LG DM5360K User manual

SERVICE MANUAL
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
Internal Use Only
JULY, 2016
MODEL: DM5360K (DM5360K, DMS5360F)
MODEL: DM5360K
(DM5360K, DMS5360F)
KARAOKE
MINI HI-FI SYSTEM
P/NO : AFN77552410

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 & UPDATE GUIDE.................................................................................................. 1-8
SPECIFICATIONS ............................................................................................................................................. 1-9
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 KEY MODE
Push both Front key and Remote Control key to activate it for 5 seconds.
1. Disc Lock On/Off (CD Function Only Active)
Front Key : PLAY/PAUSE
Remote Control Key : STOP
2. Check Version and Option code
Remote Control Key : Setup Display 16:9 1, 3, 9, 7, 1, 3, 9 Enter. OSD Display.
3. Clear EEPROM
Front Key : PLAY/PAUSE
Remote Control Key : 0
4. Edit EEPROM
DVD Function Pause 1, 4, 7, 2
5. Amp Clip On/Off
Front Key : PLAY/PAUSE
Remote Control Key : 7
Amp Clip Mode Change (AMP Clip On AMP Clip).
6. Sound Bypass
Front Key : PLAY/PAUSE
Remote Control Key : 1
7. APD TEST
Front Key : PLAY/PAUSE
Remote Control Key : 2

POWER ON
Press ‘Pause’ key once.
Remote control ‘Pause’ ‘1’ ‘4’ ‘7’ ‘2’ key in order.
DVD LOGO Status (NO Disk status)
Change will be applied when power OFF ON.
Press number 0 ~ 9, Press character A ~ F (1 ~ 6 for a while)
Move to appropriate position
and make changes with remote control ‘, , , ’ key.
1-7
SERVICE INFORMATION FOR EEPROM

1-8
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.
• 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.
• Before Updating the file, you should change the USB Function and then insert the USB device.
• If not, Sometimes system will be dead.
1. MPEG Program
1) File name is LG_DM5360LD1_1605270.rom
2) Put upgrade file into USB root directory. (No other file exist on root directory)
3) Change the mode to USB mode.
4) Insert the USB memory in the set.
5) It will start update process automatically with showing “MPEG UP” on Display window.
2. MCU Program
1) File name is DM5360_1605280.HEX
2) Put upgrade file into USB root directory. (No other file exist on root directory)
3) Change the mode to USB mode.
4) Insert the USB memory in the set.
5) It will start update process automatically with showing “MCU UP” on Display window.
6) If the update is finished, the set will turn off automatically.
PROGRAM DOWNLOAD & UPDATE GUIDE

SPECIFICATIONS
1-9
• GENERAL
Power requirements Refer to main label.
Power consumption Refer to main label.
Networked standby 0.5 W (If all network ports are activated.)
Dimensions (W x H x D) Approx. 204.5 mm x 278 mm x 285.5 mm
Net Weight (Approx.) Approx. 2.7 kg
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 90 %
• INPUTS/ OUTPUTS
AUX IN 2.0 Vrms (1 kHz, 0 dB), 600 Ω, RCA jack (L, R) x 1
VIDEO OUT 1.0 V (p-p), 75 Ω, sync negative, RCA jack x 1
HDMI 19 pin (Type A, HDMI™ Connector ) x 1
Microphone (MIC) Sensitivity 20 mV (1 kHz), 6.3 mm jack x 2
• AMPLIFIER (RMS Output power)
Total 230 W
Front 115 W x 2 (4 Ωat 1 kHz, THD 20 %)
• TUNER
FM Tuning Range 87.5 to 108.0 MHz or 87.50 to 108.00 MHz
• SYSTEM
Frequency response 100 to 20,000 Hz
Signal-to-noise ratio 75 dB
Dynamic range 75 dB
Bus Power Supply (USB) 5 V 500 mA
USB Version 2.0
• FRONT SPEAKERS
Type 2 Way 2 Speaker
Impedance 4 Ω
Rated Input Power 115 W
Max. Input Power 230 W
Dimensions (W x H x D) Approx. 203 mm x 284.5 mm x 200 mm
Net Weight Approx. 2.1 kg
• Design and specifications are subject to change without notice.

