LG BH4120SN Service Manual Download Page 50

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2-41

2. AMP POWER SUPPLY ON SMPS BOARD

ELECTRICAL TROUBLESHOOTING GUIDE

No 14 VA.

No 31.5 V / 25 V

Power Line of MAIN PCB is short.

Power Line of MAIN or AMP PCB is short.

Is F901 normal?

Is the P-CTL normal?

Is TH901 normal?

Is the VCC (11 V ~ 25 V) supplied to IC901 pin7?

Is BD901 normal?

Is IC901 normal?

Is the VCC (11 V ~ 25 V) supplied to IC901 pin5?

Is Q902 normal?

Is D955 normal?

Replace F901. (same fuse)

Check the MICOM IC.

Replace TH901.

Is Q901 normal?

Check or replace Q901.

Replace BD901.

Replace IC901.

Is D953 normal?

Replace Q902.

Replace D955.

Check or replace D953.

YES

Summary of Contents for BH4120SN

Page 1: ... Cinema System SERVICE MANUAL MODEL BH4120SN BH4120SN S42S2 S S42S1 W CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL Website http biz lgservice com Internal Use Only MODEL BH4120SN BH4120SN S42S2 S S42S1 W SERVICE MANUAL ...

Page 2: ...1 1 CONTENTS SECTION 1 SUMMARY SECTION 2 ELECTRICAL SECTION 3 CABINET MAIN CHASSIS SECTION 4 MT8560 F E LOADER PART SECTION 5 REPLACEMENT PARTS LIST ...

Page 3: ...T SAFETY SERVICING GUIDELINES FOR BD HTS PRODUCTS 1 3 SERVICING PRECAUTIONS 1 4 GENERAL SERVICING PRECAUTIONS INSULATION CHECKING PRODEDURE ELECTROSTATICALLY SENSITIVE ES DEVICES HIDDEN KEY MODE 1 5 SOFTWARE UPGRADE 1 6 SPECIFICATIONS 1 7 ...

Page 4: ...or sharp solder points Be certain to remove all loose foreign par ticles 4 Check for physical evidence of damage or deterioration to parts and compo nents for frayed leads or damaged insulation including the AC cord and replace if necessary 5 No lead or component should touch a high current device or a resistor rated at 1 watt or more Lead tension around protruding metal surfaces must be avoided 6...

Page 5: ...tal panels Input terminals Earphone jacks etc Electrostatically Sensitive ES Devices Some semiconductor solid state devices can be damaged easily by static electricity Such components commonly are called Electrostatically Sensitive ES Devices Examples of typical ES devices are integrated circuits and some field effect transistors and semiconductor chip components The following techniques should be...

Page 6: ...ON KEY VERSION DISPLAY DEBUG INFORMATION NO DISC OPEN Highlight on 16 9 Full of setup menu 4 5 6 2 5 8 0 ENTER RETURN PAUSE 1 PLATFORM INFORMATION 2 HDMI CONNECTTON INFORMATION 3 WIRELESS INFORMATION EEPROM INITIAL POWER ON STATUS Front STOP RMC 0 for 5s Auto exit E2P CLEAR DOOR LOCK DVD FUNCTION and POWER ON STATUS Front STOP RMC STOP for 5s Toggling Locked display for 3s WIRELESS SPK REMATE POWE...

Page 7: ...ith a file that is named to LG_HB_7000M51 ROM Insert a upgrading disc or USB Show help message for disc upgrade as follows Press Enter key to upgrade Press Enter key to upgrade and it will show progress information After completing upgrade then power is off ...

Page 8: ...9 pin Type A HDMI Connector ANALOG AUDIO IN 2 0 Vrms 1 kHz 0 dB 600 Ω RCA jack L R x 1 PORT IN 0 5 Vrms 3 5 mm stereo jack TUNER FM Tuning Range 87 5 to 108 0 MHz or 87 50 to 108 00 MHz AMPLIFIER Power output 3 Ω 4 Ω RMS THD 10 Total 330 W Front 42 W x 2 Center 42 W Rear 42 W x 2 Sub Woofer 120 W Passive SYSTEM Laser Semiconductor laser Wavelength 405 nm 650 nm Signal system Standard PAL NTSC colo...

Page 9: ...2 W Max Input power 84 W Net Dimensions W x H x D 92 5 x 115 x 79 mm Net Weight 0 39 kg Center speaker Type 1 Way 1 speaker Impedance Rated 3 Ω Input Power 42 W Max Input power 84 W Net Dimensions W x H x D 92 5 x 115 x 79 mm Net Weight 0 39 kg Subwoofer Type 1 Way 1 speaker Impedance Rated 4 Ω Input Power 120 W Max Input power 240 W Net Dimensions W x H x D 156 x 325 x 320 mm Net Weight 3 6 kg De...

