LG DP122 Service Manual
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LG DP122 Service Manual

Dvd-video player
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Internal Use Only
Website http://biz.lgservice.com
DVD-VIDEO PLAYER
SERVICE MANUAL
MODEL: DP122
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN75734177
NOVEMBER, 2012

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  • Page 1 Internal Use Only Website http://biz.lgservice.com DVD-VIDEO PLAYER SERVICE MANUAL MODEL: DP122 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN75734177 NOVEMBER, 2012...
  • Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..MECHANISM (DP-15) SECTION 5 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR DVD PRODUCTS ..........1-3 SERVICING PRECAUTIONS .......................... 1-4 • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES THE PROCESS OF DISC / USB DOWNLOAD ..................... 1-5 SPECIFICATIONS ............................1-9...

  • Page 4: Product Safety Servicing Guidelines For Dvd 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

    SERVICING PRECAUTIONS CAUTION: Before servicing the DVD covered by this service Electrostatically Sensitive (ES) Devices data and its supplements and addends, read and follow the Some semiconductor (solid state) devices can be damaged SAFETY PRECAUTIONS. NOTE: if unforeseen circumstanc- easily by static electricity. Such components commonly are es create conflict between the following servicing precautions called Electrostatically Sensitive (ES) Devices.

  • Page 6: The Process Of Disc / Usb Download

    THE PROCESS OF DISC / USB DOWNLOAD METHOD 1. Please follow the below process to download a program with disc. 1) Turn on the DVD-player. (Note. Be sure that there is no disc in DVD-player) 2) Press “SETUP” button on Remote control. 3) Choose a “display”...
  • Page 7 7) Burn the changed file into disc. 8) Open tray, insert disc and close tray. 9) The below picture will appears on the screen. 10) Tray will open automatically. Take off the disc and press PLAY to upgrade. 11) After download process completed. DVD player will turn-off and turn on automatically. 12) Do it again the process 1, 2, 3, 4 to confirm the version.
  • Page 8 METHOD 2. Please follow the below process to download a program with USB. 1) Turn on the DVD-player. (Note. Be sure that there is no disc in DVD-player) 2) Press “SETUP” button on Remote control. 3) Choose a “display” menu by using the cursor button and then choose a “TV Aspect” menu. And choose “16:9” menu.
  • Page 9 7) Save or Copy the changed file into USB Flashdisk on root directory. 8) Make sure the isn’t anything inserted on the set and Plug in the USB Flashdisk. As the return icon displays, press the Return button on remote control. 9) The below picture will appears on the screen.

  • Page 10: Specifications

    SPECIFICATIONS • GENERAL Power requirements AC 200 V ~ 240 V, 50/60 Hz Power consumption 11 W Dimensions (Approx.) 270 x 35 x 195mm (W x H x D) without foot Net Weight (Approx.) 1.4 kg Operating temperature: 5°C to 35°C Operating humidity 5% to 90% Laser...
  • Page 11 MEMO 1-10...
  • Page 12 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................2-2 1. CABINET AND MAIN FRAME SECTION ....................2-2 2. DECK MECHANISM SECTION (DP-15) ....................2-3 3. PACKING ACCESSORY SECTION ......................2-4...

  • Page 13: Exploded Views

    EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION...

  • Page 14: Deck Mechanism Section (Dp-15)

    2. DECK MECHANISM SECTION (DP-15) 015B 015A...

  • Page 15: Packing Accessory Section

    3. PACKING ACCESSORY SECTION 813 Plug Ass’y 3 way 808 Batteries 801 Owner’s manual 900 Remote control 803 Packing 804 Packing Sheet 803 Packing 802 Box Carton...
  • Page 16 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................3-2 1. NO BOOTING ............................3-2 2. NO VIDEO OUTPUT ..........................3-7 3. NO AUDIO OUTPUT ..........................3-8 ELECTRICAL TROUBLESHOOTING GUIDE ....................3-9 1. SMPS TROUBLESHOOTING FLOW ..................... 3-9 2. POWER CHECK FLOW ........................3-11 3.

