LG MDT505 Service Manual
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LG MDT505 Service Manual

Mini home theater
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See also: Owner's Manual
Internal Use Only
Website http://biz.lgservice.com
MINI HOME THEATER
SERVICE MANUAL
MODEL: MDT505
(MDS505V/W)
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P
N /
O
:
A
F
N
7
4
9
7
2
218
SEPTEMBER
,
2
0
1
0

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  • Page 1 Internal Use Only Website http://biz.lgservice.com MINI HOME THEATER SERVICE MANUAL MODEL: MDT505 (MDS505V/W) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. SEPTEMBER...
  • Page 2 CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...
  • Page 3 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 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 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 SERVICE INFORMATION FOR EEPROM POWER ON DVD LOGO status DETECT NEW EEPROM (OPTION EDIT SCREEN) (N0 disc status) NAME Remote control OPT 1 OPT 2 pause key 1 4 7 2 in order OPT 3 OPT 4 OPT 5 OPT 6 OPT 7 OPT 8 OPT 9...
  • Page 7 HOW TO UPDATE AUDIO MICOM & DVD PROGRAMS 1. How to update AUDIO MICOM program. [Update using CD] 1. Change the filename to download as “MDS715_(Version).HEX”. Only upper cases are permitted. ex) MDS715 : “MDS715_0709081.HEX” 2. Copy the file to the root folder of a CD and burn it. 3.

  • Page 8: Specifications

    SPECIFICATIONS • GENERAL Power supply 110~240 V, 50/60 Hz Power consumption Refer to main label Dimensions (W x H x D) 273 x 333 x 339 mm without foot Net Weight (Approx.) 5.7 kg Operating temperature 41 °F to 95 °F (5 °C to 35 °C) Operating humidity 5 % to 90 % Bus Power supply (USB)
  • Page 9 • SPEAKERS Front speaker (MDS505V) Ω Rated Input Power 150 W Net Dimensions(W x H x D) 240 x 387 x 336 mm Passive Subwoofer (MDS505W) Ω Rated Input Power 200 W Net Dimensions(W x H x D) 261 x 331 x 409 mm...

  • Page 10: Table Of Contents

    CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................. 2-3 1. CABINET AND MAIN FRAME SECTION (MDT505) ................2-3 2. TAPE DECK MECHANISM SECTION ...................... 2-5 3. DVD DECK MECHANISM SECTION (DVM-H1723) ................2-7 4. SPEAKER SECTION ..........................2-11 5. PACKING ACCESSORY SECTION ....................... 2-13...
  • Page 11 MEMO...

  • Page 12: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION (MDT505) iPod CABLE1 270L 263L 270R 263R MAIN FRONT CABLE3 SMPS CABLE2 VOLUME CABLE4 CABLE5 267A 267A...

  • Page 13: Tape Deck Mechanism Section

    2. TAPE DECK MECHANISM SECTION (A/R & A/S : RIGHT A/R DECK)

  • Page 14: Dvd Deck Mechanism Section (Dvm-H1723)

    3. DVD DECK MECHANISM SECTION (DVM-H1723) 153A 169A 169B 169C...
  • Page 15 MEMO MEMO 2-10...

  • Page 16: Speaker Section

    4. SPEAKER SECTION 4-1. FRONT SPEAKER (MDS505V) 2-11...
  • Page 17 4-2. PASSIVE SUBWOOFER (MDS505W) 2-12...

  • Page 18: Packing Accessory Section

    5. PACKING ACCESSORY SECTION 808 Battery 824 AM Loop Antenna 811 RCA Cable, 1 Pin(Black) 825 FM Wire Antenna 900 Remote Control 801 Owner’s Manual 803 Packing, Casing 804 Bag 802 Box 2-13...
  • Page 19 MEMO 2-14...
  • Page 20 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ..................3-2 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ........ 3-16 WIRING DIAGRAM ........................... 3-29 BLOCK DIAGRAM ............................ 3-31 CIRCUIT DIAGRAMS ..........................3-33 1. SMPS - POWER CIRCUIT DIAGRAM ....................3-33 2. MAIN - MICOM CIRCUIT DIAGRAM ....................3-35 3.

