LG DF-599-X Service manual

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DVD VIDEO PLAYER

SERVICE MANUAL

MODEL : DF599X(DF9912EH)

MODEL : DF599X(DF9912EH)SERVICE MANUAL

P/NO : 3829RHP040R MARCH,2005

CAUTION

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

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CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .REPLACEMENT PARTS LIST

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SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

........................... 1-3

SERVICING PRECAUTIONS .................................................................................................. 1-4

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SPECIFICATIONS ...................................................................................................................... 1-5

1-2

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1-3

CAUTION : DO NOT ATTEMPT TO MODIFY THIS PRODUCT IN ANY WAY, NEVER PERFORM CUSTOMIZED INSTALLATIONS WITHOUT MANUFACTURER’S APPROVAL. UNAUTHORIZED MODIFICATIONS WILL NOT ONLY VOID THE WARRANTY, BUT MAY LEAD TO YOUR BEING LIABLE FOR ANY RESULTING PROPERTY DAMAGE OR USER INJURY.

SERVICE WORK SHOULD BE PERFORMED ONLY AFTER YOU ARE THOROUGHLY FAMILIAR WITH ALL OF THE FOLLOWING SAFETY CHECKS AND SERVICING GUIDELINES. TO DO OTHERWISE, INCREASES THE RISK OF POTENTIAL HAZARDS AND INJURY TO THE USER.

WHILE SERVICING, USE AN ISOLATION TRANSFORMER FOR PROTECTION FROM A.C. LINE SHOCK.

SAFETY CHECKS

AFTER THE ORIGINAL SERVICE PROBLEM HAS BEEN CORRCTED. A CHECK SHOULD BE MADE OF THE FOLLOWING.

SUBJECT : FIRE & SHOCK HAZARD

1. BE SURE THAT ALL COMPONENTS ARE POSITIONED IN SUCH A WAY AS TO AVOID POSSIBILITY OF ADJACENT COMPONENT SHORTS. THIS IS ESPECIALLY IMPORTANT ON THOSE MODULES WHICH ARE TRANSPORTED TO AND FROM THE REPAIR SHOP.

2. NEVER RELEASE A REPAIR UNLESS ALL PROTECTIVE DEVICES SUCH AS INSULATORS, BARRIERS, COVERS, SHIELDS, STRAIN RELIEFS, POWER SUPPLY CORDS, AND OTHER HARDWARE HAVE BEEN REINSTALLED PER ORIGINAL DESIGN. BE SURE THAT THE SAFETY PURPOSE OF THE POLARIZED LINE PLUG HAS NOT BEEN DEFEATED.

3. SOLDERING MUST BE INSPECTED TO DISCOVER POSSIBLE COLD SOLDER JOINTS, SOLDER SPLASHES OR SHARP SOLDER POINTS. BE CERTAIN TO REMOVE ALL LOOSE FOREIGN PARTICLES.

4. CHECK FOR PHYSICAL EVIDENCE OF DAMAGE OR DETERIORATION TO PARTS AND COMPONENTS. FOR FRAYED LEADS, DAMAGED INSULATION (INCLUDING A.C. CORD). AND REPLACE IF NECESSARY FOLLOW ORIGINAL LAYOUT, LEAD LENGTH AND DRESS.

5. NO LEAD OR COMPONENT SHOULD TOUCH A RECIVING TUBE OR A RESISTOR RATED AT 1 WATT OR MORE. LEAD TENSION AROUND PROTRUNING METAL SURFACES MUST BE AVOIDED.

6. ALL CRITICAL COMPONENTS SUCH AS FUSES, FLAMEPROOF RESISTORS, CAPACITORS, ETC. MUST BE REPLACED WITH EXACT FACTORY TYPES, DO NOT USE REPLACEMENT COMPONENTS OTHER THAN THOSE SPECIFIED OR MAKE UNRECOMMENDED CIRCUIT MODIFICATIONS.

