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LG FH6 Service Manual

High power all-in-one speaker system
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Internal Use Only
High Power
All-in-One Speaker System
SERVICE MANUAL
MODEL: FH6
CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS"
IN THIS MANUAL.
P/NO : AFN77381458
MAY, 2016

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Summary of Contents for LG FH6

  • Page 1 Internal Use Only High Power All-in-One Speaker System SERVICE MANUAL MODEL: FH6 CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN77381458 MAY, 2016...
  • Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...

  • Page 3: Table Of Contents

    SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR AUDIO PRODUCTS ............ 1-3 SERVICING PRECAUTIONS ..........................1-4 • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES HIDDEN KEY MODE ............................1-5 SERVICE INFORMATION FOR EEPROM ......................1-6 PROGRAM DOWNLOAD GUIDE ........................

  • Page 4: Product Safety Servicing Guidelines For Audio Products

    When servicing this product, under no circumstances should the original design be modified or altered without permission from LG Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.

  • Page 5: Servicing Precautions

    SERVICING PRECAUTIONS CAUTION: Before servicing the Audio products covered by this Electrostatically Sensitive (ES) Devices service data and its supplements and addends, read and fol- Some semiconductor (solid state) devices can be damaged low the SAFETY PRECAUTIONS. easily by static electricity. Such components commonly are NOTE: if unforeseen circumstances create conflict between called Electrostatically Sensitive (ES) Devices.

  • Page 6: Hidden Key Mode

    DISPLAY 1) P-1212040 ※ If there is a sub P1-1212040 (Main) Front ‘Stop’ P2-1212040 (Sub) (FH6 : Front ‘Play’) 2) M 1211281 (Micom) Version Check POWER ON STATUS RMC ‘Play’ for 1.5s + RMC ‘Play’ for 5s 3) OP00 05...

  • Page 7: Service Information For Eeprom

    SERVICE INFORMATION FOR EEPROM POWER ON It is possible at any function. VFD “NO DISC” status This is an example on USB Function. Front ‘PLAY’ + Remote control ‘ I ’ DETECT NEW EEPROM push same timing during 5 s. (OPTION EDIT SCREEN) NAME OPT0...

  • Page 8: Program Download Guide

    PROGRAM DOWNLOAD GUIDE 1. MICOM PROGRAM Download program file name must be MICOM_FH6_YYMMDDX.HEX 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. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device.

  • Page 9: Mcs Program

    2. MCS PROGRAM Download program file name must be HG690_FH6_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. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device.

  • Page 10: Eq Program

    3. 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. Caution: When downloading the file, you should neither unplug the USB device, change to the other function, nor power off the device.

  • Page 11: Fota Update Step Using Bt App

    FOTA UPDATE STEP USING BT APP Step1. App Connecting Step2. Device version info (Check FW version) After connecting the BT APP with SET, When touch the “Device Version info” button, the user could fi nd the “Device Version info” user could fi nd the current and latest SET on Setting tab.
  • Page 12 Step5. Transfer FW Step6. FW fl ash writing After completed the download from server, After completed the download from the smart smart phone start to transfer the fi rmware to the phone, the SET overwrite the fi rmware to SET. The progress bar is displayed on BT App. fl...

  • Page 13: Specifications

    SPECIFICATIONS  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.
  • Page 14 SECTION 2 CABINET & MAIN CHASSIS CONTENTS DISASSEMBLY INSTRUCTIONS ........................2-2 EXPLODED VIEWS ............................2-5 1. CABINET AND MAIN FRAME SECTION ....................2-5 2. PACKING ACCESSORY SECTION ......................2-7...

  • Page 15: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Note: Assemble Guide is reverse disassembly guide. 1) Separating Screw 14EA at Case Rear. And Remove Case Rear. Figure 1. Case Rear 2) After Separate Cap 3EA, Remove Screw 7EA. And, Separate Knob. : Cap Figure 2. Panel Side R...
  • Page 16 3) After Separate Foot Rubber 3EA, Remove Screw 7EA. : Foot Rubber Figure 3. Panel Side L 4) Separating Screw 4EA at Chassis Main. And Remove Fan Bracket. Figure 4. Fan Bracket...
  • Page 17 5) Separating Screw 15EA at Chassis Main. And Remove Main PCB, SMPS PCB. Figure 5. Main PCB, SMPS PCB 6) Separating Screw 11EA at Wood Assy. And Remove Chassis Main. Figure 6. Chassis Main...

