LG J-10-HD, J-10-HDD Service manual

2.1CH HOME THEATER SYSTEM

SERVICE MANUAL

Website http://biz.lgservice.com

Internal Use Only

SEPTEMBER, 2007

MODELS: J10HD-D/J10HD (J10HD-SF/J10HD-SA)

SERVICE MANUAL

MODELS: J10HD-D/J10HD

P/NO : AFN32759823

SPEAKERS: J10HD-SF/J10HD-SA

CAUTION

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

CONTENTS

SECTION 1.........SUMMARY

SECTION 2.........ELECTRICAL

SECTION 3.........CABINET & MAIN CHASSIS

SECTION 4.........REPLACEMENT PARTS LIST

LGE Internal Use Only

1-2

SECTION 1

SUMMARY

CONTENTS

PRODUCT SAFETY SERVICING GUIDELINES FOR HOME THEATER SYSTEM PRODUCTS

........1-3

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

• GENERAL SERVICING PRECAUTIONS

• INSULATION CHECKING PRODEDURE

• ELECTROSTATICALLY SENSITIVE (ES) DEVICES

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

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

Only for training and service purposes

LGE Internal Use Only

1-3

PRODUCT SAFETY SERVICING GUIDELINES FOR

HOME THEATER SYSTEM PRODUCTS

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 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 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 com-

ponent 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 splash-

es, 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 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.

LGE Internal Use Only

1-4

SERVICING PRECAUTIONS

CAUTION: Before servicing the HOME THEATER SYSTEM 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. Remember Safety First :

General Servicing Precautions

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

module, or any other assembly.

(2) Disconnecting 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 HOME THEATER SYSTEM 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 HOME THEATER SYSTEM and / or any of its electrical assemblies unless all solidstate device heat sinks are correctly installed.

6.Always connect the test instrument ground lead to an appropriate ground before connecting 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 include 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 grounded-tip soldering iron to solder or unsolder ES 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 ES devices.

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

6.Do not remove a replacement ES device from its protective 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.)

Only for training and service purposes

LGE Internal Use Only

1-5

SERVICE INFORMATION FOR EEPROM

1. Press the CLEAR button on the remote control together with STOP button on the front panel about 6 sec.

The picture on OSD will be as bellow :

* Refer to page 4-1

2. To MOVE from OP1 (Option 1) to another option, press button on the remote control.

3. To CHANGE the option code, press button on the remote control.

4. To APPLY the option code, after change the option press ENTER button on remote control.

5. OSD “Write OK”.

6. To INITIALIZE the system, press CLEAR button on the remote control together with STOP button on the front panel about 6 sec.

7. To exit from the option code menu without initialize the system, just turn off the power and then turn on again.

OP1 : 00 00000000 MASK : 30 OP2 : 00 00000000 E : FF (OR) OP3 : 00 00000000 D39 OP4 : 00 00000000 OP5 : 00 00000000 OP6 : 00 00000000 OP7 : 00 00000000 OP8 : 00 00000000 E X I T : OP9 : 00 00000000 MOVE : < > OPA : 00 00000000 EDIT

LGE Internal Use Only

1-6

SPECIFICATIONS

• GENERAL

Dimensions (approx.) 326 X 215 X 78mm (w x h x d) without foot Mass (approx.) 3.1kg Operating temperature 5°C to 35°C Operating humidity 5% to 90%

Audio recording format

Sampling frequency 44.1kHz Compression format MP3 Sampling bitrate 128Kbps

• RECORDING

Recordable media HDD (80GB)

• PLAYBACK

Frequency response DVD (PCM 48kHz) : 20Hz to 20kHz, CD : 20Hz to 20kHz

DVD (PCM 96kHz) : 20Hz to 44kHz Signal-to-noise ratio More than 85dB (SPEAKER OUT) Harmonic distortion Less than 0.007% (SPEAKER OUT) Dynamic range More than 85dB (SPEAKER OUT)

