LG TCH-M1000 Service Manual
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LG TCH-M1000 Service Manual

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• SERVICING PRECAUTIONS .......................................................................................................... 1-2
• ESD PRECAUTIONS ....................................................................................................................... 1-3
• SPECIFICATIONS ........................................................................................................................... 1-4
• ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................. 2-1
• CD PART TROUBLESHOOTING GUIDE ......................................................................................... 2-3
• WAVEFORMS OF MAJOR CHECK POINT .................................................................................. 2-11
• INTERNAL BLOCK DIAGRAM of ICs ............................................................................................ 2-13
• BLOCK DIAGRAM ......................................................................................................................... 2-25
• SCHEMATIC DIAGRAM ................................................................................................................ 2-27
• MAIN SCHEMATIC DIAGRAM ...................................................................................................... 2-29
• CDP SCHEMATIC DIAGRAM ....................................................................................................... 2-31
• PRINTED CIRCUIT DIAGRAM ...................................................................................................... 2-33
• EXPLODED VIEW ........................................................................................................................... 3-1
SECTION 4. REPLACEMENT PARTS LIST
[CONTENTS]
.................................................................... 4-1
- 1-1 -

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Summary of Contents for LG TCH-M1000

  • Page 1: Table Of Contents

    [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 .................. 2-11 •...

  • Page 2: 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 3: Esd Precautions

    ESD PRECAUTIONS [Electrostatically Sensitive Devices (ESD)] Some semiconductor (solid state) devices can be damaged easily by static electricity. Such omponents 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 4: Specifications

    SPECIFICATIONS 1. GENERAL Power requirements ........................DC12V~15V Ground system ........................... Negative Dimensions(W x H x D) ...................... 188 x 58 x 166mm Weight .............................. Net: 1.3kg 2. RADIO SECTION AM(MW) Frequency range 65.0~74.0MHz(Optional), 522~1,620kHz 87.5~108MHz (Optional:530~1,710kHz/ 520~1,620kHz) Intermediate frequency 10.8MHz 450kHz Usable sensitivity 12dBµV...

  • Page 5: 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,PN505, IC401 Pin27 Check laser circuitry. Does initial reading occur? Q501, IC502 Check focusing circuitry.
  • Page 6 (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? Pin10 IC201 Surrounding circuit defective.
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  • Page 15: 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 16 #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 - 2-12 -...

  • Page 17: Internal Block Diagram Of Ics

    INTERNAL BLOCK DIAGRAM of ICs IC401 LC875465B 1) PORT ASSIGNMENT - 2-13 -...
  • Page 18 2) PORT DESCRIPTION - 2-14 -...
  • Page 19 Name in Micom Name in Model Description PCD_SW2 In MD, SW2 state input. Refer to CD Player. PCD_PWR DSP power suppler ON ouptut PCD_FWD In MD, load motor "forward" command output PCD_F PCD_R Function Open mode High Reverse High Forward High High Break mode...
  • Page 20 Name in Micom Name in Model Description I /O PC6/A6 PPWR_MUTE To power amp, "MUTE" command output Mute(High), Sound(Low) PC5/A5 PEV_CLK Clock for interface with volume controller PC4/A4 PEV_DO To volume controller, data output System Power supplier ON output PC3/A3 PPWR On(High), Off(Low) From ISO jack, ACC signal input...
  • Page 21 2) Block Diagram - 2-17 -...
  • Page 22 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 23 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 24 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 - 2-20 -...
  • Page 25 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 26: Block Diagram

    IC505 AMC1117 BLOCK DIAGRAM - 2-22 -...
  • Page 27 IC601 PT2313L LOUT LOUD_L BOUT_L BIN_L TREB_L Speaker LFOUT LIN1 LIN1 Mute LIN2 LIN2 Speaker LIN3 Voume & Bass Treble LIN3 Loudness Input LROUT Selector Mute RIN3 & Gain RIN3 Serial Bus Decoder & Latches RIN2 Control RIN2 DATA RIN1 RIN1 DGND Speaker...
  • Page 28 IC801 TDA8571J V P1 V P2 V P3 V P4 MODE OUT1+ 30 K • OUT1- OUT2+ 30 K • OUT2- SGND V DIAG DIAGNOSTIC OUT3+ 30 K • OUT3- V ref OUT4+ 30 K • OUT4- MGG153 PGND1 PGND2 PGND3 PGND4 IC901 LC75811...
  • Page 29 BLOCK DIAGRAM POWER AMP L-SPEAKER 2(FL,FR) TDA8571 10,11 24,25 FRONT R-SPEAKER LINE SW/E.VOLUME 10,14 13,14 22,23 2(RL,FR) L-SPEAKER 17,19 13,19 10,14 REAR TU101 20,22 R-SPEAKER 11,12 1,8,16,23 OP AMP 9.4V REG CET85XX 2(LR) S4560 Q360,ZD361 MUTE 16,17, LINE-OUT CCNTROL 18,19 4,14 (OPTION) 4-CH...

  • Page 30: Main Schematic Diagram

    MAIN SCHEMATIC DIAGRAM 2-27 2-28...
  • Page 31 FRONT SCHEMATIC DIAGRAM 2-29 2-30...

  • Page 32: Cdp Schematic Diagram

    CDP SCHEMATIC DIAGRAM 2-31 2-32...

  • Page 33: Printed Circuit Diagram

    PRINTED CIRCUIT DIAGRAM 2. FRONT P.C. BOARD 1. LED P.C.BOARD (COMPONENT SIDE) (COMPONENT SIDE) 2-33 2-34...
  • Page 34 3. MAIN P.C. BOARD (SOLDER SIDE) 2-35 2-36...
  • Page 35 4. CDP P.C. BOARD(COMPONENT SIDE) 2-37 2-38...
  • Page 36 2-39 2-40...

  • Page 37: Section 3. Cabinet Main Chassis & Mechanism

    SECTION 3. CABINET MAIN CHASSIS & MECHANISM EXPLODED VIEW CAUTION NOTE) Refer to “SECTION 4 REPLACEMENT PARTS LIST” in order to look for the Exposed blade will cause part number of each part. severe injury...

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