LG DR-4812-W Service manual

CONTENTS

SECTION 1 . . . .SUMMARY

SECTION 2 . . . .CABINET & MAIN CHASSIS

SECTION 3 . . . .ELECTRICAL

SECTION 4 . . . .REPLACEMENT PARTS LIST

1-1

SECTION 1

SUMMARY

CONTENTS

NEW FUNCTIONS OF DVD-RECORDER ........................................................................... 1-2

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS.............. 1-3

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

• General Servicing Precautions

• Insulation Checking Prodedure

• Electrostatically Sensitive Devices

SERVICE INFORMATION FOR EEPROM IC SETTING ................................................. 1-5

SPECIFICATIONS ...................................................................................................................... 1-6

1-2

NEW FUNCTIONS OF DVD-RECORDER

• SUMMARY OF PRODUCT

- RECORDING FUNCTION OF DVD-RW AND DVD-R SPECIFICATIONS

• DVD-RW: VIDEO MODE AND VR MODE RECORD AVAILABLE

• DVD-R :VIDEO MODE RECORD AVAILABLE

- DIGITAL DUBBING FUNCTION OF DV CAMCORDER BY USING DV TERMINAL (IEEE1394)

• RECORD, PLAY, FF/REW FUNCTION BY REMOTE CONTROL OF DV CAMCORDER

- DVD PROGRESSIVE PLAY RESPONSE

- VARIOUS FUNCTION RESPONSE OF DVD RECORDING (DISC NAVIGATION AND CONVENIENT PLAY, EDIT FUNCTION)

- OUTSIDE INPUT AND TV RECORDING AVAILABLE

• RECORDING SCREEN QUALITY :VR(HQ, SQ, LQ), VIDEO(HQ, SQ)

- TV RESERVE RECORDING FUNCTION (AUTO MODE SETTING AVAILABLE FOR RECORDING IN ACCORDANCE WITH THE REMAINING DISC SPACE IN RESERVATION)

SUMMARIZED EXPLANATION OF MAIN FUNCTION

• DVD RECORDING FUNCTION(VR MODE RECORD / VIDEO MODE RECORD)

1) VR MODE RECORD : MANUAL MODE RECORDING IN ACCORDANCE WITH VARIOUS EDITING FUNC-

TION, REMAINING DISC SPACE AND PROGRAM TIME DVD-RW DISC RECORDED IN THE VR MODE CAN BE PLAYED WITH A DVD PLAYER CORRESPONDING TO THE DVD-RW THERE IS ALSO A PLAYER TO BE PLAYED THROUGH FINALIZING. FOR THE DVD-RW, RECORDING AND EDITING IS AVAILABLE AT THE SAME DEVICE EVEN AFTER FINALIZING.

2) VIDEO MODE RECORDING : THERE IS NO EDITING FUNCTION SUCH AS VR MODE RECORDING

BUT VIDEO MODE RECORDING IS PLAYED IN A GAME DEVICE (FOR EXAMPLE, “PLAY STATION 2”) WITH PC, DVD PLAY FUNCTION CORRESPONDING TO DVD PLAYER, CAR DVD, DVD-ROM. TO PLAY IN ANOTHER DEVICE, FINALIZING IS REQUIRED. RECORDING, EDITING AND EDITING IS NOT POSSIBLE AFTER FINALIZING. HOWEVER, RECORDING IS ALLOWED AT THE DVD-RW DISC IF ERASING THE TITLE FINALLY RECORDED AFTER FINALIZING.

3) RECORDING MODE INITIALIZATION (A KIND OF FORMATTING): BEGINS INITIALIZATION AFTER

SELECTING RECORDING MODE AS VR OR VIDEO MODE BY USING INITIALIZATION FUNCTION OF THE DISC SETTING MENU. INITIALIZES DEFAULT AS VR MODE FOR DVD-RW. RECORDS IT AS VIDEO MODE WITHOUT INITIALIZATION FOR VIDEO MODE.

4) FINALIZE: BEGINS FINALIZE AT THE DISC SETTING MENU DURING STOP.

1-3

IMPORTANT SAFETY NOTICE

This manual was prepared for use only by properly trained audio-video service technicians.

When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

Special components are also used to prevent x-radiation, shock and fire hazard. These components are indicated by the letter “x” included in their component designators and are required to maintain safe performance. No deviations are allowed without prior approval by LG Electronics Corporation.