  • Page 18: Exploded Views

    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. A42L SMPS MAIN CABLE3 CABLE1 A42R DJ KEY CABLE2...

  • Page 19: Packing Accessory Section

    2. PACKING ACCESSORY SECTION 808 Batteries 801 Owner’s manual 825 FM antenna 900 Remote control 803 Main packing 804 Bag 802 Box...
  • Page 20 SECTION 3 ELECTRICAL CONTENTS ONE POINT REPAIR GUIDE ..........................3-2 1. NO POWER PROBLEM ......................... 3-2 2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD ........3-5 3. NO AUDIO FROM SPEAKER ....................... 3-12 4. NO SOUND ............................3-13 5.

  • Page 21: One Point Repair Guide

    ONE POINT REPAIR GUIDE 1. NO POWER PROBLEM No power problem occurs when you power on the unit. 1-1. FUSE/ BRIDGE DIODE 1-1-1. Solution Replace F901, BD901 on SMPS board. 1-1-2. How to troubleshoot (Countermeasure) 1) Look at the physical of fuse F901. 2) Check the bridge diode BD901 1-1-3.
  • Page 22 ONE POINT REPAIR GUIDE NO POWER PROBLEM No power problem occurs when you power on the unit. 1-2. 5.5 VA, 12.5 VA 1-2-1. Solution Replace D951, D952, IC901. 1-2-2. How to troubleshoot (Countermeasure) Case 1) 5.5 VA Abnormal: Check D951, D952 and replace it. Case 2) 12.5 VA Abnormal: Check D954 and replace it.
  • Page 23 ONE POINT REPAIR GUIDE NO POWER PROBLEM No power problem occurs when you power on the unit. 1-3. PVDD 50 VA/ 40 VA 1-3-1. Solution Replace D981, IC931, Q921. 1-3-2. How to troubleshoot (Countermeasure) Case 1) PVDD (50 VA/ 40 VA) abnormal: Check D981 and replace it. Case 2) All voltage abnormal: Check IC931, Q921 and replace it.
  • Page 24 ONE POINT REPAIR GUIDE 2. NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-1. IC303/ IC302 (NO 3.3 VA /1.2 VA) 2-1-1.

  • Page 25: Booting When You Turn The Unit On, No Message On Vfd

    ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-2. IC304 System 3.3 V (No System 3.3 V) 2-2-1.
  • Page 26 ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-3. IC301 (NO 12 V) 2-3-1.
  • Page 27 ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-4. X501/ X502 2-4-1. Solution Replace X501/ X502 on MAIN board.
  • Page 28 ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-5. IC502 (SDRAM) 2-5-1. Solution Replace IC502 on MAIN board.
  • Page 29 ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-6. IC504 (Serial Flash Memory) 2-6-1.
  • Page 30 ONE POINT REPAIR GUIDE NO BOOTING WHEN YOU TURN THE UNIT ON, NO MESSAGE ON VFD When you turn on your set, it will blank / no message on VFD, and it will not boot-up. 2-7. IC501 (MCS IC) 2-7-1. Solution Check IC501 on MAIN board.

  • Page 31: Audio From Speaker

    ONE POINT REPAIR GUIDE 3. NO AUDIO FROM SPEAKER There is no sound output from speaker. 3-1. PWM IC/ AMP IC 3-1-1. Solution Check IC701 (PWM IC) and IC702 (AMP IC) on MAIN board. 3-1-2. How to troubleshoot (Countermeasure) 1) Please check PWM_3V3 of IC701. If 3.3 V is abnormal, check IC304.
  • Page 32 ONE POINT REPAIR GUIDE 4. NO SOUND “No USB” message is displayed on VFD, in the USB function. 4-1. USB FUNCTION 4-1-1. Solution Check IC306 on MAIN board. 4-1-2. How to troubleshoot (Countermeasure) 1) Check USB_5V of CN102 (pin7, 8, 9). If USB_5V is abnormal, check IC306 and IC305.

