LG LAC4710R Service Manual Download Page 5

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1-4

SPECIFICATIONS

• GENERAL

Output Power

50W x 4CH (Max.)

Power Source

DC 12V

Speaker impedance

Ω

Ground System

Negative

Dimensions (W x H x D)

180 x 51 x 171mm (Without Control Panel)

Net Weight

2.0kg

• CD SECTION

Frequency Response

20Hz ~ 20kHz

S/N Ratio

80dB

Distortion

0.12%

Channel Separation (1kHz)

55dB

• RADIO SECTION
FM

Frequency Range

65 ~ 74, 87.5 ~ 107.9 or 87.5 ~ 108MHz

S/N Ratio

53dB

Distortion

0.7%

Usable Sensitivity

12dBµV

AM (MW)

Frequency Range

520 ~ 1720 or 522 ~ 1620kHz

S/N Ratio

45dB

Distortion

1.0%

Usable Sensitivity

28dBµV

• AUX SECTION

Frequency Response

20Hz ~ 20kHz

S/N Ratio

80dB

Distortion

0.1%

Channel Separation (1kHz)

45dB

Max Input Level (1kHz)

1.1V (35K

Ω

)

Only for training and service purposes

LGE Internal Use Only

Summary of Contents for LAC4710R

Page 1: ...IVER SERVICE MANUAL MODEL LAC4710R CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL MODEL LAC4710R SERVICE MANUAL P NO AFN35097886 OCTOBER 2007 Website http biz lgservice com Internal Use Only ...

Page 2: ...6 6 IC901 PT6523 2 17 BLOCK DIAGRAM 2 19 CIRCUIT DIAGRAMS 2 21 1 MAIN CIRCUIT DIAGRAM 2 21 2 CDP CIRCUIT DIAGRAM 2 23 3 FRONT CIRCUIT DIAGRAM 2 25 4 AUX CIRCUIT DIAGRAM 2 27 5 LCD LIGHTING CIRCUIT DIAGRAM 2 28 PRINTED CIRCUIT DIAGRAMS 2 29 1 MAIN P C BOARD 2 29 2 CDP P C BOARD 2 33 3 FRONT P C BOARD 2 34 4 AUX P C BOARD 2 35 5 LCD LIGHTING P C BOARD 2 35 SECTION 3 EXPLODED VIEWS 1 CABINET AND MAIN...

Page 3: ...precautions are indicated or printed on the cabinet chassis or components When servicing follow the printed or indicated service precautions and service materials 2 The Components used in the unit have a specified conflammability and dielectric strength When replacing any components use components which have the same ratings Components marked in the circuit diagram are important for safety or for ...

Page 4: ...n propelled chemicals These can generate electrical charges sufficient to damage ESD devices 6 Do not remove a replacement ESD device from its protective package until immediately before you are ready to install it Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam aluminum foil or comparable conductive materials 7 Immediately before removing the ...

Page 5: ...tion 1kHz 55dB RADIO SECTION FM Frequency Range 65 74 87 5 107 9 or 87 5 108MHz S N Ratio 53dB Distortion 0 7 Usable Sensitivity 12dBµV AM MW Frequency Range 520 1720 or 522 1620kHz S N Ratio 45dB Distortion 1 0 Usable Sensitivity 28dBµV AUX SECTION Frequency Response 20Hz 20kHz S N Ratio 80dB Distortion 0 1 Channel Separation 1kHz 45dB Max Input Level 1kHz 1 1V 35KΩ Copyright 2007 LG Electronics ...

Page 6: ...ower IC Ground IC801 1 2 8 13 18 24 Checked the Power IC Control IC801 4 22 IC401 3 10 Checked the Power IC Signal in out IC801 11 12 14 15 IC801 3 5 7 9 17 19 21 23 Checked the Power IC Mute IC801 22 Checked the Power IC Standby IC801 4 Checked the Power IC Ripple IC801 10 Checked the Main Connector CN801 1 2 3 4 8 9 12 13 6 No Line out signal Checked the E VR Vdd IC301 10 IC601 16 Checked the E ...