1-10

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

A
DISPLAY
MAIN
SMPS
300300
G
B
C
J
H
I
D
F
A
D
J
I
B
C
E
E
F
G
BT
MIC
H
256A
256B
258A
258B
257A
257B
CABLE1
CABLE3
CABLE4
CABLE2
254
492
492
250
251
252
253
A43
A48
259
539
452
266
262
452
A47
A00
A46
264
265
255
267
538
A52
265
537
505
505
505
459
459
505
261
825
505
452
260
505
505
263
263
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
801 Owner’s manual
900 Remote control
808 Batteries
804 Bag
803 Packing
803 Packing
802 Box
827 Microphone Disc & Songbook
832A

3. SPEAKER SECTION
A60
A60F
A60F

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............................................................................................................................................. 3-9
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-14
1. POWER (SMPS) ................................................................................................................................... 3-14
2. MCS PART CHECK.............................................................................................................................. 3-17
3. FLD DISPLAY CHECK ......................................................................................................................... 3-18
4. PWM MODULATION CHECK............................................................................................................... 3-19
5. POWER AMP PART CHECK ............................................................................................................... 3-20
6. FUNCTION CHECK .............................................................................................................................. 3-21
7. TUNER FUNCTION CHECK................................................................................................................. 3-22
8. CD/DVD FUNCTION CHECK ............................................................................................................... 3-23
9. USB FUNCTION CHECK ..................................................................................................................... 3-24
10. BLUETOOTH FUNCTION CHECK....................................................................................................... 3-25
WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-26
1. SYSTEM 27 MHz CLOCK, RESET, FLASH R/W SIGNAL .................................................................. 3-26
2. SDRAM CLOCK.................................................................................................................................... 3-28
3. TRAY OPEN/CLOSE SIGNAL.............................................................................................................. 3-29
4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) .......................................................... 3-30
5. LENS CONTROL RELATED SIGNAL (NO DISC CONDITION) .......................................................... 3-31
6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) ......................................... 3-32
7. DISC TYPE JUDGEMENT WAVEFORMS ........................................................................................... 3-33
8. SPINDLE CONTROL WAVEFORMS (NO DISC CONDITION)............................................................ 3-34
9. MT1389 VIDEO OUTPUT WAVEFORMS ............................................................................................ 3-36
10. AUDIO OUTPUT FROM MT1389 ......................................................................................................... 3-37
11. AUDIO OUTPUT FROM PS9860 ......................................................................................................... 3-38
WIRING DIAGRAM.......................................................................................................................................... 3-39
BLOCK DIAGRAMS ........................................................................................................................................ 3-41
1. SYSTEM BLOCK DIAGRAM ................................................................................................................ 3-41
2. SMPS BLOCK DIAGRAM..................................................................................................................... 3-43
3. POWER BLOCK DIAGRAM ................................................................................................................. 3-45
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-47
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-47
2. MAIN - POWER CIRCUIT..................................................................................................................... 3-49
3. MAIN - MPEG CIRCUIT DIAGRAM...................................................................................................... 3-51
4. MAIN - SERVO CIRCUIT DIAGRAM.................................................................................................... 3-53
5. MAIN - AUDIO CIRCUIT DIAGRAM..................................................................................................... 3-55
6. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-57
7. MAIN - MCU CIRCUIT DIAGRAM ........................................................................................................ 3-59
8. MAIN - MIC CIRCUIT DIAGRAM.......................................................................................................... 3-61
9. DISPLAY - VFD CIRCUIT DIAGRAM................................................................................................... 3-63
10. DISPLAY - BT/ KEY CIRCUIT DIAGRAM ............................................................................................ 3-65
11. MIC CIRCUIT DIAGRAM ...................................................................................................................... 3-67
12. BT CIRCUIT DIAGRAM ........................................................................................................................ 3-69
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-71
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-73
1. SMPS P.C.BOARD ............................................................................................................................... 3-73
2. MAIN P.C.BOARD ................................................................................................................................ 3-77
3. DISPLAY P. C. BOARD ........................................................................................................................ 3-81
4. MIC P. C. BOARD................................................................................................................................. 3-85
5. BT P. C. BOARD................................................................................................................................... 3-85
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 & BRIDGE DIODE
1-1-1. Solution
Please check and replace F900, BD900 or TH900 on SMPS board.
1-1-2. How to troubleshoot (Countermeasure)
1) Check if the fuse F900 is open or short-circuit.
2) Check if the bridge diode BD900 is short-circuit by over current with a digital multi meter.
3) Check if the NTC thermistor TH900 is normal or open.
1-1-3. Service hint (Any picture/ Remark)
< F900 >
If F900 is not short-circuit,
replace it with a same
specifications one.
< TH900 >
If TH900 is open,
replace it with a new one.
< BD900 >
If BD900 is short-circuit,
replace it with a new one.
Powe r O N
Powe r OFF
mH
H
LN
A
C
i n 110~240V
+27V
AGND
+27V
AGND
GND
STBY
+12V
+5.2V
BTVCC
BTGND
12
VR900
10D471K
12
F900
T3.15AL 250V
1 2
PN900
VH-3Y
1 3
12 34
LF901
UM-007/UF16-45/14mH
Powe r O N
Powe r OFF
A
C
in 1
10~240V
+27V
AGND
+27V
AGND
GND
STBY
+12V
+5.2V
BTVCC
BTGND
CY902 471/250V
CM901
0.1uF/275V
R914
C907 0.1uF/50V
+
C905
22uF/450V
CY903 471/250V
1
3
2
4
BD900
KB406
R911 0R
PWM
2VCC_G
1VFB 4
SENSE
3VCC
6
DRAIN
5
DRAIN
7GND
IC904
OB2338
R947 1K
R948
2.2/1206
R949
2.2/1206
12 34
LF901
UM-007/UF16-45/14mH
TH900
5D-9
ZD903
18V 0.5W NC
D910 IN4007
HVCC
GND_EARTH
F900
F900
TH900
TH900
BD900
BD900