Circuit diagrams 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.

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 property damage or user injury.

Service work should be performed only after you are thoroughly familiar with these safety checks and servicing guidelines.

GRAPHIC SYMBOLS

The exclamation point within an equilateral triangle is intended to alert the service personnel to important safety information in the service literature.

The lightning flash with arrowhead symbol within an equilateral triangle is intended to alert the service personnel to the presence of noninsulated “dangerous voltage” that may be of sufficient magnitude to constitute a risk of electric shock.

The pictorial representation of a fuse and its rating within an equilateral triangle is intended to convey to the service personnel the following fuse replacement caution notice:

CAUTION: FOR CONTINUED PROTECTION AGAINST RISK OF FIRE, REPLACE ALL FUSES WITH THE SAME TYPE AND RATING AS MARKED NEAR EACH FUSE.

SERVICE INFORMATION

While servicing, use an isolation transformer for protection from AC line shock. After the original service problem has been corrected, make a check of the following:

FIRE AND SHOCK HAZARD

1. Be sure that all components are positioned to avoid a possibility of adjacent

component shorts. This is especially important on items trans-ported to and from the repair shop.

2. Verify that all protective devices such as insulators, barriers, covers, shields,

strain reliefs, power supply cords, and other hardware have been reinstalled per the 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 compo-

nents, for frayed leads or damaged insulation (including the AC cord), and replace if necessary.

5. No lead or component should touch a high current device or a resistor rated

at 1 watt or more. Lead tension around protruding metal surfaces must be avoided.

6. After reassembly of the set, always perform an AC leakage test on all

exposed metallic parts of the cabinet (the channel selector knobs, antenna terminals, handle and screws) to be sure that set is safe to operate without danger of electrical shock. DO NOT USE A LINE ISOLATION TRANSFORMER DURING THIS TEST. Use an AC 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 150V AC type capacitor between a known good earth ground water pipe, conduit, etc.) and the exposed metallic parts, one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and .15 mfd capacitor. Reverse the AC plug by using a non-polarized adaptor and repeat AC voltage measurements for each exposed metallic part. Voltage measured must not exceed 0.75 volts RMS. This corresponds to 0.5 milliamp AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.

TIPS ON PROPER INSTALLATION

1. Never install any receiver in a closed-in recess, cubbyhole, or closely fitting shelf space over, or close to, a 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 placement where draperies may obstruct venting. The customer should also avoid the use of decorative scarves or other coverings that 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 tests on customized installations.

5. Caution customers against mounting a product on a sloping shelf or in a tilted position, unless the receiver is properly secured.

6. A product on a roll-about cart should be stable in 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 using extension cords. Explain that a forest of extensions, sprouting from a single outlet, can lead to disastrous consequences to home and family.

A.C. Voltmeter

1500 OHM

10 WATT

Place this probe on each exposed metal part.

Good Earth Ground such as the Water Pipe, Conduit, etc.

0.15uF

PRODUCT SAFETY SERVICING GUIDELINES FOR VIDEO PRODUCTS

1-4

SERVICING PRECAUTIONS

CAUTION : Before servicing the DVD Recorder 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 Recorder 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 Recorder 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 Recorder 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.)

1-5

SERVICE INFORMATION FOR EEPROM IC SETTING

MICOM START

EEPROM ID CHECK

2 BYTE(B3,248,249)

ID OK?

OPTION DATA READ

5TIME & COMPARE

Yes

NAME HEX BINARY OPT1 0C 00000000

00000000 00000000 00000000 (reserved) 00000000 (reserved) 00000000 (reserved)

OPT2 15 OPT3 00 OPT4 00 OPT5 08 OPT6 40 WRITE:OK EXIT:MENU, MP MOVE:< > EDIT : __

OPTION WRITE : OK (OK KEY IN)

MASK : R00 , EEP : R00 , (D10) (Each mask ,eeprom, It shows a development release version.)

DETECT NEW EEPROM (OPTION EDIT SCREEN)

OPTION CONFIRMATION MODE

Press the "CLEAR" key on the Remote controller and the "CH - " key one the Front Panel the same time, then it goes in to Tracking initial mode.

