LG DP122NU Service Manual
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LG DP122NU Service Manual

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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
N /
O
:
A
F
N
75734180
AUGUST
,
2
0
1
2

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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. 75734180 AUGUST...
  • Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..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 USB DOWNLOAD ......................1-5 SPECIFICATIONS ............................1-8...

  • 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 Usb Download

    THE PROCESS OF USB DOWNLOAD 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” menu by using the cursor button and then choose a “TV Aspect” menu. And choose “16:9”...
  • Page 7 8. Insert the copied USB memory stick or Disc to DVD-player. 9. Press the RETURN button on the DVD Player. (USB only) 10. If the below picture appears on the screen. Press “PLAY” button on Remote controller. While this menu appears, please don’t eject disc or take out USB. 11.
  • Page 8 12. After USB download is completed, DVD-player displays below picture automatically. 13. Do power off of DVD-Player. 14. Remove the Disc or USB memory stick. 15. Turn on the DVD-player. Select the initial Language and Press “Enter” button. Then, Select “Enter” and Press “Enter” button. 16.

  • Page 9: Specifications

    SPECIFICATIONS • GENERAL Power requirements AC 120 V, 60 Hz Power consumption 11 W Dimensions (Approx.) 270 x 37.5 x 203 mm (W x H x D) without foot Net Weight (Approx.) 1.41 kg Operating temperature 0 °C to 40 °C Operating humidity 5 % to 90 % Laser...
  • Page 10 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................2-2 1. CABINET AND MAIN FRAME SECTION ....................2-2 2. PACKING ACCESSORY SECTION ......................2-3...
  • Page 11 EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION...
  • Page 12 2. PACKING ACCESSORY SECTION 801 Owner’s manual 808 Battery(AAA) 813 Plug Ass’y 3 way 900 Remote control 804 Packing sheet 802A 802B 802 Box carton...
  • Page 13 MEMO...
  • Page 14 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ....................3-2 1. NO BOOTING WHEN YOU TURN THE UNIT ON ................. 3-2 2. NO VIDEO OUTPUT WHEN YOU TURN THE UNIT ON ..............3-7 3. NO AUDIO OUTPUT WHEN YOU TURN THE UNIT ON ..............3-8 ELECTRICAL TROUBLESHOOTING GUIDE ..............3-9 1.

  • Page 15: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO BOOTING WHEN YOU TURN THE UNIT ON When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc nornally. 1-1. Please check every output voltage. 1) Please check if output voltage 3.3 V from main board Q4 C polarity is normal.
  • Page 16 ONE POINT REPAIR GUIDE When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc nornally . 1-2. Please check main board IC U1 singal and its peripheral circuit. 1) Please check if output voltage 3.3 V from U1 pin4, pin32, pin78, pin83 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of main board.
  • Page 17 ONE POINT REPAIR GUIDE When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc nornally. 1-3. Please check main board IC U2 singal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC U2 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 18 ONE POINT REPAIR GUIDE When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc nornally. 1-4. Please check main board IC U3 singal and its peripheral circuit. 1) Please check if output voltage 3.3 V from IC U3 pin8 is normal. If output voltage 3.3 V is not normal, please check 3.3 V power circuit of main board.
  • Page 19 ONE POINT REPAIR GUIDE When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc nornally. 1-5. Please check main board IC U4 singal and its peripheral circuit. 1) Please check if output voltage 5 V from U4 pin8, pin19 is normal. If output voltage 5 V is not normal, please check 5 V power circuit of main board.

  • Page 20: Video Output When You Turn The Unit On

    ONE POINT REPAIR GUIDE 2. NO VIDEO OUTPUT WHEN YOU TURN THE UNIT ON When you plug power cord and turn the unit on, LED light will turn red, the unit will read disc nornally, but it won’t have video output. 2-1.

