LG RN7 Service Manual
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LG RN7 Service Manual

Mini hi-fi audio
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Mini Hi-Fi Audio
SERVICE MANUAL
MODEL: RN7
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN30014624
MARCH, 2020
"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 © 2020 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 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 3: Table Of Contents

    1. MAIN MCS PROGRAM (MAIN MCS CHIP) 2. MICOM PROGRAM 3. OPTION & EQ PROGRAM FOTA UPDATE STEP USING BT APP ......................1-9 SPECIFICATIONS ............................1-11 Copyright © 2020 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 © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 6: Hidden Key Mode

    - Entrance Key : Front ‘Stop’ + Remote Control Key ‘ ‘ for 5s. - Exit Key : Auto exit. - Explanation : ‘E2P CLR’ is displayed on the VPD and turn off the power automatically. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 7: Program Download Guide

    2) Copy Firmware file to USB device. NO USB   Insert USB device into USB1 port at USB1 function. SEARCH  MAIN FIRMWARE  FINISH  Auto POWER OFF Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 8: Micom Program

    2) Copy Firmware file to USB device. NO USB   Insert USB device into USB1 port at USB1 function. SEARCH  MICOM UP  FINISH  Auto POWER OFF Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 9: Option & Eq Program

    Download program file name must be OPTEQ_RNx_HAC_YYMMDDX.BIN (*RNx : “RN9”, “RN7” or “RN5”, depends on model option.) If security program(Water Wall) is activated on PC, you must save the file to the USB storage device and disable the security software, then download the file to your set.

  • Page 10: Fota Update Step Using Bt App

    Step4 : Confi rm update When touch the “Update” button, user could Select the OK button on the caution message. update the SET fi rmware using FOTA. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 11 When fi nishing the fl ash memory writing, pop-up phone, the SET overwrite the fi rmware to fl ash message about fi nish is displayed and the SET memory. auto power off. 1-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 12: Specifications

    32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz Available Digital Input Audio format Dolby Audio, PCM  Design and specifications are subject to change without notice. 1-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 13 1-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 14 DISASSEMBLY INSTRUCTIONS ........................2-2 MD FFC INSERTION GUIDE ........................... 2-10 EXPLODED VIEWS ............................2-11 1. CABINET AND MAIN FRAME SECTION ....................2-11 2. PACKING ACCESSORY SECTION ....................... 2-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 15: Disassembly Instructions

    Figure 1. Panel Side L/R disassembly - 1 2) Disassemble each of the 2 screws located inside the handle. Figure 2. Panel Side L/R disassembly - 2 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 16 3) Pull out Cover Side Assembly L/R in the backward direction. Figure 3. Panel Side L/R disassembly - 3 4) Remove the 3 screws. Figure 4. Panel Top disassembly - 1 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 17 6) As shown in the fi gure, remove the Panel Top by pushing the front part and lifting the rear part. Figure 6. Panel Top disassembly - 3 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 18 Figure 7. Panel Rear disassembly 8) Bracket MD + Frame Main Screw 7 EA Disassembly. Used Long length Driver (300mm more than) Figure 8. Main Set disassembly - 1 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 19 9) Remove the IR Receiver & Speaker LED Connector / Speaker Network cable. Figure 9. Main Set disassembly - 2 10) Power Cable Disconnection Figure 10. Main Set disassembly - 3 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 20 11) Grasp both sides and pull upward to remove the assembly. Figure 11. Main Set disassembly - 4 12) Complete removal of the Main Set. Figure 12. After detaching the Main Set Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 21 Disassemble the FFC cable before disassembling the top cover. When assembling the top cover, connect the FFC cable after assembling. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 22 4) You can remove the front panel by releasing the upper 2 hooks and the 4 left and right hooks and releasing the lower 4 hooks. Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 23: Md Ffc Insertion Guide

    FFC Cable_Pick UP FFC Cable_Loading Connector_ Loading A : FFC Cable Line B : Connector Connector_Pick Up Case 1 : OK Case 2 : NG 2-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 24: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION CABLE9 CABLE1 MAIN CNT803 SMPS CABLE3 2-11 2-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 25 CABLE1 EAD60718903 Cable,FFC 16P125D-H02-1F01A-N 140 140MM CABLE3 EAD62130037 Cable,FFC 10P010D-H2-1F00A-T-200-0-0-0-0 CABLE9 EAD65648201 Harness,Single 12507WS-H12G to 12507WS-H12G 80mm CNT803 EAD42004424 Harness,Single HS-LG16-020 12005HOO-08PL 2200 2-13 2-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 26: Packing Accessory Section

