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LG MBD-K203Q Service Manual

Karaoke mini hi-fi system
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P/NO : AFN542679853
MARCH, 2008
KARAOKE MINI
Hi-Fi SYSTEM
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.
MODEL : MBD-K203Q (FBS203V)
Internal Use Only
Website http://biz.lgservice.com

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  • Page 1 Internal Use Only Website http://biz.lgservice.com KARAOKE MINI Hi-Fi SYSTEM SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN542679853 MARCH, 2008 MODEL : MBD-K203Q (FBS203V)
  • Page 2 • INTERNAL BLOCK DIAGRAM OF IC ................3-47 • CIRCUIT VOLTAGE CHART ....................3-63 • PRINTED CIRCUIT DIARGAMS ..................3-67 ❍ SECTION 4. REPLACEMENT PARTS LIST ..............4-1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 3: Section 1. General

    (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 4: Notes Regarding Compact Disc Player Repairs

    7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Armband Resistor (1 Mohm) Resistor Conductive (1 Mohm) Sheet Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 5: Safety Precautions

    THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 6 FLD ‘write ok’ Remote control ‘2’ + Front ‘STOP’ push same timing FLD display E2P CLR or EP CLR Auto power off Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 OPT D make changes OPT E OPT F OPT G Press pause key once Change will be applied when power OFF-->ON. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 8 1. When the USB device is inserted at the USB function a after a while TV screen is displayed on the as following figure. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 9 2. The message “Upgrade” is displayed while downloading. 3. The power is automatically turned off when downloading is completed. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 10 2. When downloading is completed, the message “Completed” is displayed at the top left of the TV screen as shown at Figure(1). If the message “NO USB” is displayed as shown at Figure(2), downloading is completed. FIG.2 FIG.1 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 7. When the power is turned on again, the language selection menu is initially displayed. After selecting the desired language, press the SELECT/ENTER. LGE Internal Use Only 1-10 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 12: Specifications

    165 X 341 X 261 mm Net Weight 4.48 kg Designs and specifications are subject to change without pior notice. Copyright © 2008 LG Electronics. Inc. All right reserved. 1-11 LGE Internal Use Only Only for training and service purposes...
  • Page 13 LGE Internal Use Only 1-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 14: Section 2. Exploded Views

    • CABINET AND MAIN FRAME SECTION TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. MAIN CABLE1 SMPS CABLE2 CABLE3 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 15: Deck Mechanism Exploded View

    DECK MECHANISM EXPLODED VIEW 1. DECK MECHANISM SECTION (DP-10) 015B 015A 012A 012A LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 16: Speaker Exploded View

    SPEAKER EXPLODED VIEW • FRONT SPEAKER (FBS203V) A80L A81L A80R A81R A81A 865L 865R Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 17: Packing Accessory View

    900 Remote Control 825 Antenna 801 Instruction Ass'y Micro Phone 832 DISC 801S Song Book 803 Packing 803 Packing 804 Bag 802 Box LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 18: Section 3. Electrical Part

    5V. KIA7042. KIA7042 Check IC100 Check if output voltage LC87F5NC8A 4 PIN of IC101 KIA7042 is power. 4.3V. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 19 14,55,89 PIN 5V Check the working condition Check the X100:32.768kHz Replace the related parts. related part. X101:9.8304MHz Replace the related parts. LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 20 Refer to micom 81 PIN DATA 82 PIN CLK Check MICOM power 5V troubleshooting. Check the related part. Replace the related parts. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 21: Fld Display Check

    Check Data output. 26PIN¡2PIN DO 28PIN¡1PIN CLK Check 26 PIN¡DO ¡DATA input. Replace the related part. Check the related part FLT light on? LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 22: Touchpad Check

