LG DM2740, CMS2730F Schematic

DVD Micro Hi-Fi System

SERVICE MANUAL

MODEL:

DM2740

(DM2740, CMS2730F)

CAUTION

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

MODEL: DM2740 (DM2740, CMS2730F)SERVICE MANUAL

4102 ,JUNE76615056NFA : ON/P

Website http://biz.lgservice.com

Internal Use Only

CONTENTS

SECTION 1 ........ SUMMARY

SECTION 2 ........ CABINET & MAIN CHASSIS

SECTION 3 ........ ELECTRICAL

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

1-1

SECTION 1

SUMMARY

CONTENTS

SERVICING PRECAUTIONS ................................................................................................................... 1-3

ESD PRECAUTIONS .................................................................................................................................. 1-5

FIRMWARE UPGRADE ............................................................................................................................. 1-6

1. MPEG

2. AUDIO MICOM

3. TOUCH

EEPROM OPTION SETTING ................................................................................................................... 1-7

SYSTEM RESET .......................................................................................................................................... 1-7

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

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.

Storage in conductive bag

Drop 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.

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

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.

Pressure

Magnet

How to hold the pick-up

Cotton swab

Conductive Sheet

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.

1-3

Pressure

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 (1 MΩ)

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.

Armband

Resistor
(1 MΩ)

Resistor
(1 MΩ)

Conductive
Sheet

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.

1-5

FIRMWARE UPGRADE

1. MPEG

1) Copy fi rmware to USB (Do not change fi le name).
Ex) LG_DM2740LD1_1403190.rom

2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.

3) Inset USB device which includes fi rmware.

4) Firmware is detected automatically and then, shows blue screen in TV.

Ö If home menu is maintained after inserting USB, press music Icon.

5) Take off the USB and press PLAY key.

6) and then, upgrading is started.

- Do not turn off the set until upgrade is fi nished.

7) After fi nishing fi rmware upgrading, set will restart automatically.

8) Power off and on again by pressing POWER key.

2. AUDIO MICOM

1) Copy fi rmware to USB (Do not change fi le name).

Ex) DM2740_1403250.HEX

2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.

3) Inset USB device which includes fi rmware.

4) Firmware is detected automatically and then, shows blue screen in TV.

Ö If home menu is maintained after inserting USB, press music Icon.

5) Upgrading is started.

- Do not turn off the set until upgrade is fi nished.

- Do not pull out the USB device using fi rmware upgrading.

6) After fi nishing fi rmware upgrading, set will be turned off.

3. TOUCH

1) Copy fi rmware to USB (Do not change fi le name).

Ex) DM2740T_1402040.dld / TC390_LG_CMDM2740_140204_0.hex

2) Change function to DVD/CD by pressing input key, and wait until home menu is shown.

3) Inset USB device which includes fi rmware.

4) Firmware is detected automatically and then, shows blue screen in TV.

=> If Home menu is maintained after inserting USB, press music Icon.

5) Upgrading is started.

- Do not turn off the set until upgrade is fi nished.

- Do not pull out the USB device using fi rmware upgrading.

6) After fi nishing fi rmware upgrading, set will be turned off.

1-6

EEPROM OPTION SETTING

1) Change function to DVD/CD by pressing input key, and wait until home menu is shown.

- Do not insert disc or USB at the set.

2) Press "PAUSE 1 4 7 2" in order.

3) and then, option setting menu is displayed.

You can see 10 bytes option value.
Ex ) F9 00 C1 D4 00 11 90 10 E0 08

4) Move a cursor by pressing Arrow < > key.

5) Press Num key what you want to change.

6) Press "PAUSE" key to exit option setting menu.

After change option value, you need to make system reset.

SYSTEM RESET

1) Change function to DVD/CD by pressing input key, and wait until home menu is shown.

- Do not insert disc or USB at the set.

2) Go to SETUP menu by pressing SETUP button in HOME menu.

