LG SoundPlate LAP250H User manual

SoundPlate
SERVICE MANUAL
MODEL: LAP250H
CAUTION
BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS”
IN THIS MANUAL.
MODEL: LAP250HSERVICE MANUAL
P/NO : AFN76552488 JANUARY, 2015
Website http://biz.lgservice.com
Internal Use Only

1-1
CONTENTS
SECTION 1 ........ GENERAL
SECTION 2 ........ CABINET & MAIN CHASSIS
SECTION 3 ........ ELECTRICAL
SECTION 4 ........ REPLACEMENT PARTS LIST

1-2
SECTION 1
GENERAL
CONTENTS
ESD PRECAUTIONS......................................................................................................................................... 1-3
HIDDEN KEY MODE ......................................................................................................................................... 1-4
MCS/ EQ PROGRAM UPDATE GUIDE............................................................................................................ 1-5
SPECIFICATIONS ............................................................................................................................................. 1-6

1-3
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
HIDDEN KEY MODE
HIDDEN MODE KEYS
EEPROM CLEAR (Initialize) Main set ‘-’ (Volume) + Remote control ‘SOUND EFFECT’
VERSION CHECK Main set ‘-’ (Volume) + Remote control ‘Play’
UP REPEAT (Up)
DOWN Stop/Ok (Down)
RIGHT F.Skip (Right)
LEFT B.Skip (Left)
ENTER Play/Pause (Enter)
WIRELESS FACTORY Main set “VOL MIN” (volume minimum state) + Remote control ‘Mute’
for 5 seconds.

1-5
1. Preparation
- Remote control.
- Do format USB Memory to FAT32 File system.
- USB : Update file exist only in the USB Memory stick.
Ex ) LAP250H :
MCS E:\PG540_FW_LAP250H_Ver.bin (if UBS driver is E:\)
EQ E:\EQ_PRG.BIN (if USB driver is E:\)
2. Update
1) Power on.
2) Change the USB function.
3) Insert USB.
4) Display in LCD.
MCS : “MCS UP” “FINISH” “Power Off”

EQ : “EQ UP” “FINISH” “Power Off”

5) Loading is shown while updating.
Never remove USB or AC cord.
6) After update finish, show FINISH in VFD and power of automatically.
7) Power cord un-plug.
3. Option Check
1) Power On.
2) Press Set Volume - KEY(“ - ”) and Remote Control Play KEY(“ ”) during 3 seconds.
3) Check MCS Version
Ex)
4) Press Remote Control (“ ”) 3 seconds time.
Check EQ Version.
Ex)
5) Plug Out for Turn Off.
MCS/ EQ PROGRAM UPDATE GUIDE
MCS UP
P1411182
Q1411170
EQ UP
FINISH
FINISH

1-6
SPECIFICATIONS
• GENERAL (LAP250H)
Power requirements 120 V ~ 60 Hz
Power consumption 20 W
Networked standby : 1.5 W
(If all network ports are activated.)
Dimensions (W x H x D) 530 mm x 60 mm x 350 mm
(20.9 inch x 2.4 inch x 13.8 inch)
Net Weight (Approx.) 5.3 kg (11.7 lb)
Operating temperature 5 °C to 35 °C
Operating humidity 5 % to 90 %
• INPUT/OUTPUT
OPT. IN Optical jack x 1
PORTABLE IN 0.5 Vrms (3.5 mm stereo jack) x 1
HDMI IN 19 Pin (Type A, HDMI™ connector) x 2
HDMI OUT 19 Pin (Type A, HDMI™ connector) x 1
Available Digital Input Audio
Sampling Frequency 32 kHz, 44.1 kHz, 48 kHz, 96 kHz
• USB
Version 2.0
Bus Power Supply 5 V 500 mA
• AMPLIFIER
Total 100 W
Front 25 W x 2 (8 Ωat 1 kHz)
Subwoofer 50 W (4 Ωat 80 Hz)
THD 10 %
• BLUETOOTH
Codec SBC
•Designs and specifications are subject to change without prior notice.