    PIN power (3,10,22,29,39,47, 56,65,72,87,94)Check X701 2PIN 3.3V Check the Check if X701 Replace the related part. related part of 12.288MHz is working. X701. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 23 Check IC702 Check resistance PS9830 DATA input. output of each LINE. Check PWM MODULATOR output Check IC702 PS9830 part. FL:75(+)74(-) R:71(+)70(-) LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 24: Power Amp Part Check

    Check PWM MODULATOR input 4,6,14,16 PIN. Check POWER IC 700 34, 29,27,20 PIN output. Replace the related parts. Check output LINE COIL. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 25 4PIN 9V). Check IC201(CS5345) 26,27PIN input waveform. Check IC201(CS5345) Check IC201(CS5345) 5,14,30:5V 36,46,:3.3V 14PIN output waveform. Replace the related parts LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 26 If DC V is 6.1V. Check the DC V of C950,C951 Check short of P9701 line. If DC V is in 29V. Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 27 Check the JK3C1 13pin and 30pin line. Check the JK3C1 18pin, 19pin. OSD IPOD Check theJK3C1 18pin and 19pin line LGE Internal Use Only 3-10 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 28: Power Check Guide

    Does No DISC or Check the voltage Time are appeared at of each pin on PN102. FLD? Check DVD MD Module. Copyright © 2008 LG Electronics. Inc. All right reserved. 3-11 LGE Internal Use Only Only for training and service purposes...

  • Page 29: Test & Debug Flow

    Load+ & load- signals Pin on IC401. on PN4402 are OK? Check the cable connection between DVD PCB and MD (MECHA). LGE Internal Use Only 3-12 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 30 ES8390 and motor driver IC. to motor driver? Check the motor driver (IC401). Proper F+ & F-outputs? Check cable connection with pick-up head. Copyright © 2008 LG Electronics. Inc. All right reserved. 3-13 LGE Internal Use Only Only for training and service purposes...
  • Page 31 ES8390 Check the SPINDLE control of SPIN+&SPIN- output motor driver IC401. properly? Check the cable connection between PN4401 and MD. LGE Internal Use Only 3-14 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 32 T+ & T- output on motor driver (IC401). properly? Check cable connection on pick-up head. Check RF signal waveform. Disc play? Copyright © 2008 LG Electronics. Inc. All right reserved. 3-15 LGE Internal Use Only Only for training and service purposes...
  • Page 33 (Q501), Output of Video buffer TEST END ES8390 is OK? IC (IC507) and ES8390 video signal data. LGE Internal Use Only 3-16 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 34 Check the USB JACK POWER supply. Reading OK check. (Check PN205) Check the USB DATA LINE. (PN205) Check the ES8390. Check DATA LINE PIN 91(USB-No)90(USB-Po) Copyright © 2008 LG Electronics. Inc. All right reserved. 3-17 LGE Internal Use Only Only for training and service purposes...
  • Page 35 LGE Internal Use Only 3-18 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 36: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. WHEN POWER ON, RESET & DATA ETC WAVEFORM RESET(DVD) SPI_CS3 2. WHEN USB FUNCTION OPERATING IC501 Copyright © 2008 LG Electronics. Inc. All right reserved. 3-19 LGE Internal Use Only Only for training and service purposes...
  • Page 37 3. OPEN/CLOSE WAVEFORM AT POWER ON (OPEN AND CLOSE) OPEN(High/Low) CLOSE(Low/Low) IC501 4. STARTING ACTION WAVEFORM IN MD DEVICE (SLED HOME) SLO (from MPEG) SLED- IC501 SLED+ LGE Internal Use Only 3-20 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 38 FOCUS WAVEFORM (IN CASE OF CD-RW) FOCUS WAVEFORM (IN CASE OF DVD-RW) FOCUS WAVEFORM (IN CASE OF DVD5) IC501 IC501 Copyright © 2008 LG Electronics. Inc. All right reserved. 3-21 LGE Internal Use Only Only for training and service purposes...
  • Page 39 WHEN WE PUSH OPEN OR STOP KEY ,SPIDLE BREAK SIGNAL (SPNN &SPNP BE USED SPINDLE BREAK DIRECTION) SPNN SPNN IC501 IC501 LGE Internal Use Only 3-22 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 40 IC501 IC501 8. DVD & CD DISTINCTION IN CASE OF DVD 14MS (DISC SURFACE & DATA LAYER DISTANCE IS DIFFERENT) Copyright © 2008 LG Electronics. Inc. All right reserved. 3-23 LGE Internal Use Only Only for training and service purposes...

