Chapters
Table of Contents
Troubleshooting
Related Manuals for LG XA14
Summary of Contents for LG XA14
- Page 1 Internal Use Only Website http://biz.lgservice.com MICRO Hi-Fi SYSTEM SERVICE MANUAL MODEL: XA14 (XAS14F) CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. 3972674...
- Page 2 CONTENTS SECTION 1 ..SUMMARY SECTION 2 ..CABINET & MAIN CHASSIS SECTION 3 ..ELECTRICAL SECTION 4 ..REPLACEMENT PARTS LIST...
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Page 3: Table Of Contents
SECTION 1 SUMMARY CONTENTS PRODUCT SAFETY SERVICING GUIDELINES FOR A/V PRODUCTS ........1-3 SERVICING PRECAUTIONS ........................1-4 • GENERAL SERVICING PRECAUTIONS • INSULATION CHECKING PRODEDURE • ELECTROSTATICALLY SENSITIVE (ES) DEVICES SERVICE INFORMATION FOR EEPROM ..................1-5 PROGRAM UPDATE GUIDE ........................1-6 SPECIFICATIONS ............................ -
Page 4: Product Safety Servicing Guidelines For A/V 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 A/V 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: Service Information For Eeprom
SERVICE INFORMATION FOR EEPROM POWER ON FLD no disc status Front ‘STOP’ + Remote control ‘FWD DETECT NEW EEPROM SKIP’ push same timing during 5s. (OPTION EDIT SCREEN) NAME FLD ‘OP0-xx…. Move to appropriate position and make changes with remote control ‘REPEAT / PLAY / BWD SKIP / FWD SKIP’. -
Page 7: Program Update Guide
1. HOW TO UPDATE ESS PROGRAM (1) Rename the file name to download as “LG_(MODEL NAME)_(Vresion).ROM” in upper cases. ex) XA14 : “LG_XA14_0905180.ROM” Refer to the Standard for naming of software. (2) Copy the file to the formatted USB, and burn it. -
Page 8: Specifications
SPECIFICATIONS • GENERAL Power consumption 15 W External dimensions (W x H x D) 150 x 205 x 200 (mm) Operating temperature 5°C ~ 35°C y t i • TUNER • AMPLIFIER Frequency Response 60 Hz ~ 20 KHz Signal-to-noise ratio 70 dB •... - Page 9 MEMO...
- Page 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 (XAS14F) ....................... 2-8...
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Page 12: Exploded Views
EXPLODED VIEWS 1. CABINET AND MAIN FRAME SECTION CABLE3 CABLE1 MAIN CABLE2 FRONT SMPS... - Page 13 MEMO MEMO...
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Page 14: Packing Accessory Section
2. PACKING ACCESSORY SECTION Battery Remote controller Instruction Ass'y Packing... -
Page 15: Speaker Section (Xas14F)
3. SPEAKER SECTION (XAS14F) A60L A60R... - Page 16 SECTION 3 ELECTRICAL CONTENTS ELECTRICAL TROUBLESHOOTING GUIDE ..................3-2 1. SMPS PART ............................3-2 2. MUTING CIRCUIT (MUTE) ........................3-3 3. AUDIO ABNORMAL ..........................3-4 4. AUDIO FUNCTION MODE ........................3-5 5. IC301 TROUBLESHOOTING ......................... 3-6 6. IC600 TROUBLESHOOTING ......................... 3-7 7.