Page 10: ...HDMI OUTPUT 2 46 WAVEFORMS 2 47 1 SYSTEM PART 1 2 47 2 SYSTEM PART 2 SYSTEM MEMORY 2 48 3 VIDEO PART 100 FULL COLOR BAR 2 49 4 AUDIO PART I2S 2 49 5 HDMI PART 2 50 WIRING DIAGRAM 2 53 BLOCK DIAGRAM 2 55 CIRCUIT DIAGRAMS 2 57 1 SMPS POWER CIRCUIT DIAGRAM 2 57 2 MAIN CPU CIRCUIT DIAGRAM 2 59 3 MAIN MEMORY CIRCUIT DIAGRAM 2 61 4 MAIN LOADER CIRCUIT DIAGRAM 2 63 5 MAIN MICOM CIRCUIT DIAGRAM 2 65 6 MAI...

Page 11: ...e issue is a problem with the disc Multiple discs displaying the problem could indicate the BD lens needs to be cleaned Recommend the customer use a lens cleaner on the BD A lens cleaner is available at any local electronics retailer Do lines appear when watching a TV program NO YES Lines appearing when watching a TV program indicates an issue with the display If the TV program is fine then connec...

Page 12: ...ner is available at any local electronics retailer Do lines appear when watching a TV program NO YES Ghosting appearing when watching a TV program indicates an issue with the display If the TV program is fine then connect theBD to another input on the display to determine if the problem is following the BD Does ghosting appear when the BD is connected to another TV NO YES Connect the BD to another...

Page 13: ...ner is available at any local electronics retailer Does rolling appear when watching a TV program NO YES Rolling appearing when watching a TV program indicates an issue with the display If the TV program is fine then connect the BD to another input on the display to determine if the problem is following the BD Does rolling appear when the BD is connected to another TV NO YES Connect the BD to anot...

Page 14: ...ner is available at any local electronics retailer Does shaking appear when watching a TV program NO YES Shaking appearing when watching a TV program indicates an issue with the display If the TV program is fine then connect the BD to another input on the display to determine if the problem is following the BD Does shaking appear when the BD is connected to another TV NO YES Connect the BD to anot...

Page 15: ...s available at any local electronics retailer Does blurriness appear when watching a TV program NO YES Blurriness appearing when watching a TV program indicates an issue with the display If the TV program is fine then connect the BD to another input on the display to determine if the problem is following the BD Does blurriness appear when the BD is connected to another TV NO YES Connect the BD to ...

Page 16: ...t Turn TV off then on to determine input Video when using composite or component DVI when using DVI and HDMI when using HDMI Is the customer able to watch TV programming NO YES If the customer is not able to watch television then he may have a problem with his television especially if the cable signal comes through on a different input If the customer can not get a TV program then he still may hav...

Page 17: ... composite or component DVI when using DVI and HDMI when using HDMI Is the customer able to watch TV programming NO YES If the customer is not able to watch television then he may have a problem with his television especially if the cable signal comes through on a different input If the customer can not get a TV program then he still may have a problem with the particular input on his TV Can the c...

Page 18: ...omponent DVI when using DVI and HDMI when using HDMI Is the customer able to watch TV programming NO YES If the customer is not able to watch television then he may have a problem with his television especially if the cable signal comes through on a different input If the customer can not get a TV program then he still may have a problem with the particular input on his TV Can the customer connect...

Page 19: ...ct input Turn TV off then on to determine input Video when using composite or component DVI when using DVI and HDMI when using HDMI Is the customer able to watch TV programming NO YES If the customer is not able to watch television then he may have a problem with his television especially if the cable signal comes through on a different input If the customer can not get a TV program then he still ...

Page 20: ...mpliant NO YES Make sure the display is HDCP compliant when using a DVI or HDMI connection A lack of HDCP compliancy on the display may cause an invalid format or format not supported message to appear It can also cause a copy protection OSD to appear Has the customer tried the device on another display NO YES Ask the customer to connect the device to another display If the device starts working t...

Page 21: ...playable discs in the owners manual Multiple discs displaying the problem indicates a problem with BD HTS Does color appear when watching a TV program NO YES If the cable or satellite programming is connected through another input and the customer does not get color the customer has a problem with his television If a TV program does have the color the problem may be BD HTS the cables being used or...

Page 22: ...h the BD by checking playable discs in the owners manual Multiple discs displaying the problem indicates a problem with BD HTS Is color fine when watching a TV program NO YES If the cable or satellite programming is connected through another input and the customer does not get color the customer has a problem with his television If a TV program does have the color the problem may be BD HTS the cab...

