Internal Use Only

Website http://biz.lgservice.com

SERVICE MANUAL
Mini Hi-Fi System
SERVICE MANUAL
MODEL: RAD125 (RAS125F)

P/NO : AFN73250985 JANUARY, 2010 MODEL: RAD125 (RAS125F)

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 [CONTENTS]
SECTION 1. GENERAL
• SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
• ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
• SERVICE INFORMATION FOR EEPROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
• PROGRAM DOWNLOAD GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
• SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

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

• CABINET AND MAIN FRAME SECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• MECHANISM DECK SECTION (CDM-340) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
• SPEAKER SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

• PACKING ACCESSORY SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

SECTION 3. ELECTRICAL PART

• TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
• DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . . . . . . . . . . . . . . . 3-14
• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-18
• BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-19
• CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
• CIRCUIT VOLTAGE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-33

SECTION 4. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

1-1

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 SECTION 1. GENERAL
SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes

Storage in conductive bag Drop impact

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 cot-
ton swab should be used, taking care not to distort lens.

Pressure
Magnet
Pressure

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.

1-2

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 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 magne-
tism 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.

Armband

Resistor
(1 MΩ)
Resistor
Conductive
(1 MΩ)
Sheet

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

1-3

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 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.

1-4

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 SERVICE INFORMATION FOR EEPROM
POWER ON

FLD no disc status

Remote control ‘2’ + Front ‘STOP’ DETECT NEW EEPROM

push same timing during 5s (OPTION EDIT SCREEN)

NAME HEX

OPT 0 09
FLD ‘OP-0….
OPT 1 00
OPT 2 00
OPT 3 01
OPT 4 00
Move to appropriate position
OPT 5 68
and make changes
OPT 6 80
with Rmc ‘skip, mode, play’ key.
OPT 7 05
OPT 8 20
OPT 9 00

Press STOP key

FLD ‘write ok’

Remote control ‘Fwd skip’ +

Front ‘STOP’ push same timing

FLD ‘E2P CLR’

Completed

1-5

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 PROGRAM DOWNLOAD GUIDE
1. AUDIO PROGRAM
Download program file name must be RAD125.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.

1-6

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 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

↓
FINISH

↓
UPDATED

↓
POWER OFF AUTOMATICALLY ← When completed, remove usb device.

1-7

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 SPECIFICATIONS
• GENERAL
Power supply Refer to main label
Power consumption Refer to main label
Net Weight 3.5 kg
External dimensions (W x H x D) 202 x 307 x 278 mm
Bus Power Supply (USB) DC 5 V 500 mA
Operating conditions Temperature 5 °C ~ 35 °C,
Operation status: Horizontal
Operating humidity 5 % ~ 85 %
Laser Semiconductor laser, wavelength 650 nm

• TUNER FM/AM [MW]

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

• AMPLIFIER
Output Power 60 W + 60 W (4 Ω at 1 kHz, THD 10 %)

• CD
Frequency Response (40 ~ 20 000) Hz
Signal-to-noise ratio 75 dB
Dynamic range 80 dB

• SPEAKERS
Front Speaker
Type 2 Way 2 Speaker
Impedance 4Ω
Rated Input Power 60 W
Max. Input Power 120 W
Net Dimensions (W x H x D) 210 x 310 x 235 mm
Net Weight 2.6 kg

Designs and specifications are subject to change without prior notice

1-8

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 SECTION 2. EXPLODED VIEWS
• CABINET AND MAIN FRAME SECTION (RAD125) 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
460 LITERATURE.
261
460

262

264

460 451
260L
A47
F
C
FRONT

460
CABLE2 SMPS
A43

A
460
E
D
276
B
A42 USB
250 A26
255L
460 265
254 460
255R
256L 259
256R
253

G
257
D
258A 460
460

258B A44
252
A 460
251 B 260R
MAIN
A46

258C E
H
460 G 274
F

273 460
300
C

2-1 2-2

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 • MECHANISM DECK SECTION (CDM-340)