3) Move highlight at "DISPLAY -> TV Aspect -> 16:9".

4) Press "1 3 9 7 1 3 9 Enter" in order.

5) and then, system reset menu is displayed.

6) Power off and on by pressing POWER key.

1-7

SPECIFICATIONS

• GENERAL

Power requirements Refer to the main label.
Power consumption Refer to the main label.
Dimensions (W x H x D) (135 x 295 x 315) mm
Net Weight (Approx.) 3.7 kg
Operating temperature 41 °F to 95 °F (5 °C to 35 °C)
Operating humidity 5 % to 90 %

• INPUTS/ OUTPUTS

VIDEO OUT 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
HDMI OUT (video/audio): 19 pin Type A, HDMI™ Connector
DIGITAL IN (OPTICAL): 3 V (p-p), Optical jack x 1
PORT. IN 0.5 Vrms (3.5 mm stereo jack)

• SYSTEM

Laser Semiconductor laser, wavelength: 650 nm
Signal system Standard NTSC color TV system
Frequency response 20 Hz to 20 kHz (48 kHz, 96 kHz, 192 kHz sampling)
Signal-to-noise ratio More than 80 dB
Harmonic distortion 0.05 % at 1 W
Dynamic range More than 85 dB
Bus Power Supply 5 V 1 A

• AMPLIFIER

Stereo mode 80 W + 80 W (4Ω at 1kHz)

• TUNER

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz

• FRONT SPEAKER

Type 3 Way 4 speaker
Impedance 4 Ω
Rated Input Power 80 W
Max. Input Power 160 W
Dimensions (W x H x D) (126 X 295 X 315) mm
Net Weight 3.5 kg

• Design and specifications ae subject to change without notice.

1-8

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

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

1. CABINET AND MAIN FRAME SECTION (DM2740) ................................................................................ 2-3

2. DECK MECHANISM SECTION (SDP-08) ................................................................................................ 2-5

3. PACKING ACCESSORY SECTION ......................................................................................................... 2-7

4. SPEAKER SECTION (CMS2730F)........................................................................................................... 2-8

2-1

2-2

B

F

445

A26

G

D

E

C

260L

260R

251

253

254

261

A47

264

263

A42

A43

A44

267

268

262

CABLE2

SMPS

FRONT

USB

A

470

462

462

462

265

462

462

462

252

273

B/T

C

E

F

D

A

B

A46

MAIN

464

H

H

269

A48

A52

CABLE4

291

NFC

462

462

464

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (DM2740)

NOTES) THE EXCLAMATION POINT WITHIN AN

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

G

300

2. DECK MECHANISM SECTION (SDP-08)

A26

011

010

037

012

012

012

023

023C

023B

3. PACKING ACCESSORY SECTION

801 Owner’s Manual

808 Battery

811 Video cable

803 Packing

823 HDMI cable

825 FM antenna

900 Remote control

804 Bag

802 Box

4. SPEAKER SECTION (CMS2730F)

A60R

A60L

SECTION 3

ELECTRICAL

CONTENTS

ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2

1. NO POWER PROBLEM ......................................................................................................................... 3-2

2. SPEAKER NO AUDIO OUTPUT ............................................................................................................ 3-3

3. USB NO DETECT ................................................................................................................................... 3-4

4. NO BOOTING ......................................................................................................................................... 3-5

ELECTRICAL TROUBLESHOOTING GUIDE ................................................................................................... 3-6

1. POWER (SMPS) ..................................................................................................................................... 3-6

2. P-SENS ................................................................................................................................................... 3-6

3. VKK CHECK ........................................................................................................................................... 3-6

4. μ-COM PART CHECK-1 ......................................................................................................................... 3-7

5. μ-COM PART CHECK-2 ......................................................................................................................... 3-7

6. FLD DISPLAY CHECK ........................................................................................................................... 3-8

7. TOUCH PART CHECK ........................................................................................................................... 3-9