OPTION condition of Present time the CHECK There is a Possibility of doing and the OPTION the REWRITE it is possible.

MICOM NORMAL OPERATION START

Yes

** EEPROM INITIAL ***

- SETUP is displayed in the field if pressing the Front ch- & ch+ Key with the Remocon number "clear" key pressed in the status of powering on.

- AUTO SEARCH is done since the initial screen of ACMS is serviced if powering on.

1-6

SPECIFICATIONS

• GENERAL

Power requirements AC 200-240V, 50/60 Hz Power consumption 44W Dimensions (approx.) 430 X 92 X 382.5 mm (16.9 x 3.6 x 15 inches) (w x h x d) Mass (approx.) 6.4 kg (14.1 lbs) Operating temperature 5˚C to 35˚C (41˚F to 95˚F) Operating humidity 5 % to 90 % Television system PAL B/G colour system Recording format PAL

• RECORDING

Recording format DVD VideoRecording, DVD-VIDEO Recordable discs DVD-ReRecordable, DVD-Recordable Recordable time Approx. 1 hour (HQ mode), 2 hours (SQ mode),

4 hours (LQ mode)

Video recording format

Sampling frequency 27MHz

Compression format MPEG 2

Audio recording format

Sampling frequency 48kHz

Compression format Dolby Digital

• DVD SPECIFICATIONS

Laser system Semiconductor laser Frequency response DVD (PCM 48 kHz): 8 Hz to 22 kHz, CD: 8 Hz to 20 kHz Signal-to-noise ratio More than 100 dB Harmonic distortion Less than 0.008% Dynamic range More than 95 dB

• INPUTS

AERIAL IN Aerial input, 75 ohms VIDEO IN 1.0 Vp-p 75 ohms, sync negative, RCA jack x 2 / SCART AUDIO IN 0 dBm more than 47 kohms, RCA jack (L, R) x 2 / SCART DV IN 4 pin (i.LINK/IEEE 1394 standard)

• OUTPUTS

VIDEO OUT 1 Vp-p 75 Ω, sync negative, RCA jack x 1 S-VIDEO OUT (Y) 1.0 V (p-p), 75 Ω, negative sync, Mini DIN 4-pin x 1

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 output (digital audio) 0.5 V (p-p), 75 Ω, RCA jack x 1 Audio output (optical audio) 5 V (p-p), 75 Ω, Optical connector x 1 Audio output (analog audio) 2.0 Vrms (1 KHz, 0 dB), 600 Ω, RCA jack (L, R) x 1 / SCART

• ACCESSORY:

Video cable ..................................1 Audio cable . . . . . . . . . . . . . . .1

RF Coaxial Cable.........................1 Blank DVD-R disc . . . . . . . . . .2

Remote control ............................1 Batteries . . . . . . . . . . . . . . . . .2

2-1

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

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

2. Deck Mechanism Section(RL-01A) .......................................................................................2-3

