LG LX-D2560A, LXS-D2560V, LX-D2960A, LXS-D2960V Service Manual

MINI HOME THEATER

SERVICE MANUAL

MODEL : LX-D2560A(LXS-D2560V)

LX-D2960A(LXS-D2960V)

- 1-1 -

[CONTENTS]

❍ SECTION 1. GENERAL

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

• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

• SPECIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5

❍ SECTION 2. EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2. DECK MECHANISM EXPLODED VIEW (5 CHANGER) . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

3. TAPE DECK MECHANISM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

4. SPEAKER EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

❍ SECTION 3. ELECTRICAL SECTION

• ELECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

• INTERNAL BLOCK DIAGRAM of ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-13

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-25

• BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-27

• SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-29

• PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-41

❍ SECTION 4. DVD PART ELECTRICAL

• DVD ELECTRICAL TROUBLESHOOTIHG GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

• DVD SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-15

• DVD PRINTED CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-23

❍ SECTION 5. MECHANISM OF DVD PART

• DECK MECHANISM DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1

• EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-7

- 1-2 -

SECTION 1. GENERAL

❏ SERVICING PRECAUTIONS

■ NOTES REGARDING HANDLING OF THE PICK-UP

1. Notes for transport and storage

1) The pick-up should always be left in its conductive bag until immediately prior to use.

2) The pick-up should never be subjected to external pressure or impact.

2. Repair notes

1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.

2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board.

3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installation screws should absolutely never be touched.

4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.

5) Cleaning the lens surface If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this.

6) Never attempt to disassemble the pick-up. Spring by excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.

Storage in conductive bag

Drop impact

NEVER look directly at the laser beam, and don’t let contact fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

- 1-3 -

■ NOTES REGARDING COMPACT DISC PLAYER REPAIRS

1. Preparations

1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care.

2) The pick-up is composed of many optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnetism is present, or where there is excessive dust.

2. Notes for repair

1) Before replacing a component part, first disconnect the power supply lead wire from the unit

2) All equipment, measuring instruments and tools must be grounded.

3) The workbench should be covered with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is because there is the possibility of damage by static electricity.)

4) To prevent AC leakage, the metal part of the soldering iron should be grounded.

5) Workers should be grounded by an armband (1M Ω)

6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent static electricity changes in the clothing to escape from the armband.

7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.

CLEARING MALFUNCTION

You can reset your unit to initial status if malfunction occur(button malfunction, display, etc.). Using a pointed good conductor(such as driver), simply short the RESET jump wire on the inside of the volume knob for more than 3 seconds. If you reset your unit, you must reenter all its settings(stations, clock, timer)

NOTE: 1.To operate the RESET jump wire, pull the volume rotary knob and release it.

2. If you wish to operate the RESET jump wire, it is necessary to unplug the power cord.

Resistor (1 Mohm)

Conductive Sheet

Resistor (1 Mohm)

Armband

RESET jump wire

VOLUME

VOLUME KNOB

DOWN

- 1-4 -

❏ 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 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 ESD devices, place the assembly on a conductive sur-

face 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-static" 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 APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DAN- GEROUS 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.

- 1-5 -

❏ SPECIFICATIONS

General

Power supply Refer to the main label. Power consumption

50 W (LX-D2560A model) Net Weight 5.9 kg External dimensions (W x H x D) 190 X 352 X 295 mm

Tuner/Amplifier

FM Tuning Range 87.5 - 108.0 MHz or 65 -74 MHz, 87.5 -108.0 MHz

Intermediate Frequency 10.7 MHz Signal to Noise Ratio 60/55 dB (Mono/Stereo) Frequency Response 50 - 10000 Hz

AM Tuning Range 522 - 1620 kHz or 520 - 1720 kHz

Intermediate Frequency 450 kHz Signal to Noise Ratio 30 dB Frequency Response 140 - 1800 Hz

Output Power Front: 100 W + 100 W (4 Ω, THD 10 %) - LX-D2960A model

Front: 50 W + 50 W (4 Ω, THD 10 %) - LX-D2560A model T.H.D 0.5 % Frequency Response 40 - 20000 Hz Signal-to-noise ratio 75 dB

DVD/VCD/CD player

Frequency response (audio) 40 - 20000 Hz Signal-to-noise ratio (audio) More than 75 dB (1 kHz) Signal-to-noise ratio (video) More than 55 dB (1 kHz) Dynamic range (audio) More than 80 dB Video output 1.0 V (p-p), 75 Ω S-video output (Y) 1.0 V (p-p), 75 Ω

(Pb)/(Pr) 0.7 V (p-p), 75 Ω

Speakers

Speaker Name Front Speaker (L/R) Type Bass Reflex 2Way 3Speaker (LXS-D2960V Model)

Bass Reflex 2Way 2Speaker (LXS-D2560V Model) Impedance 4 Ω Frequency Response 60 - 20000 Hz Sound Pressure Level 85 dB/W (1m) Rated Input Power 100 W (LXS-D2960V) Max. Input Power 200 W (LXS-D2960V) Net Dimensions (W x H x D) 190 X 351 X 295 mm (LXS-D2960V) Net Weight 4.8 kg (LXS-D2960V)

Cassette tape player

Tape Speed 3000 ± 3 % (MTT-111.