8. PWM MODULATION CHECK ............................................................................................................... 3-10

9. POWER AMP PART CHECK ............................................................................................................... 3-11

10. VIDEO PART CHECK ........................................................................................................................... 3-12

11. TUNER FUNCTION CHECK ................................................................................................................. 3-13

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING ....................................................... 3-14

1. SYSTEM 27 MHz CLOCK,RESET,FLASH R/W SIGNAL .................................................................... 3-14

2. SDRAM CLOCK .................................................................................................................................... 3-16

3. VIDEO PART (100% FULL COLOR-BAR) ........................................................................................... 3-16

4. HDMI PART .......................................................................................................................................... 3-17

WIRING DIAGRAM .......................................................................................................................................... 3-19

BLOCK DIAGRAM .......................................................................................................................................... 3-21

CIRCUIT DIAGRAMS ...................................................................................................................................... 3-23

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-23

2. MAIN - MICOM CIRCUIT DIAGRAM .................................................................................................... 3-25

3. MAIN - MPEG CIRCUIT DIAGRAM ...................................................................................................... 3-27

4. MAIN - RF SERVO CIRCUIT DIAGRAM .............................................................................................. 3-29

5. MAIN - I/O & ADC CIRCUIT DIAGRAM ............................................................................................... 3-31

6. MAIN - PWM & AMP CIRCUIT DIAGRAM ........................................................................................... 3-33

7. FRONT VFD CIRCUIT DIAGRAM ........................................................................................................ 3-35

8. FRONT JACK CIRCUIT DIAGRAM ...................................................................................................... 3-37

CIRCUIT VOLTAGE CHART ........................................................................................................................... 3-39

1. ICs ......................................................................................................................................................... 3-39

2. CONNECTORS ..................................................................................................................................... 3-41

3. CAPACITORS ....................................................................................................................................... 3-41

PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-43

1. SMPS P.C.BOARD ............................................................................................................................... 3-43

2. MAIN P.C.BOARD ................................................................................................................................ 3-47

3. FRONT VFD P.C.BOARD ..................................................................................................................... 3-49

4. FRONT JACK P.C.BOARD ................................................................................................................... 3-51

3-1

ONE POINT REPAIR GUIDE

1. NO POWER PROBLEM

No power problem occurs when you power on the unit.

1-1. Solution

Replace X100, IC101, IC103.

1-2. How to troubleshoot (Countermeasure)

1) Check X100 (Crystal).

 If it does not oscillate, change X100.

2) Check IC103 (Reset IC).

 IF its output voltage is not more than +2.7 V, change IC103.

3) Check IC101 (Micom).

 After Power is ON if the pin63 of IC101 is not ‘High’, change IC101.
But, the new μ-com IC need to write program.

1-3. Service hint (Any picture / Remark)

IC101

X100

< MAIN board top view > < MAIN board bottom view >

IC103

3-2

ONE POINT REPAIR GUIDE

2. SPEAKER NO AUDIO OUTPUT

No audio output problem occurs when you power on the unit.

2-1. Solution

Reassemble AMP IC heat-sink, replace IC700.

2-2. How to troubleshoot (Countermeasure)

1) Reassemble AMP IC heat-sink (heat-sink screw must be assembled tightly).

2) Still NG, please check IC700 Pin1, 2, 22(12 V), Pin29, 30, 31, 36, 37, 38 (26 V).

3) If it is not appear Vcc, change SMPS board assembly.

2-3. Service hint (Any picture / Remark)

< MAIN board top view >

3-3

IC700

ONE POINT REPAIR GUIDE

3. USB NO DETECT

When USB insert, USB no detect on the unit.

3-1. Solution

Replace IC311.

3-2. How to troubleshoot (Countermeasure)

1) Please check IC311.

 Pin3 : 5 V

2) If it is not OK, replace IC3A8.