Page 23: ... multiple discs could indicate a lens cleaner is needed The customer can purchase a lens cleaner at any electronics retailer Problem occur when watching TV program NO YES No audio from a TV program on a different channel or input means there is a problem with the television If a TV program does have the audio the problem may be BD HTS the cables being used or the TV itself Does the problem occur w...

Page 24: ...tiple discs could indicate a lens cleaner is needed The customer can purchase a lens cleaner at any electronics retailer Problem occur when watching TV program NO YES Distorted audio from a TV program on a different channel or input means there is a problem with the television If a TV program does have the audio the problem may be BD HTS the cables being used or the TV itself Does the problem occu...

Page 25: ...ed multiple tapes and discs NO YES YES If the issue only shows up on one disc then the problem is with that disc Have the customer try multiple tapes or discs If the issue happens on multiple discs and tapes then ask the customer to try a lens or a head cleaner Has the customer connected to another TV NO Ask the customer to connect the product to another TV If the issue persists try another set of...

Page 26: ... unit plugged into a surge protector NO YES Make sure the surge protector is plugged into a wall outlet Also make sure the surge protector is turned on or does not need to be reset due to a recent surge Does the unit work when plugged into another outlet NO YES Test the unit in another outlet If the unit works then the problem is the outlet where the unit was connected If the issue is the BD then ...

Page 27: ...e customer initialized a DVD RW in VR mode make sure the owners manual has the RW logo to show compatibility for the VR format Did the customer burn the disc in a computer NO YES Make sure the customer burned a compatible format such as VCD SVCD or DivX Make sure the file meets the specifications required for BD HTS to play the disc Check the owners manual for specifications Disc may still not be ...

Page 28: ...en reset the unit by unplugging it for 15 to 30 seconds If the unit does not respond after the reset arrange for service on the BD Does the open close button on the unit work NO YES Press the open close button on the unit If the disc ejects troubleshoot the remote using the Remote Control Not Working call flow Has the customer reset the unit NO Ask the customer to reset the unit by unplugging the ...

Page 29: ...teries are new and fresh The batteries do not need to come from a spare battery drawer Do not mix used and new batteries Is the remote working at all NO YES YES If the remote does not work anything then walk the customer through a remote drain Remove the batteries from the remote control Then press and hold any button down for a minute This will drain the power out of the remote and reset it Unive...

Page 30: ...omer initialized a DVD RW in VR mode make sure the owners manual has the RW logo to show compatibility for the VR format Did the customer burn the disc in a computer NO YES Make sure the customer burned a compatible format such as VCD SVCD or DivX Make sure the file meets the specifications required for BD HTS to play the disc Check the owners manual for specifications Disc may still not be compat...

Page 31: ...itialized a DVD RW in VR mode make sure the owners manual has the RW logo to show compatibility for the VR format Did the customer burn the disc in a computer NO YES Make sure the customer burned a compatible format such as VCD SVCD or DivX Make sure the file meets the specifications required for BD HTS to play the disc Check the owners manual for specifications Disc may still not be compatible Re...

Page 32: ...e of the DVD disc is not 1 then the DVD disc will not play on a HTS sold in the US BD HTS can play only DVD discs labeled same as the rear of the unit Is the disc locking up on a disclaimer screen when the customer presses play NO The disc locking up on a feature needs to be reported to Q E See instructions on reporting problems to Q E For a work around the problem advise the customer to access th...

Page 33: ...ke sure BD HTS aspect ratio is set to the appropriate setting depending on the aspect ratio of the TV If the customer chose 4 3 Letterbox then bars will appear on the top and bottom The customer can choose the panscan setting to get rid of the bars What is the resolution of BD HTS set at NO YES Try changing the resolution to 480p 720p 1080i and 1080p resolution require a widescreen aspect ratio wh...

Page 34: ...ected discs will not upconvert when HDCP is not found on the input or output Is the customer using an HDMI to DVI cable NO YES Regular discs can convert to 1080p over the HDMI output and only the HDMI output The TV has to have HDCP compliancy on the HDMI input The display has to accept the resolution 480p 720p 1080i or 1080p Is the customer using an HDMI or DVI cable NO YES Some movie companies wi...

Page 35: ...th interactive BD movie menu BD HTS can support BD2 0 so that network function is active in the BD disc Also BD HTS can support VOD service such as Netflix USA only Why is not the item downloaded through the network Make sure the customer insert the LAN cable into the Ethernet jack Make sure the network is active If it is active the disc may have a problem If not active see the network section of ...

Page 36: ... 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 Service hint Any picture Remark SMPS board top view No Power BD901 is Defective No Power F901 is Defective S W Error IC901 IC902 are Defective Fuse F901 Can look at the physical condition ...