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

2-2

EXPLODED VIEWS

1. Cabinet and Main Frame Section

300

A47

463

250

A52

A46

A60

A43

A44

A50

280

452

286

452

286

260

320

465

466

463

466

270

465

467

463

467

265

463

A00

9TOOL ONLY OUTSIDE

A52A

A52B

BCD

2-3

2. DECK MECHANISM SECTION(RL-01A)

001

004

005

431

036

030

025

028

035

034

038

029

033

023

022

031

433

032

025

432

021

037

026

011

019

019A

024

020

A01

A02

A51

A03

042

041

A01A

002

003

012

014

016

015

017

018

435

013

A04

027

2-4

808 Battery

Cable, Coaxial

Plug Ass'y, 1Way

Plug Ass'y, 2Way

Bag

Packing

Remote Control

Instruction Ass'y

Packing

Box

806

804

803

811

812

801

900

802

803

810

CABLE ASS'Y

821

SCART CABLE

3. Packing Accessory Section

3-1

SECTION 3

ELECTRICAL

CONTENTS

VDR PART

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

BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . .3-16

1. LSI OVERALL BLOCK DIAGRAM . . . . . . . . . . . .3-16

2. IN/OUT BLOCK DIAGRAM . . . . . . . . . . . . . . . . .3-18

3. VIDEO IN/OUT BLOCK DIAGRAM . . . . . . . . . . .3-20

4. VIDEO SW PATH BLOCK DIAGRAM . . . . . . . . .3-22

5. AUDIO BLOCK DIAGRAM . . . . . . . . . . . . . . . . . 3-24

6. AUDIO SW PATH BLOCK DIAGRAM . . . . . . . . . 3-26

7. AUDIO IN/OUT BLOCK DIAGRAM . . . . . . . . . . .3-28

8. FLD/µ-COM/TUNER BLOCK DIAGRAM . . . . . . .3-30

9. POWER : MAIN BOARD BLOCK DIAGRAM . . . .3-32

10. POWER : I/O BOARD BLOCK DIAGRAM . . . . .3-34

11. POWER : LAYOUT CONNECTION BLOCK

DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-36

12. SMPS BLOCK DIAGRAM (PART 1) . . . . . . . . . .3-38

13. SMPS BLOCK DIAGRAM (PART 2) . . . . . . . . . .3-40

CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . .3-42

1. POWER CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-42

2. E5 BGA, POWER, UART2 CIRCUIT DIAGRAM .3-44

3. DDR SDRAM, FLASH CIRCUIT DIAGRAM . . . . .3-46

4. RST, CONTROL/STATUS REG, ATAPI, HOST

CPLD, LATCH CIRCUIT DIAGRAM . . . . . . . . . . .3-48

5. 1394, ETHERNET CONNECTOR

CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . .3-50

6. VIDEO IN/OUT CIRCUIT DIAGRAM . . . . . . . . . .3-52

7. AUDIO IN/OUT NON-STD VIDEO

CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . . . . . .3-54

8. I/O MICOM CIRCUIT DIAGRAM . . . . . . . . . . . . .3-56

9. I/O JACK CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-58

10. FRONT CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-60

11. FRONT JACK CIRCUIT DIAGRAM . . . . . . . . . .3-62

• WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-64

• CIRCUIT VOLTAGE CHART . . . . . . . . . . . . . . . . . .3-68

PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . .3-72

1. MAIN P.C.BOARD(TOP SIDE) . . . . . . . . . . . . . .3-72

2. MAIN P.C.BOARD(BOTTOM SIDE) . . . . . . . . . . .3-74

3. I/O P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . . . .3-76

4. JACK P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . .3-76

5. FRONT P.C.BOARD . . . . . . . . . . . . . . . . . . . . . .3-78

6. LED P.C.BOARD (9TOOL ONLY) . . . . . . . . . . . .3-79

7. KEY P.C.BOARD . . . . . . . . . . . . . . . . . . . . . . . . .3-78

8. POWER P.C.BOARD . . . . . . . . . . . . . . . . . . . . . .3-79

RL-01A LOADER PART

ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . .3-80

BLOCK DIAGRAMS & DESCRIPTION . . . . . . . . . . . .3-94

1. OVERALL BLOCK DIAGRAM . . . . . . . . . . . . . . .3-94

2. MAJOR IC INTERNAL BLOCK DIAGRAM AND

PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . .3-95

3. MAJOR IC INTERNAL BLOCK DIAGRAM AND

PIN DESCRIPTION . . . . . . . . . . . . . . . . . . . . . .3-100

4. IC302(UPD76F0047):MICOM . . . . . . . . . . . . . .3-109

WAVEFORMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-113

1. POWER & RESET SIGNAL . . . . . . . . . . . . . . . .3-113

2. MAIN CLOCK1 FOR IC202 (16.9MHZ) . . . . . . .3-113

3. MAIN CLOCK2 FOR IC302 (20MHZ) . . . . . . . . .3-114

4. SDRAM CLOCK . . . . . . . . . . . . . . . . . . . . . . . .3-114

5. TRAY OPEN/CLOSE SIGNAL 1 . . . . . . . . . . . . .3-115

6. TRAY OPEN/CLOSE SIGNAL 2 . . . . . . . . . . . . .3-115

7. SLED MOVE SIGNAL 1 . . . . . . . . . . . . . . . . . . .3-116

8. SLED MOVE SIGNAL 2 . . . . . . . . . . . . . . . . . . .3-116

9. FOCUS SEARCH SIGNAL . . . . . . . . . . . . . . . .3-117

10. LASER TURN ON SIGNAL . . . . . . . . . . . . . . .3-117

11. DISC TYPE JUDGEMENT WAVEFORM

(CD SERIES) . . . . . . . . . . . . . . . . . . . . . . . . . .3-118

12. DISC TYPE JUDGEMENT WAVEFORM

(CD&CD-R) . . . . . . . . . . . . . . . . . . . . . . . . . . .3-118

13. DISC TYPE JUDGEMENT WAVEFORM

(CD-RW) . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-119

14. DISC TYPE JUDGEMENT WAVEFORM

(DVD SERIES) . . . . . . . . . . . . . . . . . . . . . . . .3-119

15. DISC TYPE JUDGEMENT WAVEFORM

(DVD_SINGLE&R) . . . . . . . . . . . . . . . . . . . . .3-120

16. DISC TYPE JUDGEMENT WAVEFORM

(DVD _DUAL) . . . . . . . . . . . . . . . . . . . . . . . . .3-120

17. DISC TYPE JUDGEMENT WAVEFORM

(DVDRW) . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-121

18. SPINDLE WAVEFORM1 . . . . . . . . . . . . . . . . .3-121

19. SPINDLE WAVEFORM2 . . . . . . . . . . . . . . . . .3-122

20. FOCUS ON SIGNAL(CD) . . . . . . . . . . . . . . . .3-122

21. FOCUS ON SIGNAL(CD) . . . . . . . . . . . . . . . .3-123

22. FOCUS ON SIGNAL(DVD) . . . . . . . . . . . . . . .3-123

23. FOCUS ON SIGNAL (DVD) . . . . . . . . . . . . . . .3-124

24. TRACK OFF SIGNAL(CD) . . . . . . . . . . . . . . . .3-124

25. TRACK OFF SIGNAL(DVD) . . . . . . . . . . . . . . .3-125

26. TILT DRIVER SIGNAL(DISC READING) . . . . .3-125

27. RF WAVEFORM(DVD) . . . . . . . . . . . . . . . . . .3-126

28. RF WAVEFORM(CD) . . . . . . . . . . . . . . . . . . . .3-126

29. WOBBLE(DVD-R/RW)_READING . . . . . . . . . .3-127

30. WOBBLE(DVD+R/RW)_READING&WRITING

=>X1 SPEED . . . . . . . . . . . . . . . . . . . . . . . . .3-127

31. LD ENABLE(DVD) . . . . . . . . . . . . . . . . . . . . . .3-128

32. LD ENABLE(CD) . . . . . . . . . . . . . . . . . . . . . . .3-128

33. LASER POWER(READING)_DVD+RW . . . . . .3-129

34. LASER POWER(ERASE)_DVD+RW . . . . . . . .3-129

35. LASER POWER(WRITING)_INITIAL STATE . .3-130

36. LASER POWER(WRITING)_PROCESSING . .3-130

CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . .3-131

1. RF CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . . .3-131

2. DSP CIRCUIT DIAGRAM . . . . . . . . . . . . . . . . .3-133

3. µ-COM CIRCUIT DIAGRAM . . . . . . . . . . . . . . .3-135

PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . .3-137

1. MAIN P.C.BOARD(TOP SIDE) . . . . . . . . . . . . . .3-137

3-2

ELECTRICAL TROUBLESHOOTING GUIDE

VDR PART

No 5VD

No 5.2VA

Is 5.2VA section working?

Is 5.2V present at emitter of Q120?

Replace Q120

Replace TH01

Replace BD101

No VF+

Is 5.2VA section working?

Replace R102

Check R102

YES

Check F101

YES

Is there a DC voltage at TH01?

YES

Is there a DC voltage At (+) terminal of BD101?

Replace IC101

YES

(Power ( SMPS ) Circuit (Part 1))

Power Section

3-3

No 3.3V

No 3.8VA

Is 3.8VA section working?

Is there a DC voltage at IC154 1PIN

Check IC154

Replace IC154

No 1.8V

Is 3.8VA section working?

Check IC160

Replace IC160

Is there a DC voltage at IC160 1PIN

YES

Is there a DC voltage

D122(-)?

YES

Replace IC104

Check Polarity D122

Replace IC104

YES

(Power ( SMPS ) Circuit (Part 2))

3-4

IC2075 - 8 : HIGH?

( /E5_RST )

Check IC2075 power and other circuits

X102 : Clock oscillated ?