  • Page 21: Audio Output When You Turn The Unit On

    ONE POINT REPAIR GUIDE 3. NO AUDIO OUTPUT WHEN YOU TURN THE UNIT ON When you plug power cord and turn the unit on, LED light will turn red, the unit will read disc nornally, but it won’t have audio output. 3-1.

  • Page 22: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS TROUBLESHOOTING FLOW No +5 V Is the Replace the F501 F501(T2AL) normal? (Use the same ICW) Replace Is the D501/D502/D503/D504 the D501/ D502/ D503/ D504 normal? Is the U1(TNY176) Replace the U1 normal? Is the D509 Replace the D509 normal? Is there...
  • Page 23 ELECTRICAL TROUBLESHOOTING GUIDE No 12 V Is the D7 Replace the D7 normal? Is the Vcc(≒12V) Check the ‘PCON/LED“H”’ supplied to main PCBA Q30 signal from main PCBA U1 Pin118 base? Check or replace the main PCBA Q3 or Q30 3-10...

  • Page 24: Power Check Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER CHECK FLOW No 3.3 V No 1.2 V Is M5V Is M5V supplied to Q4 supplied to Q5 collector? collector? Check or Replace Q4. Replace the R17(1.8R/2W) Is M5V supplied to Q5 Replace the R20(5.6R/1W) collector? Check or Replace Q5 3-11...

  • Page 25: System Operation Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 3. SYSTEM OPERATION FLOW Power on 1. MCU initializes SERVO,DSP & RISC registers 2. Write RISC code to SDRAM 3. Reset RISC Show “HELLO” Tray closed? Tray close to closed position SLED at inner side? SLED moves to inner position 1.

  • Page 26: System Test Flow

    ELECTRICAL TROUBLESHOOTING GUIDE 4. SYSTEM TEST FLOW TEST Check the AC Voltage Power PCBA Replace power PCBA (110V or 220V) Make sure the main PCBA don’t short . Repair or Replace main PCBA power PCBA connected to AC voltage Is the DC voltage outputs OK? Repair or Replace power PCBA (5V, 12V)
  • Page 27 ELECTRICAL TROUBLESHOOTING GUIDE RESET or power on. Check connection lines Flash between FLASH & memory operates Show “SET”? SPHE8202RQ-D and the properly? FLASH access time whether is suitable or not. Check the related SPHE8202RQ-D VIDEO outputs circuit of SPHE8202RQ-D properly? Check the filtering and Have TV Set language...
  • Page 28 ELECTRICAL TROUBLESHOOTING GUIDE Does Motor the SLED move Check the connection Driver DMEA to inner side when it is line of DMEA signal. Pin is High? at outter position? Is SPDCO Check the related DC Level Higher circuit of SCO than 1.65V? Check the amp &...
  • Page 29 ELECTRICAL TROUBLESHOOTING GUIDE Laser Check the laser power DVDLDO, turns on when CDLDO output circuit on SPHE8202RQ-D and reading disc? connedting to power transistor. properly? Collector Check the related circuit on voltage of power laser power transistor transistor is OK? Check cable connection between transistor ouput and pick-up head.
  • Page 30 ELECTRICAL TROUBLESHOOTING GUIDE Check connections Proper between SPHE8202RQ-D signals on A,B,C,D of Focus on OK? SPHE8202RQ-D and pick-up head. Check the FCO Check FCO signal on connection on SPHE8202RQ-D and motor driver. SPHE8202RQ-D FOC+ & Check the focus control FOC- output amp circuit on motor driver properly? Check cable connection...
  • Page 31 ELECTRICAL TROUBLESHOOTING GUIDE Normal Audio Check connection between Audio output when AMP received correct SPHE8202RQ-D & Audio AMP. disc playback? data stream? Check the related Normal circuit of Audio AMP. Audio AMP out? Check Audio filter, amplify, mute circuit. Commu- Normal nications between Check communication...

