LG RAT376B Schematic

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MODEL: RAT376B (RAS376BF/W)SERVICE MANUAL

Internal Use Only

Website http://biz.lgservice.com

Mini Hi-Fi System

SERVICE MANUAL

P/NO : AFN74972241 JANUARY, 2011

MODEL:

RAT376B

(RAS376BF/W)

CAUTION

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

CONTENTS

SECTION 1 ........ GENERAL

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

SERVICE INFORMATION FOR EEPROM .......................................................................................... 1-6

PROGRAM DOWNLOAD GUIDE ........................................................................................................... 1-7

SPECIFICATIONS ....................................................................................................................................... 1-9

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)

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

SERVICE INFORMATION FOR EEPROM

POWER ON

FLD no disc status or AUX status.

Remote control ‘2’ + Front ‘STOP’

push same timing during 5 seconds.

FLD ‘OP-0….

Move to appropriate position and

make changes with remote control

‘skip, mode, play’ key.

Press STOP key

FLD ‘write ok’

DETECT NEW EEPROM (OPTION EDIT SCREEN)

NAME

OPT0 OPT1 OPT2 OPT3 OPT4 OPT5 OPT6 OPT7 OPT8 OPT9

HEX

05 00 00 00 00 08 80 06 50 08

Remote control ‘Fwd skip’ +

Front ‘STOP’ push same timing

FLD ‘E2P CLR’

Completed

1-6

PROGRAM DOWNLOAD GUIDE

1. AUDIO PROGRAM

Download program file name must be RAT376.HEX

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage

device and disable the security software, then download the file to your set.

Caution: When downloading the file, you should neither unplug the USB device, change to the other

function, nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert USB device at USB function

READ

↓

FIRMWARE

↓

WRITE 00 .. 100

↓

UPDATED

↓

POWER OFF AUTOMATICALLY ← When completed, remove USB device.

1-7

2. CD PROGRAM

Download program file name must be HB001_DATE_00.BIN

If security program (Water Wall) is activated on your PC, you must save the file to the USB storage

device and disable the security software, then download the file to your set.

Caution: When downloading the file, you should neither unplug the usb device, change to the other

function, nor power off the device. USB device must be unplugged when the downloading process is completed.

ON VFD DISPLAY SCREEN

NO USB

↓← Insert usb device at USB function

READ

↓

FIRMWARE

↓

WRITE 00 .. 100

↓

FINISH

↓

POWER OFF AUTOMATICALLY ← When completed, remove USB device.

1-8

SPECIFICATIONS

• GENERAL

Power supply Refer to main label. Power consumption Refer to main label. Net Weight 3.4 kg External dimensions (W x H x D) 202 x 307 x 297.5 mm (without foot) BUS power supply (USB) DC 5 V 500 mA Operating conditions Temperature 5 °C ~ 35 °C (41 °F to 95 °F) Operation status: Horizontal Operating humidity 5 % ~ 90 % Laser Semiconductor laser, wavelength 650 nm

• INPUTS/OUTPUTS

Analog Audio In 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L,R)x 1

• TUNER FM / AM[MW]

FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz FM Intermediate Frequency 128 kHz AM Tuning Range 522 to 1 620 kHz, 520 to 1 710 kHz or 522 to 1 710 kHz AM Intermediate Frequency 45 kHz

• AMPLIFIER

Stereo mode 110 W + 110 W (4 Ω at 1 kHz, THD 10 %) Surround mode Front 110 W + 110 W (4 Ω at 1 kHz, THD 10 %) Subwoofer 150 W (3 Ω at 60 Hz, THD 10 %)

• CD

Frequency response 40 Hz - 20 kHz Signal-to-noise ratio 75 dB Dynamic range 80 dB

• SPEAKERS

Front speaker (RAS376BF) Passive subwoofer (RAS376BW) Type 2 Way 2 Speaker 1 Way 1 Speaker Impedance 4 Ω 3 Ω Rated Input Power 110 W 150 W Max. Input Power 220 W 300 W Net Dimensions (W x H x D) 232 x 360 x 265 mm 250 x 345 x 330 mm Net Weight (1EA) 3.15 kg 5.35 kg

1-9

MEMO

1-10

SECTION 2

CABINET & MAIN CHASSIS

CONTENTS

EXPLODED VIEWS ..................................................................................................................................... 2-3

1. CABINET AND MAIN FRAME SECTION (RAT376) ................................................................................ 2-3

2. MECHANISM DECK SECTION (CDM-345) ............................................................................................. 2-5

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

4. SPEAKER SECTION ................................................................................................................................ 2-8

2-1

MEMO

2-2

EXPLODED VIEWS

1. CABINET AND MAIN FRAME SECTION (RAT376)

460

260L

A42

A43

460

USB

FRONT

261

460

A26

CABLE2

460

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.

262

279

460

264

451

460

A47

SMPS

276

460

251

460

259

460

265

A44

MAIN

460

260R

A46

460

273 274

300

2-3 2-4

2. MECHANISM DECK SECTION (CDM-345)

MEMO

A26

01 2

43 1

01 2

6-25-2

3. PACKING ACCESSORY SECTION

824 AM Loop Antenna

801 Instruction Ass'y

808 Battery

804 Bag

825 FM Wire Antenna

900 Remote Control

803 Packing

2-7

802 Box

4. SPEAKER SECTION

4-1. FRONT SPEAKER (RAS376BF)

A60

2-8

4-2. PASSIVE SUBWOOFER (RAS376BW)

A90

2-9

MEMO

2-10

SECTION 3

ELECTRICAL

CONTENTS

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

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

2. NO BOOTING WHEN POWER ON THE SET ....................................................................................... 3-4

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET ..................................................................... 3-5

4. NO OPERATION OF MD ....................................................................................................................... 3-6

5. NO SOUND .......................................................................................................................................... 3-11

AUDIO ELECTRICAL TROUBLESHOOTING GUIDE .................................................................. 3-16

1. POWER (SMPS) ................................................................................................................................... 3-16

2. μ-COM PART CHECK .......................................................................................................................... 3-20

3. IC101(S24CS16A01) CHECK .............................................................................................................. 3-20

