Page 1
MINI HOME THEATER SYSTEM SERVICE MANUAL MODELS: MBD-K62Q, MBS-K62V CAUTION BEFORE SERVICING THE UNIT, READ THE “SAFETY PRECAUTIONS” IN THIS MANUAL. P/NO : AFN33894946 MAY, 2007...
CONTENTS SECTION 1 5. AT POWER ON, SPINDLE SIGNAL AT MD DECK ............3-25 SUMMARY 6. AT FIRST ACTION, FOCUS SIGNAL A, B, C, D..........3-25 SERVICING PRECAUTIONS ........1-2 7. TRACKING SIGNAL ........3-26 • NOTES REGARDING HANDLING OF THE PICK-UP 8. RF WAVEFORM ..........3-26 •...
SECTION 1 SUMMARY SERVICING PRECAUTIONS 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.
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.
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.
SPECIFICATIONS • GENERAL Power supply Refer to the back panel of the unit. Power consumption Refer to the back panel of the unit. Net Weight 3.00kg External dimensions (WxHxD) 300 x 130 x 243mm • CD/DVD Laser Semiconductor laser, wavelength 650nm Signal system PAL 625/50, NTSC 525/60 Frequency response (audio)
2. DECK MECHANISM SECTION (DP-10A) NSP : Non SVC Parts 015B AL LOCA. NO. LG PART NO. DESCRIPTION SPECIFICATION REMARKS 6721RJD100T Deck Assembly,DVD HOME THEATER DP-10A (HZ) 015A 4861R-0016B Clamp Assembly DVD DISC DP7 - SH Clamp Assemb 3041R-T010B Base Assembly...
SECTION 3 ELECTRICAL ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 1. MICOM PART CHECK I MICOM part check I Refer to SMPS Check P7904 Troubleshooting 6PIN P-SENS Check Check Check Replace the power of both the related part of if IC101 KIA7042 related parts terminals of IC101 input is over 5V.
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 2. MICOM PART CHECK II MICOM part check II Refer to SMPS Check P7904 Troubleshooting 5PIN 5.6V Check D101 1SR35 Check power of both terminals of D101 output is working on 5V 1SR35 Replace the Check the related part related parts...
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 3. IC103 KS4CD21CS CHECK Check IC100 78KOKF2 22, 24PIN Refer to MICOM 22 PIN DATA Check MICOM Troubleshooting 24 PIN CLK power 5V Check the Replace the related parts related part...
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 4. FLD DISPLAY CHECK FLD display check Refer to SMPS Check P7904 Troubleshooting 1,2,3 power. F1+,F2- both terminals: over 3.7V Check power VKK: over -28V. Check P7302 connection condition and power F1+, Check P7302 assembly F2- both terminals: over 3.7V Check power VKK: over -28V Check 24...
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 5. PWM MODULATION PART PWM modulation part Refer to SMPS Check P7905 Troubleshooting 9PIN 3.3V Check IC604 PS9829 VDD PIN power (3,10,22,29,39,47,56,65, 72,87,94) Check X601 2PIN 3.3V Check if Check the Replace the related part X601 12.288MHz is related part of X601 working.
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 7. PORTABLE FUNCTION Portable function Check if JK305 contacts with Check IC200 Check IC200 Check u-COM (IC100) (BU4052) 16PIN V (BU4052) 4, 11PIN input 3, 69PIN communication. 8PIN V power. waveform. Replace the related parts Check IC200 (BU4052) 3, 13PIN output waveform.
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 8. TV-AUDIO FUNCTION TV-Audio function Check SW4S1 Check Video out Check Audio in Check IC200 Check IC200 Check u-COM (BU4052) 16PIN V (BU4052) 5, 14PIN 3, 6PIN communication 8PIN V power input waveform Replace the related parts. Check IC200 (BU4052) 3, 13PIN output waveform...
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 10. SMPS POWER TROUBLESHOOTING No. 5.6VA Is the F101 Normal? Replace the F101 (Use the same Fuse) Is the BD101Normal? Replace the BD101 Is the TH101 Normal? Replace the R101 Is Vcc (9V ~ 18V) Is the D102 normal? supplied to IC101 2PIN?
Page 22
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART No 5.0V Is the Vcc(5.6V) Check or Replace the D959 supplied to IC957 1PIN? Check the CD CTL “H” Is the IC957 4PIN “H”? signal from µ-com Check or Replace the IC957 No 3.3V Is the Vcc(4.2V) Check or Replace the D943 supplied to IC955...
Page 23
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART No -12V Is the voltage of Check or Replace the D970 C932 -13V Check the PWR CTL Is the IC155 2PIN “H” signal from µ-com 12V? Check or Replace the Q942 No VF+ Is the ZD950 Replace the ZD950 Normal? Replace the R993 or Q950, Q943...
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 11. BLUETOOH PART (OPTIONAL PART) Check bluetooth module Check IC200 Check IC200 Check u-COM (IC100) (BU4052) 16PIN V (BU4052) 2, 15PIN input 3, 69PIN communication. 8PIN V power waveform. Replace the related parts Check IC200 (BU4052) 3, 13PIN output waveform.