A26
A02 001
018
A01
002

439

014
013 020
003

017

015
012A
010
432
036
431 016
012

012A

019
432

026
012
A0 3 037

2-3 2-4

P : Non SVC Parts

S

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 • SPEAKER SECTION
1. FRONT SPEAKER (RAS125F)

A60

2-5

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 • PACKING ACCESSORY SECTION

910 Battery Cover 824 AM Loop Antenna

801 Instruction Ass'y 825 FM Wire Antenna

808 Battery
900 Remote Control

803 Packing

804 Bag

803 Packing

802 Box

2-6

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 SECTION 3. ELECTRICAL PART
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
1. POWER (SMPS)

No .3.7 VA
YES
NO
Is the F901 normal? Replace the F901 (Use the same Fuse)
YES
NO
Is the BD901 normal? Replace the BD901
YES
NO
Is the TH901(TH902) normal? Replace the TH901
YES
Is Vcc NO
(10 V ~ 18 V) supplied to Is the D904 normal?
IC901 Pin7?
NO

YES Check or Replace D904

NO
Is the D922 normal? Replace the D922
YES
Is there NO
about 2.5 V at Replace the IC903
IC903 Pin1?
YES
NO
Is the D923 normal? Replace the D923
YES
NO
Is the D921 normal? Replace the D921
YES
NO
Is the D924 normal? Replace the D924
YES
NO
Is the D925 normal? Replace the D925
YES

Power Line of I/O PCB is short

3-1

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 No .PVDD
YES
NO
Is the F901 normal? Replace the F901 (Use the same Fuse)
YES
NO
Is the BD901 normal? Replace the BD901
YES
NO
Is the TH901(TH902) normal? Replace the TH901

Is Vcc NO NO
(10 V ~ 18 V) supplied to Is the D905 normal?
IC902 Pin7?
YES
YES Check or Replace the D905

NO
Is the Q910 Base "H"?
YES
Check the power CTL "H" signal
from u-com or check PC902

Check or Replace the Q910

NO
Is the Q902 normal? Replace the Q902
YES
NO
Is the D929 normal? Replace the D929
YES

Is there about 2.5 V NO

at the IC904 Pin1? Replace the IC904

YES

Power Line of Main PCB is short

3-2

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 No 12 V

YES

Is Vcc NO
(15 V) supplied to Q953 Check or Replace the D921
Collector?

YES

Is the NO Check the ‘P.CTL “H” signal

13 V Supplied to Q953
Base? from μ-COM

YES

Check or Replace the Q953

No 5 V

YES

Is Vcc NO
(6 V) supplied to IC951 Check or Replace the D923
pin1?

YES

Is the NO Check the ‘PWR CTL

IC951 Pin4 “H”? “H”’ signal from μ-COM

YES

Check or Replace the IC951

3-3

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 No VFD

YES

NO
Is the D925 normal? Check or Replace the D925

YES

NO
Is the ZD951 normal? Check or Replace the ZD951

YES

NO
Is the Q951 normal? Check or Replace the Q951

YES

Check or Replace VFD

2. MICOM PART CHECK I

MICOM PART
CHECK I
YES
Check
P-SENS CN105 NO Refer to SMPS
pin9,10 Troubleshooting
(3.7 VA)

YES
Check
Check both NO NO NO
if input voltage of Check the periphery of Replace IC105
end voltage of IC105
IC101 is over IC105 (KIA7027) (KIA7027)
(KIA7027)
3.7 V
YES YES
Check voltage of Check if IC105 voltage is
IC102(LC87Fxxx) pin59,36 over 3.5 V
YES YES

OK OK

3-4

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 3. MIOM PART CHECK II
MICOM PART
CHECK II
YES

Check if NO
voltage of CN105 pin10 Refer to SMPS Troubleshooting
is 3.7 VA

YES

Check NO Check if output of

both end voltage of D105(MBR0540) is 3.7 V
D105, 102

YES
NO NO
Check if IC102_pin49 and Check D105, 102 Replace D105, 102
IC102_pin36,59 are 3.5 V