7. AFTER RE-ASSEMBLY OF THE SET ALWAYS PERFORM AN A.C. LEAKAGE TEST ON ALL EXPOSED METALLIC PARTS OF THE CABINET, (THE CHANNEL SELECTOR KNOB, ANTENNA TERMINALS. HANDLE AND SCREWS) TO BE SURE THE SET IS SAFE TO OPERATE WITHOUT DANGER OF ELECTRICAL SHOCK. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST USE AN A.C. VOLTMETER, HAVING 5000 OHMS PER VOLT OR MORE SENSITIVITY, IN THE FOLLOWING MANNER; CONNECT A 1500 OHM 10 WATT RESISTOR, PARALLELED BY A .15 MFD. 150.V A.C TYPE CAPACITOR BETWEEN A KNOWN GOOD EARTH GROUND (WATER PIPE, CONDUIT, ETC.) AND THE EXPOSED METALLIC PARTS, ONE AT A TIME. MEASURE THE A.C. VOLTAGE ACROSS THE COMBINATION OF 1500 OHM RESISTOR AND .15 MFD CAPACITOR. REVERSE THE A.C. PLUG AND REPEAT A.C. VOLTAGE MEASUREMENTS FOR EACH EXPOSED METALLIC PART. VOLTAGE MEASURED MUST NOT EXCEED 75 VOLTS R.M.S. THIS CORRESPONDS TO 0.5 MILLIAMP A.C ANY VALUE EXCEEDING THIS LIMIT CONSTITUTES A POTENTIAL SHOCK HAZARD AND MUST BE CORRECTED IMMEDIATELY.

SUBJECT: GRAPHIC SYMBOLS

THE LIGHTNING FLASH WITH APROWHEAD 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 INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

SUBJECT : X-RADIATION

1. BE SURE PROCEDURES AND INSTRUCTIONS TO ALL SERVICE PERSONNEL COVER THE SUBJECT OF X-RADIATION. THE ONLY POTENTIAL SOURCE OF X-RAYS IN CURRENT T.V. RECEIVERS IS THE PICTURE TUBE. HOWEVER, THIS TUBE DOES NOT EMIT X-RAYS WHEN THE HIGH VOLTAGE IS AT THE FACTORY SPECIFIED LEVEL. THE PROPER VALUE IS GIVEN IN THE APPLICABLE SCHEMATIC. OPERATION AT HIGHER VOLTAGES MAY CAUSE A FAILURE OF THE PICTURE TUBE OR HIGH VOLTAGE SUPPLY AND, UNDER CERTAIN CIRCUMSTANCES, MAY PRODUCE RADIATION IN EXCESS OF DESIRABLE LEVELS.

2. ONLY FACTORY SPECIFIED C.R.T. ANODE CONNECTORS MUST BE USED. DEGAUSSING SHIELDS ALSO SERVE AS X-RAY SHIELD IN COLOR SETS, ALWAYS RE-INSTALL THEM.

3. IT IS ESSNTIAL THAT SERVICE PERSONNEL HAVE AVAILABLE AN ACCURATE AND RELIABLE HIGH VOLTAGE METER. THE CALIBRA TION OF THE METER SHOULD BE CHECKED PERIODICALLY AGAINST A REFERENCE STANDARD, SUCH AS THE ONE AVAILABLE AT YOUR DISTRIBUTOR.

4. WHEN THE HIGH VOLTAGE CIRCUITRY IS OPERATING PROPERLY THERE IS NO POSSIBILITY OF AN X-RADIATION PROBLEM. EVERY TIME A COLOR CHASSIS IS SERVICED. THE BRIGHTNESS SHOULD BE RUN UP AND DOWN WHILE MONITORING THE HIGH VOLTAGE WITH A METER TO BE CERTAIN THAT THE HIGH VOLTAGE DOES NOT EXCEED THE SPECIFIED VALUE AND THAT IT IS REGULATING CORRECTLY, WE SUGGEST THAT YOU AND YOUR SERVICE ORGANIZATION REVIEW TEST PROCEDURES SO THAT VOLTAGE REGULATION IS ALWAYS CHECKED AS A STANDARD SERVICING PROCEDURE. AND THAT THE HIGH VOLTAGE READING BE RECORDER ON EACH CUSTOMER’S INVOICE.

5. WHEN TROUBLESHOOTING AND MAKING TEST MEASUREMENTS IN A PRODUCT WITH A PROBLEM OF EXCESSIVE HIGH VOLTAGE, AVOID BEING UNNECESSARILY CLOSE TO THE PICTURE TUBE AND THE HIGH VOLTAGE SUPPLY. DO NOT OPERATE THE PRODUCT LONGER THAN IS NECESSARY TO LOCATE THE CAUSE OF EXCES SIVE VOLTAGE.

6. REFER TO HV. B+ AND SHUTDOWN ADJUSTMENT PROCEDURES DESCRIBED IN THE APPROPRIATE SCHEMATIC AND DIAGRAMS (WHERE USED).

SUBJECT: IMPLOSION

1. ALL DIRECT VIEWED PICTURE TUBES ARE EQUIPPED WITH AN INTE GRAL IMPLOSION PROTECTION SYSTEM, BUT CARE SHOULD BE TAKEN TO AVOID DAMAGE DURING INSTALLATION, AVOID SCRATCHING THE TUBE. IF SCRATCHED REPLACE IT.

