LG LX-D2640 Service Manual
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LG LX-D2640 Service Manual

LG LX-D2640 Service Manual

Stylish dvd micro home theater system
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STYLISH DVD MICRO
HOME THEATER SYSTEM
SERVICE MANUAL
P/N : 3829RAT115B
AUGUST, 2004
MODEL: LX-D2640, LXS-D2640W

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Summary of Contents for LG LX-D2640

  • Page 1 STYLISH DVD MICRO HOME THEATER SYSTEM SERVICE MANUAL P/N : 3829RAT115B AUGUST, 2004 MODEL: LX-D2640, LXS-D2640W...
  • Page 2 • MODEL : LX-D2640 ........

  • Page 3: Section 1. General

    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. Storage in conductive bag Drop 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: Specifications

    ❏ SPECIFICATIONS General Section Power supply Refer to the main label. Power consumption 110W Amplifier Section Tuning Range 87.5 - 108.0 MHz or 65 -74 MHz, 87.5 -108.0 MHz Intermediate Frequency 10.7 MHz Signal to Noise Ratio 60/55 dB (Mono/Stereo) AM Tuning Range 522 - 1611 kHz or 530 - 1610 kHz or 530 - 1720 kHz Intermediate Frequency...
  • Page 7 MEMO - 1-6 -...

  • Page 8: Section 2. Electrical

    SECTION 2. ELECTRICAL ❏ TROUBLESHOOTING GUIDE P-SENS PART CHECK ZD 601(+) Voltage check D602(+) rectification waveform check D602 Replacement IC301 26PIN PATTERN Check ZD601 replacement VKK CHECK PN601 31pin -27V check C668(-) DC -32V check Pattern check front pcb Ass’y D603, D605 replacement D602(-) DC -27V check ZD602 check replacement...

  • Page 9: Power Check

    POWER CHECK Every kinds of Fuse check Fuse replacement C916(-), C917(+) DC power output check PN900, 8, 9 AC voltage output check Transformer replacement IC904, IC909, (IC906) Output D911, 912, 913, 914 check replacement DC +12V/(-12V) power check PN901 5, 7 PIN DC power check System cable check IC905 output DC 5.6V power check IC904, IC909, IC906 replacement, PATT check...
  • Page 10 Muting circuit Troubleshooting (if MUTE) Q700, Q750, Q720, Q770, Q730 Base “LOW” Q783, Q784, Q785 “E” High check IC703 5, 6, 7 pin High check IC703 Troubleshooting check PATT check Q700, Q750, Q720, Q770, Q730 collector “Low” Each appropriate TR replacement MUTE No sound Ic702 pin 4, 6 signal output check...
  • Page 11 Specific FUNCTION MODE has no sound TAPE IC603 pin4, 11 signal input check Refer IC201 Troubleshooting AUX/AUX2 IC603 pin1, 12/pin5, 14 signal input check JK601 signal input check IC601 pin3, 26 signal input check PN602 pin15, 17 signal input check TUNER IC603 pin2, 15 signal input check Refer to Tuner pack troubleshooting...
  • Page 12 IC301 Troubleshooting C301 pin31, 32, 51, 88 power applied check Refer to power supply check IC301 pin6 PIN P-SENS “High” check P-SENS terminal check X301 oscilates or not X301 replacement When IC301 pin92 voltage input. High©Low©High RESET circuit check IC301 replacement IC601 Troubleshooting IC601 pin1 power check Refer to power supply check...
  • Page 13 Tuner pack power check TU601 pin2 +9v power check C675(+) DC power check Refer to IC909 troubleshooting PN602 pin4 GND check Pattern check Tuner pack Troubleshooting PLL -CE, DI, DO, CLK check PLL_CEL: Chip Enable DI: Data input DO: Data output operation check CLK: Tuner mode clock Tuner pack replacement...
  • Page 14 Rec check (Q252, Q202 ON : R273, R223 High) IC203 pin2, 8 signal input chek Q202, Q252 Base "Low" check Q202, 252 replacement IC501 pin9 “L” check IC203 pin3, 7 output check IC203 pin6 VCC power check L201 pin5 power check Power trouble check L201 pin1, 3 oscilates check C227(+) power input check...
  • Page 15 ❏ IC/TR VOLTAGE & PIN DESCRIPTION SYSTEM CONTROL PART. 1. MICOM LC87F67C8A Pin NO. Symbol Description Remarks RDS CLK RDS IC Clock PORT DVD-CE DVD CE supply PORT. REMOTE REMOCON SIGNAL INPUT PORT. T-MUTE TUNER MUTE Control PORT. P_SENS P-SENS signal input PORT. VOL B VOL DATA B INPUT PORT.
  • Page 16 Pin NO. Symbol Description Remarks VDD3 DC +5V FL19 FLT Plate voltage control signal output PORT. FL20 FLT Plate voltage control signal output PORT. -16.7 FL21 FLT Plate voltage control signal output PORT. FL22 FLT signal output PORT./ D5640/2640 FL23 FLT signal output PORT./ DTS FL24 FLT signal output PORT./ P-SAVE...
  • Page 17 MAIN PART 1. FUNCTION IC TDA7468D IC601 Pin NO. Symbol Description Remarks DC +9V DC 11V MIC signal input PORT. IN-L1 TAPE-L TAPE L-CH signal input PORT. IN-L2 TUNER-L TUNER L-CH signal input PORT. IN-L3 AUX-L AUX L-CH signal input PORT. IN-L4 CD-L CD L-CH signal input PORT.
  • Page 18 Pin NO. Symbol Description Remarks 4. NJM4580 IC610 OUT A A_CH AMPOUTPUT - IN A A_CH NF INPUT + IN A A_CH INPUT + IN B B_CH INPUT - IN B B_CH NF INPUT OUT B B_CH AMPOUTPUT DC +12V 5.
  • Page 19 Pin NO. Symbol Description Remarks 9. NJM2706 IC606 Capacitor terminal for LPF Monaural Amplifier Input MOUT Monaural Amplifier output Capacitor terminal for Attack Time Constant Capacitor terminal for Release Time Constant BASSFIL1 BASS Filter Terminal 1 BASSFIL2 BASS Filter Terminal 2 BASSVRIN BASS Effect Adjust Terminal BASSVROUT...
  • Page 20 4. MICOM EXPENDER IC BU2090 (IC501) Pin NO. Symbol Description Remarks GND. DATA DATA u-COM IC DATASIGNAL Recive. u-COM IC CLKSIGNAL Recive. DOOR_OPEN DOOR_CLOSE DECK Solenoid CONTROL. MOTOR DECK MOTOR CONTROL. REC_MUTE REC Signal Mute Control. PB_MUTE Playback Mute Control. REC_BIAS REC BIAS Power Control.
  • Page 21 3.MICOM EXPENDER IC BU2090 (IC703) Pin NO. Symbol Description Remarks GND. DATA DATA u-COM IC DATASIGNAL Recive. u-COM IC CLKSIGNAL Recive. RELAY speaker RELAY CONTROL. ECHO_B MIC ECHO adjument level ECHO_A MIC ECHO adjument level ECHO_C MIC ECHO adjument level. P_CTRL POWER IC CONTROL terminal control.