4. FLD DISPLAY CHECK ......................................................................................................................... 3-21

5. PWM MODULATION CHECK .............................................................................................................. 3-22

6. POWER AMP PART CHECK ............................................................................................................... 3-24

7. TUNER / AUX FUNCTION CHECK ...................................................................................................... 3-25

8. TUNER FUNCTION CHECK ................................................................................................................ 3-26

CDP ELECTRICAL TROUBLESHOOTING GUIDE ....................................................................... 3-27

1. CD FUNCTION ..................................................................................................................................... 3-27

2. USB FUNCTION ................................................................................................................................... 3-28

WAVEFORMS ............................................................................................................................................. 3-29

WIRING DIAGRAM ................................................................................................................................... 3-33

BLOCK DIAGRAMS ................................................................................................................................. 3-35

1. OVERALL BLOCK DIAGRAM .............................................................................................................. 3-35

2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-37

CIRCUIT DIAGRAMS ............................................................................................................................... 3-39

1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-39

2. MICOM & AD CIRCUIT DIAGRAM ...................................................................................................... 3-41

3. PWM & AMP CIRCUIT DIAGRAM ....................................................................................................... 3-43

4. CD DSP & SERVO CIRCUIT DIAGRAM ............................................................................................. 3-45

5. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-47

6. USB CIRCUIT DIAGRAM ..................................................................................................................... 3-49

CIRCUIT VOLTAGE CHART ................................................................................................................. 3-51

PRINTED CIRCUIT BOARD DIAGRAMS ......................................................................................... 3-55

1. MAIN P.C.BOARD ................................................................................................................................ 3-55

2. SMPS P.C.BOARD ............................................................................................................................... 3-59

3. FRONT P.C.BOARD ............................................................................................................................. 3-60

4. USB P.C.BOARD .................................................................................................................................. 3-61

3-1

ONE POINT REPAIR GUIDE

1. NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-1. FUSE & BRIDGE DIODE

1-1-1. Solution

Please check and replace F901, BD901, TH901 on SMPS board.

1-1-2. How to troubleshoot (Countermeasure)

1) Check if the fuse F901 is open or short-circuit.

2) Check if the bridge diode DB901 is short-circuit by over current with a digital multi meter.

3) Check if the NTC thermistor TH901 is normal or open.

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

< F901 >

If F901 is not short-circuit,

replace it with a same

speciﬁ cations one.

replace it with a new one.

< BD901 >

If BD901 is short-circuit,

< TH901 >

If TH901 is open,

replace it with a new one.

3-2

ONE POINT REPAIR GUIDE

NO POWER

If the unit doesn’t work by no power problem, repair the set according to the following guide.

1-2. D929

1-2-1. Solution

Please check and replace D929 on SMPS board.

1-2-2. How to troubleshoot (Countermeasure)

1) Check the Anode-Cathod Voltage of D929 with a digital multi-meter, it is normally 0.2 ~ 0.3 V.  If it doesn’t have any voltage, it’s destroyed. Replace it with a new one.

1-2-3. Service hint (Any picture / Remark)

< SMPS schematic diagram >

3-3

ONE POINT REPAIR GUIDE

2. NO BOOTING WHEN POWER ON THE SET

The set doesn’t work when press the power button on the front board or the remote control.

2-1. FLASH MEMORY

2-1-1. Solution

Please check and replace IC101 on MAIN board.

2-1-2. How to troubleshoot (Countermeasure)

1) Check 3.7 V to CN304 and CN105 in standby mode.  If there is no 3.7 V, check the SMPS.

2) Check 5.6 V, 12 V, F+, F- and PVDD when power on the set.

- If the set doesn’t work regardless of what the KEY1 changes high to low while pressing the power button X101 and X102 work normally but, if you can not power on the set, replace IC101 with a new one on the MAIN board.

2-1-3. Service hint (Any picture / Remark)

XWX

OZYU^]_ro¡P

rlX

O]WP

w~ yj{ys

OyXX`P

XWY

O`U_ZW[to¡P

pjXWY

< Signal check point >

3-4

ONE POINT REPAIR GUIDE

3. VFD IS NOT DISPLAYED WHEN POWER ON THE SET

When power on the set, any icons or characters on VFD are not displayed.

3-1. VFD

3-1-1. Solution

Please check and replace DIG502 on FRONT board.

3-1-2. How to troubleshoot (Countermeasure)

1) Check if VKK, FL+ and FL- are output from SMPS to VFD via the MAIN board.

2) Check if IC102 outputs VFD_D0, VFD_CLK and VFD_STB to the FRONT board.

3) Check the GR signal(pulse signal) of IC501 on the FRONT board. Check the SG signal(pulse signal) of IC501 on the FRONT board.

 If the GR and SG signal isn’t output, replace IC501 with a new one.  If the GR and SG signal is output, replace DIG502 with a new one.

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

nyG

znG

jGGSGGGGG GU

  GG GGU

nyG hGZWG

yZY^O{wZW[P

znG hGZWG

3-5

< Waveform of GR and SG signal >

ONE POINT REPAIR GUIDE

4. NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SPINDLE MOTOR among them.

4-1. SPINDLE MOTOR

4-1-1. Solution

Please check and replace IC301, IC302 on MAIN board.

4-1-2. How to troubleshoot (Countermeasure)

1) Check the SPDO signal from pin16 of IC302.  If no signal, check 3.3 V(RF) and X301.

2) Check the SPIN- & SPIN+ from IC301 to CN303 for driving SPINDLE motor. It is about 3.6 Vp-p.  If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN303 and MD.

4) Check the MD.  If the spindle motor is sort-circuit or has any trouble, it can not rotate CD discs. Please check the function after changing another MD.

4-1-3. Service hint (Any picture / Remark)

G ZU]} T

zwTGjuZWZ

zwRGGjuZWZ

< Waveform of SP- & SP+

for driving SPINDLE motor >

zwT

] GjuZWZ

pjZWX

zwR

\ GjuZWZ

< Signal check point >

3-6

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the SLED MOTOR among them.