  • Page 17: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-1. Please check every output voltage. 1) Please check if output voltage 3.3 VA on MAIN board IC605 is normal. If output voltage 3.3 VA is not normal, please check the working status of SMPS board.
  • Page 18 ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-2. Please check MAIN board IC601 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC601 pin8, pin19, pin50, pin68, pin84 is normal. If output voltage 3.3 V is not normal, please check 3.3 VA power line of the MAIN board.
  • Page 19 ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-3. Please check MAIN board IC IC603 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC603 pin1, 3, 9, 14, 27, 43, 49 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of MAIN board.
  • Page 20 ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-4. Please check MAIN board IC IC602 signal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC602 pin8 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of MAIN board.
  • Page 21 ONE POINT REPAIR GUIDE NO BOOTING When you plug power cord and turn the unit on, LED won’t turn on, the unit won’t read disc normally. 1-5. Please check MAIN board IC201 signal and its peripheral circuit. 1) Please check if output voltage 5 V from IC201 pin8, pin19 is normal. If output voltage 5 V is not normal, please check 5 V power circuit of MAIN board.

  • Page 22: Video Output

    ONE POINT REPAIR GUIDE 2. NO VIDEO OUTPUT When you plug power cord and turn the unit on, LED will turn on, the unit will read disc normally, but it won’t have video output or component output. 2-1. Please check the solder joint status of MAIN board connector JK701. If JK701 has cold solder joint, JK701 pins should be oxidized, and please replace JK701.

  • Page 23: Audio Output

    ONE POINT REPAIR GUIDE 3. NO AUDIO OUTPUT When you plug power cord and turn the unit on, LED will turn on, the unit will read disc normally, but it won’t have audio output. 3-1. Please check the solder joint status of MAIN board connector JK701. If JK701 has cold solder joint, JK701 pins should be oxidized, and please replace JK701.

  • Page 24: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS TROUBLESHOOTING FLOW No 5 VA Replace the FR101 Is the FR101 normal? (Use the same ICW) Replace the Is the D105/D106/D107/ D105/D106/D107/D108 D108 normal? Is the Vcc (about 17V) Check or Replace the IC101 supplied to IC101 Pin2? Replace D123 Is the D123 normal? or check if any short circuits...
  • Page 25 ELECTRICAL TROUBLESHOOTING GUIDE No 14 VA Replace D125 Is the 14 VA or check if any short circuits on cathode of D125? Is the 5 VA Check 5 VA troubleshooting flow on cathode of D123? Check or replace transformer No 12 V Is the 14 VA supplied to Check 14 VA troubleshooting flow emitter of Q603...

  • Page 26: Power Check Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER CHECK FLOW No 3.3 VA Is the 5 VA on Check 5 VA troubleshooting flow pin3 of IC605? Is the 3.3 V on Check voltage reference pin1 of IC605 pin2 of IC605? Replace IC605 or check output circuits No 5 V Is the 5 VA on Check 5 VA troubleshooting flow...

  • Page 27: System Operation Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 3. SYSTEM OPERATION FLOW Power on Show LOGO Tray closed? Tray close to closed position SLED at inner side? SLED moves to inner position 1. Judge whether have disc and disc type 2. Jump to related disc reading procedure Recieve OPEN/CLOSE Key? 1.

  • Page 28: System Test Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 4. SYSTEM TEST FLOW TEST Check the AC Replace power PCBA or AC transformer. Voltage Power PCBA (110V or 220V) Switch on the power PCBA Check DC output from SMPS Is the DC supply output OK? (3.3VA,5.3VA,12V) (5 VA and 12 VA) Make sure the main PCBA don't short on VCCs and switch it on.
  • Page 29 ELECTRICAL TROUBLESHOOTING GUIDE RESET or power on. Check connection line Flash between Flash & Mpeg and memory operates Show LOGO? the Flash access time properly? whether is suitable or not Check connection RAM address and RAM SDRAM data between SDRAM & Mpeg and check if works properly? the SDRAM is damage Is the Mpeg...
  • Page 30 ELECTRICAL TROUBLESHOOTING GUIDE Does Is STBY Check STBY connection the SLED move pin of Motor IC between MPEG to inner side when it is is High? and Motor driver IC at outter position? Check DMSO connection Is DMSO between MPEG pin level higher than and Motor driver IC 1.65V?
  • Page 31 ELECTRICAL TROUBLESHOOTING GUIDE Laser DVD_LD, Check the Laser power circuits turns on when on Mpeg IC and connection to CD_LD output reading disc? power transistor properly? Collector voltage Check the related circuit on of power transistor laser power transistor is OK? Check cable connection between transistor ouput and pick-up head.
  • Page 32 ELECTRICAL TROUBLESHOOTING GUIDE Check RF connections Is RF between MPEG signal A,B,C,D,of MPEG IC Focus on OK? and Pick up head properly? Check FOSO connection Is the between MPEG FOSO signal on MPEG IC and Motor driver IC properly? Is F+ Check the focus control &...
  • Page 33 ELECTRICAL TROUBLESHOOTING GUIDE Normal Audio Check connection between Audio output when AMP received correct MPEG and Audio AMP disc playback? data stream? Check the related Normal Audio AMP out? circuit of Audio AMP. Check 12V power supply Check Audio filter, from SMPS board amplify, mute circuit.

