LG LAC-5800, LAC-5810, LAC-5800-R, LACUA-580-R Service manual

MODELS : LAC5800(R)/LAC5810/LAC-UA580R

CAUTION

BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL

MODELS : LAC5800(R)/LAC5810/LAC-UA580R

SERVICE MANUAL

P/NO : AFN36957742

Website http://biz.lgservice.com

Internal Use Only

CAR CD/MP3/WMA RECEIVER

SERVICE MANUAL

FEBRUARY, 2008

1-1

CONTENTS

SECTION 1 SUMMARY

SERVICING PRECAUTIONS .........................................................................................................................1-2

ESD PRECAUTIONS ......................................................................................................................................1-3

SPECIFICATIONS ...........................................................................................................................................1-4

FIRMWARE UPGRADE METHOD.................................................................................................................1-5

HOW TO CONNECT AUDIO SET TO POWER SUPPLY............................................................................1-7

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS.................................................................2-1

1. MAIN, FRONT & TUNER PART................................................................................................................2-1

2. CDP PART.................................................................................................................................................2-4

3. USB PART.................................................................................................................................................2-7

• CIRCUIT VOLTAGE CHART......................................................................................................................2-9

• WAVEFORMS ...........................................................................................................................................2-10

INTERNAL BLOCK DIAGRAM OF ICs ......................................................................................................2-12

1. IC301 (HA13173AH) ...............................................................................................................................2-12

2. IC402 (µPD78F1165) ..............................................................................................................................2-14

3. IC503 (LC786923W) ...............................................................................................................................2-17

4. IC504 (AM5810) ......................................................................................................................................2-22

5. IC601 (BD3805F) ....................................................................................................................................2-24

6. IC801 (TB2926HQ) .................................................................................................................................2-25

7. IC901 (PT6524).......................................................................................................................................2-26

BLOCK DIAGRAM ........................................................................................................................................2-29

CIRCUIT DIAGRAMS....................................................................................................................................2-31

1. MAIN CIRCUIT DIAGRAM ......................................................................................................................2-31

2. FRONT CIRCUIT DIAGRAM...................................................................................................................2-33

3. CDP-1 CIRCUIT DIAGRAM ....................................................................................................................2-35

4. CDP-2 CIRCUIT DIAGRAM ....................................................................................................................2-37

5. AUX CIRCUIT DIAGRAM........................................................................................................................2-39

PRINTED CIRCUIT BOARD DIAGRAMS...................................................................................................2-41

1. MAIN P.C.BOARD(TOP VIEW) ...............................................................................................................2-41

2. MAIN P.C.BOARD(BOTTOM VIEW) .......................................................................................................2-43

3. FRONT P.C.BOARD................................................................................................................................2-45

4. CDP P.C.BOARD.....................................................................................................................................2-47

5. AUX P.C. BOARD....................................................................................................................................2-49

SECTION 3 EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION..................................................................................................3-1

2. MECHANISM(PICK-UP) SECTION ..........................................................................................................3-3

SECTION 4 REPLACEMENT PARTS LIST.................................................4-1

LGE Internal Use Only

1-2

1. 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.

2. Do not defeat any plug/socket B+ voltage interlocks with which instruments covered by this service manual might be equipped.

3. Do not apply power to this instrument and or any of its electrical assemblies unless all solid-state device heat sinks are correctly installed.

4. Always connect a test instrument’s ground lead to the instrument chassis ground before connecting the test instrument positive lead. Always remove the test instrument ground lead last.

1) The service 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 the characteristics of the unit. Always replace with the exact components.

3) An insulation tube or tape is sometimes used and some components are raised above the printed writing

board for safety. The internal wiring is sometimes clamped to prevent contact with heating components. Install them as they were.

4) After servicing always check that the removed screws, components and wiring have been installed correctly

and that the portion around the service part has not been damaged. Further check the insulation between the blades of attachment plug and accessible conductive parts.

SECTION 1 SUMMARY

SERVICING PRECAUTIONS

Only for training and service purposes

LGE Internal Use Only

1-3

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.

1. Immediately before handling any semiconductor component or semiconductor-equipped assembly,

drain off any electrostatic charge on your body by touching a know earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to the unit under test.

2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive

surface such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.