4-2. SLED MOTOR

4-2-1. Solution

Please check and replace IC301, IC302 on MAIN board.

4-2-2. How to troubleshoot (Countermeasure)

1) Check the SLDO signal from Pin15 of IC302.  If no signal, check 3.3 V(RF) and X301.

2) Check the SLED+ & SLED- from IC301 to CN303 for driving SPINDLE motor. It is about 2.9 Vp-p.  If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN303 and MD.

4) Check the MD.  If the sled motor is sort-circuit or has any trouble, it can not move the pickup module. Please check the function after changing another MD.

4-2-3. Service hint (Any picture / Remark)

hG YU`} T

zsTGjuZWZ

zwT G ju[W\

zsRGGjuZWZ

zwRGGju[W\

< Waveform of SLED- & SLED+

for driving SLED motor >

zsR

Z GjuZWZ

pjZWX

zsT

[ GjuZWZ

< Signal check point >

3-7

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the servo motors in MD don’t work. This step is for checking the TRAY OPEN / CLOSE MOTOR among them.

4-3. TRAY OPEN / CLOSE MOTOR

4-3-1. Solution

Please check and replace IC301, IC302 on MAIN board.

4-3-2. How to troubleshoot (Countermeasure)

1) Check MOT_OPEN & MOT_CLOSE signals from Pin104, 105 of IC801 to IC301.  If no signal, check +1.8 V & + 5 V to IC301.

2) Check LOAD± from IC301 to CN303 for driving the tray open / close motor. It is about 3.85 Vp-p.  If no signal, check +5 V to IC301. If it has any trouble, replace it with a new one.

3) Check if the FFC cable is solidly connected between CN303 and MD.

4) Check the MD.  If the tray motor is sort-circuit or has any trouble, it can not open or close the tray. Please check the function after changing another MD.

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

hG ZU_\} T

tv{ vwlu

tv{ jsvzl svT GjuZWZ svRGGjuZWZ

< Waveform

for driving TRAY open / close motor >

tv{jsvzl ]GGpjZWX

tv{vwlu ^GGpjZWX

pjZWX

svT

[ GjuZWY

< Signal check point >

svR

\ GjuZWY

3-8

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER TRACKING ACTUATOR.

4-4. LASER TRACKING ACTUATOR

4-4-1. Solution

Please check and replace IC301, IC302 on MAIN board.

4-4-2. How to troubleshoot (Countermeasure)

The tracking actuator makes the laser beam be positioned in the center of a track on CD disc.

1) Check the TRD signal from Pin14 of IC302.  If no signal, check 3.3 V(RF) and X301.

2) Check TR- & TR+ from IC301 to CN301 for driving the tracking actuator.  If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN301 and MD.

4) Check the MD.  If the pickup module has any trouble, it can not move the laser beam on the left or right side. Please check the function after changing another MD.

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

{yTGjuZWX {yRGGjuZWX

< Waveform of TR±

for driving TRACKING actuator >

X\ GjuZWX

pjZWX

X[ GjuZWX

< Signal check point >

3-9

ONE POINT REPAIR GUIDE

NO OPERATION OF MD

When no sound output in the CD function, you can not listen to music reading data from a CD disc if the pickup module in MD doesn’t work. This step is for checking the LASER FOCUSING ACTUATOR.

4-5. LASER FOCUSING ACTUATOR

4-5-1. Solution

Please check and replace IC301, IC302 on MAIN board.

4-5-2. How to troubleshoot (Countermeasure)

The focusing actuator makes the laser beam keep a regular interval with the surface of a CD disc.

1) Check the FOD signal from Pin13 of IC302.  If no signal, check 3.3 V(RF) and X301.

2) Check F- & F+ from IC301 to CN301 for driving the focusing actuator.  If no signal, check +1.8 V and +5 V for IC301.

3) Check if the FFC cable is solidly connected between CN301 and MD.

4) Check the MD.  If the pickup module has any trouble, it can not move the laser beam on the top or bottom side. Please check the function after changing another MD.

4-5-3. Service hint (Any picture / Remark)

mRGGjuZWX

mTGjuZWX

< Waveform of TR±

for driving FOCUSING actuator >

XZ GjuZWX

pjZWX

X] GjuZWX

< Signal check point >

3-10

ONE POINT REPAIR GUIDE

5. NO SOUND

There is no sound output in the CD FUNCTION, repair the set according to the following guide.

5-1. IN THE CD FUNCTION

5-1-1. Solution

Please check and replace IC602, IC801 on MAIN board.

5-1-2. How to troubleshoot (Countermeasure)

1) Check CD_BCK, CD_LRCK, & CD_DATA signals from IC302 to IC801.  If no signal, check if the RF & servo signals from MD is entered to IC302. Refer to the “No operation of MD” guide on Item 4.

2) Check the following I2S signal flow. < I2S audio signal Interface >

- DAC_BCK: IC801_Pin87 --> IC602_Pin4

- DAC_LRCK : IC801_Pin88 --> IC602_Pin5 (44.1 kHz)

- DAC_DATA : IC801_Pin83 --> IC602_Pin6,9

- DAC_MCLK : IC801_Pin86 --> IC401_Pin44  If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

3) Check if “Digital audio AMP block” on Item 5-2 is normal.

5-1-3. Service hint (Any picture / Remark)

P/UP

DAC-BCK/LRCK/MCLK/DATA

< I2S Signal Flow >

BU9543KV

RF+ SERVO DSP

MLC9800

MCS LOGIC

PWM

PS9850

Or PS9851

khjtjsrGOX]U`Zto¡P khjijrGOXU[to¡ P khjkh{h khjsyjrGO[[UXro¡ P

< Waveform of I2S audio interface signals >

3-11

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output by DIGITAL AUDIO AMP DAMAGE, repair the set according to the following guide.

5-2. BY DIGITAL AUDIO AMP DAMAGE (IN ALL FUNCTIONS)

5-2-1. Solution

Please check and replace IC700, IC701(Only RAT376) on MAIN board.

5-2-2. How to troubleshoot (Countermeasure)

1) Check FL±, FR± & SW± signals from IC602 to IC700 & 701 each input function.  If no signal, check if I2S audio signals are entered to IC602. Refer to “I2S audio signal interface” on Item 5-1.