  • Page 21: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS BOARD No power. Check the AC Connect the open line. line pattern. Check fuse F901. Replace F901. Check BD901 “+” Low impedance: Replace IC901, BD901. to “-” Pin impedance . Check C978 Check 3.7 V lines short. voltage (3.9 V).
  • Page 22 ELECTRICAL TROUBLESHOOTING GUIDE No sound. Check IC961 Check no power list, AC input voltage. Vcc voltage(34 V ~ 43 V). Check C955 voltage Check AMP module short. (25 V or 36 V). Replace PC951, IC901. Replace IC961, IC901 or SMPS board.
  • Page 23 ELECTRICAL TROUBLESHOOTING GUIDE 2. FRONT BOARD Power on. “WELCOME” PN301 cable Check 36p FFC cable. Display connection ok? on VFD ok? PN301 Pin1,2,3,6 Check SMPS board. power ok? PN301 Check MAIN board. Pin7, 8, 9, 10 data signal IC301 Replace IC301. check ok? Digitron (DIG301) ok? Replace DIG301.
  • Page 24 ELECTRICAL TROUBLESHOOTING GUIDE 3. NO AUDIO CHECK CD/DVD Disc AUX function. or USB play. IC200 IC602 Pin4, 5, Pin7,8 audio Check IC500. Check JK201. 6, 7, 8 I2S input L/R ok? signal ok? IC602 I2S output signal Check IC602. HEADPHONE output. PORTABLE function.
  • Page 25 ELECTRICAL TROUBLESHOOTING GUIDE IPOD function. TUNER Function. IC200 Check Tuner (TU345) Pin23,24 audio and Antenna IPOD B/D Check IPOD L/R ok? connection. CN201 Pin27, connection or CN201. 28 audio L/R IC200 Check IC500 and Pin42, 43, 44 I2S X500. clock ok? IPOD B/D CN202 Pin13, 15 Check IPOD Board.
  • Page 26 ELECTRICAL TROUBLESHOOTING GUIDE 4. NO VIDEO CHECK COMPONENT video out. IC201 Pin2, 3, 4 Check IC500. video signal ok? IC201 Pin11, 12, 13 Check IC201. video signal ok? Check JK201. CVBS video out . IC252 Pin3 Check IC500. video signal ok? IC252 IC252 Pin4 Pin6 LOW...
  • Page 27 ELECTRICAL TROUBLESHOOTING GUIDE CVBS video out (IPOD video). IPOD B/D Check IPOD connection CN201 Pin23 video or CN201. signal ok? IPOD B/D Check IPOD Board. CN202 Pin10 ok? Check 15p Harness cable MAIN B/D IC250 Pin4 ok? and connection. IC252 Pin1 Check IC250.
  • Page 28 5. SYSTEM OPERATION FLOW POWER ON. 1. Initializes SERVO, DSP & RISC registers. 2. Write RISC code to SDRAM. 3. Reset RISC. Show LOGO. Tray closed? Tray close to closed position. SLED at inner side? SLED moves to inner position. 1.
  • Page 29 6. TEST & DEBUG FLOW TEST. Check the Check the POWER PART. AC voltage Power PCBA (110 V or 220 V). Switch on the Power PCBA. Are the Check the POWER PART. DC Voltage outputs OK? (from the SMPS). Are 3.7, 5.6, 12 and 28 V(36V) DC outputs normal on Check the regulators or diode.
  • Page 30 Power On. Check connection lines between Flash FLASH & MT1389SE/GH and Memory operates Show LOGO? the FLASH access time properly? whether is suitable or not. Check connection lines SDRAM between SDRAM(IC503) & works properly? MT1389SE/GH and the SDRAM is damaged. MT1389SE/GH Check the related circuit of VIDEO outputs...
  • Page 31 Does Motor the SLED move to inner Check the connection line of Driver M_STBY side when it is at outer M_STBY. Pin is high? position? Motor Check the related circuit of Driver SLD SLD. Pin is High? SLED+ and Check the amp circuit on motor SLED- output driver.
  • Page 32 Check the laser power circuit Laser DVDLD or on MT1389SE/GH and turns on when CDLD output connecting to power transistor. reading disc? property? (Q400, Q401). Collector Check the related circuit on voltage of power transistor laser power transistor. is OK?(Q400, Q401) Check cable connection between transistor output and pick-up head(23p FFC).
  • Page 33 Proper Check connections between signals on A, B, C, Focus on ok? MT1389SE/GH and pick-up head. D of MT1389SE/GH. Proper Check the related circuit on CD_DVDCT signal on MT1389SE/GH CD_DVDCT. MT1389SE/GH. Check CD_DVDCT connection between S3053 and MT1389SE/GH. Proper Check the related circuit on CD_DVDCT signal on Track On OK? MT1389SE/GH.
  • Page 34 Check connection between Normal Audio IC602(PWM IC) IC500 BCK, LRCK, ADATA0, output when disc received correct data ADATA1, ADATA2(Pin157, playback? stream? 158, 160, 161, 162). Normal Check the related circuit of PWM IC out?(IC602). PWM IC Check AMP IC (IC701, 702, 703). TEST END.