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Page 17: Electrical Troubleshooting Guide
ELECTRICAL TROUBLESHOOTING GUIDE 1. SMPS PART 5.0V Is the F901 nomal? Replace the F901 (Use same type fuse) Replace the D901, D902, D903, D904 the D901, D902, D903, D904 nomal? Is the R901 nomal? Replace the R901 Vcc (9V-25V) supplied to Is the D906 nomal? IC901 pin5? Check or replace the D906... -
Page 18: Muting Circuit (Mute)
ELECTRICAL TROUBLESHOOTING GUIDE 2. MUTING CIRCUIT (MUTE) No mute Does "High" appear Check U600 pin17. at Q206, Q1 "B"? Check R635 Replace the R622 Check IC603 pin69 Check the "Low" Replace the TR Q206, Q1 of Q206, Q1 "C" Mute... -
Page 19: Audio Abnormal
ELECTRICAL TROUBLESHOOTING GUIDE 3. AUDIO ABNORMAL Audio abnormal Check the output Check the speakers connection U200 pin1, 2,14,15 Check the input signal Check the "High" of IC 200 pin7 of IC300 pin25, 26 Check the DC 9.5V Check the function Input of U503 pin24 Check the DC 12V Normal... -
Page 20: Audio Function Mode
ELECTRICAL TROUBLESHOOTING GUIDE 4. AUDIO FUNCTION MODE Portable Check the input signal Check the signal input CON541 of U503 Pin7, 8 Check the output signal of U503 pin19, 23 CD / USB Check the output signal of U502 pin55, 57 Check the input signal of U503 pin3, 4 and refer to CD trobleshooting... -
Page 21: Ic301 Troubleshooting
ELECTRICAL TROUBLESHOOTING GUIDE 5. IC301 TROUBLESHOOTING Check LCD display Check the power supply Refer to power supply IC501 3.3V to IC301 pin7 Check Check uCOM IC603 IC301 pin1, CS, pin3 WR pin56 CS, pin57 DAT, pin91 WR pin4 Data Replace uCOM... -
Page 22: Ic600 Troubleshooting
ELECTRICAL TROUBLESHOOTING GUIDE 6. IC600 TROUBLESHOOTING IC600 troubleshooting Check Refer to power supply 3.3V, both end voltage check and replace Q600 Q600 (3.3V) Check IC606 pin1 is "H", Check Q601 is "H" check and replace Q601 Check Check or replace L600 IC604 pin13 is 3.3V Check IC600 pin1, 6 and X601... -
Page 23: Ic601 Troubleshooting
ELECTRICAL TROUBLESHOOTING GUIDE 7. IC601 TROUBLESHOOTING IC601 troubleshooting Check Check Refer to MCU IC603 voltage IC601 pin34: CLK, MCU troubleshooting pin35: CKE 1.2V Check MCU IC603 Replace MCU 8. IC603 TROUBLESHOOTING IC603 troubleshooting Check Refer Both end voltage both end voltage of IC605 0f IC501, IC605 3.3V/6.2V (1.2V / 3.3V) Check IC603... -
Page 24: U503 Troubleshooting
ELECTRICAL TROUBLESHOOTING GUIDE 9. U503 TROUBLESHOOTING U503 troubleshooting Check the power supply to Refer to power troubleshooting U503 pin24 Check Check the JK601 pin47, 48 Vol_CLK/Vol_Data the SCL/SDA data of U503 pin25, 26 Check the control function Check or replace U503 10. -
Page 25: Cd Part
ELECTRICAL TROUBLESHOOTING GUIDE 11. CD PART Turn on CD Check Connector CN7, Check Open / Close open 3.3V close 0V Check Connector CN7, Check "READING " display open 3.3V close 0V Check Reading OK Check Connector CN503 Check pick-up movement Check U504 BA5826 Check U502 If play, Check audio output... -
Page 26: Cd Reading Check
ELECTRICAL TROUBLESHOOTING GUIDE 12. CD READING CHECK Check Connector locking CN2, CN500, CN503 Does sled motor move? Check CN500 pin3, 4 (SL+, SL-) Defective pick-up or U502, U504 Check CN503 pin13,16 (F+, F-) Does the laser move? Defective pick-up or U502, U504 Check CN503 pin10 (LD) Does laser light? Defective pick-up or Q501... -
Page 27: Usb Part
ELECTRICAL TROUBLESHOOTING GUIDE 13. USB PART Turn on USB Check "CHECKING" Check Connector CN401 or "USB" display Check uCOM IC603 Check power supply circuit USB +5V pin116, 117 (D+, D-) Check Reading OK Check CN401 pin2 5V Check uCOM IC603 Check CN401 pin3, 4 (D+, D-) pin116, 117 (D+, D-) If play, Check audio output... -
Page 28: Waveforms
WAVEFORMS 1. CD SEARCHING WAVEFORM U502 PIN61 EE U502 PIN62 TE U502 PIN60 FE 2. SPINDLE DRIVE & MOTOR WAVEFORM U504 PIN27 SL- U504 PIN26 SL+ U504 PIN1 SP- U504 PIN2 SP+ 3-13... -
Page 29: Cd Playing Waveform
3. CD PLAYING WAVEFORM U502 PIN62 TE U502 PIN61 EE U502 PIN60 FE U504 PIN2 SP+ U502 PIN14 TD U502 PIN13 FD 3-14... -
Page 30: Cd Stop Action Waveform
4. CD STOP ACTION WAVEFORM U504 PIN2 SP+ U504 PIN26 SL+ U504 PIN11 T+ U504 PIN18 F+ 5. CD READING WAVEFORM U502 PIN41 MCK U502 PIN19 DIN U502 PIN20 R/W U502 PIN21 BUSY 3-15... -
Page 31: Cd Playing Rf Waveform
U502 PIN39 LRCK U502 PIN40 BCK U502 PIN41 MCK U502 PIN38 DATA 6. CD PLAYING RF WAVEFORM U502 PIN63 RF 3-16... -
Page 32: Usb Operating Waveform
7. USB OPERATING WAVEFORM CN401 PIN3 D- CN401 PIN2 +5V CN401 PIN4 D+ 8. RADIO OPERATING WAVEFORM U101 PIN2 SDA U101 PIN8 RESET U101 PIN1 SCL 3-17... - Page 33 MEMO 3-18...