ELECTRICAL TROUBLESHOOTING GUIDE OF AUDIO PART 12. IPOD PART (OPTIONAL PART) Turn on IPOD Loading Check the P5801 13PIN, 30PIN Check the P5801 13PIN and 30PIN line Check the P5801 OSD IPOD 18PIN, 19PIN Check the P5801 18PIN and 19PIN line Check IC200 Check IC200 Check u-COM (IC100)
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART 1. POWER CHECK GUIDE Power ON Select the DVD Mode Does it Does DVD Check an Audio appear DVD ERROR appear at FLD? (DVD INTERFACE) at FLD? Check Connector (P400, P401). Reconnect it. Check the Does No DISC or Refer to SMPS voltage of each pin on...
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART 2. TEST & DEBUG FLOW Power ON Check connection lines Flash between FLASH & ES8380 or Show LOGO? memory operates the FLASH access time whether properly? is suitable or not. Check connection lines between SDRAM (IC502) & SDRAM works ES8380 or the SDRAM is properly?
Page 28
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART Does the SLED Moter driver move to inner side Check the MD DRV_MUTE when it is at outer PIN is high? position? Check the related SLED circuit of SLED and signal is OK? motor driver IC (IC401) Check the cable connection with MECHA.
Page 29
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART Laser Check the laser power circuit DVDLD turns on when between ES8380 and power or CDLD output transistor. (Q405, Q406) reading disc? properly? Collector voltage of power Check the related circuit of laser power transistor. transistor is OK? (Q405, Q406) Check cable connection...
Page 30
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART Proper Check the connections between signal on A, B, C, D Focus on OK? P400 and pick-up head. from MD? Proper Check the related circuit of FOO signal on ES8380 focus signal. IC401? Check cable connection between P400 and MD.
Page 31
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART Audio Check the connections between signal data on outputs are OK ES8380 and DVD INTERFACE. DVD INTERFACE during playing is OK? DISK? Check the MAIN PCB For example composite video, Picture check the video mute TR signal data on (Q411), output of video buffer ES8380 is OK?
ELECTRICAL TROUBLESHOOTING GUIDE OF DVD PART 3. USB PART TURN ON USB “Checking” or Check the POWER supply circuit. “USB” display check (Check P7905) Check the HRST# signal Check the USB PART and DVD PART line. Check the USB JACK POWER supply. Reading OK check (Check P5301) Check the USB DATA LINE.
WAVEFORMS 1. WHEN POWER ON, RESET & DATA ETC WAVEFORM 1. RESET(DVD) 2. RX 3. TX 4. LCS3# (FLASH) Playing at USB function 1. HRST# 2. 5V 3. D- 4. D+ 3-22...
2. OPEN / CLOSE WAVEFORM AT POWER ON 1.Limit SW 2.OPEN 3.CLOSE 3. STARTING ACTION WAVEFORM IN MD DEVICE 1.SLO (from MPEG) 2.SLED- 3.SLED+ (At Power on ) 3-23...
Page 40
1-3. PIN DESCRIPTION PIN NAME SYMBOL AINR Rch Analog Input Pin AINL Lch Analog Input Pin CKS1 Mode Select 1 Pin VCOM Common Voltage Output Pin, VA/2 Bias voltage of ADC input. AGND Analog Ground Pin Analog Power Supply Pin, 4.5 ~ 5.5V Digital Power Supply Pin, 2.7 ~ 3.6V DGND Digital Ground Pin...
Page 54
9-3. PIN DESCRIPTION Pin Name Description Pin No. Clock input pin This pin reads serial data at the rising edge and outputs data at the falling edge. Data input pin When this pin acts as input pin, serial data is inputted at the rising edge of the shift clock (starting from the lower bit) Serial interface strobe pin The data input after the STB has fallen is processed as a...
Page 57
11-2. BLOCK DIAGRAM TO00/TI010/P01 16-bit timer/ event counter 00 TI000/P00 Port 0 P00 to P06 RxD6/P14 (LINSEL) TO01/TI011/P06 16-bit timer/ Port 1 P10 to P17 event counter 01 TI001/P05 Port 2 P20 to P27 8-bit timer H0 TOH0/P15 Port 3 P30 to P33 TOH1/P16 8-bit timer H1...
Page 58
11-3. PIN FUNCTION Function Name Function After Reset Altemate Function Port 0. Input port TI000 7-bit I/O port. TI010/TO00 Input/output can be specified in 1-bit units. SO11 Use of an on-chip pull-up resistor can be specified by SI11 a software setting. SCK11 TI001/SSI11 TI011/TO01...
Page 59
Function Name Function After Reset Altemate Function Port 7. Input port KR0 to KR7 P70 to P77 8-bit I/O port. Input/output can be specified in 1-bit units. Use of an on-chip pull-up resistor can be specified by a software setting. P120 INTP0/EXLVI Port 12.
BE MODIFIED OR ALTERED WITHOUT PERMISSION FROM THE ACTUAL CIRCUIT USED. THIS WAY, 2. Voltages are DC-measured with a digital voltmeter FROM THE LG CORPORATION. ALL COMPONENTS IMPLEMENTATION OF THE LATEST SAFETY AND during Play mode. 1. SMPS SCHEMATIC DIAGRAM...