• INPUTS

Audio input (optical audio) 3V (p-p), 75Ω, Optical connector x 1 VIDEO IN 1.0Vp-p 75ohms, sync negative, SCART x 1 AUDIO IN 0dBm more than 47kohms, RCA jack (L, R) x 1 / SCART x 1

• OUTPUTS

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

(Pb) / (Pr) 0.7V (p-p), 75Ω, RCA jack x 2 HDMI video / audio output 19pin (HDMI standard, Type A)

• AMPLIFIER

Output power Front : 75W + 75W (4Ω at 1kHz, THD 10%)

Subwoofer : 150W (3Ω at 60Hz, THD 10%)

• TUNER SPECIFICATIONS

Tuning Range (FM) 87.5 - 108MHz Intermediate Frequency (FM) 10.7MHz Signal-to-noise ratio 60dB(Mono) Tuning Range (AM) 522 - 1,611kHz Intermediate Frequency (AM) 450kHz Antenna Wire antenna (FM)

Loop antenna (AM)

• SPEAKERS Front (J10HD-SF) Active Subwoofer (J10HD-SA)

Type : 2 Way 3 Speaker Power requirements : AC 200 - 240V, 50/60Hz Impedance : 4Ω Power consumption : 75W Frequency Response : 100 - 20,000Hz Type : 1 Way 1 Speaker Sound Pressure Level : 82dB/W (1m) Impedance : 3Ω Max. Input Power : 150W Frequency Response : 65 - 1,500Hz Net Dimensions (WxHxD) : 104 x 328 x 21mm Sound Pressure Level : 80dB/W (1m) Net Weight : 2.9kg Max. Input Power : 300W

Net Dimensions (WxHxD) : 216x 328 x 317mm Net Weight : 8.3kg

Only for training and service purposes

LGE Internal Use Only

2-1

SECTION 2

ELECTRICAL

CONTENTS

ELECTRICAL TROUBLESHOOTING GUIDE

.....2-2

1. SMPS TROUBLESHOOTING FLOW ............2-2

2. DC/DC TROUBLESHOOTING FLOW ...........2-5

3. AMP PROTECTION .......................................2-8

WAVEFORMS

.....................................................2-9

1. WHEN POWER ON, RESET (DVD & µ-COM)

WAVEFORM ..................................................2-9

2. AT USB FUNCTION, DP, DM WAVEFORM...2-9

3. STARTING ACTION WAVEFORM IN

MD DEVICE .................................................2-10

4. AT DVD FUNCTION.....................................2-10

5. AT POWER ON, SPINDLE SIGNAL

AT MD DECK................................................2-11

6. TRACKING SIGNAL.....................................2-11

7. DISK TYPE JUGEMENT WAVEFORM........2-12

WIRING DIAGRAMS.....................................2-13

1.

ACTIVE SUBWOOFER WIRING DIAGRAM

......2-13

2. MAIN SYSTEM WIRING DIAGRAM ............2-15

BLOCK DIAGRAMS .....................................2-17

1.

ACTIVE SUBWOOFER BLOCK DIAGRAM

.......2-17

2. MAIN SYSTEM BLOCK DIAGRAM .............2-19

3. DC/DC SMPS BLOCK DIAGRAM ...............2-21

4.

DC/DC CONVERTER BLOCK DIAGRAM

......2-23

CIRCUIT DIAGRAMS ...................................2-25

1. SMPS (POWER) CIRCUIT DIAGRAM ........2-25

2. SMPS (DC/DC CONVERTER)

CIRCUIT DIAGRAM .....................................2-27

3. AMP & PWM CIRCUIT DIAGRAM...............2-29

4. I/O & POWER CIRCUIT DIAGRAM.............2-31

5. XM READY CIRCUIT DIAGRAM.................2-33

6. µ-COM (MAIN) CIRCUIT DIAGRAM............2-35

7. RF, DRIVE & OPU CIRCUIT DIAGRAM ......2-37

8. MPEG CIRCUIT DIAGRAM .........................2-39

9. DSP (MS3900) CIRCUIT DIAGRAM...........2-41

10. HDMI CIRCUIT DIAGRAM..........................2-43

11.

