LG MICRO Hi-Fi SYSTEM, RBD154, RBS154V Service Manual
MODEL: RBD154 (RBS154V)
SERVICE MANUAL
P/NO : AFN72956676 APRIL, 2009
MODEL: RBD154 (RBS154V)
Website http://biz.lgservice.com
Internal Use Only
MICRO Hi-Fi SYSTEM
SERVICE MANUAL
1-1
[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
• CABINET AND MAIN FRAME SECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
• DECK MECHANISM EXPLODED VIEW (DP-12AV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . 3-17
• WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21
• BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22
• CIRCUIT DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-25
• CIRCUIT VOLTAGE CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-51
• PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-55
❍ SECTION 4. MECHANISM (DP-12AV) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
❍ SECTION 5. REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
1-2
SERVICING PRECAUTIONS
NOTES REGARDING HANDLING OF THE PICK-UP
1. Notes for transport and storage
1) The pick-up should always be left in its conductive bag until immediately prior to use.
2) The pick-up should never be subjected to external pressure or impact.
2. Repair notes
1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials.
2) The pick-up should always be handled correctly and carefully, taking care to avoid external pressure and
impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or
damage to the printed-circuit board.
3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason
the adjustment point and installation screws should absolutely never be touched.
4) Laser beams may damage the eyes!
Absolutely never permit laser beams to enter the eyes!
Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged.
5) Cleaning the lens surface
If there is dust on the lens surface, the dust should be cleaned away by using an air bush (such as used
for camera lens). The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort lens.
6) Never attempt to disassemble the pick-up.
Spring has excess pressure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab.
(Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much
of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up.
Storage in conductive bag
Drop impact
NEVER look directly at the laser beam, and don’t allow
contact with fingers or other exposed skin.
Magnet
How to hold the pick-up
Conductive Sheet
Cotton swab
Pressure
Pressure
SECTION 1. GENERAL
1-3
NOTES REGARDING COMPACT DISC PLAYER REPAIRS
1. Preparations
1) Compact disc players incorporate a great many ICs as well as the pick-up (laser diode). These components
are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components
can be damaged, and for that reason components should be handled with care.
2) The pick-up is composed of many optical components and other high-precision components. Care must be
taken, therefore, to avoid repair or storage where the temperature or humidity is high, where strong magnetism is present, or where there is excessive dust.
2. Notes for repair
1) Before replacing a component part, first disconnect the power supply lead wire from the unit
2) All equipment, measuring instruments and tools must be grounded.
3) The workbench should be covered with a conductive sheet and grounded.
When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is
because there is the possibility of damage by static electricity.)
4) To prevent AC leakage, the metal part of the soldering iron should be grounded.
5) Workers should be grounded by an armband (1M Ω)
6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to prevent
static electricity changes in the clothing to escape from the armband.
7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin.
Resistor
(1 M Ω
Conductive
Sheet
Resistor
(1 M Ω)
Armband
1-4
ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components
commonly are called Electrostatically Sensitive Devices (ESD). Examples of typical ESD devices are integrated
circuits and some field-effect transistors and semiconductor chip components. The following techniques should
be used to help reduce the incidence of component damage caused by static electricity.
1. Immediately before handling any semiconductor component or semiconductor-equipped assembly, drain off
any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a
commercially available discharging wrist strap device, which should be removed for potential shock reasons
prior to applying power to the unit under test.
2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive surface
such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices.
4 . Use only an anti-static solder removal device. Some solder removal devices not classified as "anti-static"
can generate electrical charges sufficient to damage ESD devices.
5. Do not use freon-propelled chemicals. These can generate electrical charges sufficient to damage ESD
devices.
6. Do not remove a replacement ESD device from its protective package until immediately before you are
ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by
conductive foam, aluminum foil or comparable conductive materials).
7. Immediately before removing the protective material from the leads of a replacement ESD device, touch the
protective material to the chassis or circuit assembly into which the device will by installed.
CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER
SAFETY PRECAUTIONS.
8. Minimize bodily motions when handing unpackaged replacement ESD devices. (Otherwise harmless motion
such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can generate
static electricity sufficient to damage an ESD device).
