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LG LAC-M8410R Service Manual
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LG LAC-M8410R Service Manual

LG LAC-M8410R Service Manual

Cd/mp3/wma player receiver car stereo
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CD/MP3/WMA Player Receiver
Car Stereo
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
MODEL : LAC-M8410R

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Summary of Contents for LG LAC-M8410R

  • Page 1 CD/MP3/WMA Player Receiver Car Stereo SERVICE MANUAL CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. MODEL : LAC-M8410R...
  • Page 2 [CONTENTS] ❍ SECTION 1. SUMMARY • SERVICING PRECAUTIONS ......................1-2 • ESD PRECAUTIONS ........................1-3 • SPECIFICATIONS ........................... 1-4 SECTION 2. ELECTRICAL ❍ • ELECTRICAL TROUBLESHOOTING GUIDE ................. 2-1 • CD PART TROUBLESHOOTING GUIDE ..................2-3 • WAVEFORMS OF MAJOR CHECK POINT .................. 2-12 •...

  • Page 3: Section 1. Summary

    SECTION 1. SUMMARY ❏ SERVICING PRECAUTIONS – Always disconnect the power source before: 1) Removing or reinstalling any component, circuit board, module or any other instrument assembly. 2) Disconnecting or reconnecting any instrument electrical plug or other electrical connection. 3) Connecting a test substitute in parallel with an electrolytic capacitor in the instrument. CAUTION: A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

  • Page 4: 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 5: Specifications

    ❏ SPECIFICATIONS General Output Power 50W x 4CH(Max.) Power Source DC 12V 4 Ω Speaker impedance Ground System Negative type Dimensions (W x H x D) 185 x 50 x 170 mm (Without Front Panel) Net Weight (approx.) 1.8 kg FM tuner Frequency Range 87.5-108 MHz...

  • Page 6: Section 2. Electrical

    SECTION 2. ELECTRICAL ❏ ELECTRICAL TROUBLESHOOTING GUIDE (1) No Power. Any Key power on. Check power supply circuitry. Q260, Q380, Q381, IC401 Is power turnd on? IC201 Pin2 Check loading supply circuitry. DISC loading? Q350,Q351,CN505, IC401 Pin84 Check laser circuitry. Does initial reading occur? Q501, IC502 Check focusing circuitry.
  • Page 7 (2) LCD light abnornal. Any Key power on. (without DISC) Power supply circuitry Check voltage in the power defective. Do display LCD then light? supply circuitry. Q380,Q381,IC403 Is u-com IC401 reset circuit Reset circuit defective. normal? Pin11 IC821 Surrounding circuit defective.
  • Page 8 (3) No Hands Free Hand Free key on. Check whether is power Is H/F on? output (3.3V) to IC502 pin2. Does reset circuit appear normally to IC501 pin56? Defect to IC503 3.3V Is it oscillates to IC501 pin 23, 24 by X501 oscillator? Defect to X501, C505, C506.
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  • Page 17: Waveforms Of Major Check Point

    ❏ WAVEFORMS OF MAJOR CHECK POINT #1. MICOM INTERFACE WAVEFORM #2. SLED DRIVE AND MOTOR WAVEFORM (CN503 1 9,2 1 ,1 8,20) during normal play (IC504 pin5, 1 4) when focus search #3. FOCUS DRIVE AND MOTOR WAVEFORM (R5 1 3, IC504 pin 1 5) •...
  • Page 18 #4. SPINDLE DRIVE AND MOTOR WAVEFORM #5. TRACK DRIVE AND MOTOR WAVEFORM (IC504 pin6, 1 2) when TOC reading (R508, IC504 pin23) during normal play #6. RF, TRACKING AND FOCUS ERROR WAVEFORM (IC502 pin8, 2 1 , 23) during normal play - 2-13 -...

  • Page 19: Internal Block Diagram Of Ics

    ❏ INTERNAL BLOCK DIAGRAM of ICs I IC401 LC876B 1) PORT ASSIGNMENT 2) PORT DESCRIPTION Name in Micom Name in Model Enable I/O I/O setted Output Format Descripation P16/T1PWML PEV_DO CMOS To volume controller, data output P17/T1PWMH/BUZ PBEEP CMOS Beep sound output SI2P0/SO2 PMCM_DO CMOS...
  • Page 20 Name in Micom Name in Model Enable I/O I/O setted Output Format Descripation X’tal 9.8304 MHz VDD1 Power supply +5V P80/AN0 PLVL_MTR N-ch Sound level’s signal input P81/AN1 PS_MTR N-ch Radio station’s strength signal input P82/AN2 PAF_MUTE N-ch To tuner pack, AF mute output P83/AN3 PHF_CTR N-ch...

  • Page 21: Pin Configuration (Top View)

    I IC501 MSM7731 (MAIN) 1) PIN CONFIGURATION (TOP VIEW) - 2-16 -...

