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LG MDD262 Service Manual

Karaoke mini home theater
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KARAOKE MINI
HOME THEATER
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
MODEL : MDD262(MDS262V)
P/NO : AFN32840846
FEBRUARY, 2007

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  Summary of Contents for LG MDD262

  • Page 1 KARAOKE MINI HOME THEATER SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL : MDD262(MDS262V) P/NO : AFN32840846 FEBRUARY, 2007...
  • Page 2: Table Of Contents

    CONTENTS SECTION 1 5. STR-S6757IF1905 ..........3-16 6. TAS5142.............3-17 GENERAL 7. U1739EJ2V1UD00/KF2_E .......3-18 SERVICING PRECAUTIONS ........1-2 WIRING DIAGRAM ............3-20 • NOTES REGARDING HANDLING OF THE PICK-UP BLOCK DIAGRAM.............3-22 • NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. SMPS BLOCK DIAGRAM.......3-22 ESD PRECAUTIONS ...........1-4 2.
  • Page 3: Servicing Precautions

    SECTION 1 GENERAL SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior to use. 2) The pick-up should never be subjected to external pressure or impact. 2.
  • Page 4: Notes Regarding Compact Disc Player Repairs

    NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.
  • Page 5: Esd Precautions

    ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called electrostatically sensitive devices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components. The following techniques should be used to help reduce the incidence of component damage caused by static electricity.
  • Page 6: Location Of Users Controls

    18.POWER CORD 10.• RECORD/RECORD PAUSE ( REC/ ) button 19.SPEAKER Connectors (MDT352 Model) • TUN.(-/+) buttons -AUTO TUNING / 20.SPEAKER Connectors (MDD262 Model) REWIND / FAST FORWARD ( ) -TAPE/ SCAN ( ) /TEMPO (-/+) buttons -CD • PRESET (-/+) buttons / TAPE REVERSE PLAY...
  • Page 7: Remote Control

    REMOTE CONTROL 1. POWER button 2. FUNCTION SELECT buttons (TUNER/BAND, DVD/KARAOKE, AUX, USB) 3. NUMERIC buttons (0-9) 4. TAPE FUNCTION buttons POWER POWER D.SKIP D.SKIP • REVERSE PLAY ( ) DVD/ DVD/ • PLAY ( ) TUNER/BAND TUNER/BAND KARAOKE KARAOKE •...
  • Page 8: Specifications

    Intermediate Frequency 450kHz Signal to Noise Ratio 30dB Frequency Response 140 ~ 1800Hz Output Power Front: 130W + 130W (4Ω, THD 10%)(MDD262) 100W + 100W (4Ω, THD 10%)(MDT352) Subwoofer: 150W (3Ω, THD 10%)(MDT 352) T.H.D 0.5% Frequency Response 42 ~ 20000Hz...
  • Page 9 MEMO...
  • Page 10: Cabinet And Main Frame Section

    SECTION 2 EXPLODED VIEWS CABINET AND MAIN FRAME SECTION CABLE4 MAIN P5701 CABLE2 CABLE3 P9701 FRONT SMPS CABLE5 P9702 CABLE1 CN201...
  • Page 11: Tape Deck Mechanism Exploded View

    TAPE DECK MECHANISM EXPLODED VIEW 1. TAPE DECK MECHANISM (A/R & A/S : RIGHT A/R DECK) BRASS MOTOR PULLEY MAYBE CHANGED FOR WOW FLUTTER WHEN NECESSARY RING FW MAYBE ADDED FOR WOW FLUTTER WHEN NECESSARY RING FW MAYBE ADDED FOR WOW FLUTTER WHEN NECESSARY...
  • Page 12: Tape Deck Mechanism (A/R & A/S : Left A/S Deck)

    2. TAPE DECK MECHANISM (A/R & A/S : LEFT A/S DECK) RING FW MAYBE ADDED FOR WOW FLUTTER WHEN NECESSARY...
  • Page 13: Dvd Mechanism Exploded View

    DVD MECHANISM EXPLODED VIEW 169A 169B 169C 012A 012A 012A 035A...
  • Page 14: Speaker Exploded View

