LG SH33SU-S, SH33SU-W, SH33SD-S, SH33SD-W Service Manual

MODEL: HT303SU(SH33SU-S/W)/HT353SD(SH33SD-S/W)

SERVICE MANUAL

P/NO : AFN33723386 JANUARY, 2008

DVD/CD RECEIVER

SERVICE MANUAL

MODEL: HT303SU(SH33SU-S, SH33SU-W)/

HT353SD(SH33SD-S, SH33SD-W)

Website http://biz.lgservice.com

Internal Use Only

HT303SU

HT353SD

1-1

LGE Internal Use Only

[CONTENTS]

❍ SECTION 1. GENERAL

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

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

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

•

HOW TO UPDATE AUDIO MICOM & DVD PROGRAMS

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

❍ SECTION 2. ELECTRICAL PART

• TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

• DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . . . . . . . . . . . . . . .2-13

• INTERNAL BLOCK DIAGRAM OF ICs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-25

• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-45

• OVERALL BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-47

• CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-49

• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-69

❍ SECTION 3. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

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

• DECK MECHANISM EXPLODED VIEW(DP-12TV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

• PACKING ACCESSORY SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

• SPEAKER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

❍ SECTION 4. MECHANISM (DP-12TV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

❍ SECTION 5. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Only for training and service purposes

LGE Internal Use Only

1-2

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 lens.

6) Never attempt to disassemble the pick-up. Spring has 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 allow contact with fingers or other exposed skin.

Magnet

How to hold the pick-up

Conductive Sheet

Cotton swab

Pressure

SECTION 1. GENERAL

1-3

LGE Internal Use Only

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 or 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.

Resistor (1 Mohm)

Conductive Sheet

Resistor (1 Mohm)

Armband

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 surface

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

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

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

Only for training and service purposes

LGE Internal Use Only

1-5

LGE Internal Use Only

SERVICE INFORMATION FOR EEPROM (DVD PART)

POWER ON

DVD LOGO Status (NO Disk status)

Remote control Pause key-->1-->4-->7-->2 in order.

Press number 0~9, Press character A~F (1~6 for a while)

Use arrow key ( ) to move to appropriate position and make changes

Press pause key once

Change will be applied when power

OFF-->ON.

DETECT NEW EEPROM (OPTION EDIT SCREEN)

NAME

OPT 1 OPT 2 OPT 3 OPT 4 OPT 5 OPT 6 OPT 7 OPT 8 OPT 9 OPT A OPT B OPT C OPT D OPT E OPT F OPT G

HEX

44 45 30 FF 22

05 FC 32

AC

00 00 00 00 00 00 00

45 53 11 FF 22

05 FC 32

AC

00 00 00 00 00 00 00

48 55 20 FF 22

05 FC 32

AC

00 00 00 00 00 00 00

52 4F 20 FF 22

05 FC 32

AC

00 00 00 00 00 00 00

<A>

HEX

<B>

HEX

<C>

HEX

<D>

<A> Germany, Austria, Netherlands, France (LGEDG) <B> Spain, Portugal, Greece, Italy (LGEES) <C> Hungary, Czech Republic (LGEMK) <D> Romania (LGERO)

Only for training and service purposes

LGE Internal Use Only

1-6

SERVICE INFORMATION FOR EEPROM (AMP PART)

POWER ON

FLD no disc status

Remote control ‘2’ + Front ‘STOP’

push same timing during 5s

FLD ‘OP-0….

Use arrow key ( ) move to appropriate position and make changes

Press ENTER key once

FLD ‘write ok’ or ‘up ok’

Remote control ‘2’ + Front ‘STOP’

push same timing

FLD display E2P CLR or EP CLR

Auto power off

MODEL : HT303 NAME HEX

OPT 1 82 OPT 2 CA OPT 3 21 OPT 4 27 OPT 5 00

MODEL : HT353 NAME HEX

OPT 1 82 OPT 2 CA OPT 3 20 OPT 4 27 OPT 5 00

DETECT NEW EEPROM (OPTION EDIT SCREEN)

1-7

HOW TO UPDATE AUDIO MICOM & DVD PROGRAMS

LGE Internal Use Only

1. How to update AUDIO MICOM program.

[Update using CD]

1. Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted. ex) HT353 : “HT353_0709081.HEX”

2. Copy the file to the root folder of a CD and burn it.

3. Insert the CD to the SET, and move to the DVD function. Then the upgrade process will be started with the upgrade information.

