LG CM5660 User manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
OCTOBER, 2016
MODEL: CM5660 (CM5660, CMS5760F)
MODEL: CM5660
(CM5660, CMS5760F)
MINI HI-FI SYSTEM
P/NO : AFN77612031

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
HIDDEN KEY MODE ......................................................................................................................................... 1-6
SERVICE INFORMATION FOR EEPROM........................................................................................................ 1-7
PROGRAM DOWNLOAD GUIDE...................................................................................................................... 1-8
SPECIFICATIONS ........................................................................................................................................... 1-10
1-2

1-3
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 cot-
ton 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
SERVICING PRECAUTIONS

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 M)
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)Conductive
Sheet
Resistor
(1 M)
Armband
1-4

1-5
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.
ESD PRECAUTIONS

1-6
HIDDEN MODE ENTRANCE KEY EXIT KEY
Version Check Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Remote Control Key ‘ ’ for 1.5 s
EEPROM Initial Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Auto Exit
Option EDIT Front ‘Stop’ + Remote Control Key ‘ ’ for 5 s Front ‘Stop’ + Remote Control Key ‘ ’
APD Test Display Front ‘Stop’ + Remote Control Key ‘3’ for 5 s Auto Exit
Clip Front ‘Stop’ + Remote Control Key ‘Mute’ for 5 s Auto Exit
Disc Lock
On/ Off Front ‘Stop’ + Remote Control Key ‘Stop’ for 5 s Front ‘Stop’ + Remote Control Key ‘Stop’ for 5 s
Power Disc Lock
On/ Off
Front ‘Stop’ + Remote Control Key ‘Region EQ’ for 5 s
or
Front ‘Stop’ + Front ‘Open’ for 5 s
Front ‘Stop’ + Remote Control Key ‘Region EQ’ for 5 s
or
Front ‘Stop’ + Front ‘Open’ for 5 s
Demo All Key Lock Front ‘Stop’ + Remote Control Key ‘9’ for 5 s Front ‘Stop’ + Remote Control Key ‘9’ for 5 s
Bluetooth Auto Power
On/ Off Front/ Remote Control Key ‘Power’ for 5 s
Front/ Remote Control Key ‘Power’ to SET ‘Power Off’
Child Safe
On/ Off Volume 0 (Min) + Front ‘Enter’ for 3 s Volume 0 (Min) + Front ‘Enter’ for 3 s
HIDDEN KEY MODE
/ /

POWER ON
VFD “NO DISC” status
It is possible at any function.
(ex. It is possible at VFD “NO USB” status, too.)
This is an example.
Front ‘Stop’ + Remote control ‘ ’
push same timing during 5 s
FLD “OP00-…..”
Move to appropriate position
And make changes with remote control
“ , , , REPEAT” key.
Press ‘Stop’ Key
VFD “WRITE OK”
Front ‘Stop’ + Remote control ‘ ’
push same timing during 5 s
VFD “E2P CLR”
Completed
1-7
SERVICE INFORMATION FOR EEPROM
/
NAME
OPT0
OPT1
OPT2
OPT3
OPT4
OPT5
OPT6
OPT7
OPT8
OPT9
OPT10
OPT11
OPT12
OPT13
OPT14
DETECT NEW EEPROM
(OPTION EDIT SCREEN)
HEX
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00

1. DSP PROGRAM
Download program file name must be HG640_CM5760(CM5660)_YYMMDDX.bin
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device
and disable the security software, then download the file to your set.
Downloading file proceeds in the same way at USB1 function and USB2 function.
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
1) (Fast) Format USB device.
2) Copy Firmware file to USB device.
NO USB
Insert USB device at USB function.
SEARCH

FIRMWARE

FINISH

AUTO POWER OFF
1-8
PROGRAM DOWNLOAD GUIDE

2. EQ PROGRAM
Download program file name must be EQ_PRG.BIN
If security program(Water Wall) is activated on PC, you must save the file to the USB storage device
and disable the security software, then download the file to your set.
Downloading file proceeds in the same way at USB1 function and USB2 function.
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
1) (Fast) Format USB device.
2) Copy Firmware file to USB device.
NO USB
Insert USB device at USB function.
SEARCH

EQ UP

FINISH

AUTO POWER OFF
1-9

SPECIFICATIONS
1-10
• GENERAL
Power requirements Refer to the main label on the unit.
Power consumption Refer to the main label on the unit.
Networked standby : 0.5 W (If all network ports are activated.)
Dimensions (W x H x D) Approx. 207 mm x 282 mm x 261 mm
Net Weight Approx. 3.5 kg
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 90 %
• INPUTS
Analog audio in (AUX IN) 2.5 Vrms (1 kHz, 0 dB), 75 Ω, RCA jack (L, R)
Portable in (PORT. IN) 1.4 Vrms (3.5 mm stereo jack) x 1
Microphone (MIC) Sensitivity 20 mV (1 kHz), 6.3 mm jack x 1
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
AM Tuning Range 522 to 1,620 kHz, 520 to 1,710 kHz or 522 to 1,710 kHz
• SYSTEM
Frequency Response 70 to 20,000 Hz
Signal-to-noise ratio More than 75 dB
Dynamic range More than 75 dB
Bus Power Supply (USB) 5 V 500 mA
• AMPLIFIER (RMS OUTPUT POWER)
Total 700 W
Front 350 W x 2 (4 Ωat 1 kHz, 20 % THD)
• FRONT SPEAKER
Type 2 Way 2 Speaker
Impedance 4 Ω
Rated Input Power 350 W
Max. Input power 700 W
Net Dimensions (W x H x D) Approx. 299 mm x 363 mm x 230 mm
Net Weight Approx. 5 kg
• Design and specifications are subject to change without notice.

SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
EXPLODED VIEWS ......................................................................................................................................... 2-3
1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-3
2. PACKING ACCESSORY SECTION ......................................................................................................... 2-7
3. SPEAKER SECTION ................................................................................................................................ 2-8
2-1

2-2

FRONT
MAIN
SMPS
300300
B/T
E
C
D
H
D
G
G
F
C
B
A
H
F
E
A52
A42
443
443
259
443
A47 443
264
443
263
A46
265
A44
266
269
262
443
443
260
443
443
251
443
443
443
255
255
443
254
A43
A56 498 CABLE1
CABLE4
A
B
443
A00
300300
H
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION
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.

2. PACKING ACCESSORY SECTION
2-7
808 Battery
900 Remote Control
802 Box
801 Owner’s manual
804 Bag
825 FM Wire Antenna
803 Packing
803 Packing

2-8
A60
3. SPEAKER SECTION

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 BOOTING (IN CD/USB FUNCTION)................................................................................................ 3-6
5. NO OPERATION OF MD........................................................................................................................ 3-9
6. NO SOUND........................................................................................................................................... 3-14
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-22
1. POWER (SMPS) ................................................................................................................................... 3-22
2. MCS PART CHECK.............................................................................................................................. 3-25
3. FLD DISPLAY CHECK ......................................................................................................................... 3-26
4. PWM MODULATION CHECK............................................................................................................... 3-27
5. POWER AMP PART CHECK ............................................................................................................... 3-28
6. TUNER / AUX FUNCTION CHECK...................................................................................................... 3-29
7. TUNER FUNCTION CHECK................................................................................................................. 3-30
8. CD FUNCTION CHECK........................................................................................................................ 3-31
9. DOUBLE USB FUNCTION ................................................................................................................... 3-32
WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-33
1. DSP (IC500).......................................................................................................................................... 3-33
2. SDRAM (IC504) .................................................................................................................................... 3-34
3. SERVO (IC401)..................................................................................................................................... 3-35
4. MOTOR DRIVER (IC400) ..................................................................................................................... 3-36
5. ADC (IC202).......................................................................................................................................... 3-37
6. USB (JK500) ......................................................................................................................................... 3-37
7. BLUETOOTH (CN501).......................................................................................................................... 3-38
WIRING DIAGRAM.......................................................................................................................................... 3-39
BLOCK DIAGRAMS ........................................................................................................................................ 3-41
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-41
2. POWER BLOCK DIAGRAM ................................................................................................................. 3-43
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-45
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-46
2. MAIN - DSP SoC CIRCUIT DIAGRAM................................................................................................. 3-47
3. MAIN - POWER PART CIRCUIT DIAGRAM ........................................................................................ 3-49
4. MAIN - ADC/DAC CIRCUIT DIAGRAM ................................................................................................ 3-51
5. MAIN - RF SERVO CIRCUIT DIAGRAM.............................................................................................. 3-53
6. MAIN - PWM/AMP IC CIRCUIT DIAGRAM .......................................................................................... 3-55
7. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-57
8. JACK CIRCUIT DIAGRAM ................................................................................................................... 3-59
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-61
1. ICs VOLTAGE....................................................................................................................................... 3-61
2. CAPACITORS VOLTAGE..................................................................................................................... 3-62
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-63
1. SMPS P.C.BOARD ............................................................................................................................... 3-63
2. MAIN P.C.BOARD ................................................................................................................................ 3-65
3. FRONT P.C.BOARD ............................................................................................................................. 3-67
4. JACK P.C.BOARD ................................................................................................................................ 3-69
3-1

3-2
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/ THERMISTOR/ BRIDGE DIODE
1-1-1. Solution
Please check and replace F901, TH901 or TH903, BD901 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 NTC thermistor TH900 or TH903 is normal or open.
3) Check if the bridge diode BD901 is short-circuit by over current with a digital multi-meter.
1-1-3. Service hint (Any picture/ Remark)
< F901 >
If F901 is not short-circuit,
replace it with a same
specifications one.
< BD901 >
If BD901 is short-circuit,
replace it with a new one.
<TH901 or TH903 >
If TH901 or TH903 is open,
replace it with a new one.

3-3
ONE POINT REPAIR GUIDE
1. NO POWER
If the unit doesn’t work by no PVDD problem, repair the set according to the following guide.
1-2. FUSE/ FET
1-2-1. Solution
Please check and replace F901, Q901 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F901 is open or short-circuit.
2) Check the anode-cathod voltage of D951 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 circuit >