2) Check PVDD.  If PVDD is abnormal, check the SMPS.

3) Check +12 V for driving the gate of AMP IC. a. All the powers are normal, but if +12 V is low, there is possible for AMP IC to be damaged. b. Remove L711, L712, L713 and L714 one by one. When removed a inductance, if +12 V is recovered, AMP IC connected to it was damaged. c. Replace AMP IC with a new one.

4) Check the impedance between IC700/IC701_OUT-A/OUT-B & GND. a. If the impedance is 0 Ω, AMP IC must be damaged. b. After removing the heat sink, replace it with a new one.

5-2-3. Service hint (Any picture / Remark)

 

pj^WW

pj^WX

mySG ms

< Signal check point >

3-12

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the USB FUNCTION, repair the set according to the following guide.

5-3. IN THE USB FUNCTION

5-3-1. Solution

Please check and replace IC801 on MAIN board & IC505 on USB board.

5-3-2. How to troubleshoot (Countermeasure)

1) Check +5VU to USB board.  If the USB LED are turned on, the voltage is okay, if so not, check +5.6 V to pin4 of CN501.

2) Check USB D± from MAIN board to USB board. a. Check USB_DN/DP signals to IC801(pin116, 117). b. Check USB± signals from IC504 to CN501 (pin2, 3).  If there is any trouble, check the power for each IC. The power is normal but , if the signal waveform to the IC is distorted or no signal, replace it with a new one.

3) Check if “Digital audio AMP block” on item 5-2 is normal.

5-3-3. Service hint (Any picture / Remark)

USB CON

REG IC

D+/-

IC801

MLC9800

USB

P-CTRL

DAC_DAT A

DAC_L RCK

DAC_BC K

DAC_MCLK

IC602

PS9850

PWM

< USB function signal ﬂ ow >

AMP IC

TAS5612

kT GZ  Gju[WX

kRGGGY Gju[WX

< Waveform of USB D± signal >

3-13

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the AUX FUNCTION, repair the set according to the following guide.

5-4. IN THE AUX FUNCTION

5-4-1. Solution

Please check and replace IC401 on MAIN board.

5-4-2. How to troubleshoot (Countermeasure)

1) Check AUX_L/R signals to IC401 (Pin7, 8).

2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC801 to IC401.

3) Check if ADC_DATA is entered from IC401 to IC801.  If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it a new one.

4) Check the following I2S signal flow from IC801 to IC602. (Refer to Item 5-1.)  If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.  If AMP is damaged, replace it with a new one.

5-4-3. Service hint (Any picture / Remark)

AUX_ L/R

ADC_D ATADAC_MCLK

DAC_BCK

DAC_L RCK

DAC_DATA

DAC_MCLK

IC401

CS5346

IC801

MLC9800

< AUX function signal ﬂ ow >

AUX

IC602

PS9850

PWM

AMP IC

TAS5612

h kjk h{hGG Gy[W`

khjijr Gy[W_

khjsyjr Gy[W^

khjtjsr Gy[W]

h| sGGy[Y\ h|yGGy[Y[

< Signal check point >

3-14

ONE POINT REPAIR GUIDE

NO SOUND

There is no sound output in the TUNER FUNCTION, repair the set according to the following guide.

5-5. IN THE TUNER FUNCTION

5-5-1. Solution

Please check and replace IC401, TU100 on MAIN board.

5-5-2. How to troubleshoot (Countermeasure)

1) Check if TUNER_LR is entered from Pin1,3 of TU100 to IC401(Pin23, 24).

 If no signals, Check +3.3 V for Tuner power.  Check if the Tuner control signals (CLK, DAT, CE, RST, SLT) are entered from IC102 to TU100.

If it doesn’t work, replace TUNER with a new one.

2) Check if DAC_BCK, DAC_LRCK, & DAC_MCLK are entered from IC501 to IC202.

3) Check if ADC_DATA is entered from IC401 to IC801.  If no signal, check +5 V & +3.3 V(ADC) for IC401. If is NG, replace it a new one.

4) Check the following I2S audio signal flow from IC801 to IC602. (Refer to Item 5-1.)  If there is any trouble, check the power for each IC. The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a new one.

5) Check if the digital audio AMP block is okay. Refer to “Digital Audio AMP” guide on Item 5-2.  If AMP is damaged, replace it with a new one.

5-5-3. Service hint (Any picture / Remark)

IC401

CS5346

IC801

MLC9800

< TUNER IN function signal ﬂ ow >

TUNER _L/R

ADC_D ATADAC_MCLK

DAC_BCK

DAC_L RCK

DAC_DATA

DAC_MCLK

IC602

PS9850

PWM

TUNER

AMP IC

TAS5612

h kjk h{hGG Gy[W`

khjijr Gy[W_

khjsyjr Gy[W^

khjtjsr Gy[W]

< Signal check point >

{| uly y Gj[ZW

{| uly s  Gj[Y`

3-15

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

1. POWER (SMPS)

No 3.7 VA

YES

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

YES

Is BD901 normal? Replace BD901.

YES

Is TH901 normal? Replace TH901.

YES

Is Vcc

(10 V ~ 18 V) supplied to

IC901 Pin7?

Is D904 normal?

YES

Is D922 normal? Replace D922.

YES

Is there

about 2.5 V at

IC903 Pin1?

YES

Is D923 normal? Replace D923.

YES

Is D921 normal? Replace D921.

YES

Is D924 normal? Replace D924.

YES

Is D925 normal? Replace D925.

YES

Power line of I/O PCB is short.

Check or replace D904.

Replace IC903.

3-16

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No PVDD

YES

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

YES

Is BD901 normal? Replace BD901.

YES

Is TH901 normal? Replace TH901.

Is Vcc

(10 V ~ 18 V) supplied to

IC902 Pin7?

YES

Is D905 normal?

YES

Is Q910 base "H"?

YES

•

Check P-CTRL "H" signal from μ-COM. •

Check PC902.

Check or replace Q910.

Is Q902 normal? Replace Q902.