2. USE ONLY RECOMMENDED FACTORY REPLACEMENT TUBES.

SUBJECT : TIPS ON PROPER INSTALLATION

1. NEVER INSTALL ANY PRODUCT IN A CLOSED-IN RECESS, CUBBYHOLE OR CLOSELY FITTING SHELF SPACE. OVER OR CLOSE TO HEAT DUCT, OR IN THE PATH OF HEATED AIR FLOW.

2. AVOID CONDITIONS OF HIGH HUMIDITY SUCH AS: OUTDOOR PATIO INSTALLATIONS WHERE DEW IS A FACTOR, NEAR STEAM RADIATORS WHERE STEAM LEAKAGE IS A FACTOR, ETC.

3. AVOID PALCEMENT WHERE DRAPERIES MAY OBSTRUCT REAR VENTING. THE CUSTOMER SHOULD ALSO AVOID THE USE OF DECORATIVE SCARVES OR OTHER COVERINGS WHICH MIGHT OBSTRUCT VENTILATION.

4. WALL AND SHELF MOUNTED INSTALLATIONS USING A COMMERCIAL MOUNTING KIT. MUST FOLLOW THE FACTORY APPROVED MOUNTING INSTRUCTIONS A PRODUCT MOUNTED TO A SHELF OR PLATFORM MUST RETAIN ITS ORIGINAL FEET (OR THE EQUIVALENT THICKNESS IN SPACERS) TO PROVIDE ADEQUATE AIR FLOW ACROSS THE BOTTOM, BOLTS OR SCREWS USED FOR FASTENERS MUST NOT TOUCH ANY PARTS OR WIRING. PERFORM LEAKAGE TEST ON CUSTOMIZED INSTALLATIONS.

5. CAUTION CUSTOMERS AGAINST THE MOUNTING OF A PRODUCT ON SLOPING SHELF OR A TILTED POSITION, UNLESS THE PRODUCT IS PROPERLY SECURED.

6. A PRODUCT ON A ROLL-ABOUT CART SHOULD BE STABLE ON ITS MOUNTING TO THE CART. CAUTION THE CUSTOMER ON THE HAZARDS OF TRYING TO ROLL A CART WITH SMALL CASTERS ACROSS THRESHOLDS OR DEEP PILE CARPETS.

7. CAUTION CUSTOMERS AGAINST THE USE OF A CART OR STAND WHICH HAS NOT BEEN LISTED BY UNDERWRITERS LABORATORIES, INC. FOR USE WITH THEIR SPECIFIC MODEL OF TELEVISION RECEIVER OR GENERICALLY APPROVED FOR USE WITH T.V.’S OF THE SAME OR LARGER SCREEN SIZE.

8. CAUTION CUSTOMERS AGAINST THE USE OF EXTENSION CORDS, EXPLAIN THAT A FOREST OF EXTENSIONS SPROUTING FROM A SINGLE OUTLET CAN LEAD TO DISASTROUS CONSEQUENCES TO HOME AND FAMILY.

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

A.C. VOLTMETER

GOOD EARTH GROUND SUCH AS THE WATER PIPE. CONDUIT. ETC

PLACE THIS PROBE ON EACH EXPOSED METAL PART

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SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD covered by this service data and its supplements and addends, read and follow the SAFETY PRECAUTIONS. NOTE : if unforeseen circumstances create conflict between the following servicing precautions and any of the safety precautions in this publications, always follow the safety precautions.

Remembers Safety First:

General Servicing Precautions

1. Always unplug the DVD AC power cord from the AC power source before: (1) Removing or reinstalling any component, circuit board,

module, or any other assembly.

(2) Disconnection or reconnecting any internal electrical

plug or other electrical connection.

(3) Connecting a test substitute in parallel with an elec-

trolytic capacitor. Caution : A wrong part substitution or incorrect polarity installation of electrolytic capacitors may result in an explosion hazard.

2. Do not spray chemicals on or near this DVD or any of its assemblies.

3. Unless specified otherwise in this service data, clean electrical contacts by applying an appropriate contact cleaning solution to the contacts with a pipe cleaner, cotton-tipped swab, or comparable soft applicator. Unless specified otherwise in this service data, lubrication of contacts is not required.

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

5. Do not apply AC power to this DVD and/or any of its electrical assemblies unless all solid-state device heat sinks are cerrectly installed.

6. Always connect test instrument ground lead to the appropriate ground before connection the test instrument positive lead. Always remove the test instrument ground lead last.

Insulation Checking Procedure

Disconnect the attachment plug from the AC outlet and turn the power on. Connect an insulation resistance meter(500V) to the blades of the attachment plug. The insulation resistance between each blade of the attachment plug and accessible conductive parts (Note 1) should be more than 1Mohm. Note 1 : Accessible Conductive Parts including Metal panels, Input terminals, Earphone jacks, etc.

