LG DR-7400 Service Manual
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LG DR-7400 Service Manual

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LG
DR-7400
MODEL
SERVICE MANUAL

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Summary of Contents for LG DR-7400

  • Page 1 DR-7400 MODEL SERVICE MANUAL...
  • 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 VIDEO PRODUCTS ....1-2 SERVICING PRECAUTIONS ....................1-3 • General Servicing Precautions • Insulation Checking Prodedure • Electrostatically Sensitive Devices SERVICE INFORMATION FOR EEPROM IC SETTING ..........1-4 SPECIFICATIONS ........................1-5...

  • Page 4: Product Safety Servicing Guidelines For Video Products

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics 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 Recorder covered by Electrostatically Sensitive (ES) Devices this service data and its supplements and addends, read and Some semiconductor (solid state) devices can be damaged follow the SAFETY PRECAUTIONS. NOTE : if unforeseen easily by static electricity.

  • Page 6: Specifications

    SPECIFICATIONS • GENERAL Power requirements AC 110-240V, 50/60 Hz Power consumption Dimensions (approx.) 430x69x280 mm (w x h x d) Mass (approx.) 3.8 Kg Operating temperature 5°C to 35°C Operating humidity 5 % to 90 % Television system PAL B/G colour system Recording format •...
  • Page 7 SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ........................2-2 1. Cabinet and Main Frame Section ...................2-2 2. Deck Mechanism Section(DR-06 + MAIN PCB)..............2-3 3. Packing Accessory Section ....................2-4...

  • Page 8: Exploded Views

    EXPLODED VIEWS 1. Cabinet and Main Frame Section...

  • Page 9: Deck Mechanism Section(Dr-06 + Main Pcb)

    2. DECK MECHANISM SECTION(DR-06 + MAIN PCB)

  • Page 10: Packing Accessory Section

    3. Packing Accessory Section OPTIONAL PART 810 CABLE ASS'Y 821 SCART CABLE Cable, Coaxial 808 Battery Plug Ass'y, 1Way Remote Control Plug Ass'y, 2Way Instruction Ass'y FLAT CABLE Packing Packing...
  • Page 11 SECTION 3 ELECTRICAL CONTENTS VDR PART ELECTRICAL TROUBLESHOOTING GUIDE...................3-2 1. POWER (SMPS) CIRCUIT ......................3-2 2. SYSTEM CIRCUIT ........................3-5 BLOCK DIAGRAMS ........................3-10 1. SMPS BLOCK DIAGRAM ......................3-10 2. VIDEO & AUIDO BLOCK DIAGRAM ..................3-12 CIRCUIT DIAGRAMS ........................3-14 1. POWER CIRCUIT DIAGRAM ....................3-14 2.

  • Page 12: Vdr Part

    VDR PART ELECTRICAL TROUBLESHOOTING GUIDE 1. Power (SMPS) Circuit No 3.3VA Replace the F101 Is the F101 normal? (Use the same Fuse) Is the BD101 normal? Replace the BD101 Is the R101 normal? Replace the R101 Is Vcc (9V - 18V) Is the D102 normal? supplied to IC101 Pin2? Check or Replace the D102...
  • Page 13 No 3.3V No 5.0VA Is the Vcc(3.3V) sup- Is the Vcc(5.3V) sup- Check or Replace Check or Replace plied to Q162 Emittor? plied to IC153 Pin1? the D124 the D123 Check the PWR CTL Check or Replace Is the Q162 Base ‘H’? “H”...
  • Page 14 No 12V No 12VL Is the Vcc(13.5V) sup- Is the Vcc(13.5V) sup- Check or Replace Check or Replace plied to IC157 Pin1? plied to IC152 Pin1? the D127 the D127 Check the PWR CTL Check the PWR CTL Is the IC157 Pin4 ‘H’? Is the IC152 Pin4 ‘H’? “H”...

  • Page 15: System Circuit

    2. SYSTEM CIRCUIT LG logo not displayed at POWER ON IC501(238.237):27M? Check X501 (OSC_IN) IC501(198): Check IC501 and other CVBS_out? Circuits Check IC709(8, 29) EUI_V_OUT DRIVE not recognized Check DRIVE power Check SMPS 5V, 12V Check ATAPI interface connector CN304...
  • Page 16 When playing DISC, no audio output Check IC501 circuits IC501(209, 210, 212, 213) Concerned audio Audio signal normal? IC503(5, 6) Check IC503. SCL, SDA signal normal? IC501 SCL, SDA signal IC715(7, 8) Check IC5715. SCL, SDA signal normal? SCL, SDA signal Check IC715 and Other circuits No DIGITAL output...
  • Page 17 No Tuner Audio Output DISC PLAY Audio Out Check 'When p laying Disc, No audio output' is normal? L1, L2 Check IC708, IC709 (AUDIO SWITCH) en Input and other circuit Audio Out is normal? IC701 22 pin Check the 5.2V and R724 ITU_RESET_L is High? X701 18.432MHz Check X701,C748, C749...
  • Page 18 When SCART Input, No Audio Output DISC PLAY Audio Out Check 'When Playin g Disc , No Audi o Output' is normal? When L3 Input Check 'When RCA Input , No Audio Output' Audio Out is normal? IC709 21, 25 pin(L1), IC709 input is okay? IC709 22, 26 pin(L2) Check SCART Jack (JK701, JK702)
  • Page 19 When Front RCA Input, No Audio Output DISC PLAY Audio Out Check 'When Playin g Disc , No Audi o Output' is normal? IC708 - 1,14 pin Audio signal path from front AV to IC708 and No Audio Signal input ? check CSI03(2, 3pin) IC709 -23, 27 pin Check IC709 and other circuit...