  • Page 35: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27 MHz CLOCK,RESET,FLASH R/W SIGNAL 1) MT1389SE/GH main clock is at 27 MHz(X500) FIG 1-1 2) MT1389SE/GH reset is high active. Power Cord in P_CTL DVD_RST RESET_IN FIG 1-2 3-16...
  • Page 36 3) Flash R/W enable signal during download(Downloading) SF_DI SF_DO FIG 1-3 2. SDRAM CLOCK 1) MT1389SE/GH main clock is at 27 MHz(X500) DCLK = 93 MHz, Vp-p = 2.2, Vmax = 2.7 V SDCLK FIG 2-1 3-17...
  • Page 37 3. VIDEO PART-1 (100% FULL COLOR-BAR) CVBS_I 3-18...
  • Page 38 4. VIDEO PART-2 (100% FULL COLOR-BAR) CVBS COMP_Y COMP_Pb COMP_Pr 3-19...
  • Page 39 5. SERVO OPEN/CLOSE SIGNAL 1) Tray open/close waveform 2) Tray close waveform OPENSW OPENSW CLOSESW CLOSESW OPEN OPEN CLOSE CLOSE FIG 5-1 FIG 5-2 3) Tray open waveform OPENSW CLOSESW OPEN CLOSE FIG 5-3 3-20...
  • Page 40 6. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) M-STBY FIG 6-1 3-21...
  • Page 41 7. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) FIG 7-1 8. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) MDI1 DVDLD CDLD FIG 8-1 3-22...
  • Page 42 9. DISC TYPE JUDGEMENT WAVEFORMS PU_DET FIG 9-1 (DVD) 31 : This signal can see using special debug program PU_DET FIG 9-2 (DVD) 3-23...
  • Page 43 PU_DET FIG 9-3 (CD) 34 : This signal can see using special debug program PU_DET FIG 9-4 (CD) 3-24...
  • Page 44 10. FOCUS ON WAVEFORMS 36 : This signal can see using special debug program PU_DET FIG 10-1 (DVD) PU_DET FIG 10-2 (CD) 3-25...
  • Page 45 11. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION) SPinD FIG 11-1 3-26...
  • Page 46 12. TRACKING CONTROL RELATED SIGNAL(System checking) 43 : This signal can see using special debug program PU_DET PU_DET FIG 12-1(DVD) PU_DET PU_DET FIG 12-2(CD) 3-27...
  • Page 47 MEMO 3-28...

  • Page 48: Wiring Diagram

    WIRING DIAGRAM DC FAN 3 CD CHANGER MD TUNER P7708 5.1 CH SPK TERMINAL JACK MODULE SMPS PCB MAIN P8501 P8502 PN201 P1001 PN102 CN200 CN102 CN101 CN952 CN951 DECK MIC/USB MECHANISM CN202 IPOD PCB CN301 PN301 JOG PCB FRONT PCB KARAOKE 3-29 3-30...

  • Page 49: Block Diagram

    Cassette LRCLK,DATA DSP_IBO PWM/DSP_DATA DSP/ Deck ASP Modulat DVD_RST SPI(4P) TAPE MDS715:5.1ch LRCLK, BCLK 27 MHz MDT505:2.1ch Tuner MCLK MDD305 : 2ch A, B, C, D, E, F, RF CS5346 Aux-IN 5346_DATA TJ3965D MTK1389GH MD_DVD, MD_CD 3.3V LDO Portable LD_DVD, LD_CD...