Electrostatically Sensitive (ES) Devices

Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive (ES) Devices. Examples of typical ES 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 known 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 ES 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 grouned-tip soldering iron to solder or unsolder ES devices.

4. Use only an anti-static solder removal device. Some solder removal devices not classified a “anti-static” can generate electrical charges sufficient to damage ES devices.

5. Do not use freon-propelled chemicals. These can generate electrical charge sufficient to damage ES devices.

6. Do not remove a replacement ES device from its protec tive package until immediately before you are ready to install it. (Most replacement ES devices are packaged with leads electrically shorted together by conductive foam, aluminum foil, or comparable conductive material).

7. Immediately before removing the protective material from the leads of a replacement ES device, touch the protective material to the chassis or circuit assembly into which the device will be installed.

Caution : Be sure no power is applied to the chassis or circuit, and observe all other safety precautions.

8. Minimize bodily motions when handling unpackaged replacement ES devices. (Normally 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 ES device.)

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SPECIFICATIONS

• GENERAL

Power requirements: AC 110-240 V , 50/60 Hz

Power consumption: 8W

Dimensions (Approx.): 430 x 35 x 242 mm (W x H x D) without foot

Weight (Approx.): 1.9 kg

Operating temperature: 5 °C to 35 °C (41 °F to 95 °F)

Operating humidity: 5 % to 90 %

• OUTPUTS

VIDEO OUT: 1 Vp-p 75 Ω, sync negative, RCA jack x 1 / SCART (TO TV)

COMPONENT VIDEO OUT: (Y) 1.0 V (p-p), 75 Ω,negative sync, RCA jack x 1

(Pb)/(Pr) 0.7 V (p-p), 75 Ω, RCA jack x 2

AUDIO OUT: 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 /

SCART (TO TV)

DIGITAL OUT (COAXIAL): 0.5 V (p-p), 75 Ω, RCA jack x 1

• SYSTEM

Laser: Semiconductor laser, wavelength 650 nm

Signal system: PAL / NTSC

Frequency response: DVD (PCM 96 kHz): 8 Hz to 44 kHz

DVD (PCM 48 kHz): 8 Hz to 22 kHz

CD: 8 Hz to 20 kHz

Signal-to-noise ratio: More than 100 dB (ANALOG OUT connectors only)

Harmonic distortion: Less than 0.008%

Dynamic range: More than 95 dB (DVD/CD)

• ACCESSORIES

Remote control (1), Batteries (2)

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2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS .....................................................................................................................2-2

1. Cabinet and Main Frame Section ...........................................................................................2-2

2. Deck Mechanism Section(DPS-02).........................................................................................2-3

3. Packing Accessory Section ....................................................................................................2-4

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2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

BCD

463

300

463

250

I/O,JACK Model

ONLY

A48

A46

463

467

465

320

A44

261

A00

463

A47

452

276

274

452

A50

280

A45

260

261

A43

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2. Deck Mechanism Section(DPS-02)

2-3

431

005

007

432

007

433

A00

033

031

431

034

035

A03

032

110

A01

431

109

021

020

A02

115

113

111

112

114

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2-4

3. Packing Accessory Section

BATTERY

808

PACKING SHEET

804

PACKING

OPTIONAL PARTS

803

806

820

OWNER’S MANUAL

RF CABLE

810

CABLE SET ASS’Y

801

REMOCON

900

BOX CARTON

802

PACKING

803

811

812

PLUG ASS’Y 1WAY(YELLOW)

PLUG ASS’Y 1WAY(BLACK)

PLUG ASS’Y 2WAY

AC ADAPTOR830

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3-1

SECTION 3

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE......................................................................3-2

1. Power check flow.....................................................................................................................3-2

2. System operation flow ............................................................................................................3-3

3. Test & debug flow ....................................................................................................................3-4

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....................3-10

1. SYSTEM 27MHz CLOCK, RESET, FLASH R/W SIGNAL. ....................................................3-10

2. SDRAM CLOCK ......................................................................................................................3-12

3. LOADING CONTROL RELATED SIGNAL .............................................................................3-12

4. SLED CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-13

5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) .............................................3-13

6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION) ............................3-14

7. DISC TYPE JUDGEMENT WAVEFORM ................................................................................3-14

8. FOCUS ON WAVEFORM ........................................................................................................3-16