4. If the upgrade process is complete, the set will be rebooted with “Complete” message.

[Update using USB]

1. Change the filename to download as “(MODEL NAME)_(Version).HEX”. Only upper cases are permitted. ex) HT353 : “HT353_0709081.HEX”

2. Copy the file to the root folder of USB storage.

3. Put the USB into the SET, and move to the USB function. Then the upgrade process will be started with the upgrade information.

4. If the upgrade process is complete, the set will be rebooted with “Complete” message.

2. How to update DVD program.

[Update using CD]

1. Rename the filename to download as “TARGET.BIN” in upper cases.

2. Copy the file to “\MTK_UPG\” folder of CD, and burn it. Ex) P:\MTK_UPG\TARGET.BIN

3. Insert the CD to the SET, then after a while the CD tray will be opened with upgrade information on the screen.

4. Remove the CD, and press UP key in remote controller.

5. Remove and reconnect the power cable when it changes to logo screen from upgrade information. Then the upgrade process is completed.

[Update using USB]

1. Rename the filename to download as “TARGET.BIN” in upper cases.

2. Copy the file to “\MTK_UPG\” folder of the formatted USB, and burn it. Ex) P:\MTK_UPG\TARGET.BIN

3. Move to the USB function, and insert the USB to the set. The upgrade information will be shown on the screen.

4. Remove the USB, press UP key of the remote control.

5. Remove and reconnect the power cable when it changes to logo screen from upgrade information. Then the upgrade process is completed.

1-8

Only for training and service purposes

LGE Internal Use Only

SPECIFICATIONS

(* Depending on the sound mode

settings and the source, there may be no sound output.)

GENERAL

Power supply Refer to main label Power consumption Refer to main label Net Weight 2.5 kg External dimensions (W x H x D) 360 x 62 x 305 mm Operating conditions Temperature: 5°C to 35°C, Operation status: Horizontal Operating humidity 5% to 85%

AMPLIFIER

Output Power Front: 45W + 45W (Rated Output Power 30W, THD 10%)

Center*: 45W Surround*: 45W + 45W (Rated Output Power 30W, 4 Ωat 1 kHz, THD 10%) Subwoofer*: 75W (Rated Output Power 60W, 8 Ωat 30 Hz, THD 10%)

SPEAKERS (SH33SU)

Front/Rear/Center Speaker Passive Subwoofer

(SH33SU-S) (SH33SU-W) Impedance 4Ω 8 Ω Net Dimensions 99 x 114 x 86 mm 156 x 325 x 320 mm (W x H x D) Net Weight (1EA) 0.35 kg 3.5 kg

SPEAKERS (SH33SD)

Front/Rear/Center Speaker Passive Subwoofer

(SH33SD-S) (SH33SD-W) Impedance 4Ω 8 Ω Net Dimensions 99 x 114 x 86 mm 156 x 325 x 320 mm (W x H x D) Net Weight (1EA) 0.35 kg 3.5 kg

Designs and specifications are subject to change without notice.

2-1

LGE Internal Use Only

SECTION 2. ELECTRICAL PART

TROUBLESHOOTING GUIDE

1. Power Supply Circuit

YES

NO

Check power plug and power

supply circuit.

NO

Check power supply circuit.

NO

Check laser circuit.

Check focus circuit.

Check disc.

NO

Check tracking servo circuit.

NO

Check audio circuit.

Does red power led

turn on?

YES

Is power on?

YES

Does red power led

turn on?

YES

Does it play?

YES

Does it output

audio?

YES

Turn power on.

INSERT POWER CORD.

OK

2-2

Only for training and service purposes

LGE Internal Use Only

2. Front circuit (1/2)

NO NO

Reconnect it.

YES

YES YES

Check if

PN103 is ok?

Red LED turn off?

NO

Refer to SMPS part.

YES

Check if the front

power is ok?

Is the Digitron on

correctly?

NO NO

Check pattern and resoldering

YES

Check if

RC2 is ok?

Check if the remote

control is ok?

YES

Check if all

buttons are ok?

POWER ON.

Front B/D ok.