3-3. Service hint (Any picture / Remark)

IC311

< FRONT JACK board top view >

3-4

ONE POINT REPAIR GUIDE

4. NO BOOTING

When you turn on unit, it will display “Hello” or “Please wait” message continuously on front
panel, and it will not boot-up normally.

4-1. Solution

Replace X500.

4-2. How to troubleshoot (Countermeasure)

1) Please check the soldering status of 27 MHz crystal (X500).

2) Please check the frequency of 27 MHz crystal (X500).

3) If the crystal doesn’t oscillate, replace X500.

4) After changing it, if the set is still not booting, replace MAIN board assembly.

4-3. Service hint (Any picture / Remark)

X500

< MAIN board top view >

3-5

ELECTRICAL TROUBLESHOOTING GUIDE

1. POWER (SMPS)

Power (AC cord in)

Check if PVDD

voltage of CN901 on Main BD

is 25~26 V.

YES

OK

2. P-SENS

μ-COM, P-SENS

Check R186

if DC V is over 3.3 V.

NO

Detach harness of CN901.

YES

Check if PVDD

voltage of CN901 on SMPS BD

is 25~26 V.

YES

Replace IC907.

NO

Check IC206 DC/DC circuit

and power circuit troubleshooting.

NO

Replace SMPS BD.

YES

OK

3. VKK CHECK

VKK check

Check IC205

Pin7 Vin(26V), CA202(-) DC V

is over -30 V.

YES

OK

NO

Check IC205 DC/DC circuit

and power circuit troubleshooting.

3-6

ELECTRICAL TROUBLESHOOTING GUIDE

4. μ-COM PART CHECK-1

μ-com part check-1

Check

L206 3.7VA.

NO

YES

Check

both end voltage

of R186.

NO

YES

YES

OK OK

5. μ-COM PART CHECK-2

μ-com part check-2

Refer to

SMPS troubleshooting.

Check If

emitter voltage of Q103

is over 3.7 V.

YES

Check if Q103 of collector

voltage is over 2.7 V.

YES

NO

Check the periphery of Q103.

NO

Replace Q103.Check voltage of IC101 Pin4.

Check

L206 3.7 VA.

YES

Check

if output of D100,D101 is

3.3 V.

YES

Check If IC101_Pin14, 40, 55, 89

are 3.3 V.

YES

Check the operation.

X100: 12 MHz, X101: 32.768 kHz

YES

OK

NO

NO

Refer to

SMPS troubleshooting.

Replace D100, D101.

3-7

ELECTRICAL TROUBLESHOOTING GUIDE

6. FLD DISPLAY CHECK

FLD display check

Check

IC205 Pin7(26 V)

voltage.

YES

Check if both end voltage of

FL+, FL- are -24V, -28V

VKK : -31V.

YES

Check IC301

Pin9 (3.3 V)

Pin50 VKK (-31 V).

YES

NO

NO

Refer to

SMPS troubleshooting.

Check CN301 connection.

YES

Check each
Pin voltage.

YES

OK

If voltage is not 3.3 V,

check input and output of D301.

YES

NO

Check FFC cable.

Check

data communication

IC101-->IC301

Pin27-->Pin3 STB,

Pin26-->Pin2 DATA,

Pin28-->Pin1 CLK

NO

YES

YES

OK OK

Check IC301.

YES

OK

Check DATA input

IC101: Pin26, 27, 28.

YES

Check DATA output

IC101: Pin26.

YES

Check IC101.

YES

NO

NO

Replace IC301.

Replace IC101.FLD light on?

3-8

ELECTRICAL TROUBLESHOOTING GUIDE

7. TOUCH PART CHECK

Touch part check

IC303 Pin1

voltage 3.3 V OK?

YES

Check TOUCH_IRQ signal(IC303 Pin6)

When you touch pad, it is ‘Low’.

When you non-touch pad, it’s ‘High’.

YES

TOUCH_DAT,

CLK signal OK?

YES

OK

NO

NO

NO

Check the FFC cable.

Replace IC303.

