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Internal Use Only Website http://biz.lgservice.com Wireless Sound Bar SERVICE MANUAL MODEL: LAS450H / LAC550H CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77152089 MARCH, 2015...
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CONTENTS SECTION 1 ..GENERAL SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..WIRELESS SUBWOOFER PART SECTION 5 ..REPLACEMENT PARTS LIST...
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.
WIRELESS SUBWOOFER CONNECTION LED indicator of wireless subwoofer LED Color Status Yellow-green The connection is trying. (Blink) Yellow-green The connection is completed. The wireless subwoofer is in standby mode or the connection is failed. The power cord of wireless (No display) subwoofer is disconnected.
HIDDEN KEY MODE HIDDEN MODE KEYS EEPROM EDIT Main set ‘-’ (Volume) + Remote control ‘OPTICAL’ EEPROM CLEAR (Initialize) Main set ‘-’ (Volume) + Remote control ‘SOUND EFFECT’ VERSION CHECK Main set ‘-’ (Volume) + Remote control ‘Play’ CLIP OFF CLIP ON Main set ‘-’...
MCS / EQ PROGRAM UPDATE GUIDE 1. Preparation - Remote control. - Do format USB Memory to FAT32 File system. - USB : Update fi le exist only in the USB Memory stick. Ex ) LAS550H : E:\PG540_FW_LAS550H_Ver.bin (if USB driver is E:\) ...
SPECIFICATIONS • GENERAL Power requirements Refer to the main label on the unit. Power consumption Refer to the main label on the unit. Networked standby : 2.3 W (If all network ports are activated.) Dimensions (W x H x D) 890 mm x 55 mm x 89 mm Net Weight (Approx.) 2.72 kg...
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SECTION 2 CABINET & MAIN CHASSIS CONTENTS EXPLODED VIEWS ............................2-3 1. MAIN SET SECTION ..........................2-3 2. WIRELESS SUBWOOFER SECTION ...................... 2-5 3. PACKING ACCESSORY SECTION ......................2-7...
EXPLODED VIEWS 1. MAIN SET 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 263L LITERATURE. 261L A44B SPK703 SMPS MAIN A44A 263R CABLE2 WIRELESS CABLE3 SPK704...
2. WIRELESS SUBWOOFER 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. A900 A900W CN901 A47W SMPS A49W A54W A45W 300W WIRELESS...
3. PACKING ACCESSORY SECTION 801 Owner’s manual OPTIONAL PART 820A USB gender 806 Optical cable 826 Filter, Ferrite Core 823 HDMI cable 808 Batteries (2) 829 Cable tie 835 Wall bracket 836 Screws (2) 837 Cover foot (2) 900 Remote control 803 Packing 804 Bag 802 Box...
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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) ....................3-4 4. NO WIRELESS ............................3-5 5. NO BLUETOOTH ............................ 3-6 6.
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 18.7 V at pin1, 2, 3. When you check the no power at this point, then replace SMPS board.
ONE POINT REPAIR GUIDE 2. POWER ON ERROR No display or Not working. 2-1. IC601 1) Check 3.3 VA at L602. 2) If 3.3 VA is not checked at the point, then find 18.7 V at pin7 of IC601. 3) 1), 2) is NG. Replace IC601. L602 L602 IC601 pin7...
ONE POINT REPAIR GUIDE 3. NO SOUND (PORTABLE FUNCTION) 3-1. Solution Replace IC508 or portable jack (JK851). 3-2. How to troubleshoot (Countermeasure) 1) Please check the soldering status of JK851. 2) Please check L854, L855 (PORT_L, PORT_R signal) of portable jack (JK851). If you cannot find input signal, replace JK851.
ONE POINT REPAIR GUIDE 4. NO WIRELESS 4-1. Solution Replace IC505 on MAIN board.(No 3.3 V) 4-2. How to troubleshoot (Countermeasure) 1) Please check externally status of Wireless board to board connection on your eyes. (at CN506 and Wireless module) 2) Please check 3.3 V of WL_3V3 (at L509).
ONE POINT REPAIR GUIDE 5. NO BLUETOOTH 5-1. Solution Replace IC502 on MAIN board.(No 3.3 V) 5-2. How to troubleshoot (Countermeasure) 1) Please check externally status of Bluetooth cable connection on your eyes.(at CN508 and Bluetooth module) 2) Please check 3.3 V of 3.3VA (at L504). If 3.3 V is OK at L504, please check BT_SDA, BT_SCL, BT_RST (pin53, 51, 25) of IC502 and BT_RX, BT_TX (pin29, 27).