2-1
SECTION 2
CABINET & MAIN CHASSIS
CONTENTS
PANEL DISASSEMBLY INSTRUCTIONS ........................................................................................................ 2-2
EXPLODED VIEWS ........................................................................................................................................... 2-3
1. CABINET AND MAIN FRAME SECTION ................................................................................................. 2-3
2. PACKING ACCESSORY SECTION ......................................................................................................... 2-5

2-2
PANEL DISASSEMBLY INSTRUCTIONS
1. Please use a tool such as Fig-1.
2. Panel disassembly in accordance with four hole criteria.
< Fig - 1. >
< Fig - 2. >

B/T
SMPS
MAIN
A
B
C
E
D
B
C
F
A
E
D
272
516
271
272
516
252
252
253
516
464
462
A43
263
464
464
462
462
262
261
A41
464
251
251
271
272 273
274
275
464
A52
462
462
443
443
443
256
443
470
462
462
255
A46
A47
516
271
CABLE1
A42
254
EXPLODED VIEWS
1. CABINET AND MAIN FRAME SECTION

2. PACKING ACCESSORY SECTION
801 Owner’s manual
806 Optical cable
820 USB extension cable
(Not supplied)
808 Battery
900 Remote control
300 Power cord
OPTIONAL PART
803 Packing
804 Bag
802 Box
803 Packing
802A Accessory box

3-1
SECTION 3 ELECTRICAL
CONTENTS
ONE POINT REPAIR GUIDE ............................................................................................................................ 3-2
1. NO POWER PROBLEM (PVDD) ............................................................................................................ 3-2
2. POWER ON ERROR .............................................................................................................................. 3-3
3. NO SOUND (PORTABLE FUNCTION) .................................................................................................. 3-5
4. NO BLUETOOTH.................................................................................................................................... 3-6
5. NO SOUND (USB).................................................................................................................................. 3-7
6. NO SOUND (OPTICAL).......................................................................................................................... 3-8
7. HDMI PROBLEM .................................................................................................................................... 3-9
ELECTRICAL TROUBLESHOOTING GUIDE................................................................................................. 3-10
1. DSP OPERATING CHECK................................................................................................................... 3-10
2. OPTICAL CHECK ................................................................................................................................. 3-10
3. PORTABLE PART CHECK................................................................................................................... 3-11
4. USB FUNCTION CHECK ..................................................................................................................... 3-11
5. HDMI PART CHECK............................................................................................................................. 3-12
6. AMP PART CHECK .............................................................................................................................. 3-12
7. LCD DISPLAY CHECK ......................................................................................................................... 3-13
WAVEFORMS OF MAJOR CHECK POINT.................................................................................................... 3-14
1. CRYSTAL.............................................................................................................................................. 3-14
2. FLASH MEMORY ................................................................................................................................. 3-15
3. TACT KEY............................................................................................................................................. 3-16
4. USB....................................................................................................................................................... 3-17
5. REMOTE CONTROL ............................................................................................................................ 3-18
6. OPTICAL............................................................................................................................................... 3-19
7. PORTABLE ........................................................................................................................................... 3-21
8. AUDIO PWM ......................................................................................................................................... 3-22
9. AUDIO AMP .......................................................................................................................................... 3-23
WIRING DIAGRAM.......................................................................................................................................... 3-25
BLOCK DIAGRAMS ........................................................................................................................................ 3-27
1. BLOCK DIAGRAM #1 ........................................................................................................................... 3-27
2. BLOCK DIAGRAM #2 ........................................................................................................................... 3-29
3. VOLTAGE BLOCK DIAGRAM .............................................................................................................. 3-31
CIRCUIT DIAGRAMS ...................................................................................................................................... 3-33
1. SMPS CIRCUIT DIAGRAM .................................................................................................................. 3-33
2. MAIN - DSP CIRCUIT DIAGRAM......................................................................................................... 3-35
3. MAIN - AMP CIRCUIT DIAGRAM......................................................................................................... 3-37
4. MAIN - POWER CIRCUIT DIAGRAM................................................................................................... 3-39
5. MAIN - HDMI CIRCUIT DIAGRAM ....................................................................................................... 3-41
6. FRONT CIRCUIT DIAGRAM ................................................................................................................ 3-43
CIRCUIT VOLTAGE CHART........................................................................................................................... 3-45
1. ICs......................................................................................................................................................... 3-45
2. CAPACITORS....................................................................................................................................... 3-46
3. CONNECTORS..................................................................................................................................... 3-47
PRINTED CIRCUIT BOARD DIAGRAMS ....................................................................................................... 3-49
1. SMPS P. C. BOARD DIAGRAM ........................................................................................................... 3-49
2. MAIN P. C. BOARD DIAGRAM ............................................................................................................ 3-51
3. FRONT P. C. BOARD........................................................................................................................... 3-53

3-2
ONE POINT REPAIR GUIDE
1. NO POWER PROBLEM (PVDD)
No power problem occurs when you power on the unit.
1-1. Solution
Replace SMPS board.
1-2. How to troubleshoot (Countermeasure)
1) Check the PVDD voltage 22.2 V at pin4, pin5, pin6.
When you check the no power at this point, then replace SMPS PCB board.
1-3. Service hint (Any picture / Remark)
< MAIN board top view >
PVDD
PVDD
CN601 pin4-6
CN601 pin4-6