Check the connection,

or replace IC101.

3-9

ELECTRICAL TROUBLESHOOTING GUIDE

8. PWM MODULATION CHECK

PWM modulation

part check

IC602 Pin9, 14, 35, 50

Check

3.3 V.

YES

Check

X600 12.288 MHz

operation.

YES

IC602

Pin16: PWM RESET

Pin20: PWM SDA
Pin21: PWM SCL

YES

IC602(TAS5548) data input

Pin22,23,24(LRCK,BCK,

Check

DATA)

NO

NO

NO

NO

IC203 DC/DC circuit

and replace IC602.

Replace X600.

Check

line resistor output

SDA: R610, SCL: R611,

RST: R616..

YES

OK

Check

IC500 DVD MPEG

I2S output.

NO

NO

Replace related resistor.

Replace IC500.

YES

Check

PWM 46, 47, 48, 49 (SPK)

PWM 1, 2, 3, 4 (HP).

YES

OK

NO

YES

OK

Check IC602

HP SEL: Pin17

MUTE: Pin19.

YES

OK

3-10

NO

Replace IC602.

ELECTRICAL TROUBLESHOOTING GUIDE

9. POWER AMP PART CHECK

Power AMP part check

CN901

Pin1, 2, 3: 26 V.

YES

Check each IC700

Pin29, 30, 31, 36, 37, 38 voltage.

YES

Check

IC700 Pin1, 2, 22: +12 V

input.

YES

Check PWM modulator input

each Pin5, 6, 14, 15.

YES

Power IC700

Pin27, 28, 32, 35, 39, 40 output.

YES

Check output line coil.

NO

NO

NO

Refer to SMPS troubleshooting.

Check each line resistor output voltage.

Replace the coil.

OK

YES

3-11

ELECTRICAL TROUBLESHOOTING GUIDE

10. VIDEO PART CHECK

Video part check

pin of D502 are short with each

Check each

other?

NO

JK501 Pin3

video signal OK?

YES

Check external

cable OK?

YES

If it’s still NG,

check display device(TV or monitor).

YES

OK

YES

NO

NO

Check or replace D502.

Check or replace

L501, C567, C568, R599.

Replace the cable.

3-12

ELECTRICAL TROUBLESHOOTING GUIDE

11. TUNER FUNCTION CHECK

Tuner function check

tuner module(TU100)

Check

operation.

YES NO

Check IC201(CS5346) Pin41,42,43,44

output waveform.

YES

Waveform OK?

YES

Check IC500

Pin48, 49, 50, 51 I2S signal.

YES

OK?

YES

NO

NO

NO

Check tuner module voltage

(Pin6 : +3.3 V).

Replace the module.

Check or replace IC201, IC207.

Replace IC500.

Refer to PWM part.

3-13

DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING

1

3

2

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

1)

MT1389FE/GH

2)

MT1389FE/GH

main clock is at 27 MHz(X500)

IC500

1

FIG 1-1

reset is high active.

DVD_RESET

3.3 V

2

1.2 V

3

4

IC500

FIG 1-2

IC500

4

3-14

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

5

6

SF_DI

SF_DO

5

6

FIG 1-3

3-15

8

2. SDRAM CLOCK

7

1)

MT1389FE/GH

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

SDCLK

main clock is at 27 MHz(X500)

7

IC502

FIG 2-1

3. VIDEO PART (100% FULL COLOR-BAR)

8

CVBS

3-16

4. HDMI PART

HDMI_SDA

9

11

10

HDMI_SCL

12

HDMI_CLK HDMI_DATA

3-17

9

10

11

12

3-18

3-19 3-20

FRONT VFD

(FR-4 EPOXY 2LAYER)

LOADER

MAIN

(FR-4 EPOXY 2LAYER)

SMPS

CN100 CN107 CN102

FAN

FRONT JACK

(FR-4 EPOXY

2LAYER)