  • Page 41: At First Action, Focus Signal A,B,C,D

    9. AT FIRST ACTION, FOCUS SIGNAL A,B,C,D IC501 10. RF WAVEFORM (ANALOG SCOPE) LGE Internal Use Only 3-24 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 42: Wiring Diagram

    WIRING DIAGRAM Copyright © 2008 LG Electronics. Inc. All right reserved. 3-25 LGE Internal Use Only Only for training and service purposes...

  • Page 43: Block Diagram

    BLOCK DIAGRAM TAS53X2 TAS53X2 LGE Internal Use Only 3-26 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 44: Smps(Power) Circuit Diagram

    NOTE) Parts that are shaded are critical 2008.02.19 NOTE) With respect to risk of fire or NOTE) electricial shock. 3-27 3-28 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 45: Micom Circuit Diagram

    2. MICOM CIRCUIT DIAGRAM 2008.02.19 3-29 3-30 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 46: Mpeg Circuit Diagram

    3. MPEG CIRCUIT DIAGRAM 2008.02.19 3-31 3-32 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 47: Servo Circuit Diagram

    4. SERVO CIRCUIT DIAGRAM 2008.02.19 3-33 3-34 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 48: I/O Circuit Diagram

    5. I/O CIRCUIT DIAGRAM 2008.02.19 3-35 3-36 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 49: Amp Circuit Diagram

    6. AMP CIRCUIT DIAGRAM 2008.02.19 3-37 3-38 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 50: Scart Circuit Diagram

    7. SCART CIRCUIT DIAGRAM 2008.02.19 3-39 3-40 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 51: Front Circuit Diagram

    8. FRONT CIRCUIT DIAGRAM 2008.02.19 3-41 3-42 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 52 9. TOUCH KEY CIRCUIT DIAGRAM 2008.02.19 3-43 3-44 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...

  • Page 53: Mic Circuit Diagram

    10. MIC CIRCUIT DIAGRAM 2008.02.19 3-45 3-46 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 54 SCK/SCL Reset & Power Down Internal Controls Interface SI/I2C_AD0 PWM_SWL_P/M C, SPI) /CS/I2C_AD2 EPD_ENA EXT_MUTE Crystal Power Supply Oscillator OVERLOAD Copyright © 2008 LG Electronics. Inc. All right reserved. 3-47 LGE Internal Use Only Only for training and service purposes...

  • Page 55: Pin Descriptions

    User can set this sub-channel data input pins to PCM serial data output pins. See the Control Register Description part. Schmitt-Trigger input LGE Internal Use Only 3-48 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 56 Negative PWM output of headphone right channel. PWM_SWL_P Positive PWM output of subwoofer line output. PWM_SWL_M Negative PWM output of subwoofer line output. Copyright © 2008 LG Electronics. Inc. All right reserved. 3-49 LGE Internal Use Only Only for training and service purposes...