NORMAL-SPEED)

Wow Flutter 0.25 %

(TT -111, JIS-WTD) F.F/REW. Time 120 sec (C-60) Frequency Response 250 - 8000 Hz Signal to Noise Ratio 43 dB Channel Separation 50 dB (P/B)/45 dB (R/P) Erase Ratio 55 dB (MTT-5511)

- 1-6 -

SECTION 2. EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION

A26

A51

263

A000

256

255

254

253

251

250

MAC

257

463

262

261

463

A48

259

274

A44

273

276

A46

265

264

A50

A47

300

450

SMPS

MAIN

DVD

FRONT

252

2-1 2-2

NOTE) THE EXCLAMATION POINT WITHIN AN

EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE.

2-3 2-4

2. DECK MECHANISM EXPLODED VIEW (5 CHANGER)

A26

003

075

023

011

038

073

037

032

062

031

004

005

006

007

001

002

071

431

074

072

2-5 2-6

3. TAPE DECK MECHANISM

1011

1013

1009

1003

1002

1007

1037

1006

1018

1017

1019

1020

1021

1022

A001

1023

A000

1025

A002

1015

- 2-7 -

4. SPEAKER EXPLODED VIEW

758

757

A700

756

754

755

753

752

751

750

759

- 2-8 -

- 3-1 -

SECTION 3. ELECTRICAL SECTION

❏ ELECTRICAL TROUBLESHOOTING GUIDE

Check P7904 6PIN P-SENS

Refer to SMPS

Troubleshooting

Check if IC101 KIA7042 input is over 5V.

Check if output voltage of IC101 KIA7042 is 4.3V

Check the related part of IC101 KIA7042

Replace the

related parts

Check power of both terminals of IC101 KIA7042

Check IC100 78KO/KF2 1 PIN power

YES

NO NO

YES

■ MICOM PART CHECK I

- 3-2 -

Check Q102 BASE

PIN 0.6V HIGH

Check Q102 COLLECTOR

Check output power of IC101 KIA7042 is over 4.3V.

Check the related part.

Replace the

related parts

Replace the

related parts

Check the related part.

Check IC103 8PIN IC100 19,20,59 PIN 5V

Check the working condition X101: 32.768kHz X100: 9.8304MHz

Check P7904 5PIN 5.6V

Refer to SMPS Troubleshooting

Check D101 1SR35 output is working on 5V

Check the related part

Replace the

related parts

Check power of both terminals of D101 1SR35

Check Q101 EMITTER 5V and COLLECTOR 5V

YES

■ MICOM PART CHECK II

- 3-3 -

Check IC100 78KOKF2 22,24 PIN

22 PIN DATA 22 PIN CLK Check MICOM power 5V

Refer to MICOM

Troubleshooting

Replace the related parts

Check the related part

Refer to SMPS

Troubleshooting

Check P7302 assembly

Check power of each PIN

Replace the related part

Check P7904 1,2,3 power.

F1+,F2- both terminals: over

3.7V Check power VKK: over 26V.

Check P7302 connection condition and power F1+,F2both terminals: over 3.7V Check power VKK: over 26V Check 25 PIN:5.6V

Check IC301 PT6324 power 50 PIN VKK:-26V

9.52 PIN +5V

YES

■ IC103 KS4CD21CS CHECK

■ FLD DISPLAY CHECK

- 3-4 -

Check IC100 ➞ IC301 DATA communication

PIN PIN

75 PIN

➞ 3PIN STB

76 PIN

➞ 2PIN DO

77 PIN

➞ 4PIN DI

78 PIN

➞ 1PIN CLK

When 5V fails,check D3191SR35 input and output power

Check the related part

Check 76 PIN ➞ DO ➞ DATA input

Check the related part

Replace the related part

FLT light on

IC100 75 PIN ➞ STB 77 PIN

➞ 4PIN DI

78 PIN

➞ 1PIN CLK

Check Data output.

YES

- 3-5 -

Check P7905 9PIN 3.3V

Check if X601 12.288MHz is working.

Check IC604 PS9829 86 PIN CLK input

Check output of IC100 78KOKF2 21

➞ PWM_CLK

➞ PWM_DATA

➞ PWM_REST

Check IC604 PS9829 DATA input 78 PIN

➞ DATA

79 PIN

➞ CLK

96 PIN

➞ REST

Check PWM MODULATOR output FL:75(+)74(-) FR:71(+)70(-) SW:68(+)67(-) CEN:62(+)61(-) SL:59(+)58(-) SR:52(+)51(-)

Check IC604 PS9829 VDD PIN power (3,10,22,29,39,47, 56,65,72,87,94) Check X601 2PIN 3 3V

Refer to SMPS

Troubleshooting

Check the related part of X601

Check R668(470Ω) output

Check resistance output of LINE DATA: R671 CLK: R670 RST: R665

Check DVD ASS`Y PS9829 communication condition (P7403)

Check IC604 PS9829 DATA input

Check IC604 PS9829 part.