3-3
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. D907
1-2-1. Solution
Please check and replace D907 on SMPS board.
1-2-2. How to troubleshoot (Countermeasure)
1) Check the anode-cathod voltage of D907 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 >
Power O N
Powe r OFF
A
C
in 1
10~240V
+27V
AGND
+27V
AGND
GND
STBY
+12V
+5.2V
ER
BTVCC
BTGND
R924
5.1R/1206
+C919
220uF/25V
C918
100pF/1KV
R906 200K/0.5W
D906
FR107
R928 1k
ZD901 15V 0.5W
+
C922
1000uF/16V
2
4
3
1
PC900 EL817
R926 10k/1%
R925 330
+
C924
470uF/16V
D903
FR107
C926 0.1uF/X7R
D901
FR107
+
C908 22uF/50V
+
C920
47uF/25V
C906 102pF/630V
R927 10K
R910
2.2R/1206
FB901 BEAD
L900
10uH/2A
D907
SR360
23
1
IC902
TL431
CY905 471/250V
C925
470pF/50V
R929 9.53k/1%
1
4
3
2
65
7
8
9
10
T900
EE19
R901
5.1R/1206
C902
470pF/1kV
2
13
Q905
8550/DIP
R950 10K
R954
2.2R 3/4W
2010
R955 200K/O.5W
R956
10R
12 34
LF901
UM-007/UF16-45/14mH
R980
100K
C938
0.1uF/50V
+C940
220uF/25V
D911
FR107
+
C941
47uF/25V
R981
5.1R/1206
C939
470pF/50V
R982
2.2R 3/4W
2010
R983
100K
R985 0R
G
ND_EARTH
M_VCC
BT_VCC
BT_GND
D907
D907