3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-stat-

ic" can generate electrical charges sufficient to damage ESD devices.

5. Do not use freon-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 protective material from the leads of a replacement ESD device, touch

the protective material to the chassis or circuit assembly into which the device will by installed.

CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE

ALL OTHER SAFETY PRECAUTIONS.

8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless

motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate static electricity sufficient to damage an ESD device).

CAUTION. GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH ARROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED "DANGEROUS VOLTAGE" THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK.

THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

LGE Internal Use Only

1-4

SPECIFICATIONS

• GENERAL

Output Power 50W x 4CH (Max.)

Power Source DC 12V

Speaker impedance 4Ω

Ground System Negative

Dimensions (WxHxD) 180 x 50 x 176 mm (Without Control Panel)

Net Weight 1.3 kg

• CD SECTION

Frequency Response 20 Hz-20 kHz

S/N Ratio 80 dB

Distortion 0.12%

Channel Separation (1kHz) 55 dB

• RADIO SECTION

Frequency Range 87.5-107.9, 87.5-108, 65-74 or 87.5-108 MHz

S/N Ratio 55 dB

Distortion 0.7%

Usable Sensitivity 12 dBµV

AM (MW)

Frequency Range 520-1720 or 522-1620 kHz

S/N Ratio 50 dB

Distortion 1.0%

Usable Sensitivity 28 dBµV

• AUX

Frequency Response 20 Hz-20 kHz S/N Ratio 80 dB Distortion 0.12 % Channel Separation (1kHz) 45 dB Max Input Level (1kHz) 1.2V (35KΩ)

Only for training and service purposes

LGE Internal Use Only

1-5

[ MAIN/CD FIRMWARE UPGRADE ]

FIRMWARE UPGRADE METHOD

1. Confirmation of version information

• Change the Source of audio set to tuner. (Default: tuner)

• Turn power off using power key.

• Press power key for 5 sec. (After power on, continue pressing)

• After 5 sec, beep sound rings two times. Then version information would show up at display.

• In order to check version of MAIN/CD system, Press band key.

• With beep Sound version of system for main, CD is displayed in sequence.

2. Upgrade Program reading

• Insert update CD in ACC on state and then [READING --> FILE CHK --> DOWNLORD?] is displayed in order

3. Upgrade start

• In order to start upgrade, Press INT key long (more then 2 sec) until “CHECK CD” Display on the LCD.

4. Upgrade progress display

• Upgrade is in progress now. [ Write --> I-VRF --> D-VRF ]

5. Upgrade Completion

• When Upgrade finished, the display shows up “DOWNLOADED”. After a while, the audio set is reset automatically.

•

Caution!

If power is off on the way of upgrading firmware, the set can’t be recovered. Therefore pay lots of attention for power not to be off.

LGE Internal Use Only

1-6

1. Confirmation of version information

• Change the source of audio set to tuner. (default : tuner)

• Turn power off using power key.

• Press power key for 5 secs. (After power is on, continue pressing)

• After 5 secs, beep sound rings two times. Then the version information would show up at display.

• In order to check version of USB system, press band key. With beep sound, version of systems for main, CD and USB is displayed in sequence.

2. Upgrade Preparation

• At first check that audio set is in tuner mode. With power key, turn it off. Make it sure to insert USB device which has upgrade file.

3. Upgrade start

• Press SRC key for 5 secs. After power is on, continue pressing. And then the audio set is changed to USB upgrade mode.

4. Upgrade progress display

• Upgrade is in progress now. It takes about 10 secs.

5. Upgrade completion

• Upgrade finished, the right display shows up. After a while, the audio set is reset automatically.

•

Caution!

If power is off on the way of upgrading firmware, the set can’t be recovered. Therefore pay lots of attention for power not to be off.

[ USB FIRMWARE UPGRADE ]

Only for training and service purposes

LGE Internal Use Only

1-7

HOW TO CONNECT AUDIO SET TO POWER SUPPLY

• It is sufficient only to supply power for upgrade.

• Shown from the right figure, connect yellow line (Battery) and red line (Ignition) to plus and minus terminal respectively.

• Jack is connected to the audio set via its shapes matched each other.

• We need power supply for operation of audio set (Voltage : 12~15V Current : Over 2A) Before connection between set and power supply, adjust voltage level to 15V typically (It is okay up to 12V.) Power Supply has a variety of shapes and capacity of voltage and current. At first check these things.