  • Page 21: Block Diagrams

    BLOCK DIAGRAMS 1. SMPS Block Diagram RECTIFIER(33VA) REG 33V REG(12V) RECTIFIER(12VA) 12VL REG(12V) REG(12V) RECTIFIER(5V) REG(5V) REG(5VA) 3.3V RECTIFIER(3.3VA) 3.3VA FEED B. PWR CTL AC100~240V 3-10 3-11...

  • Page 22: Video & Auido Block Diagram

    2. VIDEO / AUDIO Block Diagram REAR REAR COAXIL RCA IN(V,A.L/R) COAXIAL RCA IN(V,A.L/R) COAXIAL TUNER RF SIGNAL TUNER Front Display 18.432MHz Front Display (Wide CLK) (Wide CLK) SIF IN TUNER_V_IN MM1232 MSP34x7 TU_A_L_OUT S/W_V_O Sound TUN-L TU_A_R_OUT Processor EU2_A_IN_L S/W_A_L TUN-R E2-L...

  • Page 23: Circuit Diagrams

    2. Voltages are DC-measured with a digital voltmeter MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. FROM THE LG ELECTRONICS CORPORATION. ALL PERFORMANCE IMPROVEMENT CHANGES INTO COMPONENTS SHOULD BE REPLACED ONLY WITH THE SET IS NOT DELAYED UNTIL THE NEW SERVICE TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR- LITERATURE IS PRINTED.

  • Page 24: Mpeg Circuit Diagram

    2. MPEG CIRCUIT DIAGRAM 3-16 3-17...

  • Page 25: Dsp Circuit Diagram

    3. DSP CIRCUIT DIAGRAM 3-18 3-19...

  • Page 26: Rf Circuit Diagram

    4. RF CIRCUIT DIAGRAM 3-20 3-21...

  • Page 27: Tuner/Mpx/Adc/Dac/Jack Circuit Diagram

    5. TUNER/MPX/ADC/DAC/JACK CIRCUIT DIAGRAM 3-22 3-23...

  • Page 28: Front Jack Circuit Diagram

    6. FRONT JACK CIRCUIT DIAGRAM 3-24 3-25...

  • Page 29: Key Circuit Diagram

    7. KEY CIRCUIT DIAGRAM 3-26 3-27...

  • Page 30: Timer Circuit Diagram

    8. TIMER CIRCUIT DIAGRAM 3-28 3-29...

  • Page 31: Waveforms

    • WAVEFORMS X201 X501 X502 33.86MHz 27MHz 32.768KHz IC501(248) IC502 IC501(227) Y_IN SDRAM_CLK SPDIF IC701(57) IC504(28) IC504(11) SIF_OUT FLASH_OE FLASH_WE 3-30 3-31...

  • Page 32: Circuit Voltage Chart

    • CIRCUIT VOLTAGE CHART MODE MODE MODE MODE MODE MODE MODE PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. I C 2 0 1 IC201 0.00 0.00 0.00 2.49 2.49 2.48 0.00 0.00 0.00 0.00 0.00 0.00...
  • Page 33 MODE MODE MODE MODE MODE MODE MODE PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. PIN NO. 3.35 3.35 3.35 3.35 3.35 3.35 2.85 2.84 2.84 0.00 0.00 0.64 5.20 5.20 5.20 0.00 0.00 0.00 3.35 3.35 3.35 0.04...
  • Page 34 MODE MODE MODE MODE PIN NO. PIN NO. PIN NO. PIN NO. 1.67 1.67 1.08 0.00 0.00 0.00 0.00 0.00 0.00 3.36 3.36 3.36 1.67 1.68 0.58 5.02 5.02 5.02 0.66 0.72 0.68 1.69 1.69 1.69 3.34 3.34 3.34 3.35 3.35 3.35 0.67...

  • Page 35: Printed Circuit Diagrams

    PRINTED CIRCUIT DIAGRAMS 1. MAIN P.C.BOARD(TOP SIDE) 3-38 3-39...

  • Page 36: Main P.c.board(Bottom Side)

    2. MAIN P.C.BOARD(BOTTOM SIDE) 3-40 3-41...

  • Page 37: I/O P.c.board

    3. I/O P.C.BOARD ( TOP SIDE ) ( BOTTOM SIDE ) 4. JACK P.C.BOARD 3-42 3-43...

  • Page 38: Key P.c.board

    5. KEY P.C.BOARD 8. POWER P.C.BOARD LOCATION GUIDE 7746AA 6. FRONT P.C.BOARD 3-44 3-45...

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