 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 4: Esd Precautions

    ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 5: Name Of Each Component

    D DC IN : USB (SERVICE ONLY) : USB (SERVICE ONLY) : DC IN : PAIRING : B HDMI IN / OUT (TV ARC) : E Battery LED Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Pairing Guide

    5) Turn on the Primary unit to be paired. 6) If Pairing is completed. The white LED on the front of Secondary unit turns on. 7) Pair other SETS in the same way. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Secondary Unit Connection

    - White LED on the front of Secondary unit turns on. Note : If the connection is failed or disconnected, the LED indicator turns on red. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: Wireless Subwoofer Connection

    2. Turn on the Primary unit. 3. Pairing is completed. - The green LED on the rear of the wireless subwoofer turns on. Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Hidden Key Mode

    Turn on the Secondary unit by switching the usage mode switch to SOUND BAR. USB Mode Press “PLAY/PAUSE” key for 3secs to change USB function. Battery LED : Blink with amber color Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 10: Firmware Update Guide

    If any module of primary unit is updated <USB Memory> Necessary <Android Device> “Version Check APP” must be installed If any module of secondary unit is updated Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 00 Step 6. Verify the function has changed to USB with to 100. VFD display. Step 9. SJ7 primary unit will be off automatically after update fi nish. Step 10. Power on SJ7 primary unit again. 1-10 Copyright ©...
  • Page 12 • Version Check Hidden Key : Press Set “Vol-” + RCU “Play/Pause” for 3secs. Step 12. SJ7 shows the version of all modules in the order shown below. Compare the version VFD shows and you updated.  The order that SJ7 primary shows version in version check hidden mode MICOM ...
  • Page 13 SJ7_161227_Ver173013_0x82fc_ Rear Rx RX*.BIN CHECKSUM_2B82.BIN Step 2. Copy all updated SJ7 secondary binaries to USB memory. Step 3. Plug in the power cord and connect the power cord to SJ7 secondary unit. Step 8. Battery LED blinks with green color while up- date is in progress.
  • Page 14 Step 4. VFD scrolls “SUB-WF RESET” if wireless reset was successfully completed. It means that 2 wireless connections, “primary-secondary”, “primary-subwoofer” have reset successfully. SUB-W F RESET 1-13 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: Specifications

    Subwoofer 160 W RMS (3 Ω at 80 Hz, THD 10%) (80 W RMS : in state of disconnecting AC Adapter from Secondary unit) 1-14 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 Total 30 W RMS x 1 (8 Ω at 1 kHz, THD 10%) • Designs and specifications are subject to change without prior notice. 1-15 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 1-16 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 EXPLODED VIEWS ............................2-15 1. PRIMARY UNIT SECTION ........................2-15 2. SECONDARY UNIT SECTION ....................... 2-17 3. WIRELESS SUBWOOFER SECTION ....................2-19 4. PACKING ACCESSORY SECTION ....................... 2-21 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 19: Disassembly Instructions

    1. HOW TO DISASSEMBLE THE PRIMARY UNIT 1-1. Case Main Assembly 1) Remove the 8 screws. 2) Remove the Case Main Assembly. Case Main Assembly Figure 1-1 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 1-3. Front PCB Assembly 1) Disconnect the FFC cable from the Front PCB. 2) Remove the screw. 3) Remove the Front PCB Assembly. Front PCB Figure 1-3 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 [ NG-2 ] [ OK ] [NG-1] Do not overlap SPK Core. It touch with Case Main Assembly. [NG-2] Do not hide screw hole. Figure 1-4 (1) Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 1-5. Jack PCB Assembly 1) Remove the 2 screws. 2) Remove the Jack PCB Assembly. 3) Disconnect the harness cable from Jack PCB. Jack PCB Figure 1-5 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 23 4) Remove the WIRELESS module (5G). 5) Disconnect the FFC cable from the WIRELESS module (SMSC). 6) Remove the WIRELESS module (SMSC). WIRELESS (5G) WIRELESS (SMSC) Figure 1-7 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 24: How To Disassemble The Secondary Unit

    2. HOW TO DISASSEMBLE THE SECONDARY UNIT 2-1. Case Main Assembly 1) Remove the 8 screws. 2) Remove the Case Main Assembly. Case Main Assembly Figure 2-1 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 2-3. Front PCB Assembly 1) Disconnect the FFC cable from the Front LED PCB. 2) Remove the screw. 3) Remove the Front LED PCB Assembly. Figure 2-3 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 26 HOW TO DISASSEMBLE THE SECONDARY UNIT 2-4. Slide Assembly 1) Remove the 2 screws. 2) Remove the Slide Assembly. Figure 2-4 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 1) Disconnect the 6 cables from the Main PCB. FRONT BATTERY Figure 2-5 (1) 2) Remove the 2 screws. 3) Remove the Main PCB Assembly. Figure 2-5 (2) 2-10 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 2) Remove the WIRELESS module (SMSC). 3) Disconnect the FFC cable from the BT module. 4) Remove the BT module. WIRELESS (SMSC) Figure 2-8 2-11 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 29 1) Remove the 13 screws. Figure 3-1 (1) 2) Pull out the Rear Panel Assembly and disconnect the SPK cable. Rear Panel Assembly SPK cable Figure 3-1 (2) 2-12 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 30: How To Disassemble The Subwoofer