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Page 34: Wiring Diagram
WIRING DIAGRAM MAIN PCB 16P FFC CD PICK-UP MCU PCB 6P WIRE B T B CNT 2P WIRE 3P WIRE 9P WIRE 4P WIRE FRONT PCB SMPS PCB 10P WIRE USB PCB 3-19 3-20... -
Page 35: Block Diagrams
BLOCK DIAGRAMS 1. MAIN BLOCK DIAGRAM 16.93MHZ ANALOG DECK MECHANISM A,B,C,D,E,F L-ch/R_ch BU9543KV FUNCTION BD3490 TDA7266 RF+ SERVO DSP P/UP SLDO SPDO SLED±,F±,T± BA5826 SPINDLE± LOAD± MOTOR IC WM8782 DATA/Address LINE POTABLE IN MD SWITCH RESET D± MLC 9800 USB CON MCS LOGIC TUNER 3.3V... -
Page 36: Cd Block Diagram
2. CD BLOCK DIAGRAM FLASH EON25F20 Ω/ TDA7266SA 16.9344MHZ DECK MECHANISM A,B,C,D,E,F,RF CD/MDI PICK UP 7314 CD/mp3 (4CH) SDRAM OPEN/CLOSE MOTOR FOCUS/SLED DRIVE SLED±,F±,T± SPINDLE/TRACKING LOAD±,SPINDLE± (CD5888) AMP_STBY 32.768KHZ ALI M5675) PORT IN USBP, USBN USB CON TUNER CLK,DATA,RST SI4702 STANDBY 3.3V 3.3V... -
Page 37: Circuit Diagrams
BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter 1. SMPS CIRCUIT DIAGRAM FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. SHOULD... -
Page 38: Main Circuit Diagram
2. MAIN CIRCUIT DIAGRAM 3-27 3-28... -
Page 39: Mcu Circuit Diagram
3. MCU CIRCUIT DIAGRAM 3-29 3-30... -
Page 40: Main Cd Circuit Diagram
4. MAIN CD CIRCUIT DIAGRAM 3-31 3-32... -
Page 41: Front & Usb Circuit Diagram
5. FRONT & USB CIRCUIT DIAGRAM 3-33 3-34... -
Page 42: Circuit Voltage Chart
CIRCUIT VOLTAGE CHART PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) PIN NO. TEST VOLT(V) IC301(HT1622) IC502(BU9543) AGND 2.15 60-62 3.25 0.06 1.33... -
Page 43: Printed Circuit Board Diagrams
PRINTED CIRCUIT BOARD DIAGRAMS 1. MAIN P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-37 3-38... -
Page 44: Smps P.c.board
2. SMPS P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-39 3-40... -
Page 45: Front P.c.board
3. FRONT P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-41 3-42... -
Page 46: Mcu P.c.board
4. MCU P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 5. AUX P.C.BOARD (TOP VIEW) (BOTTOM VIEW) 3-43 3-44... - Page 47 MEMO MEMO 3-45 3-46...