( 13.5 MHz )

Replace X102

RESET

IC1057 - 26 : Check signal?

(E5_CS0 )

Check IC2085 signal flow

Check DRIVE power?

5V, 12V

Check SMPS

Check ATAPI Interface connector H203

LG logo not displayed at POWER ON

YES

SYSTEM Section

DISC not recognized

Check IC1057 power and other circuits

3-5

When playing DISC, no audio output

IC802 – 24,25,26,27 Check audio output

Check IC802 power and other circuits

IC802 - 14 : HIGH ?

(AD/DAC RESET status)

Check IC2033 power and other circuits

IC802 - 11,12 : I2C signal normal?

Check R1A1, R118, R119, R121

Check IC802 power and other circuits

IC702 - 46: HIGH ?

( LOW: AUDIO MUTE )

Check IC702 power and other circuits

No OPTICAL / DIGITAL output

PN6701 - 2 signal normal?

Check TR701, JK704

power and other circuits

Check R120, FFC CABLE signal flow

Check IC711 power and other circuits

YES

NO NO

3-6

No TUNER audio output

IC808,809 - 7

Check audio signal output

Check IC808,809 (AUDIO SWITCH) power and Switching operation Pin 2,4 High/Low =>Pin 7 output : SW_A_OUT_L/R

IC7808,809-5

Check audio signal input

Audio output even when

playing DISC

< When playing DISC, no audio output. > Check

IC804 - 23,27

Check audio signal output

Check IC808,809 signal flow and power

IC804 - 32,33

Check I2C signal flow

Q803 2(Emitter ) Hihg?

IC804 – 9:LOW?

HIGH: AUDIO MUTE

IC804 - 32,33

Check signal flow

IC702 - 46

LOW:AUDIO MUTE

IC804 – 20,24

Check audio signal input

Check R913,R914,C876,C877 signal flow

IC 807 - 30,31 :

No audio signal output

Check IC807 power and other circuits Check X801 oscillated

YES

3-7

No TUNER VIDEO signal input

IC702 - 39 :

No Sync signal input

Check IC705 power and other circuits

When

changing a channel, IC702 -

69 :HIGH after RESET signal?

Check TUNER power and other circuits

Check IC702 power and other circuits

IC807 - 2 : Check SIF

signal input\

Check C866, TUNER signal fl ow

Check Q702 ( V.Buffer TR) circuit

YES

3-8

No external input 1 audio

IC808,809 - 7

Check audio signal output

IC808,809 (AUDIO SWITCH) Check power and switching operation Pin 2,4 High/Low =>Pin 7 output : SW_A_OUT_L/R

IC7808,809-5

Check audio signal input

Audio output

even when playing DISC

< When playing DISC, no audi o ou tput > Check

IC804 - 23,27

Check audio signal output

Check IC808,809 signal flow and power

IC804 - 32,33

Check I2C signal flow

Q803 2(Emitter ) Hihg?

IC804 – 9:LOW? HIGH: AUDIO MUTE

IC804 - 32,33

Check signal flow

IC702 - 46

LOW:AUDIO MUTE

IC804 - 10,16

Check audio signal input

JK803 – 2 ,6 Check input

END

YES

3-9

No external input 2 audio

IC808,809 - 7

Check audio signal output

IC808,809 (AUDIO SWITCH) Check power and switching operation Pin 2,4 High/Low =>Pin 7 output : SW_A_OUT_L/R

IC7808,809-5

Check audio signal input

Audio output

even when playing DISC

< No audio output when playing DISC > Check

IC804 - 23,27

Check audio signal output

Check IC808,809 signal flow and power

IC804 - 32,33

Check I2C signal flow

Q803 2(Emitter ) Hihg?