    2. PACKING ACCESSORY SECTION 300 Power Cable 825 FM Wire Antenna 900 Remote Control 2-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 27 DESCRIPTION SPECIFICATION REMARKS EAD64108401 Power Cord DE-2P-AN-PA-1500-N-00-BK-EU/RU EAA65845801 Antenna,T SN190379 SINGLE 0DB 50OHM 3 1. AKB75815318 Remote Controller Assembly MA2 RM9/7/5 (EU/DAB+) CD MINI 2-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 28 2. MAIN P.C.BOARD DIAGRAM ......................3-41 3. TOP KEY P.C.BOARD DIAGRAM ......................3-45 4. LIGHTING LED P.C.BOARD DIAGRAM ....................3-49 5. DAB MODULE P.C.BOARD DIAGRAM ....................3-49 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 29: One Point Repair Guide

    ON5/ RN5 : GBL08 ON7/ RN7 : 5 A (Red) ON7/ RN7/ ON9/ RN9 : GBU606G or RBU605M ON9/ RN9 : 8 A (Green) Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 30 Replace it with a new one. (Please replace 2 FET at the same time although several FET is OK) * RN9 : Q901 + Q902 * RN7/ RN5 : Q901 Only. 1-2-3. Service hint (Any picture/ Remark) < SMPS circuit > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 31: Booting When Power On The Set

    C 2 4 6 C 1 0 3 C 2 C 1 2019.12.13 C N 1 0 1 146 (220X125) EAX69094501 VER1.4 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 32: Vfd Is Not Displayed When Power On The Set

    No VFD : VFD 12 V will be not supply (Check Q205). 3-1-3. Service hint (Any picture / Remark) about 12Vp- p CN804 Base < CN804 > < Waveform of the grid current driver> Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 33: Booting In Usb Function

    I C 2 0 8 Z D 2 0 3 R 2 1 4 C N 1 0 1 < MAIN board top view > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 34 R 5 B 6 0 C 5 E 3 R 5 B 5 6 IC501 X500 < MAIN board top view > < Signal waveform > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 35 R 5 B 8 0 R 5 B 7 8 R 5 B 8 3 R 5 0 6 < MAIN board bottom view > < Signal waveform > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 36 R 5 B 3 C 5 5 6 C 5 0 4 R 5 B 3 9 < MAIN board bottom view > < Signal waveform > Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 37: Sound

    R 7 4 3 R 7 4 0 R 7 4 2 R 7 3 9 L 2 0 5 < MAIN board top view > 3-10 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 38 F L 5 0 0 B 6 1 B 6 0 C 5 E 3 B 5 6 IC501 < MAIN board top view > 3-11 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 39 C 5 B 3 6 0 9 C 3 8 2 < TUNER function signal fl ow > < MAIN board bottom view > 3-12 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 40 C 5 B 3 C 2 C 1 1 C 3 8 2 < MAIN board top view > < MAIN board bottom view > 3-13 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 41 C 5 2 4 C 5 3 2 C 5 2 2 C 5 1 4 < Bluetooth function signal fl ow > < MAIN board top view > 3-14 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 42 R 6 1 1 R 7 1 0 R 7 2 3 < OPTICAL function signal fl ow > < MAIN board top view > 3-15 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 43: Electrical Troubleshooting Guide

    Is there about 2.5 V at Replace IC941. IC941 pin1? D951 normal? Replace D951. ZD932 normal? Replace ZD932. Power line of main PCB is short. 3-16 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 44 Q901 normal? Replace Q901. D951 normal? Replace D951. Is there about 2.5 V Replace IC951. at IC951 pin1? Power line of main PCB is short. 3-17 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 45 VFD_12V is normal? VCC_5V is normal? Check or replace L105, L211. VFD_CLK, STB, DO is normal? Check or replace RT810, RT811, RT812. Check or replace VFD. 3-18 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 46: Mcs Part Check

    3.3 VA & 1.2 VA output. Check if IC204 Check and change IC204. have DVCC_3.3V output. X501: 32.768 kHz, X500: 24 MHz Check the operation. 3-19 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 47: Pwm Modulation Check

    Check IC601 Check each line resistor output. input data. Check PWM modulator output Replace IC601. Check IC601. FL: Pin48(-),49(+). FR: Pin46(-),47(+). Other output check. 3-20 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 48: Power Amp Part Check