  • Page 33: Sound

    ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the AUX function. 4-2. AUX FUNCTION 4-2-1. Solution Check IC201 (ADC IC) on MAIN board. 4-2-2. How to troubleshoot (Countermeasure) 1) Check AUX L/R signal of IC201. (pin23, 24) If there is no signal, check JK201 or AUX source set.
  • Page 34 ONE POINT REPAIR GUIDE NO SOUND There is no sound output in the Tuner function. 4-3. TUNER FUNCTION 4-3-1. Solution Check IC203 (Tuner IC) on MAIN board. 4-3-2. How to troubleshoot (Countermeasure) 1) Check Tuner L/R signal of IC203. (pin13, 14) If the signal is OK, check ADC IC block.

  • Page 35: Bt Connection Error

    ONE POINT REPAIR GUIDE 5. BT CONNECTION ERROR When you connect wireless connection (like mobile phone, multi-room SPK, etc) through the BT, the “BT 2“ message appears. 5-1. BT module 5-1-1. Solution Replace BT module. 5-1-2. How to troubleshoot (Countermeasure) 1) Check your BT device.

  • Page 36: Lighting (Spk Led, Sparkling Led)

    ONE POINT REPAIR GUIDE 6. NO LIGHTING (SPK LED, SPARKLING LED) 6-1. SPK LED, Sparkling LED 6-1-1. Solution Check the following steps. 6-1-2. How to troubleshoot (Countermeasure) 1) Check CN104 and harness cable connection. Check LED control signal of CN104. - SPK LED : pin5, 6, 7, 9, 10, 11 - Sparkling LED : pin13, 14, 15, 17, 18, 19 If the signal is OK, check LED PCB assembly.

  • Page 37: Protection Symptom Occurrence

    ONE POINT REPAIR GUIDE 7. PROTECTION SYMPTOM OCCURRENCE Auto power-off and “S-protection” or “D-protection” is displayed on VFD. S-protection is displayed when over-current or over-temperature is detected on output. D-protection is displayed when the DC level is detected on output. (Audio signal is AC level.) 7-1.

  • Page 38: Electrical Troubleshooting Guide

    ELECTRICAL TROUBLESHOOTING GUIDE 1. SYSTEM POWER SUPPLY ON SMPS BOARD No 5.5 VA Replace F901 (same fuse). Is F901 normal? Replace TH901. Is TH901 normal? Replace BD901. Is BD901 normal? Is the VCC Check or replace. (14 V ~ 30 V) supplied to IC901 pin2? Is D951, D952 normal? Replace D951, D952.
  • Page 39 ELECTRICAL TROUBLESHOOTING GUIDE SYSTEM POWER SUPPLY ON SMPS BOARD No 12.5 VA Replace F901 (same fuse). Is F901 normal? Replace TH901. Is TH901 normal? Replace BD901. Is BD901 normal? Is the VCC Check or replace. (14 V ~ 30 V) supplied to IC901 pin2? Is D954 normal? Replace D954.
  • Page 40 ELECTRICAL TROUBLESHOOTING GUIDE SYSTEM POWER SUPPLY ON SMPS BOARD No PVDD (50 VA / 40 VA) Check IC501 (MLC3730S) IC on MAIN board. Is the P-CTRL normal? Is the VCC Is Q901 normal? (18 V ~ 25 V) supplied to IC931 pin4? Check or replace Q901.
  • Page 41 ELECTRICAL TROUBLESHOOTING GUIDE 2. POWER SUPPLY ON MAIN BOARD No 3.3 V Is the Is D302 normal? VCC supplied to IC304 Check or replace D302. pin3? Are D301 & D304 Check or replace D301 & D304. normal? Check 5.5 VA on SMPS board. Is there Check IC501 pin150 signal at IC304...