  • Page 22: Block Diagram

    2) BLOCK DIAGRAM - 2-17 -...
  • Page 23 I IC501 MN6627932 (CD) 1) PORT ASSIGNMENT - 2-18 -...
  • Page 24 2) Block Diagram TXTCK MICRO CO MPUTER TIMING DS L, PLL, VCO TXTD INTERACE GE NERATOR DQSY SU BCODE S BCK INTERFACE SU BC TXTD/SMCK NCLDCK DQSY FLAG BLKCK EFM DEMODULATION ADPVCC S YNC INTERP OLATION CIRC SPINDLE CIRC ECC DECORDER SERVO CDROM ECC...
  • Page 25 3) PORT DESCRIPTION Pin No. Symbol Function DRAM data signal I/O 11 DRAM data signal I/O 10 DRAM data signal I/O 9 DRAM data signal I/O 8 UDQM SDRAM upper byte data mask signal output SDRCK SDRAM clock signal output DRAM address signal output 11 DRAM address signal output 9 DRAM address signal output 8...
  • Page 26 Pin No. Symbol Function LOOUTR R-ch audio output for line-out output LOVDD1 Power supply for line-out output N.C. TMON1 Test monitor output 1 N.C. N.C. TMON2 Test monitor output 2 DVDD3 Power supply 3 for digital circuits DVSS2 Ground 2 for digital circuits *EXT0 Expansion I/O port 0 *EXT1...
  • Page 27 I IC503 M12L16161A 1) PORT ASSIGNMENT 2) Block Diagram Data Input Regidter Bank Select LDQM 512K x 16 512K x 16 Column Decoder Latency & Burst Length LCKE Programming Register LRAS LDQM LCBR LCAS LWCBR Timing Register L(U)DQM - 2-22 -...
  • Page 28 3) PIN Function table Name Input Function System Clock Active on the positive going edge to sample all inputs. Disables or enables device operation by masking or enabling all inputs except Chip Select CLK, CKE and L(U)DQM. Masks system clock to freeze operation from the next clock cycle. CKE Clock Enable should be enabled at least one cycle prior to new command.
  • Page 29 I IC505 AMC1117 1) Block Diagram - 2-24 -...
  • Page 30 I IC599 BA6289F/BA6417F 1) Block Diagram 2) Pin descriptions - 2-25 -...

  • Page 31: Pin Connection

    I IC601 TDA7437T 1) PINCONNECTION 44 43 42 41 38 37 36 35 34 TREB_R OUT_RF IN_R OUT_LR MUXOUT_R MID_LI LOUD_R MID_LO DIFFGND_R OUT_RR DIFF_R SMEXT STEREO4_R BASS_RO STEREO1_R BASS_RI STEREO2_R BASS_LO STEREO3_R BASS_LI MONO MID_RO 12 13 14 15 16 18 19 20 21 22 D96AU435B - 2-26 -...
  • Page 32 2) BLOCK DIAGRAM - 2-27 -...
  • Page 33 I IC602 S4560 I IC801 TA8275H 1) BLOCK DIAGRAM 1) BLOCK DIAGRAM - 2-28 -...
  • Page 34 I IC901 µPD703260GC-105-8EA 1) PORT DESCRIPTION Name in Micom Name in Model Enable I/O I/O setted Descripation AVREFO AVREFO Analog reference voltage(3.3V) AVSS AVSS Analog ground P10/ANO0 PVOLA Volume encoder A Pin input P11/ANO1 PVOLB Volume encoder B Pin input AVREF1 AVREF1 Analog reference voltage(3.3V)
  • Page 35 Name in Micom Name in Model Enable I/O I/O setted Descripation P04/INTP1 PMCM_CE Chip select input from main micom P05/INTP2//DRST Open P06/INTP3 PRMC Remote controller input P40/SIB0/SDA01 PMµDI Serial data input from main micom P41/SOB0/SCL01 PMµCLK Serial data output to main micom P42//SCKB0 PMµCLK Serial clock for interface with main micom...
  • Page 36 I IC902 MR27V3202F 1) PIN CONFIGURATION (TOP VIEW) 2) BLOCK DIAGRAM - 2-31 -...

  • Page 37: Pin Descriptions

    3) PIN DESCRIPTIONS I LCD MODULE 1) BLOCK DIAGRAM - 2-32 -...

  • Page 38: Pin Assignment

    2) PIN ASSIGNMENT - 2-33 -...
  • Page 39 - 2-34 -...
  • Page 40 ❏ BLOCK DIAGRAM 2-35 2-36...

  • Page 41: Main Schematic Diagram

    ❏ MAIN SCHEMATIC DIAGRAM 2-37 2-38...

  • Page 42: Front Schematic Diagram

    ❏ FRONT SCHEMATIC DIAGRAM 2-39 2-40...
  • Page 43 ❏ CDP SCHEMATIC DIAGRAM 2-41 2-42...
  • Page 44 ❏ H/F & MOTOR SCHEMATIC DIAGRAM 2-43 2-44...

  • Page 45: Printed Circuit Diagram

    ❏ PRINTED CIRCUIT DIAGRAM 1. LED P.C.BOARD 2. FRONT P.C. BOARD (BOTTOM SIDE) 2-45 2-46...
  • Page 46 2. FRONT P.C. BOARD (TOP SIDE) 2-47 2-48...

  • Page 47: Main P.c.board

    3. MAIN P.C. BOARD (BOTTOM SIDE) 2-49 2-50...
  • Page 48 3. MAIN P.C. BOARD (TOP SIDE) 2-51 2-52...
  • Page 49 4. CDP P.C. BOARD 2-53 2-54...

  • Page 50: Section 3. Exploded Views

    SECTION 3. EXPLODED VIEWS I CABINET AND MAIN FRAME SECTION *Option *Option...
  • Page 52 ❏ Accessory part *Option - 3-5 -...

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