ONE POINT REPAIR GUIDE 6. NO SOUND (USB) 6-1. Solution Replace IC502 on MAIN board. 6-2. How to troubleshoot (Countermeasure) 1) Please check USB voltage (5 V) of JK853 (pin1) and CA851 in HDMI & JACK board. 2) Please check USB data signal (D-, D+) of IC502. (to check TP588, TP589 at CN507) If you have not data signal, please replace IC502.
ONE POINT REPAIR GUIDE 7. NO SOUND (OPTICAL) 7-1. Solution Replace IC507 on MAIN board. 7-2. How to troubleshoot (Countermeasure) 1) Please check 3.3 V of 3.3VA at L853 in HDMI & JACK board If you can check 3.3 V, please confirm OPT_DET signal (R5R8) in MAIN board when optical mode. 2) In spite of process 1), set has abnormal output, then replace IC507.
ONE POINT REPAIR GUIDE 8. HDMI PROBLEM No display or No Sound. 8-1. HDMI jack connection 1) Check the HDMI jack connection correctly each port. (JK801 : HDMI IN, JK800 : HDMI OUT) JK800 JK800 JK801 JK801 < HDMI & JACK board top view > 8-2.
5. REMOTE CONTROL 16 17 FIG 5-1. Input Voltage FIG 5-2. Low Timing Item Measured Spec. IR Receiver Spec: Input Level 3.3 V 2.7 ~ 5.5 V “ Low” Timing 4.4 ms 3.6 ms ~ 5.04 ms “ High” Timing 4.48 ms 4.08 ms ~ 5.04 ms FIG 5-3.
DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter 1. SMPS CIRCUIT DIAGRAM PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...
CIRCUIT VOLTAGE CHART Designator Description Voltage Spec Measured Voltage Designator Description Voltage Spec Measured Voltage CONNECTORS IC501 IC,Serial Flash Memory 3.3 VA 3.4 V 5.17 V 1, 20, 43, 90, 132, 158 3.3 VA (IO) 3.34 V CN501 Connector, B to B 12 V 12.03 V 57, 60, 164...
PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P. C. BOARD DIAGRAM (TOP VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. (BOTTOM VIEW) 3-41 3-42...
3. HDMI & JACK P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. FRONT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 5. TACT KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-45 3-46...
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SECTION 4 WIRELESS SUBWOOFER PART CONTENTS ONE POINT REPAIR GUIDE ..........................4-2 1. NO POWER PROBLEM (PVDD) ......................4-2 2. POWER ON ERROR ..........................4-3 3. POWER ON ERROR ..........................4-4 4. WIRELESS CONNECTION ........................4-5 WAVEFORMS OF MAJOR CHECK POINT ...................... 4-6 1.
ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM (PVDD) No power problem occurs when you power on the unit 1-1. Solution If you check these points and find PVDD voltage is not checked, replace woofer SMPS board. 1-2. Service hint (Any picture / Remark) PVDD PVDD pin3, 4, 5, 6 at WCN601...
ONE POINT REPAIR GUIDE 2. POWER ON ERROR Fundamental power check points 2-1. 12 V 1) Check 12 V at WL604 nearby WL603 coil. 2) If 12 V is not checked at the point, then find PVDD at pin7 of WIC606. 3) 1), 2) is NG ...
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ONE POINT REPAIR GUIDE 3. POWER ON ERROR MAIN SoC IC supply voltage check points 3-1. 3.3 VA 1) Check 3.3 VA at WCA603 and WL627. 2) Check 3.3V_PWM at pin5 of WIC605. 3) Check 3.3 VA at pin7, 8 of WIC603. 4) Check 3.3V_PWM at WL615 nearby WIC601.
DIFFER FROM THE ACTUAL CIRCUIT USED. THIS 2. Voltages are DC-measured with a digital voltmeter 1. WOOFER SMPS CIRCUIT DIAGRAM PERMISSION FROM THE LG CORPORATION. ALL WAY, IMPLEMENTATION OF THE LATEST SAFETY during Play mode. COMPONENTS SHOULD BE REPLACED ONLY WITH...
PRINTED CIRCUIT BOARD DIAGRAMS 1. WOOFER SMPS P. C. BOARD (TOP VIEW) (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 4-21 4-22...