YES

Is D929 normal? Replace D929.

YES

Is there about 2.5 V

at IC904 Pin1?

Replace IC904.

Check or replace D905.

YES

Power line of main PCB is short.

3-17

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No 12 V

YES

Is Vcc

(15 V) supplied to Q953

collector?

YES

Is the

13 V Supplied to Q953

base?

YES

Check or replace Q953.

No 5 V

YES

Is Vcc

(6 V) supplied to IC951

Pin1?

Check or replace D921.

Check P-CTRL “H” signal

from μ-COM.

Check or replace D923.

YES

Check

IC951 Pin4 "H".

YES

Check or replace IC951.

Check P-CTRL

“H”’ signal from μ-COM.

3-18

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

No VFD

YES

Is D925 normal?

YES

Is ZD951 normal?

YES

Is Q951 normal?

YES

Check or replace VFD.

Check or replace D925.

Check or replace ZD951.

Check or replace Q951.

3-19

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

2. μ-COM PART CHECK

μ-COM PART

CHECK

YES

Check if

voltage of CN105 Pin10

is 3.7 VA.

YES

Check

both end voltage of

D102, D105.

YES

Check if IC102_Pin49 and

IC102_Pin36,59 are 3.5 V.

YES

X101:32.768kHz

X102:9.8304MHz

Check the operation.

YES

Refer to

SMPS troubleshooting.

Check if output of

D105(MBR0540) is 3.7 V.

Check D102, D105.

YES

NONO

Replace D102, D105.

3. IC101(S24CS16A01) CHECK

CHECK

IC102 PIN47,48

YES

Pin47: DATA

Pin48: CLK.

YES

OK OK

Check μ-COM

voltage 3.5 V.

YES

Check μ-COM.

YES

3-20

Refer to μ-COM troubleshooting.

Replace μ-COM.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

4. FLD DISPLAY CHECK

FLD DISPLAY CHECK

YES

Check

CN104 Pin1,2,3 input

voltage.

YES

Check if both end voltage

of F1,F2 are over 3.4 V

VKK : over 26 V.

YES

Check CN304

connection and power

Pin14,15,16(VKK,FL-,FL+),

Pin11(3.7 VA).

YES

Check

IC501(ET6315) voltage

Pin30 VKK:-26 V

Pin13, 43:+5 V.

Refer to SMPS troubleshooting.

Check CN304 connection.

YES

Check each Pin voltage.

YES

If voltage is Not 3.7 VA,

check input and output of D501.

YES

Check

IC102->IC501

data communication

Pin3->Pin9 STB Pin2->Pin7 DATA Pin4->Pin8 CLK

YES

FLD light on?

YES

Check IC501.

YES

Check output data IC102 Pin2.

Check input data

IC102 Pin2,3,4.

YES

Check IC102.

YES

3-21

Replace IC501.

Replace IC102.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

5. PWM MODULATION CHECK

PWM MODULATION PART CHECK

YES

Check

CN105 Pin10 3.7 VA.

YES

• Check IC602(PS9850) VDD 3.3 V (Pin16,24,29,32,35,40,48,61,64)

• Check VDD Core 1.2 V (Pin1,21,43,57,59,60)

• Check X602(19.2 MHz)

YES

Check

X602(19.2 MHz)

operation.

YES

Check

IC602(PS9850)

Pin51 CLK input.

SMPS troubleshooting.

Refer to

Check X602 (19.2 MHz).

YES

Replace X602(19.2 MHz).

YES

Check

IC102(LC87Fxx)

Pin41:PWM RESET

Pin45:PWM SDA

Pin46:PWM SCL

output.

YES

Check line

resistor output

RST: R636 / SCL: R637 /

SDA: R638.

YES

3-22

Replace R636,R637,R638.

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

YES

Check

IC602(PS9850)

input data Pin4, 5, 6

PWM wave.

YES

Check

PWM

modulator output FL: Pin31(+),30(-) FR: Pin28(+),27(-)

and others.

Check

CD Assy communication

Pin4, 5, 6.

YES

Check

IC602(PS9850) input

data.

YES

Check

IC602(PS9850).

YES

Refer to

CD troubleshooting.

Check each line

resistor output.

Replace

IC602(PS9850).

YES

3-23

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

6. POWER AMP PART CHECK

POWER AMP PART CHECK

YES

Check

CN105 Pin2: +12 V

Pin13,15: 29 V.

YES

Check IC700, IC701

Pin30,31,38,39,42,43,50,51 input voltage.

YES

Check each IC603 Pin64:+12 V input.

YES

Check PWM Modulator input

IC700 Pin4,5,10,11 / IC701 Pin4, 5.

YES

Check IC701, IC702

Pin28,29,36,37,43,44,52,53.

Refer to SMPS troubleshooting.

Check each line resistor output voltage.

YES

Check output

line coil.

YES

Replace the coil.

3-24

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

7. TUNER / AUX FUNCTION CHECK

FUNCTION CHECK

YES

Check IC401

(CS5346) Pin7,8,

23,24 input.

YES

Check IC401

(CS5346) Pin9 output

data.

YES

Check

IC801(MLC9800)

input data.

YES

IC501(MLC9800)

output data.

Check JK401,TU100.

Check IC401

Pin5: +5 V

Pin46: +3.3 V.

YES

Check IC401

Pin5: +5 V, Pin6: High,

Pin46: 3.3 V.

NONO

Check CN105 Pin7: +5 V

Pin9,10: +3.3 V.

Check IC401

Pin41: SDOUT,

Pin42: SLCK, Pin43: LRCK, Pin44: MCLK.

YES

3-25

AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE

8. TUNER FUNCTION CHECK

TUNER FUNCTION CHECK

YES

Check tuner

module(TU100)

operation.

YES

Check IC102 Pin21, 22, 23, 24, 25

data in/output.

YES

Refer to function check.

Check tuner module voltage

(Pin4: +3.3 V).

Check tuner module data.

3-26

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

1. CD FUNCTION

CD FUNCTION

YES

Can the

disc insert?

YES

Disc reading

is ok?

YES

Is no signal at spk?