IC804 – 9:LOW? HIGH: AUDIO MUTE

IC804 - 32,33

Check signal flow

IC702 - 46

LOW:AUDIO MUTE

IC804 – 8,14

Check audio signal input

JK803 – 23,27 Check input

END

YES

YES YES

YES

NO NO

YES

3-10

No external input 3 audio

END

IC808,809 - 7

Check audio signal output

IC808,809 (AUDIO SWITCH) Check power and switching operation Pin 2,4 High =>Pin 7 output : A1_L/R Pin 2,4 High/Low =>Pin 7 output : TU_L/R

IC7808,809-5

Check audio signal input

Audio

output even when playing DISC

< No audio output when playing DISC > Check

Check JK801 Audio L/R terminal

YES

3-11

No external input 4 audio

END

IC808,809 - 7

Check audio signal output

IC808,809 (AUDIO SWITCH) Check power and switching operation Pin 2,4 Low =>Pin 7 output : A2_L/R Pin 2,4 High/Low =>Pin 7 output : TU_L/R

IC7808,809-1

Check audio signal input

Audio

output even when playing DISC

< No audio output when playing DISC > Check

Check PN802 FFC Cable 1,3

Check JK 762,763 terminal

END

YES

3-12

No RGB / Component video signal when playing DISC

SW801 Q High?

IC7042 - 49 : HIGH ?

Check other circuits around IC702

Q808 Collector High?

signal after checking R951,952, 953,956 and FFC CABLE?

IC4003 - 8 : HIGH ?

/RST_VIDEO

IC4003-4

Check Clock signal input

IC4003- 9~16

Check VO_D0-~VO_D7 signal

IC1099 => IC4003

Check VO_D0 ~ VO_D7 signal

IC2075-8

Check signal

Check R112 CLOCK

Check IC4009-31,32 signal

and 5V power

Check IC4002 power and other circuits

Check IC702 ñ 85 :High input

IC806 ñ 16,18,20

R,G,B output?

IC806power and other circuits

IC806 – 16,18,21 Pr,Pb,Y output?

IC4003 –41,42

Check I2C CLK, DATA

YES

YES YES

YES

YES YES

YES

3-13

No COMPOSIT / S-VIDEO signal when playing DISC

S-VIDEO: No Y signal?

Check R956,896

No COMPOSIT signal?

S-VIDEO : No C signal?

IC806 - 3

Check output

Check R954,C896

IC4003 - 8 : HIGH ?

/RST_VIDEO

Check IC4003-4

Clock signal input

IC4003 ñ41,42

Check I2C CLK, DATA

IC4003- 9~16

Check VO_D0-~VO_D7 signal

IC1099 => IC4003

Check VO_D0 ~ VO_D7 signal

IC2075-8

Check signal

Check R112 CLOCK

Check IC4009-31,32

signal and 5V power

Check IC4002 power and other circuits

Check R810,C927

IC804 – 29,30 Check output

Check R804,C892

IC806 - 21

Check output

Check R918,C925

IC806 - 26

Check output

Check R821,C821

YES

3-14

No TV , external input video si gnal

No video signal of external input 1/ 2

( Rear Com osite i nput )

When connecting Tuner, no TV video signal

No video signal of external input 3/4 ( Front S-VIEDO / Comosite input )

Check IC804 - 28(input) and 31 (output), and thenCABLE => IC4009 signal input

IC4009 - 27 : HIGH ?

/RST_VIDEO

When RESET,

check IC4009 - 31,32

I2C CLK, DATA

Check IC4009 – 91,94 signal?

( VI_CLK, VI_VSYNC0 )

Check IC2075- 8,9 signal

Check IC4003- 40,41 signal and 5V LEVEL

Check X401 Clock oscillated

IC4009 => IC1099

Check VI_D0 ~ VI_D7 signal

Check IC4009 power and other circuits

< When playing DISC, no COMPONENT, COMPOSIT/S-VIDEO signal > Check

Replace X401 X-TAL

Check Tuner power and other circuits

JACK CABLE => IC4009

Check signal input

Check IC804 - 1,3(input) and 31 (output), and then CABLE => IC4009 signal input

YES

NO NO

YES

3-15

No DV( IEEE 1394 ) input (video/audio) signal

Check DV_JACK and CABLE connection

IC3048 - 42,43,44,45

Check signal input

IC3048 - 78:HIGH?

( /RST_PHY )

Check IC2075 –8 signal

Check IC3048 - 2 Clock?