YES

X101:32.768KHz YES
X102:9.8304MHz
Check the operation

YES

OK OK

4. IC101(S24CS16A01)CHECK
CHECK
IC102 PIN47,48
YES

pin47: DATA NO Check MICOM NO

Refer to Micom Troubleshooting
pin48: CLK voltage 3.5 V

YES YES
NO
Check MICOM Replace MICOM

YES

OK OK

3-5

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 5. FLD DISPLAY CHECK

FLD DISPLAY CHECK

YES

Check NO
CN104 pin1,2,3 voltage Refer to SMPS
input

YES
Check if both end voltage of
F1,F2 are over 3.4 V
VKK : over 26 V
YES

Check CN304
connection and power NO
pin14,15,16(VKK,FL-,FL+), Check CN304 connection
pin11(3.7 VA)
YES

Check each
YES pin voltage

YES

OK
Check
IC501(ET6315) voltage NO If voltage is Not 3.7 VA,
pin30 VKK:-26 V check input and output of D501
pin13, 43:+5 V YES
NO
YES Check IC501 Replace IC501

YES
Check OK
IC102->IC501
data communication
pin pin NO IC102 : 2,3,4 pin
3pin->9pin STB check data Input
2pin->7pin DATA YES
4pin->8pin CLK
2pin data out
check data input
YES YES
NO
FLD light on? Check IC102 Replace IC102

YES YES

OK OK

3-6

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 6. PWM MODULATION CHECK

PWM MODULATION PART CHECK

YES

Check NO
CN105 pin10 3.7 VA Refer to SMPS Troubleshooting
CN106 pin3 3.3 VA

YES
Check IC602(PS9850) VDD pin voltage
(16,24,29,32,35,40,48,61,64) 3.3 V
Check VDD Core pin voltage (1,21,43,57,59,60) 1.2 V
and X602(19.2 MHz)
YES

Check NO NO
Check X602
X602(19.2 MHz) Replace X602(19.2 MHz)
(19.2 MHz)
operation

YES YES

IC602(PS9850)
pin55 CLK input OK
check

YES

Check
IC102(LC87Fxx) Check line
pin41:PWM REST NO resistor output NO
RST: R636 / SCL: R637 / Replace R636,R637,R638
pin45:PWM SDA
pin46:PWM SCL SDA: R638
output
YES
YES

OK

3-7

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 YES

Check
IC602(PS9850) Check
NO NO
data input CD Assy communication Refer to CD Troubleshooting
pin4, 5, 6 pin4, 5, 6
PWM wave
YES
YES
Check NO Check each line
IC602(PS9850) data
resistor output
input

YES

OK

Check
PWM
modulator output NO Check NO
FL: pin31(+),30(-) IC602(PS9850) Replace IC602(PS9850)
FR: pin28(+),27(-)
other output
check
YES

YES

OK OK

3-8

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 7. POWER AMP PART CHECK

POWER AMP PART CHECK

YES

Check NO
CN105 pin2: +12 V Refer to SMPS Troubleshooting
pin14,15: 20 V

YES

Check each IC603

pin27,26,32,35 input voltage

YES

Check each IC603 NO Check each line resistor

pin1,22,23,44:+12 V output voltage
input

YES

Check PWM Modulator input

each pin6,8,16,18

YES

Check IC603,
pin28,31,36,39 output

YES

Check output NO
Replace the coil
line coil

YES

OK

3-9

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 8. TUNER/AUX FUNCTION CHECK