  • Page 22: Section 3. Dvd Part

    SECTION 3. DVD PART ❏ DVD ELECTRICAL TROUBLESHOOTING GUIDE 1. Power check flow - 3-1 -...
  • Page 23 2. Test & debug flow - 3-2 -...
  • Page 24 - 3-3 -...
  • Page 25 - 3-4 -...
  • Page 26 - 3-5 -...
  • Page 27 MEMO - 3-6 -...

  • Page 28: Section 5. Speaker Part

    SECTION 5. SPEAKER PART ❏ MODEL: LXS-D2640W - 5-1 -...
  • Page 29 MEMO - 5-2 -...

  • Page 30: Block Diagram

    ❏ BLOCK DIAGRAM 2-15 2-16...

  • Page 31: Schematic Diagram

    ❏ SCHEMATIC DIAGRAM • MAIN SCHEMATIC DIAGRAM 2-17 2-18...
  • Page 32 • AMP SCHEMATIC DIAGRAM 2-19 2-20...
  • Page 33 • FRONT SCHEMATIC DIAGRAM 2-21 2-22...
  • Page 34 • MIC/POWER SCHEMATIC DIAGRAM 2-23 2-24...
  • Page 35 • DECK SCHEMATIC DIAGRAM 2-25 2-26...

  • Page 36: Wiring Diagram

    ❏ WIRING DIAGRAM 2-27 2-28...

  • Page 37: Printed Circuit Diagram

    ❏ PRINTED CIRCUIT DIAGRAM • MAIN P.C BOARD DIAGRAM (SOLDER SIDE) 2-29 2-30...
  • Page 38 • MAIN P.C BOARD DIAGRAM (COMPONENT SIDE) 2-31 2-32...
  • Page 39 ❏ PRINTED CIRCUIT DIAGRAM • AMP P.C BOARD DIAGRAM (SOLDER SIDE) 2-33 2-34...
  • Page 40 • AMP P.C BOARD DIAGRAM (COMPONENT SIDE) 2-35 2-36...
  • Page 41 • FRONT P.C BOARD DIAGRAM (SOLDER SIDE) 2-37 2-38...
  • Page 42 • FRONT P.C BOARD DIAGRAM (COMPONENT SIDE) 2-39 2-40...
  • Page 43 • MIC P.C BOARD DIAGRAM 2-41 2-42...
  • Page 44 • POWER P.C BOARD DIAGRAM 2-43 2-44...
  • Page 45 MEMO MEMO 2-45 2-46...
  • Page 46 SECTION 3. DVD PART ❏ SCHEMATIC DIAGRAM • MPEG SCHEMATIC DIAGRAM...
  • Page 47 • RF & SERVO SCHEMATIC DIAGRAM 3-10...
  • Page 48 • I/O SCHEMATIC DIAGRAM 3-11 3-12...
  • Page 49 ❏ PRINTED CIRCUIT DIAGRAM • MIAN P.C BOARD DIAGRAM (SOLDER SIDE) 3-13 3-14...
  • Page 50 • MIAN P.C BOARD DIAGRAM (COMPONENT SIDE) 3-15 3-16...

  • Page 51: Section 4. Exploded Views

    SECTION 4. EXPLODED VIEWS ❏ CABINET AND MAIN FRAME SECTION (D2640) KEY+MIC ARRAY...

  • Page 52: Cabinet And Main Frame Section (Dp2640)

    ❏ CABINET AND MAIN FRAME SECTION (DP2640)

  • Page 53: Tape Deck Mechanism: Single Auto Reverse Deck

    ❏ TAPE DECK MECHANISM: SINGLE AUTO REVERSE DECK...

  • Page 54: Tape Deck Mechanism: Single Auto Deck (Optional)

    ❏ TAPE DECK MECHANISM: SINGLE AUTO DECK (OPTIONAL)

  • Page 55: Deck Mechanism Exploded View

    ❏ DECK MECHANISM EXPLODED VIEW(DP-7 OLD) 024A 024B 024A 011A 015A 015B 015C 4-10...
  • Page 56 (DP-9 NEW) Deck Mechanism Exploded View 015B 015A 012A 012A 035A 4 -11 4-12...

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Lxs-d2640w

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