    SPEAKER EXPLODED VIEW MODEL : MDS262V (FRONT SPEAKERS) A80BL A80BR A80L A80R A80A WIRE80 WIRE81 2-10...
  • Page 15 MEMO MEMO 2-11 2-12...
  • Page 16: Packing Accessory View

    PACKING ACCESSORY VIEW 2-13...
  • Page 17: Audio Part Electrical

    SECTION 3 AUDIO PART ELECTRICAL AUDIO ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER (SMPS) POWER (SMPS) Check the fuse Replace the fuse F901 Check the DC V of C905. Check BD901, LF901, 902 If DC V is over 400V Chcek the DC V of C909, C903, Replace IC 901,902 Check IC901, 902 C921 If DC V is in 14~19V...
  • Page 18: P-Sens

    2. P-SENS P-SENS Check the PIN6 of P9702 Check power circuit Trouble shooting If DC V is over 5.6V 3. VKK CHECK VKK check Check the PIN3 of P9702 Check power circuit Trouble shooting If DC V is over -28V ±2 4.
  • Page 19: Micom Part Check Ii

    5. MICOM PART CHECK II MICOM part check II Check if Refer to voltage of P7904_PIN5 SMPS troubleshooting. is 5.6V. Check Check if output of both end voltage of D101(1SR35) is 5V. D101 Replace D101. Check D101. Check Check if output of IC101 Check Q102_base Q101_ emitter/collector (KIA7042) is over 4.3V.
  • Page 20: Ic103(Ks4Cd21Cs) Check

    6. IC103(KS4CD21CS) CHECK Check IC100(78KOKF2)_ PIN 22, 24 Refer to PIN22 Check micom micom troubleshooting DATA PIN24 CLK voltage 5V. Replace micom. Check micom.
  • Page 21: Fld Display Check

    7. FLD DISPLAY CHECK FLD display check Check Refer to SMPS P7904_PIN1, 2, 3 voltage input. Check if both end votage of F1, F2 are over 3.7V. VKK : over 26V. Check P3702 connection and power. Check P3702 connection. Pin1 : FL-22 Pin2 : FL+26 Pin3 : VKK- over 26V.
  • Page 22: Pwm Modulation Part Check

    8. PWM MODULATION PART CHECK PWM modulation part check Refer to P7905_PIN9 SMPS troubleshooting. 3.3V checking Check X601 Replace X601. Check IC604(PS9829) 12.288MHz. VDD PIN voltage(3, 7, 8, 10, 22, 29, 39, 47, 56, 65, 72, 94). Check X601_PIN2 3.3V. Check Check FB614 Check IC605_...
  • Page 23: Power Amp Part Check

    9. POWER AMP PART CHECK Power AMP part check P7905_3PIN : +12V, Refer to SMPS troubleshooting. PIN13, 14, 15 : 35V. Check each IC700, 701, 702, 703 PIN21, 26, 29, 34 input voltage. Check each Check each LINE registor output voltage. IC700, 701, 702, 703 IC700 : R701, 702, 726, 727 PIN1,17, 18, 19, 36 +12V...
  • Page 24: Aux Function Check

    10. AUX FUNCTION CHECK AUX function check Check JK800 connection. Check Check IC200(BU4052)_ Check µ-COM(IC301)_ IC200(BU4052)_PIN16 PIN4, 11 input PIN83, 84 commucation. VDD, PIN8 VSS waveform. power. Replace IC200 Check IC200(BU4052)_ PIN3, 13 output waveform. Check Check Refer to IC801(MC4580)_PIN4 IC801(MC4580)_PIN 2, 6 SMPS troubleshooting.
  • Page 25: Tuner Function Check

    11. TUNER FUNCTION CHECK TUNER function check Check TUNER Check TUNER module voltage(PIN2 : 9V). module(TU601) operation. Check IC200(BU4052)_PIN1, 12 input waveform. Check IC200(BU4052)_PIN3, 13 Check IC200(BU4052)_ output waveform and IC601 PIN16 VDD, PIN8 VSS power. (BU4052)_PIN2,15 input waveform. Replace IC200. Replace IC200.
  • Page 26: Tape Function Check