  • Page 32: 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) SPHE8202RQ-D main clock is at 27MHz (Y2) CLKOUT 27MHz/30PPM 27MHz/30PPM CLKIN 100K 100K 33pF/50V/NP0 33pF/50V/NP0 33pF/50V/NP0 33pF/50V/NP0 FIG 1-1 2) SPHE8202RQ-D reset is active high. 3.3V DVCC3 TP17...
  • Page 33 3) RS232 waveforn during procedure (Downloading) TP47 TP47 TP46 TP46 TP48 TP48 TP45 TP45 Debug Port M+5V V_V_SYNC V_H_SYNC 4PIN/2.0mm 4PIN/2.0mm FIG 1-3 4) Flash CE# enable signal and SCK signal during Downloading DVCC3 DVCC3 SPI_CE SPI_D0 HOLD# SPI_CLK SPI_D1 0.1uF/25V/Y5V 0.1uF/25V/Y5V 0.1uF/25V/Y5V...

  • Page 34: Sled Control Related Signal (No Disc Condition)

    2. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) TP50 TP50 FOCUS_S DRVSB DRVSB VINFC MUTE TR_B1 VREF2 TR_B1 BIAS REGO2 TRACK_S REGO2 VINTK SPDL_S TR_B2 VINSL TR_B2 REGO1 RESET REGO1 RESET TRAY+ SLED_S VINLD TRAY- VCC1 VCTL LOAD- VOTR- VCCD LOAD+ VOTR+ VCC2...

  • Page 35: Laser Power Control Related Signal

    4. LASER POWER CONTROL RELATED SIGNAL TP64 TP64 TP59 TP59 TP58 TP58 TP55 TP55 TP56 TP56 TP63 TP63 TP57 TP57 TP65 TP65 TP66 TP66 TP62 TP62 TP67 TP67 24PIN/0.5mm 24PIN/0.5mm FACT- FACT+ TACT+ TACT- PUHRF VREF1 FIG 4-1 (NO DISC CONDITION) CDVR# DVDVR# PUH_CDLD...

  • Page 36: Spindle Control Waveform

    5. SPINDLE CONTROL WAVEFORM TP50 TP50 FOCUS_S DRVSB DRVSB VINFC MUTE TR_B1 VREF2 TR_B1 BIAS REGO2 TRACK_S REGO2 VINTK SPDL_S TR_B2 VINSL TR_B2 RESET REGO1 REGO1 RESET TRAY+ SLED_S VINLD TRAY- VCC1 VCTL LOAD- VOTR- VCCD LOAD+ VOTR+ VCC2 /Y5V /Y5V SP_MOT- SL_MOT+...

  • Page 37: Tracking Control Related Signal (System Checking)

    7. TRACKING CONTROL RELATED SIGNAL (SYSTEM CHECKING) TP50 TP50 FOCUS_S DRVSB DRVSB VINFC MUTE TR_B1 VREF2 TR_B1 BIAS REGO2 TRACK_S REGO2 VINTK FIG 7-1 (CD) SPDL_S TR_B2 VINSL TR_B2 RESET REGO1 REGO1 RESET SLED_S VINLD C4 0.1uF/25V/Y5V C4 0.1uF/25V/Y5V VCC1 VCTL LOAD- VOTR-...

  • Page 38: Sphe8202Rq-D Audio Coaxial Output (Spdif)

    8. SPHE8202RQ-D AUDIO COAXIAL OUTPUT (SPDIF) TP68 TP68 SPDIF_OUT R113 R113 500/800mA 500/800mA COAX R116 R116 0.1uF/25V/Y5V 0.1uF/25V/Y5V NC/C114 NC/C114 10pF/50V/NP0 10pF/50V/NP0 47pF/50V/NP0 47pF/50V/NP0 SPDIF Circuit FIG 8-1 9. SPHE8202RQ-D VIDEO OUTPUT WAVEFORM 1) 100% COLOR BAR FIG 9-1 3-25...