FUNCTION CHECK

YES

Check IC401
NO
(CS5346) pin7,8, Check JK401,TU100
23,24 input

YES

Check IC401 NO Check IC401 NO Check CN105 pin7: +5 V

(CS5346) pin9 data pin46: +3.3 V
pin9,10: +3.3 V
output pin5: +5 V

YES YES

Check IC401
Check NO NO Check IC401
pin6: High
IC801(MLC9800) pin44:MCLK, 43: LRCK,
pin5: +5 V,
data input 42: SLCK, 41: SDOUT
pin46: 3.3 V
YES
YES
Replace IC401
IC501(MLC9800)
data output

YES

OK

3-10

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 9. TUNER FUNCTION CHECK

TUNER FUNCTION CHECK

YES

Check tuner NO Check tuner module voltage

module(TU100)
operation (pin4: +3.3 V)

YES

Check IC102 pin21, 22, 23, 24, 25

NO
data in/output Check tuner module data
YES

Refer to function check

3-11

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 CDP TROUBLESHOOTIHG GUIDE
1. CD FUNCTION

CD FUNCTION

YES

Can the NO NO Is MOT_open/close ok?

disc insert? Is load +,- ok? (IC301 pin10,11)
YES
YES YES
Check IC301

NO
Is motor ok?
Check loading motor
(about 12 Ω)

NO Focus/ NO
NO OPU driving (Focus Check IC301
Disc reading tracking/sled signal
is ok? and tracking) is ok? (Motor drive IC)
is ok?

YES YES
Is the PD(CN301 NO Check OPU
Is no signal at spk?
pin12) about 180mV? (pick-up)
YES

Is can’t
see the signal at NO
Check Vcc of IC302
pin 34,35,36 of
IC302?
YES

Is can’t see
the signal (16.0344 MHz) NO NO Replace Cristal
Check Cristal (X301)
at pin 31 of (X301)
IC302?
YES

Check IC801 NO
input/output and Replace IC801
control line

YES
Refer to function
check

3-12

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 2. USB FUNCTION

USB FUNCTION

YES

Plug-in usb device

YES

NO NO
Display “NO USB” Check usb_5V Check CN401

YES

YES

Check usb_D+/D- NO
Display “READ” Check usb jack (JK501)
(R501,R502)

YES
YES

NO
Display “NO FILE” Check IC801(pin116, 117) Replace IC801

YES

Check usb audio file in usb device

(MP3, WMA file is playable)

3-13

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 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING
1. FLASH/SDRAM

CLK

DATA

ADDRESS
3
RESET

2. SERVO

3-14

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 FE
6
TE
7

FOD
8

RF
9

3. AUDIO PATH

10

BCK

LRCK
11

DATA
12

3-15

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 13

BCK

LRCK
14

DATA
15

MCK

16

17 BCK

LRCK
18

19
DATA

3-16

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 20 USB_5V

21
D+

D-
22

3-17

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 AUX
SPK TERMINAL
JACK

SMPS PCB CD MD (CDM-340) TUNER

MODULE

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5PIN 16PIN 6PIN

3-18
MAIN + CD PCB

15PIN
WIRING DIAGRAM

6PIN

6PIN 16PIN

USB FRONT PCB

 16.93MHZ

A,B,C,D,E,F
D EC K M EC H ANISM L
PD B U 9543KV FL+
DAC-BCK/LRCK/MCLK
LD
RF+ SERVO D SP FL-
AMP
FDO
PWM TAS5342
DAC-DATA FR+
P/UP TDO PS9850 R
SLED ¡,F¡,T¡
SLDO FR-
SPDO

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SPIN D LE
M ¡ AU K
1. MAIN BLOCK DIAGRAM