  • Page 34: Details And Waveforms On System Test And Debugging

    DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL 1) MT1389V main clock is at 27MHz (X601) FIG 1-1 2) MT1389V reset is active high. 3.3VA PWR_CTL RESET FIG 1-2 3-19...
  • Page 35 3) RS232 waveform during procedure (Downloading) FIG 1-3 4) Flash CE# enable signal and SCK signal during Downloading FIG 1-4 3-20...

  • Page 36: Sdram Clock

    2. SDRAM CLOCK DCLK = 128MHz, Vp-p=2.2, Vmax=2.7V FIG 2-1 3. TRAY OPEN/CLOSE SIGNAL CLOSE_SW OPEN_SW CLOSE OPEN FIG 3-1 3-21...

  • Page 37: Sled Control Related Signal (No Disc Condition)

    4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) SLD_PWM(1.9V/1.4V/1.1V) DR_MUTE(3.3V) FAN_SLD+(4.2V/2.8V/1.2V) FAN_SLD-(4.2V/2.8V/1.5V) FIG 4-1 5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) FOD(1.8V/1.65V/1.5V) FCS+(3.5V/2.8V/2.0V) FCS-(3.3V/2.7V/1.5V) FIG 5-1 3-22...

  • Page 38: Laser Power Control Related Signal (No Disc Condition)

    6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) MDI1(0V/180mV) DVD_LD(3.3V/2.3V) CN201 CD_LD(3.3V/2.3V) FIG 6-1 7. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) SPD_PWM(1.65V/0.3V) FAN_SPN-(4.5V/2.8V) FAN_SPN+(1V/2.8V) FIG 7-1 3-23...

  • Page 39: Focus On Waveform

    8. FOCUS ON WAVEFORM FCS+ FCS- FIG 8-1 (DVD) FCS+ FCS- FIG 8-2 (CD) 3-24...

  • Page 40: Tracking Control Related Signal (System Checking)

    9. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) TRK+ TRK- FIG 9-1 (DVD) TRK+ TRK- FIG 9-2 (CD) 3-25...

  • Page 41: Mt1389V Audio Coaxial Output (Spdif)

    10. MT1389V AUDIO COAXIAL OUTPUT (SPDIF) FIG 10-1 11. MT1389V VIDEO OUTPUT WAVEFORM 1) 100% COLOR BAR FIG 11-1 3-26...

  • Page 42: Audio Output From Mt1389V

    12. AUDIO OUTPUT FROM MT1389V FIG 12-1 3-27...

  • Page 43: Wiring Diagram

    WIRING DIAGRAM BtoB connector P O W E R 3-28...

  • Page 44: Block Diagrams

    BLOCK DIAGRAMS 1. OVERALL BLOCK DIAGRAM Center Center IC702 Woofer Woofer NJM4580M OP-AMP SDCLK;DRA Rear R S#;DCAS#;DWE# IC702 Rear L NJM4580M DBA0-1;DQM0-1 OP-AMP DQ0-15 Ma0-11 APWM_L +/= IC702 APWM_R +/= NJM4580M OP-AMP D_MUTE 3-29...

  • Page 45: Smps & Key Block Diagram

    2. SMPS & KEY BLOCK DIAGRAM CONNECTOR TRANS TRANS SNUBBER SNUBBER SWITCHING IC SWITCHING IC AC100~240V AC100~240V RECTIFIER RECTIFIER 3-30...

  • Page 46: Power Block Diagram

    3. POWER BLOCK DIAGRAM 3-31...

  • Page 47: System Block Diagram

    4. SYSTEM BLOCK DIAGRAM CVBS D_MUTE 3-32...

  • Page 48: Servo Block Diagram

    5. SERVO BLOCK DIAGRAM 3-33...

  • Page 49: A/V Block Diagram

    6. A/V BLOCK DIAGRAM 3-34...

  • Page 50: Circuit Diagrams

    DESIGN BE MODIFIED OR ALTERED WITHOUT DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...