3-3
ONE POINT REPAIR GUIDE
2. POWER ON ERROR
No display or Not working.
2-1. IC600
1) Check 12 VA at nearby L610 pin1 on IC600.
2) If 12 VA is not checked at the point, then find 22 VA at pin7 of IC600.
3) 2) is OK.Replace IC600.
2-2. IC603
1) Check 3.3 VA at L605.
2) If 3.3 VA is not checked at the point, then find 12 VA at pin3 of IC603.
3) 2) is OK Replace IC603.
< MAIN board top view >
< MAIN board top view >
L601
L601
L605
L605
IC600 pin7
IC600 pin7
IC603 pin3
IC603 pin3

3-4
ONE POINT REPAIR GUIDE
POWER ON ERROR
No display or Not working.
2-3. IC602
1) Check 5.2 VA at L604.
2) If 12 VA is not checked, then find 12 VA at pin3 of IC602.
3) 2) is OK Replace IC602.
2-4. IC601
1) Check 1.2 VA at L602.
2) If 1.2 VA is not checked, then find 5.2 VA at pin3 of IC601.
3) 2) is OK Replace IC601.
2-5. IC606
1) Check VCC_3.3 V at L608.
2) If VCC_3.3 V is not checked, then find 3.3 VA at pin1 of IC606.
3) Is the Power control “H”? Check pin3 of IC606.
4) 2) is OK Replace IC606, 3) is No Replace IC502.
< MAIN board top view >
< MAIN board top view >
< MAIN board top view >
L604
L604
L602
L602
L608
L608
IC602 pin3
IC602 pin3
IC601 pin3
IC601 pin3
IC606 pin3
IC606 pin3

3-5
ONE POINT REPAIR GUIDE
3. NO SOUND (PORTABLE FUNCTION)
3-1. Solution
Replace IC508 or portable jack (JK502).
3-2. How to troubleshoot (Countermeasure)
1) Please check the soldering status of portable jack (JK502).
2) Please check L501, L502(PORT_L, PORT_R signal) of portable jack (JK502).
If you cannot find input signal, replace portable jack (JK502).
3) If you can find input signal, check pin13, pin14 of IC508.
4) If you can’t find signal on pin13 and pin14, replace IC508.
3-3. Service hint (Any picture / Remark)
< MAIN board top view >
L502
L502
L501
L501
IC508
IC508
JK502
JK502

3-6
ONE POINT REPAIR GUIDE
4. NO BLUETOOTH
4-1. Solution
Replace IC502 on MAIN board. (No 3.3 V)
4-2. How to troubleshoot (Countermeasure)
1) Please check externally status of Bluetooth cable connection on your eyes
(at CN505 and Bluetooth Module).
2) Please check the 3.3 VA (at L504) If 3.3 VA is OK at L504,
please check BT_TX, BT_RX, BT_RST (pin25, pin27, pin29) of IC502 .
3) If you have no signal, please replace IC502.
4-3. Service hint (Any picture / Remark)
< MAIN board top view >
IC502
IC502
L504
L504
CN505
CN505

3-7
ONE POINT REPAIR GUIDE
5. NO SOUND (USB)
5-1. Solution
Replace IC502 on MAIN board.
5-2. How to troubleshoot (Countermeasure)
1) Please check USB voltage (5 V) of JK503 (pin1).
2) Please check USB data signal (D-, D+ ) of IC502 (to check pin2, pin3 at JK503).
If you have not data signal, please replace IC502.
5-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK503
JK503
(pin1)
(pin1)

3-8
ONE POINT REPAIR GUIDE
6. NO SOUND (OPTICAL)
6-1. Solution
Replace IC507 on MAIN board.
6-2. How to troubleshoot (Countermeasure)
1) Please check 3.3 VA at L525.
If you can check 3.3 VA, please confirm OPT_DET signal (R5E8) in MAIN board when optical mode.
2) In spite of process 1), set has abnormal output, then replace IC507.
6-3. Service hint (Any picture / Remark)
< MAIN board top view >
JK501
JK501
L525
L525
IC507
IC507
R5E8
R5E8

3-9
ONE POINT REPAIR GUIDE
< MAIN board top view >
< MAIN board top view >
7. HDMI PROBLEM
No display or No Sound.
7-1. HDMI jack connection
1) Check the HDMI jack connection correctly each port. (JK801, JK802 : IN, JK800 : OUT)
7-2. IC803
1) Check 3.3 V at pin1, pin4 of IC803 and 1.08 V at L803 nearby pin8 of IC803.
2) If 3.3 VA is not output. check 3.3 VA at pin1 of IC802.
3) 1), 2) is OK Replace HDMI board.
IC803
IC803
IC802
IC802
JK802
JK802
JK801
JK801
JK800
JK800