1

2

2-3

LGE Internal Use Only

3. Front circuit (2/2)

1

NO

Refer to power(SMPS).

NO

Replace R345 ~ R350.

Check if the

power part of the

front is ok?

YES

Check if

R345~R350

ok?

YES

Refer to MICOM circuit.

2

NO

Refer to power(SMPS).

NO

Check RM circuit

Check if the power

part of the front is ok?

YES

NO

Refer to MICOM circuit.

Check if the remote

control waveform of PN301

pin5 is ok?

YES

Check if RC2

voltage is ok(5V)?

YES

Resolder or Replace RC2.

Only for training and service purposes

LGE Internal Use Only

2-4

4. System operation flow

YES

Tray closed?

1. Initializes SERVO, DSP & RISC registers.

2. Write RISC code to SDRAM.

3. Reset RISC.

Show LOGO.

Tray close to closed position.

SLED at inner

side?

Recieve

OPEN/ CLOSE

Key?

Receive

CLOSE Key?

SLED moves to inner position.

1. Judge whether have disc and disc type.

2. Jump to related disc reading procedure.

1. Execute Pressed Key & IR Key.

2. System operation routine loop.

NO

YES

1. Stop Playback & Open Tray.

2. Display tray open message & LOGO.

POWER ON.

LGE Internal Use Only

2-5

5. Test & debug flow

YES

NO

Check the POWER PART.

NO

Check the POWER PART.

Check the

AC voltage Power PCBA (110V

or 220V).

YES

NO

Check the regulators or diode.

NO

1. Check 27MHz system clock.

2. Check system reset circuit.

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

4. Check FLASH Memory related circuit.

NO

Replace FLASH.

Are the

DC Voltage outputs OK? (12V, 5.6V,

3.5V, 5V,7V, 34V).

YES

Are 3.5V and

5V DC outputs normal on main

PCBA?

YES

Update

FLASH successfully?

YES

Switch on the Power PCBA.

TEST.

A

Only for training and service purposes

LGE Internal Use Only

2-6

NO

Check connection lines between FLASH &MT1389/L and the FLASH access time whether is suitable or not.

YES

Check AV cable

connection to TV set.

YES

Flash

Memory operates

properly?

NO

Check connection lines between SDRAM(IC504) & MT1389/L and the SDRAM is damaged.

SDRAM

works properly?

NO

Check the related circuit of MT1389/L IC501 Pins99, 102, 103, 104.

MT1389/L

VIDEO outputs

properly?

Show LOGO?

NO

Check the load OPEN &

CLOSE switch.

Check AV cable connection between main PCBA and loader. (MECHA)

YES

Normal

OPEN_SW,

CLOSE_SW

signal?

NO

Check the Tray control IO pins

on MT1389/L.

Normal

IN_SW & OUT_SW

signal?

NO

Check the Tray control MOTOR

& SERVO circuit IC401.

Normal

LOAD+ & LOAD-signal?

Does

Tray move inside when it

is not at closed

position?

Power On.

A

B

LGE Internal Use Only

2-7

NO

Check the connection line of DRV_MUTE.

YES

Check the cable connection

with MECHA.

Do not put in disc

and close tray.

YES

Motor

Driver DRV_MUTE

pin is high?

NO

Check the related circuit of SLEGN.

Motor

Driver DRV_MUTE

pin is High?

NO

Check the amp circuit on motor driver.

SLED+ and

SLED- output

properly?

Does

the SLED move to inner

side when it is at outer

position?

NO

Check Focus connection on MT1389/L and motor driver.

Check cable connection with

pick-up head.

YES

Proper Focus outputs

to motor dricer?

NO

Check the amp circuit on motor

driver.

Proper F+ & F- outputs?

Optical Lens

has movements for

searching Focus?

B

C

Only for training and service purposes

LGE Internal Use Only

2-8

NO

Check the laser power circuit on MT1389/L and connecting to power transistor. (Q401, Q402).

YES

Check cable connection

between transistor output and

pick-up head.

Laser off.

Check the RF connection

between AM5890 and MT1389/L.

YES

DVDLD or

CDLD output

property?

NO

Check the related circuit on laser power transistor.

Collector

voltage of power transistor

is OK?(Q401, Q402)

Laser turns on when

reading disc?

Put disc in?