9543-RST;
DAC-MCLK
LO AD

PWM-DAT
M O TO R

PWM-RST
PWM-CLK
¡ EEPRO M
IC

CD_DIN_DOUT
PDN

CD-BCK/ LRCK/ DOUTA

CD_MCK/ CD_R/W
SD; OTW

SUBSYQ; BUSY; CD-16M

9.8304MHZ
OP/CL
DAT
CLK

SPI-DO/DI/CLK/ CS
R ESET;M
U TE I2S CLK ADC-RST

3-19
OP/CL LI MIT M LC 9800 M IC O M
ADC-DAT
C S5346
M C S LO G IC AD C (6C H ) ADC-CLK LC 87F5M 64A
32.766khz

DSCK#,CKE,CS0#,RAS0
# DMA[0..11],DB[0..15]
SD RAM ADC-DATA
BLOCK DIAGRAMS

STB
CLK

12MHZ
DO

R/L
P-SENSE

R/L

VFD D RIVER

D+/-
ET6315

P-CTRL

RST, WEN#,CE#
KEY RMC
FLASH
DAT, CLK, RST, CE, INT

U SB C O N AUX TU NER VFD ¡ 12V POWER

I/F
3.7V
 SMPS
¡ ¡ On/Off FL+
Snubber
+ Block FL-
Vkk
CN 901
On/Off
¡ ¡ ¡
T 5V LDO 5V
R 5.6VA
Main A

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¡ SMPS IC N 12V 12V CN 902/3
Block S Regulation
2. SMPS BLOCK DIAGRAM

Block On/Off

¡ 3.7VA
¡

3-20
Noise Y-Cap Feedback
Filter
Photo coupler CD P.CTL
Block
(X-cap ¡ ¡ P.CTL
Y-Cap On/Off Photo coupler
Line Filter)

Snubber
¡
Block T
F R
U ¡
S A
E AMP N
¡ PVDD
SMPS IC S
With FET
Feedback
¡ Block
Photo coupler
 CIRCUIT DIAGRAMS IMPORTANT SAFETY NOTICE
WHEN SERVICING THIS CHASSIS, UNDER NO
COMPONENTS ARE SHADED ON THE SCHEMATIC
FOR EASY IDENTIFICATION.
THIS CIRCUIT DIAGRAM MAY OCCASIONALLY DIFFER
NOTE :
1. Shaded( ) parts are critical for safety.
Replace only with specified part number.
1. SMPS - POWER CIRCUIT DIAGRAM
CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter
MODIFIED OR ALTERED WITHOUT PERMISSION IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode.
FROM THE LG CORPORATION. ALL COMPONENTS PERFORMANCE IMPROVEMENT CHANGES INTO
SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL THE SET IS NOT DELAYED UNTIL THE NEW SERVICE
TO THOSE IN THE ORIGINAL CIRCUIT. SPECIAL LITERATURE IS PRINTED.

12

11

10

CAUTION:
1 Danger if fuse is incorrectly replaced.
Warning
Parts that are shaded are critical with
Replace only with the type identical to fuse rating
respect to risk of fire or electrical shock.
and(or) model name described in main label.

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

3-21 3-22

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 2. MAIN - MICOM CIRCUIT DIAGRAM

12

11

10

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

3-23 3-24

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 3. MAIN - CD DSP & SERVO CIRCUIT DIAGRAM