Page 7: ...anged IC We request that you send it to HQ RL RL RL 11 9 8 7 5 2 3 17 18 19 21 24 23 12 15 14 1 20 6 RL IN1 IN2 IN3 IN4 13 C1 C1 C1 C1 PRE GND 10 25 22 OUT1 PW GND1 OUT1 OUT2 PW GND2 OUT2 OUT3 PW GND3 OUT3 OUT4 PW GND4 OUT4 TAB VCC1 VCC2 C 3 C 4 C 2 PRE GND PW GND STBY RIP MUTE C 5 16 C6 4 OFF SET DET MUTE PLAY 5 V R1 AC GND Stand by Power Sound Voltage ON OFF OFF 0 to 1 5 OFF ON ON 3 5 to 6V Mute...

Page 8: ...Vdd IC301 4 9 IC401 64 Checked the LED LD901 LD923 5 Don t moved Level bar Checked the Level Meter control IC401 54 57 6 Not avaliable to Dimmer control Chekced the Dimmer control CN801 11 Q303 Q304 IC301 4 9 No Symptom Check Point Location No TUNER FUNCTION 1 Not available to Tuner Checked the Tuner Vdd TU101 4 16 IC301 10 IC401 39 Q350 Q351 Checked the Tuner Ground TU101 3 5 10 17 Checked the PL...

Page 9: ... IC506 72 YES NO Checked the CD DSP reset X503 YES NO Checked the CD DSP X tal CN509 15 YES NO Fig 3 4 Fig 1 2 Fig 1 2 Checked the disc in load switch CN509 12 17 IC513 12 14 15 YES NO Checked the loading motor control CN509 10 YES NO Checked the 8 12cm sens switch 2 CD PART A B C Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 10: ...ontrol IC506 25 IC513 17 18 YES NO Checked the focus control IC506 25 R517 YES NO Checked the focus error level out FE mon IC506 54 YES NO Checked the PLL locking FSEQ IC506 41 16 YES NO Checked the RF signal out check IC506 21 IC513 8 5 YES NO Checked the spindle motor control PN504 5 6 YES NO Checked the TRVP control IC506 24 IC513 19 20 YES NO Checked the tracking control A Copyright 2007 LG El...

Page 11: ... NO Checked the Eject key YES D6 D5 NO Checked the loading motor control B CD no sound OK YES IC506 56 59 NO Checked the DSP signal out YES C Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 12: ...ding REW FEW SLED CON LOADING IN IC504 PIN13 IC504 PIN14 R5091 SLED CON R5465 LOAD IN SL SL SLED CON LOADING IN Fig 4 Motor control signal for unloading REW FEW SLED CON LOADING IN IC504 PIN13 IC504 PIN14 R5091 SLED CON R5465 LOAD IN SL SL SLED CON LOADING IN D6 REW D5 FEW R5091 SLED CON R5465 LOAD IN D6 REW D5 FEW R5091 SLED CON R5465 LOAD IN Copyright 2007 LG Electronics Inc All right reserved O...

Page 13: ...P T T TE Fig 7 Spindle control signal PLLF SP SP SPOUT Fig 8 PD RFOUT Fig 9 CLK REQ DATA PD MD RFOUT LOADING IN IC506 CLK PIN52 IC506 REQ PIN53 IC506 DATA PIN54 CLK REQ DATA IC506 PLLF PIN54 IC504 SP PIN11 IC504 SP PIN12 IC506 SPOUT PIN21 IC506 PD 41 IC506 RFOUT 46 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 14: ...IN57 IC506 STAT PIN71 IC506 MDATA PIN48 STAT NRST MDATA Fig 12 SLED control SL SL SL IC506 NRST PIN57 IC506 STAT PIN71 IC506 MDATA PIN48 IC504 PIN13 IC504 PIN14 R5091 SLED CON R5465 LOAD IN IC506 MLD PIN58 IC506 MCLK PIN70 IC506 MDATA PIN72 TRVP Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 15: ...EF EXTOUT VBUP DSPOUT CTL 2 2 5V CTL 3 2 5V CTL 4 2 5V 15 FREG F RFREG3 FREG B 13 12 11 10 9 8 7 6 5 4 3 2 1 14 3 5V DBUP CBUP 100uF CVDD 10uF CDSP 10uF CAUDIO 10uF CCD 0 1uF CEXT 10uF CILM 0 1uF CFREG 10uF QFREG RFREG1 RFREG2 DEXT1 DEXT2 C1 100uF C2 0 1uF Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 16: ...ts except VDD pin14 and FREG pin2 3 are switched off when the circuit operates revert to the original state when the temperature drops to a certain level Note3 Overvoltage protection circuit The overvoltage protection circuit surge protector turns off all outputs without Vdd when VB voltage is more than about 21V And the overvoltage protection circuit surge protector turns off Vdd output with othe...