YES

Check

the signal of

IC302 Pin34,35,36.

Is load +,- ok?

Is Motor ok? (about 12 Ω)

OPU driving (Focus and tracking) is ok?

Check Vcc of IC302.

YES

Is Motor_open/close

OK? (IC301 Pin10,11)

Check IC301.

Check loading motor.

Focus/

tracking/sled signal

Is the PD(CN301

Pin12) about 180mV?

YES

is ok?

YES

Check IC301

(Motor drive IC).

Check OPU

(pick-up).

YES

Check

the signal (16.0344 MHz)

of IC302

Pin31.

YES

Check IC801

input/output and

control line.

YES

Refer to function

check.

Check Cristal (X301).

Replace IC801.

3-27

Replace Cristal

(X301).

CDP ELECTRICAL TROUBLESHOOTIHG GUIDE

2. USB FUNCTION

USB FUNCTION

YES

Plug-in usb device.

YES

Display “NO USB”.

YES

Display “READ”.

YES

Display “NO FILE”.

YES

Check usb audio ﬁ le in usb device

(MP3, WMA ﬁ le is playable)

Check USB_5V.

YES

Check USB_D+/D-

(R501,R502).

YES

Check IC801(Pin116, 117).

NONO

Check CN401.

Check usb jack (JK501).

Replace IC801.

3-28

1. SDRAM

WAVEFORMS

2. SERVO

CLK

DATA

ADDRESS

IC802 Pin38

IC802 Pin53

IC802 Pin35

IC803 Pin1

IC801 Pin63

CD-16M

3-29

IC302 Pin61

IC302 Pin62

FOD

IC302 Pin13

3. AUDIO PATH

IC302 Pin63

IC801 Pin100

CD_BCK

3-30

CD_LRCK

CD_DATA

IC801 Pin102

IC801 Pin101

DAC_MCK

IC801 Pin86

DAC_BCK

IC801 Pin87

4. USB

USB_5V

DAC_LRCK

DAC_DATA

IC801 Pin88

IC801 Pin83

D+

D-

IC801 Pin116

IC801 Pin117

3-31

MEMO

3-32

WIRING DIAGRAM

(CDM-345)

CN901

CN902 CN903

6PIN

CN105

CN401

CN301

CN104

CN303

CN302

CN304

CN502

CN501

3-33 3-34

BLOCK DIAGRAMS

s,Ts

1. OVERALL BLOCK DIAGRAM

DECK MECHANISM

P/UP

SLED

SPINDLE

A,B,C,D,E,F

LOAD

AM5890S

MOTOR

FDO TDO

SLDO SPDO

OP/CL

16.93MHZ

BU9543KV

RF+ SERVO DSP

9543-RST;

DAC-MCLK

CD_DIN_DOUT

CD_MCK/ CD_R/W

CD-BCK/ LRCK/ DOUTA

BUSY; CD-16M

SUBSYQ;

DAC-BCK/LRCK/MCLK

DAC-DATA

SPI-DO/DI/CLK/ CS

12.288MHZ

PWM

PS9850

PWM-RST

PWM-CLK

FL+

FL-

FR+

AMP

TAS5612

FR-

PWM-DAT

SD; OTW

PDN

9.8304MHZ

EEPROM

DAT

CLK

SDRAM

EM638165TS-6G

FLASH

MX25LB005BMC

RESET; MU

OP/CL LI MIT

DSCK#,CKE,CS0#,RAS0#

DMA[0..11],DB[0..15]

A[0.. 18], DB[0..15]

RST, WEN#,CE#

12MHZ

MLC9800

MCS LOGIC

P-CTRL

USB CON

REG IC

I2S CLK

CS5346

ADC(6CH)

ADC-DATA

ADC-RST

ADC-DAT

ADC-CLK

DAT, CLK, RST, CE, INT

MICOM

LC87F5M64A

32.766khz

P-SENSE

STB

R/L

CLK

D+/-

VFD DRIVER

ET6315

RMC

+12V

POWER

AUX

TUNER

VFD

KEY

Standby LED

I/F

VOLUME LED

3.7V

3-35 3-36

2. SMPS BLOCK DIAGRAM

SMPS

ࣧ

Snubber

Block

Main

SMPS IC

Block

T R A N S

5V LDO

12V

Regulation

Block

On/Off

FL+

FL-

Vkk

5.6VA

12V

3.7VA

CN901

CN902/3

Noise

Filter

Block

(X-cap

Line Filter)

S E

Y-Cap

Snubber

AMP

SMPS IC

With FET

Block

Photo coupler

On/Off

Photo coupler

T R A N S

Feedback

CD P.CTL

P. C TL

PVDD

3-37 3-38

CIRCUIT DIAGRAMS

1. SMPS CIRCUIT DIAGRAM

IMPORTANT SAFETY NOTICE

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.

NOTE :

1. Shaded(

2. Voltages are DC-measured with a digital voltmeter

) parts are critical for safety.

Replace only with specified part number.

during Play mode.

CAUTION:

Danger if fuse is incorrectly replaced.

Replace only with the type identical to fuse rating

and(or) model name described in main label.

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

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

EBY60749101 Rev 7.1

SMPS

2010.11.09

3-39 3-40

2. MICOM & AD CIRCUIT DIAGRAM

EBY61070801(#1) Rev 1.9

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

µ-COM & AD

2010.11.09

3-41 3-42

3. PWM & AMP CIRCUIT DIAGRAM

EBY61070801(#2) Rev 1.9

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

PWM & AMP

2010.11.09

3-43 3-44

4. CD DSP & SERVO CIRCUIT DIAGRAM

7 69

10 12 11 17 18

: WAVEFORM NUMBER

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

CD DSP & SERVO

EBY61070801(#3) Rev 1.9

2010.11.09

3-45 3-46

5. FRONT CIRCUIT DIAGRAM

EBY61070901 Rev 2.2

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

FRONT

2010.11.09

3-47 3-48

6. USB CIRCUIT DIAGRAM

EBY61071001 Rev 1.5

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

USB

2010.11.09

3-49 3-50

CIRCUIT VOLTAGE CHART

1. SMPS Board

P.OFF(STANBY) P.ON (Unloaded) CD_PLAY (USB insert)