    2) Assemble the WIRELESS module into the wireless holder. 3) Attach the EVA sheet (0.15T) to the WIRELESS module. 4) Connect the FFC cable. Figure 3-2 (2) 2-13 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 31 1) Disconnect the Power inlet socket cable. AMP+SMPS PCB Assembly Figure 3-3 (1) 2) Remove the 5 screws. 3) Remove the AMP+SMPS PCB Assembly. AMP+SMPS PCB Assembly Figure 3-3 (2) 2-14 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Exploded Views

    A80M WIRELESS A41M JACK CHAMBER SHEET ATTACHING GUIDE A48M CABLE2 A43M FRONT CABLE1 Attaching [ TOP ] Guide Line LCD01 [ BOTTOM ] 2-15 2-16 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 33: Secondary Unit Section

    MAIN SLAVE A44S A52S A80S A41S CHAMBER SHEET ATTACHING GUIDE A43S CABLE6 A55S CABLE9 [ TOP ] Attaching Guide Line [ BOTTOM ] 2-17 2-18 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 34: Wireless Subwoofer Section

    3. WIRELESS SUBWOOFER SECTION A900 A900W A45W A54W 300W 2-19 2-20 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 35: Packing Accessory Section

    837 Stand 829 Cable tie 826 Filter (Ferrite Core) 803 Packing, Main 804M Bag, Primary unit 804S Bag, Secondary unit 802 Box, Master 2-21 2-22 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 2. CAPACITOR VOLTAGE ........................3-27 3. CONNECTOR VOLTAGE ........................3-29 PRINTED CIRCUIT BOARD DIAGRAMS ....................... 3-31 1. PRIMARY UNIT ............................ 3-31 2. SECONDARY UNIT ..........................3-37 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 37: Wiring Diagram

    WIRING DIAGRAM Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 38: Block Diagrams

    BLOCK DIAGRAMS 1. PRIMARY BLOCK DIAGRAM Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 39: Secondary Block Diagram

    2. SECONDARY BLOCK DIAGRAM Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 40: One Point Repair Guide

    1-1-3. Service hint (Any picture / Remark)       L201 L201 IC200 IC200   < MAIN board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 41: Primary Unit

    3) If 5.1 VA is OK, replace FRONT board. 1-2-3. Service hint (Any picture / Remark)   IC301 IC301 L301 L301   < MAIN board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 3) If 3.3 VA, 5 V OK, replace FRONT board. 1-3-3. Service hint (Any picture / Remark)     CN103 CN103     < MAIN board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 43 MAIN board. If no signal, please replace MAIN board. 2-1-3. Service hint (Any picture / Remark)   CN102 CN102 CN102 CN102   < MAIN board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 3) If signal is abnormal, replace JACK board. 2-2-3. Service hint (Any picture / Remark)       JK201 JK201   < JACK board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 2) If soldering status and 5.1 VA are abnormal, replace MAIN board. 2-3-3. Service hint (Any picture / Remark)     IC308 IC308 < MAIN board bottom view > 3-10 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 46 3) If PWM IC out is ok and speaker out (FL+/-, FR+/-) has DC Voltage, Replace MAIN board. 3-1-3. Service hint (Any picture / Remark) R646 R646 R647 R647 R648 R648 R649 R649 CN703 CN703 < MAIN board top view > 3-11 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 47 4) If check point 1), 2), 3) is ok MAIN board. 3-2-3. Service hint (Any picture / Remark) IC701 IC701 < MAIN board bottom view > 3-12 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 48 1) Check voltage 12 V of IC701 at pin1 ~ 2, If 12 V has problem refer to STEP 1-1. 2) If 12V is OK, replace MAIN board. 3-3-3. Service hint (Any picture / Remark) IC701 IC701 < MAIN board bottom view > 3-13 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Secondary Unit

    1-3. Service hint (Any picture / Remark)   IC902 IC902       IC902 IC902 < MAIN board bottom view > 3-14 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 50 3) If 15VB_25VA is NG, replace MAIN board. 2-3. Service hint (Any picture / Remark)       R953 R953   < MAIN board bottom view > 3-15 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 51 3) If KEY board is OK, replace MAIN board. 3-3. Service hint (Any picture / Remark)   CN100 CN100   CN100 CN100 < KEY board bottom view > 3-16 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 52 If no signal, please replace MAIN board. 4-3. Service hint (Any picture / Remark)   BLUETOOTH CN501 CN501 CN501 CN501   < MAIN board top view > 3-17 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: Waveforms Of Major Check Point

    1. PRIMARY UNIT 1-1. CRYSTAL FIG 1-1-1. X501 (27 MHz) FIG 1-1-2. X600 (24.576 MHz) 1-2. FLASH MEMORY FIG 1-2. VCC, CS#, CLK, DO 3-18 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 54: Primary Unit