    12. TAPE FUNCTION CHECK TAPE function check TAPE PCB ASS`Y Check Check IC200(BU4052)_ IC200(BU4052)_PIN2, 15 input PIN16 VDD, PIN8 VSS power waveform. Replace IC200. Replace IC200. Check IC200(BU4052)_PIN3, 13 output waveform and IC601(BU4052)_ PIN2, 15 input waveform. Check IC200(BU4052)_ Check IC801(MC4580)_ PIN16 VDD, PIN8 VSS power PIN2, 6 input waveform.
  • Page 27: Tape Play Part Check

    13. TAPE PLAY PART CHECK TAPE PALY part check Check Refer to IC201(HA12237)_PIN16 SMPS troubleshooting. 12V input. Check IC201_ Replace head wire and tape Check A/B PIN5, 26 signal deck mechanism. deck head input. output. Check A deck head input IC201_PIN32, 39 and B deck head input IC201_PIN34, 37.
  • Page 28: Tape Rec Part Check

    14. TAPE REC PART CHECK TAPE REC part check Check Refer to PWM IC604(PS9829)_PIN49, 52 modulation troubleshooting. PWM output. Check IC201_ PIN7, 24 record input. Check IC201_ Check IC100_PIN23 Replace IC201. PIN10, 21 output. "HIGH" Check Q205(D1304)_ Check L203_PIN2, 3 Check IC100_PIN23 "HIGH"...
  • Page 29: Internal Block Diagram Of Ics

    INTERNAL BLOCK DIAGRAM OF ICs 1. ES6838 GPIO TV-Encoder 32-Bit Display SDRAM/ROM VDAC RISC OSD / SPU Interface Processor Controller Scaler DeIntelacer 16 K Cache Audio ADC HDMI I/F Serial Audio Interface Gateway Audio DAC Controller Huffman Descrambler Decoder Transport Servo Controller / RF Video Processor...
  • Page 30: Ha12237F

    2. HA12237F 3-14...
  • Page 31: Ps9829B

    3. PS9829B MBCK MLRCK Input Serial Audio MSDIN[0:3] & Output Output Interface SBCK SLRCK SSDIN[0:3] DMIX_MCLK Serial OLRCK Down Audio OBCK Sample Output Mixer Rate DMIX_SDOUT Interface Converter Automatic Gain PWM1_P/M Limiter Input PWM2_P/M Mapper PWM3_P/M PWM4_P/M Trim 4 Band Bass Main Mixer...
  • Page 32: Str-S6757If1905

    5. STR-S6757IF1905 DRIVE Protection latch Reg& Iconst Delay Burst Start Control Stop Burst MaxON OCP/BD Bottom Selector Soft Start SS/OLP Counter 3-16...
  • Page 33: Tas5142

    6. TAS5142 System Microcontroller TAS5508 BST_A Bootstrap Capacitors BST_B RESET_AB VALID RESET_CD PWM_A OUT_A -Order L-C Left- Output Output Filter Input Channel H-Bridge 1 for Each HúBridge 1 OUT_B Output PWM_B Half-Bridge 2-Channel H-Bridge BTL Mode OUT_C PWM_C -Order L-C Output Right- Output Filter...
  • Page 34: U1739Ej2V1Ud00/Kf2_E

    7. U1739EJ2V1UD00/KF2_E TO00/TI010/P01 16-bit timer/ event counter 00 TI000/P00 Port 0 P00 to P06 RxD6/P14 (LINSEL) TO01/TI011/P06 16-bit timer/ Port 1 P10 to P17 event counter 01 TI001/P05 Port 2 P20 to P27 8-bit timer H0 TOH0/P15 Port 3 P30 to P33 TOH1/P16 8-bit timer H1 Port 4...
  • Page 35 MEMO 3-19...
  • Page 36: Dvd Part Electrical

    SECTION 4 DVD PART ELECTRICAL DVD ELECTRICAL TROUBLESHOOTING GUIDE 1. POWER CHECK GUIDE Power ON Power ON Func Does Does DVD/CD AUX, FM 87.5.AM, USB appear at appear at FLD? FLD? Does Does it DISK1 appear appear DVD ERROR at FLD? at FLD? Does No DISC or Check connector...
  • Page 37: Test & Debug Flow