  • Page 42: Power Supply On Main Board

    ELECTRICAL TROUBLESHOOTING GUIDE POWER SUPPLY ON MAIN BOARD No 12 V Check 12.5 VA on SMPS board. Is the VCC supplied to IC301 pin2? Check IC501 pin150 (PWR_CTRL). Is there signal at IC301 pin1? Check IC301 and replace. No 1.2 VA Is the VCC supplied to IC302 pin3? Check 5.5 VA on SMPS board.
  • Page 43 ELECTRICAL TROUBLESHOOTING GUIDE POWER SUPPLY ON MAIN BOARD No 5 V (LED lighting) Check 5.5 VA on SMPS board. Is the VCC supplied to IC307 pin3? Check IC501 pin174 (VFD_PWR_CTRL). Is there signal at IC307 pin2? Check IC307 and replace. No 5 V (MIC/ AUDIO) Is the VCC supplied to IC305 pin3? Check 5.5 VA on SMPS board.
  • Page 44 ELECTRICAL TROUBLESHOOTING GUIDE POWER SUPPLY ON MAIN BOARD No 5 V (USB) Check 5 V output of IC305. Is the VCC supplied to IC306 pin1? Check IC501 pin22 (USB_PCTRL). Is there signal at IC306 pin3? Check IC306 and replace. 3-25...

  • Page 45: System Part

    ELECTRICAL TROUBLESHOOTING GUIDE 3. SYSTEM PART Power On Check supplied power from SMPS board. “HELLO” display on VFD OK? CN402 & CN902 8P cable Check 8p harness cable. connection OK? CN102 & CN401 20P cable Check 20p harness cable. connection OK? Check or replace VFD901.
  • Page 46 ELECTRICAL TROUBLESHOOTING GUIDE 4. NO AUDIO OUTPUT No Audio Output Check IC304 pin3 & pin2. IC701 PWM_3V3 OK? Replace X701. X701 12.288 MHz OK? Check IC501 pin B10/ D7/ C7/ D8/ C8. IC701 pin20, 21, 22, 23, 24 data OK? Check SMPS board (PVDD) and IC301 (12 V).

  • Page 47: Audio Output

    ELECTRICAL TROUBLESHOOTING GUIDE NO AUDIO OUTPUT No USB play Check IC306 and IC305. JK401 VCC (5 V) OK? Check CN401 & CN201 connection. Is USB signal OK? No AUX IN play IC201 AUX input signal (pin23, 24) OK? Check JK201 or AUX IN cable. Check IC501.
  • Page 48 ELECTRICAL TROUBLESHOOTING GUIDE NO AUDIO OUTPUT No MIC play Check IC801 or MIC jack on MIC PCB assembly. IC202 MIC input signal (pin13, 14) OK? Check IC501. IC202 I2S input signal (pin6, 7, 8) OK? Check IC202. IC202 MIC data signal (pin9) OK ? 3-29...

  • Page 49: Protection Mode

    ELECTRICAL TROUBLESHOOTING GUIDE 5. PROTECTION MODE D-Protection/ S-Protection CN702, CN703 is OK? Re-Solder CNT. (soldering status) PVDD voltage of IC702 OK? Check SMPS board. (40 ~ 50 V) Check L701, L702, C720, C738. SPK output line of IC702 OK? 3-30...

  • Page 50: Lighting

    ELECTRICAL TROUBLESHOOTING GUIDE 6. NO LIGHTING No Sparkling LED IC307 pin6 Check IC307. 5 V power OK? CN104 Check CN104 pin13, 14, 15, 17, 18, 19 and CN1004/ CN1001 connection. signal OK? IC101 pin24, 25, 26, 27, 28, 29 Check Q113 ~ Q124. signal OK? Check or replace IC101.

  • Page 51: Waveforms Of Major Check Point

    WAVEFORMS OF MAJOR CHECK POINT 1. DSP (IC501) X X I X X I Fig 1-1. X502: Crystal of RTC 32.768 kHz Fig 1-2. X501: Crystal of system 24 MHz (R516 both sides) (R508, R507) 3-32...

  • Page 52: Sdram (Ic502)

    2. SDRAM (IC502) Fig 2. SDRAM (IC502 pin38, 53, 35, 19) 3-33...

  • Page 53: Serial Flash (Ic504)

    3. SERIAL FLASH (IC504) 4. ADC (IC201) Fig 3. Serial Flash SPI Fig 4. ADC I2S (IC504 pin1, 2, 6, 8) (IC201 pin42, 43, 44) 13 14 3-34...