12

11

10

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

3-25 3-26

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 4. FRONT CIRCUIT DIAGRAM

12

11

10

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

3-27 3-28

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 5. USB CIRCUIT DIAGRAMS

12

11

10

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

3-29 3-30

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 CIRCUIT VOLTAGE CHART
Pin No. Spec. EE Mode (V) Margin Playback Mode (V) Margin Pin No. Spec. EE Mode (V) Margin Playback Mode (V) Margin
MAIN BOARD 124 (PLL2VDD12) 1.08~1.32 1.19 0.11 1.18 0.1
IC101 EEPROM (M24C16) IC802 SDRAM
8 (VCC) 1.8~5.5 3.38 2.12 3.38 2.12 1 (VDD) 3.0~3.6 3.34 0.26 3.26 0.24
IC102 MICOM (LC87F5M64A) 3 (VDDQ) 3.0~3.6 3.34 0.26 3.26 0.24
9 (VDD2) 2.8~5.5 3.38 0.58 3.38 0.58 9 (VDDQ) 3.0~3.6 3.34 0.26 3.26 0.24
36 (VDD3) 2.8~5.5 3.38 0.58 3.38 0.58 14 (VDD) 3.0~3.6 3.34 0.26 3.26 0.24
59 (VDD1) 2.8~5.5 3.38 0.58 3.38 0.58 27 (VDD) 3.0~3.6 3.34 0.26 3.26 0.24
IC301 MOTOR IC 43 (VDDQ) 3.0~3.6 3.34 0.26 3.26 0.24
8 (VCC1) 4.3~13.2 4.94 0.64 4.91 0.61 49 (VDDQ) 3.0~3.6 3.34 0.26 3.26 0.24
19 (VCC2) 4.3~Vcc1 4.94 0 4.91 0 IC803 Flash
IC302 SERVER (BU9543KV) 8 (VDD) 2.7~3.6 3.26 0.34 3.25 0.35
1 (AVDD1) 2.7~3.6 3.34 0.26 3.25 0.35 FRONT BOARD
17 (DVDD) 2.7~3.6 3.34 0.26 3.25 0.35 IC501 VFD (ET16315)
33 (DVDD) 2.7~3.6 3.34 0.26 3.25 0.35 13 (VDD) 4.5~5.5 3.42 -1.08 3.42 -1.08
26 (VDD_CORE) 1.35~1.65 1.56 0.09 1.56 0.09 30 (VEE) VDD-35 -24.8 6.78 -24.3 7.28
37 (VDD_CORE) 1.35~1.65 1.56 0.09 1.56 0.09 43 (VDD) 4.5~5.5 3.42 -1.08 3.42 -1.08
47 (DVDD) 2.7~3.6 3.34 0.26 3.25 0.35
53 (DVDD2) 2.7~3.6 3.34 0.26 3.25 0.35
Value EE Mode Playback Rec. Voltage
58 (AVDD2) 2.7~3.6 3.34 0.26 3.25 0.35 Volt-
Ca- Posi- Posi-
IC401 ADC (CS5346) Loca No.
pacitor
age Posi- Nega-
Gap Margin tive
Nega-
Gap Margin tive
Nega-
Gap Margin
5 (VLC) 3.13~5.25 4.93 0.32 4.93 0.32 Spec. tive (+) tive (-) tive (-) tive (-)
(uF) (+) (+)
14 (VA) 4.75~5.25 4.93 0.32 4.93 0.32
30 (VA) 4.75~5.25 4.93 0.32 4.93 0.32
MAIN BOARD
C118 1000uF 6.3V 3.39V 0V 3.39V 2.91V 3.38V 0V 3.38V 2.92V 3.39V 0V 3.39V 2.91V
36 (VLS) 3.13~5.25 3.26 0.13 3.25 0.12
C302 100uF 16V 3.26V 0.01V 3.25V 12.75V 3.25 0.03 3.22V 12.78V 3.26 0.03 3.23V 12.77V
46 (VD) 3.13~3.47 3.26 0.13 3.25 0.12
C304 100uF 16V 1.63V 0.01V 1.62V 14.38V 1.64V 0.03V 1.61V 14.39V 1.64 0.03 1.61V 14.39V
IC602 PWM (PS9850) C311 47uF 16V 3.26V 2.8V 0.46V 15.54V 3.1V 2.37V 0.73V 15.27V 3.1 2.37 0.73V 15.27V