LGE Internal Use Only

1-8

Only for training and service purposes

LGE Internal Use Only

2-1

SECTION 2 ELECTRICAL

ELECTRICAL TROUBLESHOOTING GUIDE & WAVEFORMS

SYSTEM CONTROL

1. MAIN, FRONT & TUNER PART

No Symptom Check Point Location No.

1 No Power Checked the Fuse. CN302

Checked the Back up Vdd, Gnd. CN302(15,16)

Checked the Micom Back Up Vdd. IC301(14), D428,

IC402(30,47,50,99,100)

Checked the Micom Ground. IC402(20,51,97,98)

Checked the Reset. IC401, IC402(90)

Checked the X-tal. X401, X402

Checked the ACC In. Q301, Q302, IC402(40), CN302(14)

Checked the Detachable Switch. SW400, IC402(70)

Checked the Flipdown Switch. CN407(24), IC402(69)

Checked the Key Line. IC402(52,53)

2 Not available Remocon

Checked the Remocon Sens Vdd, Line.

CN404(5), IC402(81), RM901

3 Not available to Volume Control Checked the Encoder Volume. EV901, IC402(74,75)

4 Not available to Key Control Checked Tact Switch. SW901 ~ SW909, SW911 ~ SW919

Checked Key Line. IC402(52,53)

5 No sound Checked the E-VR Vdd. IC601(15)

Checked the E-VR Ground. IC601(1,22)

Checked the E-VR Control. IC601(20,21), IC402(3,4)

Checked the E-VR Signal In/Out. IC601(3,4,5,6,7,10,11)

IC601(12,13,14,15)

Checked the E-VR Mute Control IC601(19), IC402(14)

Checked the Power IC Vdd. IC801(6,20)

Checked the Power IC Ground. IC801(1,2,8,13,18,24)

Checked the Power IC Control. IC801(4,22), IC402(17,18)

Checked the Power IC Signal In/Out. IC801(11,12,14,15)

IC801(3,5,7,9,17,19,21,23)

6 No Line out signal Checked the E-VR Output. IC601(12,13,14,15)

Checked the Output. JK601

7 Not avaliable to Telephone Mute Checked the Telephone Mute Control. CN406(2)

Checked the Mute Control. IC402(38), Q312, Q313

8 Not avaliable to Checked the ANT Control. CN302(10), IC301(12,13), IC402(35)

ANT(Motor Type) Control

9 Not avaliable to Remote Checked the Remote Control. IC301(2), CN406(1), Q311

(Power AMP)

10 No output Beep sound. Checked the Beep Control. IC402(80), R801

LGE Internal Use Only

DISPLAY & LIGHTING

TUNER FUNCTION

2-2

No Symptom Check Point Location No.

1 No Display or Some Checked the LCD DRV Vdd. Q307, D425, IC901(56,57,58)

Display is Broken Checked the LCD DRV Ground. IC901(59)

Checked the LCD DRV OSC. IC901(60)

Checked the LCD DRV Control. IC402(73,76,78,79)

IC901(61,62,63,64)

Checked the LCD DRV to IC901(1~55)

LCD Pattern.

2 No LCD Lighting or Checked the LCD Lighting VDD. IC301(4,9), Q303

Color is different Checked the LED. LD961, LD962

3 Not avaliable to Checked the LCD Lighting Control. Q305, ZD426, CN302(11)

LCD Lighting Control Checked the LED. LD901 ~ LD923, LD931 ~ LD953

4 Don't moved Level Bar Checked the Level Meter Control. IC402(56,57,58)

5 Not avaliable to Dimmer Control Chekced the Dimmer Control. IC402(49), CN302(11), ZD426, Q305

1 Not available to Tuner Checked the Tuner Vdd. TU201(6,17), Q309, Q310

Checked the Tuner Ground. TU201(3,7,12,16)

Checked the PLL data. TU201(9,14,15,19,20)

IC402(1,2,5,6,55)

Checked the RF signal in. TU201(1,2)

Checked the S-Meter Control TU201(5)

2Tuner no sound Checked the Tuner Signal Out. TU201(10,11,12), IC601(10,11)

Checked the AF mute. TU201(8), IC402(7)

3 Not available to RDS Checked the RDS data. TU201(19,20), IC402(5,6)

Only for training and service purposes

LGE Internal Use Only

2-3

CAUTION - Tip for repair

Before exchange power amp IC(TB2926) for no audio problem, you have to check below list.