    FIG 1-3-2. Press FUNC Key FIG 1-3-1. Press Power Key 0.424 ~ 0.485 V FIG 1-3-3. Press VOL - Key FIG 1-3-4. Press VOL + Key 3-19 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 55 “ Low” Timing 4.4 ms 3.6 ms ~ 5.04 ms “ High” Timing 4.48 ms 4.08 ms ~ 5.04 ms FIG 1-4-3. High Timing 3-20 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 56 PRIMARY UNIT 1-5. OPTICAL FIG 1-5-1. OPT_IN FIG 1-5-2. OPT_DET 11 12 3-21 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: Secondary Unit

    2. SECONDARY UNIT 2-1. CRYSTAL FIG 2-1. X500 (27 MHz) 2-2. FLASH MEMORY FIG 2-2. VCC, CS#, CLK, DO 3-22 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 58 FIG 2-3-2. Press FUNC Key FIG 2-3-1. Press Power Key 0.424 ~ 0.485 V FIG 2-3-3. Press VOL - Key FIG 2-3-4. Press VOL + Key 3-23 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 59 SECONDARY UNIT 2-4. AUDIO PWM FR+ FR- FL+ FL- 384.17 kHz 384.14 kHz FIG 2-4-1. Front L FIG 2-4-2. Front R 3-24 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 60: Circuit Voltage Chart

    -0.3 V ~ 8.5 V 7.8 V 4.2 V ~ 17 V 12.1 V IC803 DC,DC 125 °C 0.8 V ~ 10 V 5.17 V 3-25 3-26 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: Capacitor Voltage

    20.22 20.22 20.16 20.2 -55 ~ 105°C/2000HR WC924, WC925, WC926 Capacitor,AL,Radial 1000 uF/ 50 V 34.9 34.88 34.9 34.93 34.88 -55 ~ 105°C/2000HR 3-27 3-28 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Connector Voltage

    3.3 V (3.15 ~ 3.45 V) CN501 (SECONDARY <-> BT) Power MAIN BT module SPEC BT_3V3 3.35 V 3.31 V 3.3 V (3.15 ~ 3.45 V) 3-29 3-30 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 63: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. PRIMARY UNIT 1-1. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-31 3-32 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 PRIMARY UNIT 1-2. JACK P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 1-3. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-33 3-34 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 PRIMARY UNIT 1-4. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-35 3-36 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 66: Secondary Unit

    2. SECONDARY UNIT 2-1. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-37 3-38 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 67 SECONDARY UNIT 2-2. KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 2-3. POWER LED P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-39 3-40 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 68 6. LED ............................... 4-11 CIRCUIT VOLTAGE CHART ........................... 4-13 PRINTED CIRCUIT BOARD DIAGRAMS ....................... 4-15 1. WOOFER SMPS & AMP P. C. BOARD ....................4-15 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 69: Wiring Diagram

    WIRING DIAGRAM 2P, 3.96mm ST, Non Lock SMD Wireless 26P, 0.5mm ST, Non Lock SMD 2P, 3.96mm ST, Non Lock , SMD Power Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 70: Block Diagram

    BLOCK DIAGRAM Wireless LED (RED, GREEN) Wireless AMP_PDN AMP_SD PAIRING Reset KEY SW+/SW- PWM IC AMP IC Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 71: One Point Repair Guide

    If you can’t check 12 VA voltage, refer to the step 1-1. WL707 WL707 WIC705 WIC705 < Woofer SMPS & AMP board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 72 3) 1), 2) is NG  Replace WIC703. If you can’t check PVDD voltage, then replace the PCB board. WIC703 WIC703 < Woofer SMPS & AMP board bottom view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 73: Wireless Connection

     The main set and the wireless subwoofer are factory reset mode, then power on. WFB604 WFB604 Wireless module Wireless module Connection check Connection check < Woofer SMPS & AMP board top view > Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 74: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. CRYSTAL FIG 1. WX601 (24.576 MHz) 2. FLASH MEMORY FIG 2. VCC, CS#, CLK, DO Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 75: Voltage

    3. VOLTAGE FIG 3-2. Woofer 12 VA FIG 3-1. Woofer PVDD FIG 3-3. Woofer 3.3 VA FIG 3-4. Woofer 3.3V_PWM Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 76: Amp Voltage

    4. AMP VOLTAGE FIG 4-2. AMP_12V FIG 4-1. AMP PVDD Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 77: Pwm

    5. PWM FIG 5-2. Woofer PWM SW- Signal FIG 5-1. Woofer PWM SW+ Signal 4-10 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 78: Led

    6. LED FIG 6-2. Pairing On Status  Green LED FIG 6-1. Pairing Off Status  Red LED 4-11 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 79 4-12 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 80: Circuit Voltage Chart

    12.52 V 12.52 V 4.5 V ~ 17 V WIC705 DC,DC Converter VOUT: SW: #2 3.42 V 3.42 V 0.76 V ~ 7 V 4-13 4-14 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 81: Printed Circuit Board Diagrams

    1. WOOFER SMPS & AMP P. C. BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 4-15 4-16 Copyright © 2017 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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