CAUTION. GRAPHIC SYMBOLS
THE LIGHTNING FLASH WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS
INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED
“DANGEROUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF
ELECTRIC SHOCK.
THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALERT THE
SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE
LITERATURE.
1-5
SERVICE INFORMATION FOR EEPROM
POWER ON
FLD no disc status
Remote control
“pause →1→4→7→2”
FLD ‘OP-0….
Move to appropriate position
and make changes
with Rmc ‘cursor,number’ key.
Press Enter key
FLD ‘write ok’
Remote control ‘Pause’
FLD ‘E2P CLR’
(Set “stop” + Rmc “0”)
Completed
NAME
OPT 0
OPT 1
OPT 2
OPT 3
OPT 4
OPT 5
OPT 6
OPT 7
OPT 8
OPT 9
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
HEX
F9
00
B4
DD
00
11
A0
00
30
00
Factory Reset
Rmc “1→3→9→7→1→3→9→ enter”
1-6
PROGRAM DOWNLOAD GUIDE
1. AUDIO PROGRAM
Download program file name must be RBD154.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. DVD 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.
1-8
SPECIFICATIONS
GENERAL
Power supply Refer to main label.
Power consumption Refer to main label.
Net Weight 3.8 kg
External dimensions (W x H x D) 202 x 307 x 262 mm
Operating conditions Temperature 5°C to 35°C, Operation status: Horizontal
Operating humidity 5% to 85%
Laser Semiconductor laser, wavelength 650 nm
Tuner FM
FM Tuning Range 87.5 ~ 108.0 MHz or 87.50 ~ 108.0 MHz
FM Intermediate Frequency 128 kHz
AM Tuning Range (optional) 522 ~ 1,620 kHz or 520 ~ 1,710 kHz or 520 ~ 1,710 kHz
AM Intermediate Frequency 45 kHz
AMPLIFIER
Output Power 80 W + 80 W
T.H.D 0.5 %
SPEAKERS (RBS154V)
Type 2 Way 2 Speaker
Impedance 4 Ω
Rated Input Power 50 W
Max. Input Power 100 W
Net Dimensions (W x H x D) 165 x 316 x 198 mm
Net Weight 2.8 kg
Designs and specifications are subject to change without notice.
I
F
D
I
C
E
G
H
G
L
465
251
264
451
276
263
465
265
300
273
A44
257
463
465
463
C
256
465
A45
K
K
M
N
261
258
259
A41
M
N
KARAOKE
USB
SCART
H
480
MIC
465
CABLE4
252
253
254
465
255
465
250
A42
A43
CABLE3
463
B
F
E
D
463
266
277
MAIN
B
CABLE2
CABLE1
SMPS
A47
465
465
465
274
262
465
A46
OPTIONAL PART
SECTION 2. EXPLODED VIEWS
• CABINET AND MAIN FRAME SECTION (RBD154)
2-1 2-2
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.
A42 ASSY INCLUDES TOUCH PCB
2-3 2-4
• DECK MECHANISM EXPLODED VIEW (DP-12AV)
012
010
012
037
012A
019
442
442
A02
A01
A03
001
002
003
439
018
013
017
014
020
016
440
015
015B
015A
435
026
2-5
655
655
651
652
653
654
A61B
656
657
654
654
658
659
662
661
A61A
660
A60
• SPEAKER SECTION
1. FRONT/REAR SPEAKER (RBS154V)
2-6
• PACKING ACCESSORY SECTION
825 FM Wire Antenna
900 Remote Control
808 Battery
801 Instruction Ass'y
803 Packing
802 Box
804 Bag
811 Plug Ass'y, 1Way
827 Micro Phone
832 Disc
3-1
1. POWER (SMPS)
NO
Replace the fuse
YES
Check the fuse
F901
NO
Check BD901, LF901, 902
NO
Check short of P9702 line
Check short of P9701, P9702 line
NO
Check short of P9701 line
NO
Replace IC901, 902
YES
Check
the DC V of C905
if DC V is over
400V
NO
YES
Check the
DC V of C909,C903,C921
If DC V is in 14~19V
and it is steady
Check IC901, 902
YES
YES
Check the
DC V of C981,C945.