CN201CN101

CN401CN400

BT

DAB

CN101

CN202

Harness
9P

Harness
15P

FFC
15P

FFC
12P

Harness
6P

FFC
9P

FFC
23P

WIRING DIAGRAM

3-21 3-22

TAS5612L

S56

SANYO

(100PIN)

SDRAM

(16MB)

FLASH

(4MByte)

DB[0-15]

DMA[0-10]

12 MHz

D+, D-

TUNER L/R

PORT L/R

USB

CVBS OUT

DVD_RESET

DVD_TX

DVD_RESET

DVD_RX

TUNER(FM)

PORTABLE

COMPOSITE

MTK1389GH

(176PIN)

27 MHz

ADC

(CS5346)

3.3/5V

CVBS

FO CUS/SLED
SPINDLE/TRACKING

F+/-, T+/-

SLED+/­SPINDLE+/-

MD_DVD, MD_CD
LD_DVD, LD_CD
VR_DVD, VR_CD

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

MD

OPU

Motor IC

(AM5890)

3.3/1.2V

HDMI OUT

TMDS

CEC_TX/RX

4CH,5V

3.3V

3.3V

SPI

I2C

5346_DATA

I2C,RESET

MCK,LRCK

BCK

1080P

5V

EEPROM

(2KByte)

I2C

32.768kHz

LC87F5NC8A

3.3V

3.3V

EEPROM

(2KByte)

3.3V 3.3V

LPF

AMP

3.3V

I2C

MCLK,LRCK, BCK,DATA

VFD Driver

MC3501

IR

TOUCH KEY * 10 EA

SPI

Touch

TC390

I2C

3.3V,Vkk

FL+,FL-

Key

3.3V

TPA6132A2

3.3V

FUNCTION KEY * 4 EA

PVDD(26V)

PWM

TAS5548

BT_SPDIF_IN

OPTIAL IN

CTRL

BT M/M

MODULE

LED * 11 EA

UART

3.3V

DAB L/R

DAB

LOAD+/-

OPEN/CLOSE

1CH,9.5V

CS8422

Motor IC

(DRV8837)

I2C

MCLK
BCK

LRCK
A_DATA

12V

FAN_CTRL

option

24.576MHz

BLOCK DIAGRAM

3-23 3-24

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

SMPS

EAX65707301_5.1.2_SMPS

2014. 03. 26

Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.

CAUTION:

Danger if fuse is incorrectly replaced.

Replace only with the type identical to fuse rating

and(or) model name described in main label.

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

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

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

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

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

IMPORTANT SAFETY

NOTE :