16 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C313 100nF 50V 4.95V 0V 4.95V 45.05V 4.92V 0V 4.92V 45.08V 4.92 0 4.92V 45.08V
21 (VDD_CORE) 1.08~1.32 1.25 0.07 1.25 0.07
C317 100uF 6.3V 1.55V 0V 1.55V 4.75V 1.56V 0V 1.56V 4.74V 1.57 0 1.57V 4.73V
24 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C326 100uF 16V 4.95V 0V 4.95V 11.05V 4.92V 0V 4.92V 11.08V 4.92 0 4.92V 11.08V
29 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C336 3.3uF 50V 1.63V 1.63V 0V 50V 1.65V 1.64V 0.01V 49.99V 1.65 1.64 0.01V 49.99V
32 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C338 47uF 16V 3.26V 0.01V 3.25V 12.75V 3.25 0.03 3.22V 12.78V 3.25 0.03 3.22V 12.78V
35 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C347 100uF 16V 1.63V 0.01V 1.62V 14.38V 1.64V 0.03V 1.61V 14.39V 1.64 0.03 1.61V 14.39V
40 (VDD_IO) 2.97~3.63 3.24 0.33 3.24 0.33
C357 47uF 16V 3.26V 0.01V 3.25V 12.75V 3.25V 0.03V 3.22V 12.78V 3.25 0.03 3.22V 12.78V
43 (VDD_CORE) 1.08~1.32 1.25 0.07 1.25 0.07
C403 47uF 16V 4.95V 0V 4.95V 11.05V 4.95V 0V 4.95V 11.05V 4.95 0 4.95V 11.05V
48 (VDD_IO) 2.97~3.63 3.24 0.27 3.24 0.27
C406 47uF 16V 3.26V 0V 3.26V 12.74V 3.26V 0V 3.26V 12.74V 3.26 0 3.26V 12.74V
57 (VDD_CORE) 1.08~1.32 1.25 0.07 1.25 0.07
C408 100uF 16V 0V 0V 0V 16V 0V 0V 0V 16V 0 0 0V 16V
59 (VDDA) 1.08~1.32 1.25 0.07 1.25 0.07
C410 47uF 16V 3V 0V 3V 13V 3.82V 0V 3.82V 12.18V 3.65 0 3.65V 12.35V
61 (VDD_VIN2) 2.20~3.30 3.24 0.06 3.24 0.06
C423 47uF 16V 1.41V 0V 1.41V 14.59V 1.41V 0V 1.41V 14.59V 1.41 0 1.41V 14.59V
64 (VDD_VIN1) 2.20~3.30 3.24 0.06 3.24 0.06
C613 10uF 16V 1.25V 0V 1.25V 14.75V 1.24V 0V 1.24V 14.76V 1.24 0 1.24V 14.76V
IC603 AMP (TAS5342) C664 47uF 25V 12.19V 0V 12.19V 12.81V 12.15V 0V 12.15V 12.85V 12.16 0 12.16V 12.84V
1 (GVDD_B) 10.8~13.2 12.17 1.03 12.14 1.06 C665 10uF 50V 12.18V 0V 12.18V 37.82V 12.14V 0V 12.14V 37.86V 12.14 0 12.14V 37.86V
21 (VDD) 10.8~13.2 12.16 1.04 12.13 1.07 C690 470uF 50V 21.9V 0V 21.9V 28.1V 21.9V 0V 21.9V 28.1V 21.9 0 21.9V 28.1V
22 (GVDD_C) 10.8~13.2 12.17 1.03 12.14 1.06 C691 470uF 50V 21.9V 0V 21.9V 28.1V 21.9V 0V 21.9V 28.1V 21.9 0 21.9V 28.1V
23 (GVDD_D) 10.8~13.2 12.17 1.03 12.14 1.06 C6A0 470uF 10V 1.25V 0V 1.25V 8.75V 1.24V 0V 1.24V 8.76V 1.24 0 1.24V 8.76V
26 (PVDD_D) 0~34 21.9 12.1 21.9 12.1 C6A1 100pF 50V 3.26V 0V 3.26V 46.74V 3.25V 0V 3.25V 46.75V 3.25 0 3.25V 46.75V
27 (PVDD_D) 0~34 21.9 12.1 21.9 12.1 C6A4 1000uF 6.3V 3.26V 0V 3.26V 3.04V 3.26V 0V 3.26V 3.04V 3.26 0 3.26V 3.04V