Location Cap Mode

3.7VA C923 330uF/16 3.70 40 3.70 200 3.70 220

5.0V(Main) C951 100uF/16 0 0 5.0 40 5.0 200

F+ - - -24 0 -19 132 -19.0 136

F- C952 - -24 0 -23.5 130 -23.5 130

VKK C926 47u/50 -26 10 -26.5 10 -26 10

12V C921 100/50 0 0 12 100 12 115

PVDD C932 1000/35 0 0 21.5 600 21.5 600

Voltage

(V)

Current

(mA)

Voltage

(V)

Current

(mA)

Voltage

(V)

2. MAIN Board

Location Pin No. Speciﬁ cation EE Mode (V) Margin Playback Mode (V) Margin

IC101 EEPROM (M24C16)

8 (VCC) 1.8~5.5 3.4 2.1 3.4 2.1

IC102 MICOM (LC87F5M64A)

9 (VDD2) 2.8~5.5 3.4 0.6 3.4 0.6

36 (VDD3) 2.8~5.5 3.4 0.6 3.4 0.6

59(VDD1) 2.8~5.5 3.4 0.6 3.4 0.6

IC301 MOTOR IC

8 (VCC1) 4.3~13.2 4.95 0.65 4.93 0.63

19 (VCC2) 4.3~Vcc1 4.95 0.65 4.93 0.63

IC302 SERVO (BU9543KV)

1 (AVDD1) 2.7~3.6 3.24 0.36 3.24 0.36

17 (DVDD) 2.7~3.6 3.24 0.36 3.24 0.36

33 (DVDD) 2.7~3.6 3.24 0.36 3.24 0.36

26 (VDD_CORE) 1.35~1.65 1.56 0.09 1.56 0.09

37 (VDD_CORE) 1.35~1.65 1.56 0.09 1.56 0.09

47 (DVDD) 2.7~3.6 3.24 0.36 3.24 0.36

53 (DVDD2) 2.7~3.6 3.24 0.36 3.24 0.36

58 (AVDD2) 2.7~3.6 3.24 0.36 3.24 0.36

IC401 ADC (CS5346)

5 (VLC) 3.13~5.25 4.94 0.31 4.94 0.31

14 (VA) 4.75~5.25 4.94 0.31 4.94 0.31

30 (VA) 4.75~5.25 4.94 0.31 4.94 0.31

36 (VLS) 3.13~5.25 3.24 2.01 3.24 2.01

46 (VD) 3.13~3.47 3.24 0.23 3.24 0.23

IC602 PWM (PS9850)

16 (VDD_IO) 2.97~3.63 3.23 0.4 3.23 0.4

21 (VDD_CORE) 1.08~1.32 1.24 0.08 1.24 0.08

24 (VDD_IO) 2.97~3.63 3.22 0.41 3.22 0.41

29 (VDD_IO) 2.97~3.63 3.22 0.41 3.22 0.41

32 (VDD_IO) 2.97~3.63 3.22 0.41 3.22 0.41

35 (VDD_IO) 2.97~3.63 3.24 0.39 3.24 0.39

40 (VDD_IO) 2.97~3.63 3.24 0.39 3.24 0.39

Current

(mA)

Location Pin No. Speciﬁ cation EE Mode (V) Margin Playback Mode (V) Margin

43 (VDD_CORE) 1.08~1.32 1.24 0.08 1.24 0.08

48 (VDD_IO) 2.97~3.63 3.22 0.41 3.22 0.41

57 (VDD_CORE) 1.08~1.32 1.24 0.08 1.24 0.08

59 (VDDA) 1.08~1.32 1.24 0.08 1.24 0.08

61 (VDD_VIN2) 2.20~3.30 3.22 0.08 3.22 0.08

64 (VDD_VIN1) 2.20~3.30 3.22 0.08 3.22 0.08

IC700 AMP (TAS5612)

56 (GVDD_B) 10.8~13.2 11.6 1.6 11.6 1.06

64 (VDD) 10.8~13.2 11.7 1.5 11.7 1.07

25 (GVDD_C) 10.8~13.2 11.7 1.03 11.7 1.06

26 (GVDD_D) 10.8~13.2 11.7 1.03 11.7 1.06

30 (PVDD_D) 0~34 21.5 12.1 21.5 12.1

31 (PVDD_D) 0~34 21.5 12.1 21.5 12.1

39 (PVDD_C) 0~34 21.5 12.1 21.5 12.1

42 (PVDD_B) 0~34 21.5 12.1 21.5 12.1

50 (PVDD_A) 0~34 21.5 12.1 21.5 12.1

51 (PVDD_A) 0~34 21.5 12.1 21.5 12.1

55 (GVDD_A) 10.8~13.2 11.7 1.03 11.7 1.06

IC801 (MLC9800)

2 (AVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

13 (VDD12) 1.08~1.32 1.2 0.12 1.1 0.22

30 (IOVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

47 (VDD12) 1.08~1.32 1.2 0.12 1.1 0.22

51 (IOVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

84 (IOVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

94 (VDD12) 1.08~1.32 1.2 0.12 1.2 0.12

113 (IOVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

115 (USBVDD33) 2.97~3.63 3.2 0.43 3.2 0.43

120 (PLL1VDD12) 1.08~1.32 1.2 0.12 1.2 0.12

122 (PLL3VDD12) 1.08~1.32 1.2 0.12 1.2 0.12

124 (PLL2VDD12) 1.08~1.32 1.2 0.12 1.2 0.12

IC802 SDRAM

1 (VDD) 3.0~3.6 3.2 0.4 3.26 0.34

3 (VDDQ) 3.0~3.6 3.2 0.4 3.26 0.34

9 (VDDQ) 3.0~3.6 3.2 0.4 3.26 0.34

14 (VDD) 3.0~3.6 3.2 0.4 3.26 0.34

27 (VDD) 3.0~3.6 3.2 0.4 3.26 0.34

43 (VDDQ) 3.0~3.6 3.2 0.4 3.26 0.34

49 (VDDQ) 3.0~3.6 3.2 0.4 3.26 0.34

IC803 Flash

8 (VDD) 2.7~3.6 3.2 0.4 3.2 0.4

3-51 3-52

MEMO

Location

No.