9. SPINDLE CONTROL WAVEFORM(NO DISC CONDITION ...................................................3-17

10. TRACKING CONTROL RELATED SIGNAL(System checking).........................................3-18

11. MT1389B AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF) ..........................................3-19

12. MT1389B VIDEO OUTPUT WAVEFORM .............................................................................3-19

13. MT1389B AUDIO OUTPUT TO AUDIO DAC .......................................................................3-20

14. AUDIO OUTPUT FROM AUDIO DAC ..................................................................................3-21

15. MEMORY SLOT DATA SIGNAL ...........................................................................................3-21

16. MEMORY SLOT DATA SIGNAL ...........................................................................................3-21

17. MEMORY CLOCK & RESET SIGNAL..................................................................................3-22

BLOCK DIAGRAMS ..................................................................................................................3-23

1. Overall Block Diagram ..........................................................................................................3-23

2. Power(SMPS) Block Diagram ...............................................................................................3-24

3. SERVO Block Diagram ..........................................................................................................3-25

4. MPEG & MEMORY Block Diagram .......................................................................................3-26

5. VIDEO & AUDIO Block Diagram ...........................................................................................3-27

CIRCUIT DIAGRAMS ................................................................................................................3-28

1. Power(SMPS) Circuit DIAGRAM...........................................................................................3-28

2. AV/JACK Circuit DIAGRAM ...................................................................................................3-30

3. SYSTEM Circuit DIAGRAM ...................................................................................................3-32

4. 9 IN 2 MEMORY SLOT Circuit DIAGRAM.............................................................................3-34

5. TIMER Circuit DIAGRAM .......................................................................................................3-36

6. 5.1CH & KARAOKE(KARAOKE MODEL ONLY) Circuit DIAGRAM ...................................3-38

7. SCART Circuit DIAGRAM .....................................................................................................3-40

• CIRCUIT VOLTAGE CHART ....................................................................................................3-42

PRINTED CIRCUIT DIAGRAMS ............................................................................................3-44

1. MAIN P.C.BOARD ...................................................................................................................3-44

2. KEY P.C.BOARD.....................................................................................................................3-46

3. TIMER P.C.BOARD .................................................................................................................3-47

4. SMPS P.C.BOARD ..................................................................................................................3-48

5. MEMORY P.C.BOARD ............................................................................................................3-49

6. 5.1CH P.C.BOARD ..................................................................................................................3-50

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3-2

ELECTRICAL TROUBLESHOOTING GUIDE

1. Power check flow

No 3.3VA

Replace the FR101 (Use the same ICW)

Is the FR101 Normal?

Is the Vcc (about 8.7V) supplied to IC101 Pin2?

Is the D105/ D106/ D107/ D108 Normal?

Replace the D105/ D106/ D107 /D108

Check or Replace the IC101

Replace the D121

Replace the IC103

Replace the D123

Replace the D125

YES

Is the D121 normal?

YES

Is there about 2.5V at the IC103 Pin1?

Is the D123 normal?

Is the D125 Normal?

Power Line of Main

PCB(DVD) is short

No 12V

Check or Replace the D125

Is the Vcc(=14V) supplied to Q123 Collector?

Check or Replace the Q123

Is the Vcc(=12V) supplied to Q126 Base?

Check the ‘PWR CTL “H”’ signal from µ-com

YES

No REG 5.0V

Check or Replace the D123

Is the Vcc(=5.6V) supplied to Q126 Collector?

Check or Replace the Q126

Is the Vcc(=12V) supplied to Q126 Base?

Check the ‘PWR CTL “H”’ signal from µ-com

YES

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3-3

2. System operation flow

YES

Power On

1. 8032 initializes SERVO,DSP & RISC registers

2. Write RISC code to SDRAM

3. Reset RISC

Show LOGO

Exist Disc

Disc loading

SLED at Inner Side ?

SLED Moves to Inner Position

1. Judge whether have disc and disc type

2. Jump to related disc reading procedure

Recieve OPEN/CLOSE Key?

1. Execute Pressed Key & IR Key

2. System operation Routine Loop

1. Stop Playback & Open Tray

2. Display tray open message & LOGO

Receive CLOSE Key?

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3-4

3. Test & debug flow

TEST

Check the AC Voltage

Power PCBA(110V or 220V)

YES

Switch on the Power PCBA

YES

Is the DC Voltage outputs OK?

(5V, 3.3V, 12V,5.6V MOTOR)

YES

Make sure the main PCBA don't short on VCCs and switch it on.

YES

Is 3.3V and 1.8V DC outputs normal on main PCBA?

YES

Connect to PC RS232 Cable and update the FLASH memory code.

YES

Update FLASH successfully?

YES

Replace power PCBA or AC transformer.

Repair or Replace Power PCBA

Check the regulators or related diodes.

1. Check 27MHz system clock.

2. Check system reset circuit.

3. Check FLASH R/W enable signal PRD,RWR.

4. Check RS232 SIGNALS.

5. Check FLASH Memory related circuit.

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3-5

Flash Memory operates properly?