NO

Check the SPINDLE related

circuit on MT1389/L.

Check the cable connection

between spindle and main

PCB.

YES

Proper

SPINDLE signal on

MT1389/L.

NO

Check the spindle control amp

circuit of motor driver.

SPNP

SPNN output

properly?

Does spindle rotate?

NO

Check the related circuit on

MT1389/L RF signal.

Proper

RF signal on MT1389/L.

Disc ID is correct?

C

D

LGE Internal Use Only

2-9

NO

Check connections between MT1389/L and pick-up head.

YES

Check CD_DVDCT connection

between AM5890 and

MT1389/L.

Check cable connection

on pick-up head.

YES

Proper

signals on A, B, C,

D of MT1389/L.

NO

Check the related circuit on MT1389/L CD-DVDCT.

Proper

CD-DVDCT signal

on MT1389/L.

Focus on ok?

NO

Check RF signal waveform.

Disc Playback?

NO

Check the related circuit on

MT1389/L.

NO

Check the TRACK connection

on MT1389/L and motor driver.

NO

Check the tracking control amp

circuit on motor driver.

Proper

CD-DVDCT signal

on MT1389/L.

YES

Proper

TRACK signal

on MT1389/L.

YES

TR+ & TR-output

properly?

Track On OK?

D

E

Only for training and service purposes

LGE Internal Use Only

2-10

NO

Check connection between IC704 BCK, LRCK, ADATAO.

YES

Check Digital Amp circuit

(IC702, IC703).

YES

PWM IC

received correct data

stream?

NO

Check the related circuit of PWM.(Check Audio out Pins 55, 59, 61, 62, 68, 71, 75).

Normal

PWM IC out?(IC704).

Normal Audio

output when disc

playback?

E

TEST END.

LGE Internal Use Only

2-11

6. AMP Protection

YES

NO

OK.

"PROTECTION"

appears continuously on the FLD.

YES

NO

Replace IC101.

Is the IC101 pin54

"LOW" signal(0V)?

YES

NO

Replace the Q701 and Q702.

Is the Q701 and Q702 normal?

YES

After unplug power cord, connect again.

YES

Power on.

"PROTECTION" appears on the FLD.

Replace ST AMP IC(IC702 and IC703)

Only for training and service purposes

LGE Internal Use Only

2-12

7. AUDIO µ-COM Circuit(DVD & AMP)

Check DVD Module.

Check SMPS.

OK

YES

Power On.

Does

CD/DVD appear at

FLD?

YES

NO

Does

Loading appear

at FLD?

Does

it appear DVD Error

at FLD?

Does Aux,

Scart, opt and FM 87.5

appear at FLD.

YES

Does

no Disc or Time

appear at FLD?

YES

Check

if DVD an audio

micom insert is

OK.

Check Power.

YES

Replace IC101.

YESNO

NO

Refer to SMPS.

NO

Refer to oscillator circuit.

NO

Check IC101 reset

waveform.

NO

YES

Check

power part of Main

B/D.

Check

oscillator o

X101.

Check

if IC101 Pin5

is high.

YES

Check 3.3V line.

NO

Check power section

circuit.

NO

Check

if IC101 Pin9,36,59 are

high(5V).

Check

if IC101 Pin49

is high.

YES

LGE Internal Use Only

2-13

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

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

1)

MT1389/L

main clock is at 27MHz(X501)

1

3 2

4

FIG 1-1

2)

MT1389/L

reset is high active.

Power Cord in

FIG 1-2

1

2

3

4

1

2

3

4

IC501

Only for training and service purposes

LGE Internal Use Only

2-14

2. SDRAM CLOCK

1)

MT1389/L

main clock is at 27MHz(X501)

DCLK = 93MHz, Vp-p=2.2, Vmax=2.7V

FIG 2-1

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

FIG 1-4

1

2

1

2

1

LGE Internal Use Only

2-15

3) Tray open waveform

FIG 3-3

3. TRAY OPEN/CLOSE SIGNAL

1) Tray open/close waveform

FIG 3-1

2) Tray close waveform

FIG 3-2

2

1

3

4

1

2

3

4

1

2

3

4

1

2 3

4

Only for training and service purposes

LGE Internal Use Only

2-16

4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION)

FIG 4-1

1

2

3 4

1

2

3

4