BIO_PHY_CLK

Check X301 Clock

24.576 MHz

IC3048 => IC1099

Check BIO_PHY_DATA/CLK

signal

Check IC3048 power and other circuits

< When playing DISC, No COMPONENT, COMPOSIT/S-VIDEO signal > Check

YES

3-16 3-17

BLOCK DIAGRAMS

1. LSI Overall Block Diagram

Front U-com

V_DEC

Decoder

SAA7115

A_ADC

CS4271

S1 / S2

A1_In

Tuner

S/PDIF

DMN8600

V_ENC

SAA7128

A_ADC:2ch

CS4271

V2_In

S_In

A2_In

I/O Bíd

Front Jack Bíd

AI_D0

V1_IN

CVBS_Out

I/O Bíd

S_VIDEO_Out Y/Pb/Pr or R/G/B

Analog Audio Out

Optical & Digital Audio Out

BIO_PHY_DATA[0:7]

PHY

TSB41LV03A

DV_In

HD[0:15]

UART1

UART2 / GPIO

JTAG

A0_D 0

A0_IEC958

V0_D[0:15]

ATAPI_DATA[0:15]

ATAPI_...

DVD-RW DRIVE

DDR SDRAM

8M WordX4

I/O Bíd

U-COM

HOST_RXD HOST_TXD (156.25KHz)

MAIN Bíd

Latch

74LVT16373

BA[6:21]

Flash

4MByte

V1_In

N/A2

MSP3417

BA[1:5],BA22

3-18 3-19

2. In/Out Block Diagram

TUNER

CVBS

G (Y)

B (Pb) R (Pr)

G(Y) OUT

B(Pb) O UT

R(Pb) O UT

G_SCART_OUT

B_SCART_OUT

R_SCART_OUT

R SCART I N

B SCART IN G SCART IN

SCART 1

MM1225

V_SWITCH

MM1225

V_SWITCH

MM1225

V_SWITCH

SDA5650

VPS

MM1510

6dB Buffer

SW_V_OUT

Y OUT

C OUT

CVBS OUT

MM1109

Sync

Seperator

SW801

G_SCART_OUT

R_SCART_OUT

B_SCART_OUT

I2C

DAV

C_SYNC_IN

MSP3417

AUDIO

Processor

TU _A_L/R

NJM2521

AUDIO

SWICH

A1 L/R IN

AI_DO

AO_DO

DAC_MCLK AO_FSYNC

AO_SCLK

A_OUT_L/R

Audio Out

AUDIO OUT L

CVBS OUT

AUDIO OUT R

74HCT04

INVERTER

AO_IEC958

OPTICA

COAXIAL

TU A OUT

HIGH :From S CART2 LO W:From SW801

HIGH:G/B/R LOW:Y/Pb/Pr

SW_A_OUT` L/R

I/O U-COM

0dB

Buffer

EU2_A_IN_L/R

EU1_V_IN

EU1_A_IN_L/R

FRONT JACK

I/O JACK

A2 L/R IN

V2 IN

Y/C IN

TU_V_OUT

Audio_Sel_1

Audio_Sel_2

Audio_Out

HLLL

A1 SW A2

AUDIO SEL 1,2

CS4271

AUDIO

CODEC

DMM8600

MPEG

ENC/DEC

SCART 2

EU2_V_IN

MM1443

AV SWITCH Built in 6dB

SAA7115

Video

Decoder

(ADC)

MM1623

VIDEO

Buffer

FRONT JACK

MAIN BOARD

I/O BOARD

V1 IN

I2C

SAA7128

Video

Encoder

(DAC)

VI-D0/D7

V0_D0/D7

3-20 3-21

3. Video In/Out Block Diagram

IC4009

SAA7115

VIDEO

Decoder

VI_D[0:7]

TU_Vz_IN

Y_IN

C_IN

V1_IN

V2_IN

VI_CLK

VI_VSYNCO

IC4003

SAA7128

VIDEO

Encoder

VO_D[0:7]

CVBS

SCL/SDA

24.576MHz

VO_CLK

IC1099

DMN8600

/RST_VIDEO

R / Pr

G / Y

B / Pb

3-22 3-23

4. Video SW Path Block Diagram

S2 S1 AV3

IC805

MM1510

(6dB,75 )

IC811

SDA5650

(VPS)

IC706

MM1510

(6dB,75 )

IC702

(u-COM)

IC705

MM1109

(Sync SEP.)

IC806

MM1623

(6dB A.)

AV4/S-V

V.DEC

V.ENC

TU_V_OUT

SW_V_OUT(TU/E1/E2)

CVBS_OUT

V1_IN

PB_IN

SW1

SW3

SW2

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