  • Page 50: Circuit Diagrams

    MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG CORPORATION. ALL COMPONENTS PERFORMANCE IMPROVEMENT CHANGES INTO SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL THE SET IS NOT DELAYED UNTIL THE NEW SERVICE TO THOSE IN THE ORIGINAL CIRCUIT.

  • Page 51: Main - Micom Circuit Diagram

    2. MAIN - MICOM CIRCUIT DIAGRAM MDS715 MAIN #001 MICOM EBY60749301 REV 7.1 3-35 3-36...

  • Page 52: Main - Pwm Circuit Diagram

    3. MAIN - PWM CIRCUIT DIAGRAM MDS715 MAIN #002 PWM EBY60749301 REV 7.1 3-37 3-38...

  • Page 53: Main - Amp Circuit Diagram

    4. MAIN - AMP CIRCUIT DIAGRAM MDS715 MAIN #003 AMP EBY60749301 REV 7.1 3-39 3-40...

  • Page 54: Main - Deck Circuit Diagram

    5. MAIN - DECK CIRCUIT DIAGRAM MDS715 MAIN #004 DECK EBY60749301 REV 7.1 3-41 3-42...

  • Page 55: Main - Mpeg Circuit Diagram

    6. MAIN - MPEG CIRCUIT DIAGRAM MDS715 MAIN #005 MPEG EBY60749301 REV 7.1 3-43 3-44...

  • Page 56: Main - Servo Circuit Diagram

    7. MAIN - SERVO CIRCUIT DIAGRAM MDS715 MAIN #006 SERVO EBY60749301 REV 7.1 3-45 3-46...

  • Page 57: Main - I/O Circuit Diagram

    8. MAIN - I/O CIRCUIT DIAGRAM MDS715 MAIN #007 I/O EBY60749301 REV 7.1 3-47 3-48...

  • Page 58: Vfd Circuit Diagram

    9. VFD CIRCUIT DIAGRAM MDS715/MD505/MDD305 VFD(FRONT) EBY60729301 REV 6.2 3-49 3-50...

  • Page 59: Mic & Usb Circuit Diagram

    10. MIC & USB CIRCUIT DIAGRAM MDS715/MDT505/MDD305/MCT565 MIC & USB EBY60729401 REV 6.2 3-51 3-52...

  • Page 60: Volume Circuit Diagram

    11. VOLUME CIRCUIT DIAGRAM MDS715/MDT505/MDD305 MAIN VR & JOG VOL EBY60729501 REV 2.2 3-53 3-54...

  • Page 61: Ipod Circuit Diagram (Optional Part)

    12. IPOD CIRCUIT DIAGRAM (OPTIONAL PART) MDS715/MDT505-IPOD EBY60729701 REV 5.2 3-55 3-56...

  • Page 62: Karaoke Circuit Diagram (Optional Part)

    13. KARAOKE CIRCUIT DIAGRAM (OPTIONAL PART) MDS715/MDT505/MDD305 NO-KEY EBY60729601 REV 4.1 3-57 3-58...

  • Page 63: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART IC Symbol NAME/TYPE SPEC. VOLTAGE 100V - 10% 240V/50Hz+10% LOCA. NO. Capacity Spec.(V) IC101 LC87F5NC8A VDD 14 PIN: +3.28V Voltage(V) Voltage(V) VDD: +3.0 ~ +5.5V MICOM VDD: 14,40,55,89 40,55,89 PIN : +3.28V BD901 127.3 373.3 CS5346-CQZR C901 150 uF 127.3 373.3...

  • Page 64: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) 3-61 3-62...
  • Page 65 MAIN P.C.BOARD (BOTTOM VIEW) 3-63 3-64...

  • Page 66: Smps P.c.board

    2. SMPS P.C.BOARD NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. MDS715 EAX35194121 REV 4.2 2010. 06. 11 3-65 3-66...

  • Page 67: Front(Vfd / Usb & Mic / Volume) P.c.board

    3. FRONT(VFD / USB & MIC / VOLUME) P.C.BOARD 3-67 3-68...

  • Page 68: Ipod P.c.board (Optional Part)

    4. IPOD P.C.BOARD (OPTIONAL PART) (TOP VIEW) (BOTTOM VIEW) 5. KARAOKE P.C.BOARD (OPTIONAL PART) 3-69 3-70...
  • Page 69 MEMO MEMO 3-71 3-72...

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