Replace the related

part

Replace the related

part

Replace the related

part

Refer to DVD

Troubleshooting

Check resistance

output of each LINE

YES

■ PWM MODULATION PART

- 3-6 -

P7905 3 PIN+12 13,14,15 PIN 32V

Check input power of eachIC700,701,702,703 34,29,26,21 PIN.

Check input power of each IC 700,701,702,703 1,36,17,18,19 PIN +12V

Check PWM MODULATOR input of each IC 4,6,14,16 PIN

Check POWER IC 700,701, 702,703 34,29,27,20 PIN output.

Check output LINE COIL

Refer to SMPS

Troubleshooting

Check resistance power of each LINE IC700:R702,701,726,727,724 IC701:R730,729,750,753,752 IC702:R756,755,768,771,770 IC703:R774,773,794,797,796

Replace the related parts

YES

■ POWER AMP PART CHECK

- 3-7 -

Check if JK800 contacts with

Check IC200 (BU4052) 4, 11PIN input waveform.

Check IC200 (BU4052) 3, 13PIN output waveform.

Check IC801 (MC4580) 2, 6PIN input waveform.

Check IC200 (BU4052) 16PIN VDD, 8PIN VSS power.

Check u-COM (IC301) 83PIN, 84PIN communication.

Refer to SMPS

Troubleshooting.

Replace the related parts

Check IC801 (MC4580)4PIN VSS, 8PIN VDD power.

Replace the related parts.

YES

■ AUX FUNCTION

- 3-8 -

Check TUNER

module(TU601) is working.

Check TUNER MODUEL power(Check 2PIN 9V)

Check IC200(BU4052)

16PIN VDD,8PIN VSS power

Replace the related parts

Check IC200 (BU4052) 16PINVDD,8PIN VSS power.

Replace the related parts

IC200(BU4052) 16PINVDD,8PIN VSS power check

Replace the related parts

Check IC801(MC4580) 4PIN VSS,8PIN VDD power

Check IC200(BU4052) 1, 12PIN input waveform.

Check IC200(BU4052) 3,13PIN output waveform. Check IC601(BU 4502) 2, 15PIN Check 25 PIN:5.6V

Check IC801(MC4580) 2,6PIN input waveform.

TAPE PCB ASS`Y

Check IC801 (MC4580) 2,6PIN input waveform.

Check IC200(BU4052)2,1 5PIN input waveform.

Check IC200 (BU4052) 3,13PIN output waveform. Check IC601 (BU4052) 2,15PIN input waveform.

YES

■ TUNER FUNCTION CHECK

■ TAPE FUNCTION CHECK

- 3-9 -

P2707:4 PIN ➞ 12V

Check IC201 (HA12237)16 PIN 12V input.

Check IC201: 5.26 PIN Signal Output.

Check IC201 14 PIN MUTE is working.

Refer to SMPS

Troubleshooting

Check DECK HEAD input.

Check DECK HEAD input IC201 32.39 PIN.

Replace the HEAD WIRE and Mecha.

Replace the

related parts.

Replace the

related parts.

Check the related part.

Check IC202 10 PIN HIGH is

working.

Check the related part.

YES

■ TAPE PLAY PART CHECK

- 3-10 -

Check IC604 PS9829 #49,#52 PWM output.

Refer to PWM modulation part.

Check Q601 Collector waveform.

Check Board to Board contact.

Check IC203 8 PIN +12V.

Check the related part.

Check Q205(D1304) BASE HIGH.

Check IC202 4 PIN HIGH working.

Refer to SMPS

Troubleshooting

Replace the related parts

Check P7207 #2,#4 output.

Check P2707 #5,#7 input.

Check IC203 MC4580 #1,#7.

Check IC201 10,21 PIN output.

Check L203 2,3 PIN oscillation.

Check .P2203 5,3 PIN input. Check .8 PIN ERASE input.

YES

■ TAPE REC PART CHECK

- 3-11 -

Check the fuse F901

Check the DC V of C905. If DC V is over 400V

Check the DC V Of C981,C945. If DC V is 6.1V

Chcek the DC V Of C950,C951 If DC V is in 35V,-35V

Chcek the DC V Of C909,C903,C921 If DC V is in 14~19V and it is steady.

Replace the fuse

Check BD901,LF901,902

Check IC901,902 Replace IC 901,902

Check short of P9702 line

Check short of P9701 line

Check short of P9701, P9702 line

*MAIN PART

YES

NO NO

■ SMPS POWER CIRCUIT

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