1. Check VCC (pin 20,6) & GND

2. Check input pin 11,12,14,15

3. Check Standby, pin 4

: Follow the below list.

4. Check Mute function, pin 22

: Follow the below list.

5. Check Ripple pin 10.

: Normally it is high (about 10V)

6. Re-soldering all the pin of IC.

: Prevent crack of solder line.

* Keep changed IC, We request that you send it to HQ.

Stand-by Power Sound Voltage

ON OFF OFF 0 to 1.5

OFF ON ON 3.5 to 6V

Mute Sound Voltage

ON OFF 0 to 1.5

OFF ON 3.5 to 6V

Picture 1) Power IC desc.

LGE Internal Use Only

PRE-GND

1 20 6

TAB V

CC1VCC2

()

OUT1

IN1

IN2

AC-GND

IN3

IN4

STBYRIP

10 25 22

OFF-SET

DET

PW-GND1

OUT1 ( )

OUT2 ( )

PW-GND2

OUT2 ( )

OUT3 ( )

PW-GND3

OUT3 ( )

OUT4 ( )

PW-GND4

OUT4 ( )

MUTE

5 V

PLAY

MUTE

: PRE-GND

: PW-GND

2-4

2. CDP PART

YES

CN520(6,29)

IC503(28,42,60,72,81,123,143)

IC504(7,8,20)

IC504(88)

X501

Fig 1, 2

Fig 3, 4

Fig 1, 2

CN506(2)

CN520(12,17)

CN506(1)

No Loading?

YES

Checked the CD Vdd?

YES

Checked the CD DSP Ground?

YES

Checked the Motor DRV VDD?

YES

Checked the CD DSP Reset?

YES

Checked the CD DSP X-tal?

YES

Checked the Disc in load switch?

YES

Checked the Loading Motor Control?

YES

Checked the 12/8Cm sens switch?

Something wrong With the CD Player?

Only for training and service purposes

LGE Internal Use Only

2-5

YES

CN506(8)

IC504(21)

CN520(12,17)

IC503(84,85,86,87)

IC503(38), IC504(15,16)

Fig 5

Fig 10~ 11

Fig 3, 4

Fig 1, 2

Fig 12

Fig 9

IC503(17)

CN520(25)

IC503(8)

Fig 7

IC503(41), IC504(11,12)

Fig 8

IC503(40), IC504(13,14)

Fig 6

IC503(39), IC504(17,18)

No Reading & "FILE CHECK" DISPLAY?

YES

Checked the Limit switch?

YES

Checked the Motor DRV mute control?

YES

Checked the Motor LODING Control?

YES

Checked the CD DSP Control?

YES

Checked the focus control?

YES

Checked the focus error level out.(FE Mon)?

YES

Checked the PLL locking.(FSEQ)?

YES

Checked the RF signal out check?

YES

Checked the spindle motor control?

YES

Checked the SLED control?

YES

Checked the tracking control?

Something wrong With the CD Player?

LGE Internal Use Only

2-6

YES

IC503(140,141)

CD no sound?

YES

Checked the DSP signal out?

Something wrong With the CD Player?

YES

CN403(1)[MAIN]

CN520(12,17)

Fig 3,4

No ejected the CD?

YES

Checked the Eject key?

YES

Checked the Loading Motor Control?

Something wrong With the CD Player?

Only for training and service purposes

LGE Internal Use Only

2-7

3. USB PART

YES

IC711(8,18,39)

IC711(5,19,40)

PN703(5)

X701

IC711(38,37)

Fig 13

PN703(4)

IC711(9,10,11,14)

Only "NO USB" or "USB CHECK" Display?

YES

Checked the USB Vdd?

YES

Checked the USB interface IC Ground?

YES

Checked the USB interface IC reset?

YES

Checked the USB interface IC X-tal?

YES

Checked the D+/D Port?

YES

Checked the USB indication Port?

YES

Checked the USB interface IC control?

Something wrong with the USB?

LGE Internal Use Only

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