  • Page 51: Main-Mpeg Circuit Diagram

    2. MAIN-MPEG CIRCUIT DIAGRAM MPEG : WAVEFORM NUMBER EAX64794602-SD(#1) 2012. 07. 19 3-37 3-38...

  • Page 52: Main-Servo Circuit Diagram

    3. MAIN-SERVO CIRCUIT DIAGRAM SERVO : WAVEFORM NUMBER EAX64794602-SD(#2) 2012. 07. 19 3-39 3-40...

  • Page 53: Main-Av Circuit Diagram

    4. MAIN-AV CIRCUIT DIAGRAM : WAVEFORM NUMBER EAX64794602-SD(#3) 2012. 07. 19 3-41 3-42...

  • Page 54: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. ICs PIN NO. NO DISC PLAYBACK PIN NO. NO DISC PLAYBACK PIN NO. NO DISC PLAYBACK PIN NO. NO DISC PLAYBACK PIN NO. NO DISC PLAYBACK PIN NO. NO DISC PLAYBACK IC201 (SERVO) 0.582 0.582 0.881 0.932 1.925 1.759...

  • Page 55: Trs

    2. TRs 3. CAPACITORS 4. CONNECTORS MODE NO DISC PLAYBACK PIN name PIN name NO DISC PLAYBACK PIN NO. STOP PLAYBACK PIN NO. STOP PLAYBACK LOCATION SPEC. PIN NO. Functional Functional Q201 CN101 2.88 C708 6.21 6.21 470u/16V Emitter 3.28 3.27 1.31 Collector...

  • Page 56: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-47 3-48...

  • Page 57: Smps & Key / Led P.c.board

    2. SMPS & KEY / LED P.C.BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-49 3-50...
  • Page 58 SECTION 4 MECHANISM (DP-15) CONTENTS DECK MECHANISM PARTS LOCATIONS • Top View ............................. 4-2 • Top View(without Tray Disc) ....................4-2 • Bottom View ..........................4-2 DECK MECHANISM DISASSEMBLY 1. Main Base ............................4-3 1-1. Clamp Assembly Disc ......................4-3 1-1-1. Plate Clamp ......................4-3 1-1-2.

  • Page 59: Deck Mechanism Parts Locations

    DECK MECHANISM PARTS LOCATION • TOP VIEW (WITHOUT TRAY) Procedure Disass Fig- Parts Fixing Type embly Starting No. Main Base Clamp Assembly Disc 1, 2 Plate Clamp 1, 2, 3 Magnet Clamp 1, 2, 3, 4 Clamp Upper Tray Disc 1, 6 Base Assembly Sled 4 Screws,...

  • Page 60: Deck Mechanism Disassembly

    DECK MECHANISM DISASSEMBLY MAIN BASE TRAY DISC DISC CLAMP ASSEMBLY PLATE CLAMP MAGNET CLAMP CLAMP UPPER (Fig. A) BASE MAIN HOLDER LEVER BASE MAIN BASE MAIN BOTTOM SIDE VIEW FIG. 4-1 FIG. 4-2 1. MAIN BASE (FIG. 4-1) 2. TRAY DISC (FIG. 4-2) 1-1.

  • Page 61: Base Assembly Sled

    RUBBER DAMPER Distinguish upper and lower sides (Assemble with care) (S2) RUBBER DAMPER (S2) RUBBER DAMPER (S2) Distinguish upper and lower sides (Assemble with care) BASE PU (S2) GENERAL PICK UP ASSEMBLY GEAR RACK SPINDLE MOTOR ASSEMBLY FIG. 4-3 3. BASE ASSEMBLY SLED (FIG. 4-3) 3-3.

  • Page 62: Frame Assembly Up/Down

    GUIDE UP/DOWN GEAR LOADING GEAR PULLEY SCREW INSERTION TORGUE CONTROL BASE MAIN (800gf DOWN) (L4) BELT LOADING (H1) PWB ASSEMBLY LOADING (C2) (S5) BASE MAIN UP/DOWN FRAME ASSEMBLY (L5) GUIDE UP/DOWN FIG. (A) FIG. (B) GUIDE UP/DOWN GUIDE UP/DOWN FIG. (C) FIG.

  • Page 63: Exploded View

    EXPLODED VIEW 1. DECK MECHANISM EXPLODED VIEW (DP-15) 015B 015A...

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