    Check PWM modulator input IC701 pin5, 6, 14, 15. Check IC701, IC702 pin27, 28, 32, 35, 39, 40. Replace the coil. Check output line coil. 3-21 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 49: Tuner / Dab Function Check

    Check Check IC301 Pin8: ADC_3.3V Check CN201 pin11, 12: 12 V. IC301 pin18 Pin13, 14: DVCC_3.3V. output data. IC501 output data. Replace IC501. 3-22 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 50: Tuner Function Check

    Check tuner IC(IC302) Check tuner IC302 operation. voltage (Pin11:AVCC_3.3V). Check IC301 Pin27, 28. Check tuner data line R & C. Refer to function check. 3-23 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 51: Double Usb Function

    Check IC501 Display “NO FILE”. Replace IC501. (pin U7, U8/ A7, A8). Check USB audio file in USB device (MP3, WMA file is playable) 3-24 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 52: Waveforms Of Major Check Point

    Fig 1-1. X501: Crystal of RTC 32.768 MHz Fig 1-2. X500: Crystal of system 24 MHz (R5B94 both side) (MAIN DSP : R5B6, C5B5) 3-25 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 53: Sdram (Ic502)

    2. SDRAM (IC502) Fig 2. SDRAM 3-26 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 54: Servo (Ic401)

    3. SERVO (IC401) X X I Fig 3-2. CD-16M Fig 3-1. X400: Crystal 16.9344 MHz (IC401 pin31) 3-27 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 55: Motor Driver (Ic400)

    (IC400 Pin11, 12) for Driving TRAY Motor (IC400 Pin6, 7, 9, 10) Fig 4-3. SP- & SP+ for Driving SPINDLE Motor (IC400 Pin17, 18) 3-28 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 56: Adc (Ic301)

    5. ADC (IC301) 6. USB (CN502) Fig 5. ADC I2S Fig 6. USB D+/D- (IC301 Pin15, 16, 17) (CN502 Pin1, 2, 7, 8) 3-29 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 57: Bluetooth (Cn504)

    7. BLUETOOTH (CN504) B B T_TX BT_TX BT_TX BT_RX BT_RX BT_RX BT_RST BT_RST BT_RST Fig 7. BT_TX / BT_RX / BT_RST 3-30 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 58: Wiring Diagram

    UP LED 8pin Speaker DN LED Micom [ON9 only] CN102 Power 16pin CN504 16pin CN201 10pin 12pin 10pin 12pin TOP Control Board SMPS 3-31 3-32 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 59: Block Diagram

    ON5 series TW_L Key (26) ( 48Pin) 8Ω (3’’) Multi Speaker TW_R Lighting 8Ω (3’’) TOP Block Woofer 3Ω(8’’) ON9 Series only (NEW IC/BLOCK) 3-33 3-34 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 60: Circuit Voltage Chart

    GVDD, VDD : 10.8 ~ 13.2 V GVDD, VDD : 12 V GVDD, VDD : 12 V CT802 47 uF 5.10 5.10 VCC_5V 3-35 3-36 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 61: Connector Voltage

    12.10 DGND P_CTRL DGND MAIN DGND CN201  CN901 DGND SMPS PVDD 53.30 53.30 PVDD 53.30 53.30 PVDD 53.30 53.30 DGND PVDD CTRL 3-37 3-38 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 62: Printed Circuit Board Diagrams

    1. SMPS P.C.BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-39 3-40 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 63: Main P.c.board Diagram

    2019.12.13 C N 1 0 1 T P 1 4 8 FR4-2L 1.6T 220X146 (220X125) EAX69094501 VER1.4 CN102 T P 1 5 0 3-41 3-42 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 64 ON9/7/5 Main BOARD 2019.12.13 T P 1 1 6 FR4-2L 1.6T 220X146 (220X125) EAX69094501 VER1.4 T P 1 1 0 T P 1 0 7 3-43 3-44 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.
  • Page 65 3. TOP KEY P.C.BOARD DIAGRAM (TOP VIEW) 3-45 3-46 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 66: Top Key P.c.board Diagram

    TOP KEY P.C.BOARD DIAGRAM (BOTTOM VIEW) ON9/7/5 TOP KEY EAX69075201 VER 1.4 2019.12.16 PCB SIZE:280X185.5 (175.5) FR-1[1.6T] 3-47 3-48 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

  • Page 67: Lighting Led P.c.board Diagram

    C N 3 3 . 3 V G N D M I S O C L K A _ R A _ L 3-49 3-50 Copyright © 2020 LG Electronics Inc. All rights reserved. Only for training and service purposes.

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