POWER INTERFACE CIRCUIT DIAGRAM

.......2-45

12. USB (UBI9032) CIRCUIT DIAGRAM..........2-47

13. T-SLIDE CIRCUIT DIAGRAM .....................2-49

14. LOGO & RCU CIRCUIT DIAGRAM ............2-50

15. KEY CIRCUIT DIAGRAM............................2-51

16. EJECT CIRCUIT DIAGRAM .......................2-52

17.

HEADPHONE & USB CIRCUIT DIAGRAM

...2-53

18. RCU CIRCUIT DIAGRAM ...........................2-54

19. TOUCH PAD CIRCUIT DIAGRAM ..............2-55

• CIRCUIT VOLTAGE CHART ...................2-57

PRINTED CIRCUIT DIAGRAMS...............2-59

1. DVD MAIN P.C.BOARD ..............................2-59

2. MAIN SMPS P.C.BOARD ............................2-63

3. DC/DC CONVERTER P.C.BOARD .............2-64

4. MAIN AMP P.C.BOARD...............................2-65

5. TOUCH PAD P.C.BOARD ...........................2-69

6. TOUCH SLIDE P.C.BOARD ........................2-71

7. I/O P.C.BOARD ...........................................2-71

8. HDD TO MAIN ATAPI P.C.BOARD..............2-73

9. USB & PHONE P.C.BOARD .......................2-73

10. EJECT P.C.BOARD.....................................2-74

11. LOGO P.C.BOARD ......................................2-73

12. KEY P.C.BOARD.........................................2-74

13. LED 1 P.C.BOARD ......................................2-75

14. LED 2 P.C.BOARD ......................................2-75

15. RCU P.C.BOARD ........................................2-76

LGE Internal Use Only

2-2

ELECTRICAL TROUBLESHOOTING GUIDE

1. SMPS TROUBLESHOOTING FLOW

No 5.6VA

YES

Is the F901 normal? Replace the F901 (Use the same fuse)

YES

NO

Is the BD901 normal? Replace the BD901

YES

NO

Is the TH902 normal? Replace the TH902

YES

NO

Is the Vcc (16V - 25V)

supplied to C923?

Is the D907 normal?

YES

NO

Is there about 2.5V at the

IC942 pin1?

Replace the IC942

NO

Check or Replace the D907

Is the D944 normal? Replace the D944

YES

NO

YES

Is the D948 normal? Replace the D948

YES

NO

Is the D946 normal? Replace the D946

YES

NO

Is the D940 normal? Replace the D940

YES

NO

Is the D942 normal? Replace the D942

YES

NO

Power line of main PCB is short

Only for training and service purposes

LGE Internal Use Only

2-3

No 14VA

Is the Vcc(18V~25V)

supplied to C923?

Check or replace the D907

YES

NO

Is the D940, D942

normal?

Replace the D940, D942

YES

NO

Power line of DC/DC PCB is short

No 12V

Is there about 13.5V at

the IC947 pin1?

Check or replace the D946

YES

NO

Is there about 3.3V~ 5V

at the IC947 pin4?

Check the PWR_CTRL ‘H’

signal from µ-com

YES

NO

Check the IC947 and replace

No 3.5V

Is there about 4V at

the IC955 pin1?

Check or replace the D948

YES

NO

Is there about 3.3V~ 5V

at the IC947 pin4?

Check the PWR_CTRL ‘H’

signal from µ-COM

YES

NO

Check the IC955 and replace

LGE Internal Use Only

2-4

No 32VA

Replace the F901

(Use the same fuse)

YES

NO

Is the F901 normal?

Replace the BD901

YES

NO

Is the BD901 normal?

Replace the TH902

YES

NO

Is the TH902 normal?

Replace the D941

YES

NO

Are the D941 normal?

Replace the IC949

YES

NO

Is there about 2.5V

at the IC949?

Is the Q904 Normal?

Check or Replace the Q904

YES

NO

Is Vcc (18V - 25V) supplied to C903?

Power line of AMP PCB is short

Only for training and service purposes

LGE Internal Use Only

2-5

No 3.3V

Is there about 14V at

the IC201 pin2?