  • Page 54: Usb (Cn102)

    5. USB (CN102) 6. BLUETOOTH (CN201) B B T_TX BT_TX BT_TX BT_RX BT_RX BT_RX BT_RST BT_RST BT_RST Fig 5. USB D+/D- Fig 6. BT_TX / BT_RX / BT_RST (CN102 pin13, 15) (CN201 pin4, 6, 9) 3-35...
  • Page 55 3-36...

  • Page 56: Wiring Diagram

    WIRING DIAGRAM RIGHT LEFT SPK LED SPK LED (28X26 FR4-2) (28X26 FR4-2) 8P/Harness (83X36 FR4-2) 3P/Harness (142X25 FR1-1) CENTER CENTER Main+AMP 10P/FFC UP LED DOWN LED 20P/Harness (140X155 FR4-2) (130X20 FR4-2) (130X20 FR4-2) 20P/Harness DJ KEY (276X180 FR1 -1) SMPS 15P/Harness (230X135 CEM -1) Display...

  • Page 57: Block Diagrams

    BLOCK DIAGRAMS 1. SYSTEM BLOCK DIAGRAM OUTPUT (4 Ω) 24 MHz AMP BLOCK 12.288 MHz 300 W x 2 SF2_CS Serial PWM_SDA/SCL/RST/MUTE Flash (1 MB) 10 uH/ 14 A AMP_PDN FR± AMP_PROTECT/SD/CLIP, S. FLASH SDRAM SF_CS DC_PROTECTION TAS5548 TAS5631B 16 MB 32 MB FL±...

  • Page 58: Smps Block Diagram

    2. SMPS BLOCK DIAGRAM 1’st 2’nd STR2A153D Photo Coupler 431 IC (Controller + FET) 5.5V Bridge Diode 12.5V EER2828 P- ctrl Photo Coupler MAIN NCP1250(DIP) V- ctrl Photo Coupler 431 IC LC Filter V- ctrl L : 50V S S PW17N80C3 V- ctrl H : 40V EER4242 or EER5345 EER4242...

  • Page 59: Circuit Voltage Chart

    CIRCUIT VOLTAGE CHART 1. IC VOLTAGE 2. CAPACITOR VOLTAGE Pin No. Description Spec (V) Power-On Mode Pin No. Description Spec (V) Power-On Mode Power-On Mode Location Value_Spec Voltage_Spec IC101 (R5F100GEAFB#30) PDD12ALIVE 1.23 Positive (+) Negative (-) 3.32 VDD12PLL 1.23 CA201 220uF 6.3V 3.31...

  • Page 60: Printed Circuit Board Diagrams

    PRINTED CIRCUIT BOARD DIAGRAMS 1. SMPS P. C. BOARD DIAGRAM (TOP VIEW) 3-73 3-74...
  • Page 61 SMPS P. C. BOARD DIAGRAM (BOTTOM VIEW) NOTE) Warning Parts that are critical with respect to risk of fire or electrical shock. 3-75 3-76...

  • Page 62: Main P. C. Board Diagram

    2. MAIN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-77 3-78...

  • Page 63: Vfd P. C. Board Diagram

    3. VFD P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 4. MIC P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 5. CENTER LED UP P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-79 3-80...

  • Page 64: Center Led Down P. C. Board Diagram

    6. CENTER LED DOWN P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 7. SPK LED RIGHT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 8. SPK LED LEFT P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-81 3-82...
  • Page 65 9. DJ KEY P. C. BOARD DIAGRAM (TOP VIEW) 3-83 3-84...

  • Page 66: Dj Key P. C. Board Diagram

    DJ KEY P. C. BOARD DIAGRAM (BOTTOM VIEW) 3-85 3-86...

  • Page 67: Front Key P. C. Board Diagram

    10. FRONT KEY P. C. BOARD DIAGRAM (TOP VIEW) (BOTTOM VIEW) 3-87 3-88...

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