3-25 3-26

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

MICOM

EAX65726401_6.1.2_MAIN_SD

2014. 03. 28

2. MAIN - MICOM CIRCUIT DIAGRAM

3-27 3-28

8

1

4

3

2

9

10

11

12

7

5

6

: WAVEFORM NUMBER

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

MPEG

EAX65726401_6.1.2_MAIN_SD

2014. 03. 28

3. MAIN - MPEG CIRCUIT DIAGRAM

3-29 3-30

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

RF SERVO

EAX65726401_6.1.2_MAIN_SD

2014. 03. 28

4. MAIN - RF SERVO CIRCUIT DIAGRAM

3-31 3-32

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

I/O & ADC

EAX65726401_6.1.2_MAIN_SD

2014. 03. 28

5. MAIN - I/O & ADC CIRCUIT DIAGRAM

3-33 3-34

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

PWM & AMP

EAX65726401_6.1.2_MAIN_SD

2014. 03. 28

6. MAIN - PWM & AMP CIRCUIT DIAGRAM

3-35 3-36

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

FRONT VFD

EAX65726601_10.1.3_VFD_SD

2014. 03. 26

7. FRONT VFD CIRCUIT DIAGRAM

3-37 3-38

A

1

2

3

4

5

6

7

8

9

10

11

12

B C D E F G H I J K L M N O P Q R ST

FRONT JACK

EAX65726701_10.1.3_JACK_SD

2014. 03. 26

8. FRONT JACK CIRCUIT DIAGRAM

3-39 3-40

CIRCUIT VOLTAGE CHART

1. ICs

LOCATION NAME SPEC CLASSIFICATION PIN NUMBER SPEC ENG. VOLTAGE REAL VOLTAGE

MAIN BOARD

IC101 IC,Microcontrollers LC87F5WC8A

3.3VA 14 PIN

2.2 ~ 5.5

3.30 3.42

3V3MICOM 40,55,89 PIN 3.30 3.48

IC102 IC,EEPROM M24C16 3V3MICOM 8PIN 1.8 ~ 3.6 3.30 3.48

IC103 IC,Voltage Detector AZ7027RTRE1 3.7VA 1 PIN 0 ~ 18 3.50 3.58

IC201 IC,A/D Converter CS5346-CQZR

DVCC_3.3V 46PIN 3.13 ~ 3.47 3.30 3.24

AVCC_5V 14PIN 4.75 ~ 5.25 5.00 5.12

IC203

IC,DC,DC Converter MP1432 -0.3V to 48V 0.8V to 42V 2.5W SOIC T/REEL 8P MSL 2

VCC_12V 7 PIN 4.5~45 12.00 12.00

VOUT(3.3V) VOUT 0.8~42 3.30 3.31

IC204

VCC_12V 7 PIN 4.5~45 12.00 12.00

VOUT(5.6V) VOUT 0.8~42 5.60 5.60

IC206

26VA 7 PIN 4.5~45 26.00 24.77

VOUT(3.7V) VOUT 0.8~42 3.70 3.74

IC205

26VA 7 PIN 4.5~45 26.00 24.76

VOUT VOUT 0.8~42 12.00 12.07

IC207 IC,I/O Support Chip CS8422-CNZR DVCC 3.3V 3,19,22 PIN 3.135 ~ 3.465 3.30 3.24

IC208 IC,LDO Voltage Regulator LM37102D

5.6V 2PIN

2.25 ~ 16

5.60 5.57

VOUT(5V) 3 PIN 5.10 5.12

IC400 IC,Motor Driver AM5890 5ch dvd-p 4.3to13.2v 9v 1.7W HSOP R/TP 28P DVCC 5V 8,19 PIN 4.3 ~ 13.2 5.00 5.16