Check or replace the SMPS 14VA line

YES

NO

Is there about 3.3V at

the C241,C203?

Check the PWR_ CTRL ‘H’

signal from µ-com

YES

NO

Check the IC201 and replace

No 12V

Is there about 13.5V at

the IC260 pin1?

Check or replace the SMPS 14VA line

YES

NO

Is there about 12V at

the IC260 pin2?

Check the PWR_CTRL ‘H’

signal from µ-com

YES

NO

Check the IC260 and replace

No 5.1V

Is there about 14V at

the IC202 pin2?

Check or replace the SMPS 14VA line

YES

NO

Is there about 5V at the

C208?

Check the PWR_CTRL ‘H’

signal from µ-COM

YES

NO

Check the IC202 and replace

2. DC/DC TROUBLESHOOTING FLOW

LGE Internal Use Only

2-6

No sound

IC109

Input/Output check

IC204/205 Input check

YES

NO

Is Check about

CN101 pin28, 30?

Check and IC109 replace

YES

NO

JK701 Output check

Graphic FL no operation

Check the CN103

pin15, 16, 17 5V/3.3V?

Check the DC-DC CN902 + 5V.

YES

NO

Check the IC110/105

data line?

Replace IC110 / 105

YES

NO

Check the IC101 pin1~9, 73~80

µ-com IC

Is check IC101

pin19, 20, 50 +5V?

Check IC101 pin1 PWR_SENSE +5V?

YES

NO

Is Check X101

Ocillation O.K?

X101 replace

YES

NO

IC101 replace

NO

Check the IC101 pin10 reset.

Only for training and service purposes

LGE Internal Use Only

2-7

DVD no video output

Check the

R1048 +5.6V?

Check the AMP/SMPS +5.6V.

YES

NO

Check the

IC503 pin29, 43 +3.3V.

Check the CN902 pin9 ~ 11 +3.3V

YES

NO

Replace the IC503

HDMI no output

Check the TV option.

Change the HDMI(PAL).

YES

NO

Check FB915 +5V?

Replace IC801

YES

NO

Check the IC507 pin109, 110

AMP IC

Check The IC701/702

output signal.

Check IC101 pin1 PWR_SENSE +5V?

YES

NO

Is check Vcc line?

Refer to the power part.

YES

NO

Check the DC power component

Replace AMP IC

NO

Check the IC701 / 702 output signal.

LGE Internal Use Only

2-8

"PROTECTION" appears on the FLD.

"PROTECTION"

appears continuously

on the FLD

OK.

YES

After unplug power cord, connect again.

Power on.

NO

Is the IC101 pin25

"LOW" signal(0V)?

Replace IC101.

YES

NO

Is the Q701 normal?

Replace the Q701.

YES

NO

Replace TI AMP IC(IC701, IC702).

3. AMP PROTECTION

Only for training and service purposes

LGE Internal Use Only

2-9

WAVEFORMS

1. WHEN POWER ON, RESET (DVD & µ-COM) WAVEFORM

IC507

• RESET(DVD) : PIN2

• RESET(u-COM) : PIN10

2. AT USB FUNCTION, DP, DM WAVEFORM

IC501

Playing at USB function

• USB_N:PIN71

• USB_P:PIN73

LGE Internal Use Only

2-10

3. STARTING ACTION WAVEFORM IN MD DEVICE

IC401

1. SLO

2. SLED1+ : PIN39

3. SLED2- : PIN38 (At Power on)

4. AT DVD FUNCTION

IC401

1. FDO : PIN5

2. F+ : PIN52

3. F- : PIN51 (INSERT DVD)

Only for training and service purposes

LGE Internal Use Only

2-11

5. AT POWER ON, SPINDLE SIGNAL AT MD DECK

IC401

1. Spin : PIN26

2. Spin+

3. Spin-

6. TRACKING SIGNAL

IC401

1. Tro : PIN4

2. Tr- : PIN53

3. Tr+ : PIN54

LGE Internal Use Only