If DC V is 6.1V
YES
Check the
DC V of C950,C951
If DC V is in
26V
YES
OK
POWER (SMPS)
SECTION 3. ELECTRICAL PART
AUDIO ELECTRICAL TROUBLESHOOTIHG GUIDE
3-2
2. P-SEN 3. VKK PART CHECK
Check power circuit
troubleshooting
NO
YES
P-SENS
Check
the pin6 of P9702
if DC V is over
5.6V
YES
OK
Check power circuit
troubleshooting.
NO
YES
VKK CHECK
Check
the pin3 of P9702
if DC V is over
32V ±1
YES
OK
4. MICOM PART CHECK I
OK OK
NO
Replace the
related parts
NO
Check if output voltage
of IC101 KIA7042 is
4.3V
YES
YES
YES YES
YES YES
Check IC100
LC87F5NC8A 4pin
power
YES
Refer to SMPS
troubleshooting
MICOM PART
CHECK I
NO
Check
P7904 6pin
P-SENS
NO
Check
power of both
terminals of IC101
KIA7042
Check if
IC101 KIA7042
input is over 5V
Check the
related part of IC101
KIA7042
3-3
5. MICOM PART CHECK II
YES
NO
Refer to SMPS
troubleshooting
Check D101 RS1G
output is working on 5V
YES
Check IC100
14, 55, 89pin 5V
YES
YES
OK
YES
Check the related part
Replace the related parts
YES
Check the working condition
X101:32.768kHz
X100:9.8304MHz
Check P7904 5pin 5.6V
YES
NO
Check power
of both terminals of D101
RS1G
YES
NO
Check IC102
KIA7027 3pin 4V
Check the related part
MICOM PART CHECK II
NO
NO
Replace the related parts
Check IC102 1pin high
NO
Check output power of IC101
KIA7042 is over 4.3V
YES
OK
YES
OK
3-4
6. IC103 S-24CS16A01 PART CHECK
YES
YES
YES
YES
93pin DATA 94pin CLK
Check the related part
NO
Check MICOM power 5V
CHECK IC100 LC87F5NC8A
93, 94 PIN
NO
Replace the related parts
NO
Refer to micom
troubleshooting
OK OK
3-5
7. FLD DISPLAY PART CHECK
YES
YES
YES
YES
NO
Refer to SMPS
troubleshooting
F1+,F2-both terminals:over 4.4V
Check power VKK:over -32V
YES
FLT light on?
Check
P7904 1,2,3 power
YES
Check
P7904 connection
condition and power F1+,F2-
both terminals:over 4.4V
check power VKK:over 32V
check 5
pin
:5.6V
YES
Check
IC301 PT6302
power 48pin VKK:-32V
57pin +5V
IC100
check→IC301
data communication
pin pin
26pin→55pin DO
28pin→54pin CLK
27pin→53pin STB
5pin→52pin RST
OK
OK
NO
Replace the related part
Check P7904 assembly
YES
YES
Check
power of each pin
OK
NO
NO
NO
NO
Replace the related part
IC100 27pin→STB
28pin→CLK
check data output
Check 26 PIN→DO→DATA input
YES
YES
Check the related part
NO
Replace the related part
When 5V fails,check D303 SR35
input and output power
YES
YES
Check the related part
OK
YES
FLD DISPLAY CHECK
3-6
8. TOUCH-PAD PART CHECK
NO
NO
YES
YES
PN352 1pin 5V
NO
Replace the related part
NO
Refer to SMPS
troubleshooting
Check resistance output of
line CLK:R128 DATA:R126
IC305
28pin check 5V
Check
IC305 13pin, 11pin,
IC100 96pin:CLK,
95pin:DATA
TOUCH-PAD CHECK
YES
OK
YES
OK
YES
OK
9. PWM MODULATION PART CHECK
Check
P7905 9,10pin 3.3V
PWM MODULATION
PART CHECK
Refer to SMPS
troubleshooting
NO
Check if X701
12.288MHz is working
YES
YES
YES
YES
Check IC604 PS9831 VDD
pin power (4,10,22,29,39,47,
56,65,72,87,94) check X601
2pin 3.3V
Replace the related part
NO
YES
Check the
related part of
X701
OK
NO
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