Page 17: ...CLK O PCDP_DI I PCDP_DO O PFRT_RST O PFRT_OPEN I PFRT_DETECT I PART_TX O PART_RX I PART_EN I PSD_ST I PPLL_CE O PEEPROM_CE O PDIM_IN I PRDS_DI I PPWR O PREMOTE O PTEL_MUTE I PAUDIO_MUTE O PAUX_MUTE O PLIGHT O PDIM_OUT O PEJECT I PQUALTY I PSMETER I PLEVEL_METER I PKEY2 I PKEY1 I AVss PEV_CLK O PEV_CE O PPWR_MUTE O PAF_MUTE O PRMC I PSOFT_MUTE O PEALA_SW1 O PEALA_SW2 O PSPEC_CLK O PSTANDBY O PDECK_...

Page 18: ...h upgrade enable 27 P86 EX6 PUSB_POWER PBT I O O CMOS USB power on BT power on 3 3V Ctrl 28 P87 EX7 PUSB_SW I O I USB device detect sw 29 P30 INTP3 RTC1HZ PUSB_RESET I O O CMOS OTG reset 30 EVDD1 Positive power supply for ports 31 P50 EX8 PUSB_PROTECT I O I Protection IC overcurrent detection 32 P51 EX9 POPT_IN0 I O For diode option check signal 1 or 2 input0 33 P52 EX10 POPT_IN1 I O I For diode o...

Page 19: ... detect 75 P145 TI07 TO07 PFRT_RST I O O CMOS Front micom LCD drv reset 76 P144 SO20 TxD2 PCDP_DO I O O CMOS Data output for CDP 77 P143 SI20 RxD2 SDA2 PCDP_DI I O I Data input for CDP 78 P142 SCK20 SCL2 PCDP_CLK I O O CMOS CLK output for CDP 79 P141 PCLBUZ1 INTP7 PFRT_CE I O I Data enable output to front micom LCD drv 80 P140 PCLBUZ0 INTP6 PBEEP I O O CMOS Buzzer output 81 P120 INTP0 EXLVI PEXLVI...

Page 20: ... step Bass Treble Middle 15dB 15dB 1dB step Tone Pass Input Gain 0 15dB 1dB step Mute Volume 23 79dB dB 1dB step Input Gain 0 15dB 1dB step Mute Input Selector 4 stereo include 1 isolation input AGND FIL AP1 AP2 AN VCC 2 50k 50k 50k 50k 50k 50k 50k 50k Bass fo 60 70 80 100 120 140 160 200Hz Q 0 5 0 75 1 1 25 Middle fo 500Hz 1kHz Q 1 Treble fo 5 7 5 10 12 5kHz 22 21 20 19 18 17 16 15 14 13 12 Copyr...

Page 21: ...3 C1 C1 C1 C1 PRE GND 10 25 22 OUT1 PW GND1 OUT1 OUT2 PW GND2 OUT2 OUT3 PW GND3 OUT3 OUT4 PW GND4 OUT4 TAB VCC1 VCC2 C 3 C 4 C 2 PRE GND PW GND STBY RIP MUTE C 5 16 C6 4 OFF SET DET MUTE PLAY 5 V R1 AC GND Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only ...

Page 22: ...7 8 9 10 11 12 13 14 15 16 8 54 49 55 50 56 51 57 52 58 53 59 60 61 62 63 64 SG17 SG18 SG19 SG20 SG21 SG24 SG29 SG23 SG28 SG22 SG25 SG30 SG26 SG31 SG27 SG32 SG38 SG33 SG39 SG34 SG40 SG35 SG41 SG36 SG42 SG37 SG43 SG44 SG45 SG46 SG47 SG48 COM2 SG49 COM3 SG50 VDD SG51 INH SG52 VDD1 COM1 VDD2 OSC CE CLK DI VSS Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes ...

Page 33: ...282 277 278 271 273 283 258 255 257 254 256 252 253 453 250 457 251 454 270 264 265 285 266 284 261 260 274 272 280 LCD1 279 275 262 267 269 268 453 Accessory Loc No Loc No Loc No Loc No Loc No Loc No 835 801 808 818 850 900 450 CDP A26 458 458 A41 CABLE1 Copyright 2007 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only A49 ...

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