Show LOGO?

Does the disc move inside?

YES YES

YES

Check connection lines between FLASH & MT1389B and the FLASH access time whether is suitable or not.

SDRAM works properly?

Check connection lines between SDRAM & MT1389B and the SDRAM is damaged.

MT1389B VIDEO outputs properly?

Check the related circuit of MT1389B.

Have TV signal output?

Check AV cable connection to TV set.

Sen_load3 & sen_unload3 level<1volt

Check the filtering and amp circuit of TV signal.

Check the sensor of MD

Normal TRCLOSE & TROPEN signal?

Check the Tray control IO pins on MT1389B & IP9005.

Normal LOAD+ & LOADsignal?

Check the cable connection between main PCBA and loader.

Check the Tray control amplifying circuit on Motor driver.

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3-6

Motor Driver STBY Pin is High?

Does the SLED move to inner side when it is at outter position?

Optical Lens has movements for searching Focus?

YES

Check the connection line of STBY signal.

Is FMSO DC Level higher than 1.4V?

Check the related circuit of FMSO.

SL+ and SL- output properly?

YES

Check the amp circuit on motor driver.

Check FOSO connection on MT1389B and motor dirver.

Check the cable connection with MECHA.

Proper FOSO outputs to motor driver?

Proper F+ & F- outputs?

Check the amp circuit on motor dirver.

Check cable connect on with pick-up head.

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3-7

LD01 or LD02 output properly?

Laser turns on when reading disc?

Disc ID is correct?

Does spindle rotate?

YES

Check the laser power circuit on MT1389B and connecting to power transistor.

Collector voltage of power transistor is OK?

Check the related circuit on laser power transistor

Check cable connection between transistor ouput and pick-up head.

YES

Check the related circuit on MT1389B RFL signal.

Check DMSO related circuit on MT1389B.

Check the spindle control amp circuit of motor driver.

Proper RFL signal on MT1389B?

Check LDO1 & LDO2 signal

Proper DMSO signal on MT1389B

SP+ & SP- output properly?

Check the cable connection between spindle and main PCBA.

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3-8

Proper signals on A, B, C, D of MT1389B

Focus ON OK?

Track On OK?

Disc is play ?

YES

Check connections between MT1389B and pick-up head.

Check FEO signal on MT1389B

YES

Check the FOSO connection on MT1389B and motor driver.

Check FOSO signal on MT1389B

YES

Check the TRSO connection on MT1389B and motor dirver.

Check the tracking control amp circuit on motor driver.

Normal TEO Signal on MT1389B?

Check the related

circuit on MT1389B

Properly TRSO signal on MT1389B?

T+ & T- output properly?

Check cable connection on pick-up head.

Check RFO & RFLVL signal waveform.

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3-9

Audio DAC received correct data stream?

Normal Audio output when disc playback?

Normal IR.VFD & Front pannel key functions?

TEST END

YES

Check connection between MT1389B & Audio DAC.

Normal Audio DAC out?

YES

Check the related circuit of Audio DAC.

Check Audio filter, amplify,mute circuit.

Communications between IR.VFD Front pannel key & MT1389B is normally?

Check communication lines on MT1389B.

Check the cable connection on Front pannel.

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3-10

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

1. SYSTEM 27MHz CLOCK,RESET,FLASH R/W SIGNAL.

1) MT1389B main clock is at 27MHz(X501)

FIG 1-1

1.0V, 27MHz

2) MT1389B reset is low active.

FIG 1-2

Reset Time

3.3VA

PWR_CTL

RESET

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3-11

3) RS232 waveform during procedure(Downloading)

FIG 1-3

TXD

RXD

4) Flash R/W enable signal during download(Downloading)

FIG 1-4

PRD

PWR

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3-12

2. SDRAM CLOCK

FIG 2-1

3. LOADING CONTROL RELATED SIGNAL

FIG 3-1

DCLK = 128MHz, Vp-p=2.2, Vmax=2.7V

SEN_UNLOAD3

SEN_LOAD3

CLOSE_SW

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3-13

4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

FIG 4-1

5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION)

FIG 5-1

FOSO(1.5V/1.4V/1.3V)

F+(3.2V/2.7V/2.2V)

F-(3.2V/2.7V/2.2V)

FMSO(1.9V/1.4V/1.1V)

STBY(3.3V)

SL+(4.2V/2.8V/1.2V)

SL-(4.2V/2.8V/1.5V)

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3-14

6. LASER POWER CONTROL RELATED SIGNAL(NO DISC CONDITION)

FIG 7-2 (DVD)