  • Page 57: Recommended Operating Conditions

    Output Capacitance (f = 1MHz, V = 0V) Low Level output current @Vol=0.4V 2mA 10.0 High Level output current @Voh=2.4V 2mA 11.9 LGE Internal Use Only 3-50 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 58: Pin Configuration

    • LC87F5NC8AVU 1) PIN CONFIGURATION Copyright © 2008 LG Electronics. Inc. All right reserved. 3-51 LGE Internal Use Only Only for training and service purposes...
  • Page 59 2) BIOCK DIAGRAM LGE Internal Use Only 3-52 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 60 3) PIN DESCRIPTIONS Copyright © 2008 LG Electronics. Inc. All right reserved. 3-53 LGE Internal Use Only Only for training and service purposes...
  • Page 61 LGE Internal Use Only 3-54 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 62 DMA8 AUX10/TSD[3] DMA9 AUX9/HSYNC/TXD2 DMA11 VD33 DMA3 VS33 DMA2 AUX8/VSYNC/RXD2 DMA1 SPDIF_OUT DMA0 SPDIF_IN DMA10 SPI_DO DRAS2# SPI_DI DRAS1# SPI_CLK Copyright © 2008 LG Electronics. Inc. All right reserved. 3-55 LGE Internal Use Only Only for training and service purposes...
  • Page 63 16, 48, 79, 124, 188 Core power supply. 200, 191, 138, 93, AUX2[6-0] Aux2 data I/O 6-0. 70, 41, 32 LGE Internal Use Only 3-56 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 64 Camera input 7. AUX3[6] Aux3 data I/O 6. CAMIN6 Camera input 6. AUX3[5] Aux3 data I/O 5. CAMIN5 Camera input 5. Copyright © 2008 LG Electronics. Inc. All right reserved. 3-57 LGE Internal Use Only Only for training and service purposes...
  • Page 65 Compensation input. YUV3 YUV pixel 3 output data. RSET DAC current adjustment resistor input. YUV4 YUV pixel 4 output data. LGE Internal Use Only 3-58 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 66 Signal supply voltage Adjustable regulator feed back DO3+ CH3 driver output(+) REGVCC Regulator supply voltage Adjustable regulator output DO3- CH3 driver output(-) Copyright © 2008 LG Electronics. Inc. All right reserved. 3-59 LGE Internal Use Only Only for training and service purposes...
  • Page 67 3) BIOCK DIAGRAM LGE Internal Use Only 3-60 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 68: Typical System Block Diagram

    35.5 V Hardwire Supply VREG OC Limit System Decoupling Power Supply Power Decoupling Supply GVDD (12 V)/VDD (12 V) 12 V Copyright © 2008 LG Electronics. Inc. All right reserved. 3-61 LGE Internal Use Only Only for training and service purposes...

  • Page 69: Functional Block Diagram

    Drive BTL/PBTLConfiguration Pulldown Resistor GND_B GVDD_A BST_A PVDD_A Gate PWM_A OUT_A Ctrl. Timing Rcv. Drive BTL/PBTLConfiguration Pulldown Resistor GND_A B0034-03 LGE Internal Use Only 3-62 Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 70: Circuit Voltage Chart

    0.001 0.002 3.44 0.001 0.29 0.02 0.01 3.44 0.002 1.79 1.71 3.35 3.37 0.21 0.02 1.71 1.71 0.02 0.01 3-63 3-64 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 71 0.039 1.38 IC508 0.68 3.42 -27.09 0.039 1.53 3.22 3.39 3.41 -21.75 5.03 3.47 3.22 0.87 4.95 -25.3 0.312 3-65 3-66 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 72: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW ) 3-67 3-68 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 73 MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 3-69 3-70 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 74: Smps P.c. Board Diagram

    2. SMPS P.C. BOARD DIAGRAM NOTE: Warning Parts that are shaded are critical With respect to risk of fire or electrical shock. 3-71 3-72 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 75 4. TOUCH KEY P.C. BOARD DIAGRAM ( TOP VIEW ) TOUCH KEY P.C. BOARD DIAGRAM ( BOTTOM VIEW ) SCART P.C. BOARD DIAGRAM ( BOTTOM VIEW ) 3-73 3-74 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 76: Front P.c. Board Diagram

    5. FRONT P.C. BOARD DIAGRAM 6. MIC P.C. BOARD DIAGRAM 3-75 3-76 Copyright © 2008 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 77 3-78 3-79 LGE Internal Use Only Copyright © 2008 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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