    2. TEST & DEBUG FLOW Power ON Check connection lines Flash between FLASH & ES8380 or Show LOGO? memory operates the FLASH access time whether properly? is suitable or not. Check connection lines between SDRAM (IC502) & SDRAM works ES8380 or the SDRAM is properly? damaged.
  • Page 38 Does the SLED Moter driver DRV- move to inner side Check the MD MMUTE PIN is when it is at outer high 3 position? Check the related SLED circuit of SLED and signal is OK? motor driver IC (IC401) Check the cable connection with MECHA.
  • Page 39 Laser Check the laser power circuit DVDLD turns on when between ES8381 and power or CDLD output transistor. (Q405, Q406) reading disc? properly? Collector voltage of power Check the related circuit of laser power transistor. transistor is OK? (Q405, Q406) Check cable connection between P400 and pick-up head.
  • Page 40 Proper Check the connections between signal on A, B, C, D Focus on OK? PDM01 and pick-up head. from MD? Proper Check the related circuit of FOO signal on ES8380 focus signal. IC401? Check cable connection between P400 and MD. Proper Check the related circuit Tracking OK?
  • Page 41 Audio Check the connections between outputs are OK signal data on ES8380 and P4703 during playing P8380 is OK? DISK? Check the MAIN PCB For example composite video, Picture check the video mute TR signal data on (Q411), output of video buffer ES8380 is OK? IC (IC407) and ES8380 video signal data...
  • Page 42: Usb Part

    3. USB PART TURN ON USB “Checking” or Check the POWER supply circuit. “USB” display check (Check P5701) Check the HRST# signal Check the USB PART and DVD PART line. Check the USB JACK POWER supply. Reading OK check (Check P5301) Check the USB DATA LINE.
  • Page 43: Waveforms

    WAVEFORMS 1. WHEN POWER ON, RESET & DATA ETC WAVEFORM 1. RESET(DVD) 2. RX 3. TX 4. LCS3# (FLASH) Playing at USB function 1. HRST# 2. 5V 3. D- 4. D+...
  • Page 44: Open / Close Waveform At Power On

    2. OPEN / CLOSE WAVEFORM AT POWER ON 1. open 2. UP-sw 3. DOWN-sw 4. close 3. STARTING ACTION WAVEFORM IN MD DEVICE 1. Driver STBY 2. SLEGN 3. SL+ 4. SL- (At Power on)
  • Page 45: Focus Waveform (At Cd)

    4. FOCUS WAVEFORM (AT CD) 1. F+ 2. F- (NO DISK) 5. FOCUS WAVEFORM (AT DVD) 1.Q401(DVD_LD) 2.Q402(CD_LD) (INSERT CD) 4-10...
  • Page 46: At Power On, Spindle Signal At Md Deck

    6. AT POWER ON, SPINDLE SIGNAL AT MD DECK 1. Spind 2. Spin+ 3. Spin- 7. AT FIRST ACTION, FOCUS SIGNAL A, B, C, D 1. A 2. B 3. C 4. D 4-11...
  • Page 47: Tracking Signal

    8. TRACKING SIGNAL 1. Tro 2. Tr- 3. Tr+ 9. RF WAVEFORM 4-12...
  • Page 48: Disk Type Jugement Waveform

    10. DISK TYPE JUGEMENT WAVEFORM (DVD) 1. F+ 2. FDO 3. SVRRF (CD) 4-13...
  • Page 49 MEMO 4-14...
  • Page 50: Schematic Diagrams

    SCHEMATIC DIAGRAMS 1. MPEG SCHEMATIC DIAGRAM 4-15 4-16...
  • Page 51: Servo Schematic Diagram

    2. SERVO SCHEMATIC DIAGRAM 4-17 4-18...
  • Page 52: Interface Schematic Diagram

    3. INTERFACE SCHEMATIC DIAGRAM 4-19 4-20...
  • Page 53: Printed Circuit Diagram

    PRINTED CIRCUIT DIAGRAM DVD P.C.BOARD (TOP VIEW) 4-21 4-22...
  • Page 54 DVD P.C.BOARD (BOTTOM VIEW) 4-23 4-24...
  • Page 55 MEMO MEMO 4-25 4-26...

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Mds262v