7. DISC TYPE JUDGEMENT WAVEFORM

FIG 7-1

DCLK = 128MHz, Vp-p=2.2, Vmax=2.7V

F+

RFL

MDI1(0V/180mV)

LD01(3.3V//2.3V)

LD02(3.3V/2.3V)

Page 25

3-15

FIG 7-2 (DVD)

FIG 7-3 (CD)

F+

RFL

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3-16

FIG 7-4 (CD)

8. FOCUS ON WAVEFORM

FIG 8-1 (DVD)

FOSO

F+

F-

F+

RFL

Page 27

3-17

FIG 8-2 (CD)

9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION)

FIG 9-1

FOSO

F+

DMSO(1.4V/1.8V)

SP-(3.6V/2.4V)

SP+(3.6V/4.8V)

F-

Page 28

3-18

10. TRACKING CONTROL RELATED SIGNAL(System checking)

FIG 10-1 (DVD)

FIG 10-2 (CD)

TRSO

T+

T-

TRSO

T+

T-

Page 29

3-19

11. MT1389B AUDIO OPTICAL AND COAXIAL OUTPUT (SPDIF)

FIG 11-1

12. MT1389B VIDEO OUTPUT WAVEFORM

1) 100%

FIG 12-1

Page 30

3-20

2) COMPOSITE VIDEO SIGNAL

FIG 12-2

13. MT1389B AUDIO OUTPUT TO AUDIO DAC

FIG 13-1

ASDATA3

Page 31

3-21

15. MEMORY SLOT DATA SIGNAL

FIG 15-1

14. AUDIO OUTPUT FROM AUDIO DAC

FIG 14-1

USBM

USBP

Page 32

3-22

16. MEMORY CLOCK & RESET SIGNAL

FIG 16-1

X1001(12Mhz)

IC1003 (3pin)

RESETn (C1003 1pin)

Page 33

3-23

BLOCK DIAGRAMS

1. Overall Block Diagram

33D VD

IC1001

C503

RS232

CN503

Download

MEMORY SLOT

16BIT

4Bank

SDRAM

CSJ

DMCLK

MA[00:11]

RS232_RXD

BA0

BA1

DQM

IC512

VD33D

IIC/VFD/DAC_SC

USBM/USBP

MD[00:15]

WEJ

CASJ

RAS

KS24C02

_TXD

IIC/VFD/DAC

L/R

DAC_RST

RS232_TXD

IC601

CS4344

EEPROM

VD33D/5V

BCLK

LRCLK

DACC

IC301

2DAC

SER3,DAC_ML0

3V3M

(6DAC)

CS4360

AC_ML1

SER[0:2],D

RF+

MPEG IC

1389

IECDAOUT

RESET

27MHz

CENTER

WOOFER

IC501

MTK MT

+12V

L/R

IC602

OP-AMP

UTC4580

CENTER

IC302~4

IC604

Power

UTC4580

MM1623XFBE

WOOFE

OP-AMP

SPDIF

COAXIAL

B/Pb

R/Pr G/Y

CVBS

VIDEO BUFFE

R/C

RC901

Key

Power

+12V5V

DMUTE

TV_DAC[0:3] YC_MIX

IC505

RESET IC

3.3VA

VD33A

DISC

2/4M

IC502

16/32BIT

FLASH RO

MX29LV160T

DVD : A,B,C,D,RF0

CD : A,B,C,D,E,F,RF0

CDMDI,DVDMDI

PICK

MOTOR

SPINDLE

EF21

CDLD,DVDLD,SVR

ROMDATA[0:7] ROMWR ROMRD 19] ROMAD[0:

CD_DVD, VR_CD,VR_DVD

SLED

(FEEDING)

MOTOR

V18A/V33A

MOTO

OPU_SEL

CD_DVD_CT

Pick-up

SENSOR

M M

DECK MECHANISM

FGN,XSFGP

HOMESW

CLOSE SW

SEN_LOAD UNLOAD3

TRACK[+,-] FOCUS[+,-]

SPINDLE[+,-]

SLED[+,-]

LOAD[+,-]

5V/8V

OPEN,CLOSE,SLEGP,SPINDLE,FOCUS,TRACK,SVRE

IC201

DRVSB

IP9005

CLK CS

Dout

IC901

Din

POWCTL_H

12V

LED DRIVER

3.3V

BOARD

POWER

KEY Input

DIG901

LED Cloc

3.3VA

5V MOTOR

Motor Dri v

50HZ/60H

AC 90V~240V

Page 34

3-24

2. Power(SMPS) Block Diagram

12V

LPF

R(14V)

LPF

R(5.6V)

WITH

T/ W

/ 5.6VA

5.6V(M)

1389D

WITH 1389C

REG.