IC401

IC,Motor Driver

DRV8837 -0.3 ~ 7 0 0W WSON T/REEL 8P 1

VCC9.5 1 PIN 0~11 9.50 9.77

DVCC_3.3V 8 PIN 1.8~7 3.30 3.30

IC403 IC,Voltage Regulator AZ1117BH-ADJTRE1 15V ADJ 0W SOT223 R/TP 3P - BCD

VCC_12V 3 PIN 15.00 12.00 11.76

VCC9.5 2 PIN 15.00 9.50 9.50

IC500 IC,Video Processors MT1389FE/GH

DVCC 3.3V

2,12,22,38,57,67,101,134,135,14

0,142,151,152,163,164,

3.1 ~ 3.6 3.30 3.18

VCC 1.2V 1,25,79,109,165 1.1 ~ 1.3 1.20 1.22

IC501 IC,EEPROM M24C16 DVCC_3.3V 8 PIN 1.8 ~ 3.6 3.30 3.25

IC502 IC,SDRAM W9812G6JH-6 128MBIT DVCC 3.3V 1,3,9,14,27,43,49 3.0 ~ 3.6 3.30 3.24

IC602 PWM TAS5548 AVCC_3.3V 14,35,50 PIN 3 ~ 3.6 3.30 3.26

IC700 IC,Audio Amplifi er TAS5612LA 125-W Class-D

VCC_12V 2 PIN 10.8 ~ 13.2 12.00 11.65

GVDD 1,22 PIN 10.8 ~ 13.2 12.00 11.65

PVDD 36,37,38,29,30,31 PIN 12 ~ 34 26.00 25.60

IC701 IC,Audio Amplifi er TPA6132A2 AVCC_3.3V 14 PIN 2.3 ~ 5.5 3.30 3.27

FRONT JACK BOARD

IC311 IC,LDO Voltage Regulator TJ3966

VIN 1 PIN 0~7V 5.60 5.600

VOUT 3 PIN 5V 5.06 5.000

FRONT VFD BOARD

IC301 IC,Display Driver MC3501 3.3VA 9 PIN 2.7~5.5 3.30 3.370

RC301 Receiver Module R24FH7H 3.3VA 1 PIN 2.7~5.5V 3.3V 3.300

TOUCH BOARD

IC301 IC,Capacitive Touch Sensor TOUCHCORE390 8-BIT 3.3VA 1 PIN 2.7~3.6 3.30 3.360

3-41 3-42

2. CONNECTORS

3. CAPACITORS

LOCATION PIN NUMBER SPEC REAL VOLTAGE LOCATION PIN NUMBER SPEC REAL VOLTAGE

MAIN

Ù

SMPS

CN202

1,2,3 PVDD 25.4

CN901

1,2,3 PVDD 25.4

4,5,6 DGND 0 4,5,6 DGND 0

MAIN

Ù

TOP JACK

CN107

(TOP JCAK)

4,9,10,12 DGND 0

CN370

4,9,10,12 GND 0

11 USB_5.6V 5.6 11 VCC_5V 5.6

MAIN

Ù

VFD

CN102

(VFD)

3,7,14 DGND 0

CN301

1,2 3.7V 3.68

6 FL+ -26.2 4 VKK -28.9

5 FL- -21.9 5 FL- -21.9

4 VKK -28.9 6 FL+ -26.2

1,2 3.7VA 3.68 3,7 GND 0

MAIN

Ù

B/T

CN100 (B/T)

5.6 DVDD_3V3 3.27

1,11 DGND 0

LOCATION SPEC ENG. VOLTAGE REAL VOLTAGE

MAIN BOARD

C136 1000uF/6.3V 3.3 3.42

C137 220uF/16V 12 11.75

C283 10uF/16V 3.3 3.24

C284 10uF/16V 3.3 2.43

C298 10uF/16V 3.3 3.23

C404 220uF/16V 5 5.10

C489 100uF/16V 1.2 1.25

C701 470uF/50V 26 25.40

C732 470uF/50V 26 25.40

C902 4.7uF/50V 26 25.40

C907 4.7uF/50V 26 25.40

C910 1000uF/6.3V 4.5 4.88

C912 47uF/50V 22 21.90

C913 47uF/50V 30 29.20

C914 47uF/50V 27 26.30

C942 4.7uF/50V 26 25.40

C952 4.7uF/50V 26 25.40

C956 4.7uF/50V 26 25.40

LOCATION SPEC ENG. VOLTAGE REAL VOLTAGE

FRONT JACK BOARD

C377 10uF/16V 5.6 5.50

C3A4 10uF/16V 5.6 5.50

FRONT VFD BOARD

C346 100uF/16V 3.3 3.37

C349 47uF/50V 90 28.9

C350 47uF/50V 22 21.9

C353 47uF/50V 27 26.3

C354 47uF/16V 3.3 3.29

MIC BOARD

C3M4 22uF/16V 2 2

3-43 3-44

PRINTED CIRCUIT BOARD DIAGRAMS

1. SMPS P.C.BOARD

(TOP VIEW)

3-45 3-46

SMPS P.C.BOARD

(BOTTOM VIEW)

NOTE) Warning

Parts that are critical with respect to risk
of fire or electrical shock.

3-47 3-48

2. MAIN P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

3-49 3-50

3. FRONT VFD P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

3-51 3-52

4. FRONT JACK P.C.BOARD

(TOP VIEW) (BOTTOM VIEW)

3-53 3-54