  • Page 39: Audio Output From Sphe8202Rq-D/128

    10. AUDIO OUTPUT FROM SPHE8202RQ-D/128 FIG 10-1 3-26...

  • Page 40: Wiring Diagram

    WIRING DIAGRAM CVBS COAX AUDIO & VIDEO AMP&LPF SDRAM M12L64164A SPHE8202RQ-D 16M SPI FLASH HOMESW EN25T1 INSW 2PIN*2.0 12PIN*2.0 MAIN BOARD XS301 POWER 12PIN*2.0 SUPPLY KEY+USB PI176 3-27...
  • Page 41 MEMO 3-28...

  • Page 42: 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 43: Power Supply, M_Driver, Opu_Connector Circuit Diagram

    2. POWER SUPPLY, M_DRIVER, OPU_CONNECTOR CIRCUIT DIAGRAM TP50 TP50 FOCUS_S DRVSB DRVSB 12 25 VINFC MUTE TR_B1 VREF2 TR_B1 BIAS TP70 TP70 REGO2 TRACK_S REGO2 VINTK SPDL_S TR_B2 VINSL TR_B2 FROM POWER BOARD M+5V Servo analog +5V RESET REGO1 PUHRF REGO1 RESET PUHRF...

  • Page 44: Sphe8202Rq, Flash, Sdram Circuit Diagram

    3. SPHE8202RQ, FLASH, SDRAM CIRCUIT DIAGRAM DVCC3 SDRAM +3.3V PUHRF PUHRF DVDMDI SD_VCC3 DVDMDI CDMDI CDMDI DVDVR DVDVR 0.1uF/25V/Y5V 0.1uF/25V/Y5V 0.1uF/25V/Y5V 0.1uF/25V/Y5V CDVR CDVR TP22 TP22 DVDLDO DVDLDO CDLDO CDLDO DVCC3 DVCC3 VREF1 Close to SDRAM SD_VCC3 VREF1 M_D0 M_D15 DQ15 SPI_CE SD_VCC3...

  • Page 45: Audio Amplify, Audio Output, Mute, Video Buffer, Video Output Circuit Diagram

    4. AUDIO AMPLIFY, AUDIO OUTPUT, MUTE, VIDEO BUFFER, VIDEO OUTPUT CIRCUIT DIAGRAM TP68 TP68 AUDIO_MUTE_CTL AUDIO_MUTE_CTL 4 SPDIF_OUT SPDIF_OUT SPDIF_OUT R113 R113 AOUT_FL AOUT_FL 500/800mA 500/800mA AOUT_FR AOUT_FR COAX CVBS CVBS R116 R116 0.1uF/25V/Y5V 0.1uF/25V/Y5V NC/C114 NC/C114 P+5V P+5V 10pF/50V/NP0 10pF/50V/NP0 47pF/50V/NP0 47pF/50V/NP0...

  • Page 46: Front Led Display, Key Control Circuit Diagram

    5. FRONT LED DISPLAY, KEY CONTROL CIRCUIT DIAGRAM +12V +12V GND_POWER GND_POWER GND_POWER +12V 14PIN/2.0mm 14PIN/2.0mm +12V IRM_8.3mm IRM_8.3mm KEY2 KEY1 K303 K303 IR_IN POWER POWER USB5V FGND USB_DP K302 K302 R308 R308 USB_DM C302 C302 PLAY/PAUSE PLAY/PAUSE IR_IN 100pF/50V/NP0 100pF/50V/NP0 C304 C304...

  • Page 47: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. MPEG & SDRAM 2. ICs 3.15-3.45 3.317 3.323 Part Part Part 0.408 1.036 3.15-3.45 3.317 3.323 0.015 0.023 3.15-3.45 BB431BLP U503 2.49 4.14 0.423 1.071 PC123 U502 5.05 4.12 0.912 0.410 1.124 3.15-3.45 3.318 3.324 3.15-3.45 TNY176PN 0.968 5 6 7 8 0...

  • Page 48: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-41 3-42...

  • Page 49: Smps P.c.board

    2. SMPS P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-43 3-44...

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