R(9.5V)

3.4VA

LPF

R(3.4V)

3.2V

PWR CT

RECTIFIE

TRANS

SWIT

CHING IC

RECTIFIE

FEED B.

AC100~240V

FILTERπ

RECTIFIER

Page 35

3-25

3. SERVO Block Diagram

AD[0:7]

X501

27MHz

X-TAL

ROM

FLASH

A[0:20]

IC501

EEP

ROM

SCL, SDA

PRD#, PWR#

PCE#

MT1389C

ONE CHIP

DVDPLAYER

RS232C(MTK)

RXD, TXD

MA[0:11]

DQM0 ,DQM1

WE#,CAS#,RAS#

CS#,BA0,BA1

SDCLK

SDCKE

IC503

SDRAM

DQ[0:15]

4M x 16bit

TRCLOSE

SL+, SL

FOSO,TRSO,FMSO

DMSO,,TROPEN

Motor Driver

STBY,V1P4

LOAD+, LOAD

ADIN

IC201

ALPC

MDI

LD0 1, LDO 2, IOA

V20, PICKSEL

DVD: A,B,C,D, RFO

PICK

CD: A,B,C,D, E, F,RF

SEN_LOAD3, SEN_UNLOAD3

CLOSE_SW

F+, F-, T+, T-

IP9005

SP+, SP-

M/D

Page 36

3-26

4. MPEG & MEMORY Block Diagram

VIDEO

Interface

PROM

IC506

Y2(Y),Y3(Color)

Y4(Y),Y5(Cb),Y6(Cr)

ASPECT(16:9)

SCL,SDA

ACLK,ALRCK,ABCK

MUTE,VSCK,VSDA

AUDIO

Interface

ASTB,SCL,SDA

ASDTA[0:3]

ASPDIF

:7]

AD[0

A[0:20]

IC502

PWR,PCE,PRD

(16 M )

FLASH MEMORY

IC503

SDRAM

M 64

IC508

IC509

A/D Con.

(Karaoke)

OP Am

:15]

CS,DCKE,MA[0:10] DCLK,WE,CAS,RAS

DQ[0 DQM0,DQM1

MT1389

IC501 (MPEG + DSP + RF)

AMDAT

ALRCK ACLK,ABCK

RESET

IC505

RESET IC

X501

27MHz

DOUT DIN

LED DRIVE IC

BOARD

KARAOKE

Page 37

3-27

5. VIDEO & AUDIO Block Diagram

A/V

JACK

CVBS

COMPONENT (R.G.B) / (Y.Pb.Pr )

SUPER VIDEO (Y/C)

AUDIO 'R'

AUDIO 'L'

(OP Amp)

LPF&Buffer

IC602

REAR 'R'

FRONT 'R'

(OP Amp)

LPF&Buffer

IC302

5.1CH BOARD

REAR 'L'

FRONT 'L'

(OP Amp)

LPF&Buffer

IC303

CENTER

WOOFER

(OP Amp)

LPF&Buffer

IC304

Amp

IC604

VIDEO 6dB

(R.G.B) / (Y.Pb.Pr )

MPEG

(Y/C)

IC601

DAC RESET

AUDIO DAC

SCL

ACLK

MPEG

(2CH)

IC301

(5.1CH)

AUDIO DAC

SCL

SDA

ACLK

ADATA3

DAC RESET

SDA

ADATA2

ADATA

ADATA1

MPEG

Page 38

3-28 3-29

CIRCUIT DIAGRAMS

1. POWER(SMPS) CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

WHEN SERVICING THIS CHASSIS, UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE LG ELECTRONICS CORPORATION. ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIR-

CUIT. SPECIAL COMPONENTS ARE SHADED ON THE SCHEMATIC FOR EASY IDENTIFICATION.

THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER FROM THE ACTUAL CIRCUIT USED. THIS WAY, IMPLEMENTATION OF THE LATEST SAFETY AND PERFORMANCE IMPROVEMENT CHANGES INTO THE SET IS NOT DELAYED UNTIL THE NEW SERVICE LITERATURE IS PRINTED.

NOTE :

1. Shaded( ) parts are critical for safety. Replace only with specified part number.

2. Voltages are DC-measured with a digital voltmeter during Play mode.

No Power D105~D108 is Defective

14VA No Power D125 is Defective

5.0V No Power Q126 is Defective

12V No Power Q123 is Defective

Switching Error IC101is Defective

No Power FR101 is Defective

Switching Error IC102,IC103 are Defective

5.6VA No Power D123 is Defective

3.3VA No Power D121 or D122 are Defective

5.6V No Power Q125 is Defective

3.3V No Power Q121 is Defective