32 (PVDD_C) 0~34 21.9 12.1 21.9 12.1 C825 47uF 16V 3.26V 0V 3.26V 12.74V 3.26V 0V 3.26V 12.74V 3.26 0 3.26V 12.74V
35 (PVDD_B) 0~34 21.9 12.1 21.9 12.1 C827 47uF 16V 1.18V 0V 1.18V 14.82V 1.18V 0V 1.18V 14.82V 1.18V 0V 1.18V 14.82V
40 (PVDD_A) 0~34 21.9 12.1 21.9 12.1 C828 47uF 16V 3.26V 0V 3.26V 12.74V 3.26V 0V 3.26V 12.74V 3.26V 0V 3.26V 12.74V
41 (PVDD_A) 0~34 21.9 12.1 21.9 12.1 C848 47uF 16V 1.18V 0V 1.18V 14.82V 1.18V 0V 1.18V 14.82V 1.18V 0V 1.18V 14.82V
44 (GVDD_A) 10.8~13.2 12.17 1.03 12.14 1.06 C849 100nF 50V 3.27V 0V 3.27V 46.73V 3.26V 0V 3.26V 46.74V 3.26V 0V 3.26V 46.74V
IC801 (MLC9800) C8F6 47uF 16V 3.26V 0V 3.26V 12.74V 3.26V 0V 3.26V 12.74V 3.26 0 3.26V 12.74V
2 (AVDD33) 2.97~3.63 3.35 0.08 3.26 0.07 C8F7 47uF 16V 1.18V 0V 1.18V 14.82V 1.18V 0V 1.18V 14.82V 1.18 0 1.18V 14.82V
13 (VDD12) 1.08~1.32 1.19 0.11 1.18 0.1
FRONT BOARD
30 (IOVDD33) 2.97~3.63 3.35 0.08 3.26 0.07
C510 47uF 16V 3.4V 0V 3.4V 12.6V 3.4V 0V 3.4V 12.6V 3.4V 0V 3.4V 12.6V
47 (VDD12) 1.08~1.32 1.19 0.11 1.18 0.1
C514 47uF 35V 0V -25.7V 25.7V 9.3V 0V -24.9V 24.9V 10.1V 0V -24.2V 24.2V 10.8V
51 (IOVDD33) 2.97~3.63 3.35 0.08 3.26 0.07
C516 100uF 16V 3.6V 0V 3.6V 12.4V 3.6V 0V 3.6V 12.4V 3.6V 0V 3.6V 12.4V
84 (IOVDD33) 2.97~3.63 3.35 0.08 3.26 0.07
C549 47uF 16V 6.1V 0V 6.1V 9.9V 5.8V 0V 5.8V 10.2V 5.7V 0V 5.7V 10.3V
94 (VDD12) 1.08~1.32 1.19 0.11 1.18 0.1
C551 100uF 16V 5V 0V 5V 11V 5V 0V 5V 11V 5V 0V 5V 11V
113 (IOVDD33) 2.97~3.63 3.35 0.08 3.26 0.07
115 (USBVDD33) 2.97~3.63 3.35 0.08 3.26 0.07
120 (PLL1VDD12) 1.08~1.32 1.19 0.11 1.18 0.1
122 (PLL3VDD12) 1.08~1.32 1.19 0.11 1.18 0.1

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 PRINTED CIRCUIT BOARD DIARGAMS
1. MAIN P.C. BOARD DIAGRAM ( TOP VIEW )

3-33 3-34

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 MAIN P.C. BOARD DIAGRAM ( BOTTOM VIEW )

3-35 3-36

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 2. SMPS P.C. BOARD DIAGRAM ( TOP VIEW )

3-37 3-38

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 SMPS P.C. BOARD DIAGRAM ( BOTTOM VIEW ) Warning
Parts that are shaded are critical with
respect to risk of fire or electrical shock.

3-39 3-40

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 3. FRONT & USB P.C. BOARD DIAGRAM ( TOP VIEW )

3-41 3-42

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 FRONT & USB P.C. BOARD DIAGRAM ( BOTTOM VIEW )

3-43 3-44

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