C118

C302 100uF 16V 0.22V 0V 0.22V 15.78V 3.31 0V 3.31 12.69V 3.26 0.03 3.23V 12.77V

C304 100uF 16V 0V 0V 0V 16V 1.65V 0V 1.65V 14.35V 1.64 0.03 1.61V 14.39V

C311 47uF 16V 0.22V 0.13V 0.09V 15.78V 3.17V 2.44V 0.73V 12.83V 3.1 2.37 0.73V 15.27V

C313 100nF 50V 0V 0V 0V 50V 4.97V 0V 4.97V 45.03V 4.92 0 4.92V 45.08V

C317 100uF 6.3V 0V 0V 0V 6.3V 1.57V 0V 1.57V 4.73V 1.57 0 1.57V 4.73V

C326 100uF 16V 0V 0V 0V 16V 4.97V 0V 4.97V 11.03V 4.92 0 4.92V 11.08V

C336 3.3uF 50V 0V 0V 0V 50V 1.65V 1.65V 0V 48.35V 1.65 1.64 0.01V 49.99V

C338 47uF 16V 0.22V 0V 0.22V 15.78V 3.31 0V 3.31 12.69V 3.25 0.03 3.22V 12.78V

C347 100uF 16V 0.11V 0V 0.11V 15.89V 1.65V 0V 1.65V 14.35V 1.64 0.03 1.61V 14.39V

C357 47uF 16V 0.22V 0V 0.22V 15.78V 3.31V 0V 3.31V 12.69V 3.25 0.03 3.22V 12.78V

C406 47uF 16V 0.22V 0V 0.22V 15.78V 3.31V 0V 3.31V 12.69V 3.26 0 3.26V 12.74V

C408 100uF 16V 0V 0V 0V 16V 2.49V 0V 2.49V 13.51V 0 0 0V 16V

C410 47uF 16V 0.24V 0V 0.24V 15.76V 4.97V 0V 4.97V 11.03V 3.65 0 3.65V 12.35V

C423 47uF 16V 0V 0V 0V 16V 4.02V 0V 4.02V 11.98V 1.41 0 1.41V 14.59V

C613 10uF 16V 0V 0V 0V 16V 1.25V 0V 1.25V 14.75V 1.24 0 1.24V 14.76V

C6A0 470uF 10V 0V 0V 0V 10V 1.25V 0V 1.25V 8.75V 1.24 0 1.24V 8.76V

C6A1 100pF 50V 0.18V 0V 0.18V 49.82V 1.65V 0V 1.65V 48.35V 3.25 0 3.25V 46.75V

C825 47uF 16V 0.2V 0V 0.2V 15.8V 3.31V 0V 3.31V 12.69V 3.26 0 3.26V 12.74V

C827 47uF 16V 0V 0V 0V 16V 1.19V 0V 1.19V 14.81V 1.18V 0V 1.18V 14.82V

C828 47uF 16V 0.2V 0V 0.2V 15.8V 3.31V 0V 3.31V 12.69V 3.26V 0V 3.26V 12.74V

C848 47uF 16V 0V 0V 0V 16V 1.19V 0V 1.19V 14.81V 1.18V 0V 1.18V 14.82V

C849 100nF 50V 0.22V 0V 0.22V 49.78V 3.32V 0V 3.32V 46.68V 3.26V 0V 3.26V 46.74V

C8F6 47uF 16V 0.2V 0V 0.2V 15.8V 3.31V 0V 3.31V 12.69V 3.26 0 3.26V 12.74V

C8F7 47uF 16V 0V 0V 0V 16V 1.19V 0V 1.19V 14.81V 1.18 0 1.18V 14.82V

Value

(uF)

1000uF

Spec (+) (-) Gap Margin (+) (-) Gap Margin (+) (-) Gap Margin

6.3V 3.5V 0V 3.5V 2.8V 3.44V 0V 3.44V 2.86V 3.39V 0V 3.39V 2.91V

EEMode Play back Rec voltage

3. FRONT Board

Location Pin No. Speciﬁ cation EE Mode (V) Margin Playback Mode (V) Margin

IC501 VFD (ET6315)

13 (VDD) 4.5~5.5 3.5 -1 3.48 -1.02

43 (VDD) 4.5~5.5 3.5 -1 3.48 -1.02

30 (VEE) VDD-35 -25.8 9.2 -25.5 9.5

Location No.

Value

(uF)

Spec

(+) (-) Gap

C510 47uF 16V 3.5V 0V 3.5V 12.5V 3.5V 0V 3.5V 12.5V 3.4V 0V 3.4V 12.6V

C514 47uF 35V 0V

C516 100uF 16V 3.6V 0V 3.6V 12.4V 3.6V 0V 3.6V 12.4V 3.6V 0V 3.6V 12.4V

C549 47uF 16V 6.2V 0V 6.2V 9.8V 6.1V 0V 6.1V 9.9V 5.7V 0V 5.7V 10.3V

C551 100uF 16V 5V 0V 5V 11V 5V 0V 5V 11V 5V 0V 5V 11V

EE Mode Playback Rec voltage

-25.9V

Margin

(+) (-) Gap

25.9V 9.1V 0V -25V 25V 10V 0V

Margin

(+) (-) Gap

-24.2V

24.2V 10.8V

Margin

3-53 3-54

PRINTED CIRCUIT BOARD DIAGRAMS

1. MAIN P.C.BOARD

(TOP VIEW)

3-55 3-56

Rev 2.2

MAIN P.C.BOARD

(BOTTOM VIEW)

EAX63554401 Rev 2.2

3-57 3-58

2. SMPS P.C.BOARD 3. FRONT P.C.BOARD

NOTE) Warning

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

Rev 6.2

3-59 3-60

4. USB P.C.BOARD

MEMO

3-61 3-62

MEMO MEMO

3-63 3-64

LG RAT376B Schematic

Specifications and Main Features

Frequently Asked Questions

User Manual