Page 37: ...3 8 VA abnormal Check D918 and replace it Case 5 All Voltage abnormal Check IC902 and replace it 1 2 3 Service hint Any picture Remark FLD No Power D950 is Defective Vkk No Power D951 is Defective V ZD95 6 3 VA No Power D952 is Defective 13 VA No Power D953 is Defective No Power D911 is Defective ONE POINT REPAIR GUIDE SMPS board top view CASE 4 CASE 4 CASE 3 CASE 3 CASE 1 CASE 1 CASE 5 CASE 5 CAS...

Page 38: ...isplay on front panel and it will not boot up 2 1 D101 NO 3 3 VA 2 1 1 Solution Replace D101 on MAIN board 2 1 2 How to troubleshoot Countermeasure 1 Please check 3 8 VA yellow signal 2 If 3 8 VA is abnormal please check SMPS board 3 If 3 8 VA is OK but 3 3 VA is abnormal replace D101 2 1 3 Service hint Any picture Remark MAIN board top view D101 D101 D101 B 3 3 VA A 3 8 VA ...

Page 39: ...3 8 VA please check 3 8 VA from SMPS board For the solution please back to the solution 1 3 If 3 8 VA input is normal first of all check DCDC3 3_CTRL is high IC101 pin58 If DCDC3 3_CTRL is high check R148 R1H0 and if there s no defective component then replace IC151 4 If DCDC3 3_CTRL isn t high you may need to replace IC101 5 After changing it if the set is still not booting Refer to the next page...

Page 40: ...t check IC155 pin2 VCC 14 VA 3 If VIN pin2 of IC155 is not 14 VA First check CN150 and if there s no defective component please check SMPS board 4 After fixing it if the set is still not booting Check L1E4 and finally check IC155 or replace 5 After fixing it if the set is still not booting Refer to the next page for checking another power source 3 3 V 1 5 V Check Crystal X501 refer to item 2 5 Che...

Page 41: ...out check IC150 pin13 VCC 14 VA 3 If VIN pin13 of IC150 is not 14 VA First check CN150 and if there s no defective component please check SMPS board 4 After fixing it if the set is still not booting Check L1EO and finally check IC150 or replace 5 After fixing it if the set is still not booting Refer to the next page for checking another power source 3 3 V 1 2 V Check Crystal X501 refer to item 2 5...

Page 42: ...1 on MAIN board 2 5 2 How to troubleshoot Countermeasure 1 Please check the soldering status of 27 MHz crystal X501 2 Please check the frequency of 27 MHz crystal X501 3 If the crystal doesn t oscillate replace X501 4 After changing it if the set is still not booting Check NAND Flash IC IC504 refer to item 2 6 Check DDR IC IC502 IC503 refer to item 2 7 Check MT8560 IC IC501 refer to item 2 8 2 5 3...

Page 43: ...ution Replace IC504 on MAIN board 2 6 2 How to troubleshoot Countermeasure 1 Please check physical status of IC504 on your eyes 2 Check the VCC 3 3 V of IC504 and if it s normal please replace IC504 Please make sure IC504 has proper program 3 After changing it if the set is still not booting Check DDR IC IC502 IC503 refer to item 2 7 Check MT8560 IC IC501 refer to item 2 8 2 6 3 Service hint Any p...

Page 44: ...n MAIN board 2 7 2 How to troubleshoot Countermeasure 1 Please check 0 75 V of DDR3_VREF C545 Please check 1 5 V of C523 2 If it doesn t work even though IC150 IC155 IC151 IC101 are no problem IC502 IC503 DDR memory could have problem 3 After changing it if the set is still not booting Check MT8560 IC IC501 refer to item 2 8 Check MAIN board refer to item 2 9 2 7 3 Service hint Any picture Remark ...

Page 45: ...to troubleshoot Countermeasure 1 Please check 1 2 V Please check 3 3 V Please check 1 5 V Please check RESET IC101 pin73 2 If it doesn t work even though 1 2 V 1 5 V 3 3 V power and RESET are no problem IC501 MT8560 could have problem 3 If RESET isn t high you may need to replace IC101 4 After changing it if the set is still no booting check MAIN board refer to item 2 9 2 8 3 Service hint Any pict...

Page 46: ...t up 2 9 MAIN BOARD 2 9 1 Solution Replace MAIN board 2 9 2 How to troubleshoot Countermeasure 1 Please remove IC501 IC504 and then check the Impedance between each signal DATA ADDRESS and so on 2 If there is some Impedance a few Ω or infinite Ω especially power source trace PCB via might be bro ken You d better replace MAIN board 2 9 3 Service hint Any picture Remark MAIN board bottom view IC501 ...

Page 47: ...omponent output is OK 3 1 JK803 HDMI JACK 3 1 1 Soulution Replace JK803 HDMI jack 3 1 2 How to troubleshoot Countermeasure 1 Check JK803 pin soldering 2 If there is short soldering on pin JK803 re soldering pin JK803 3 If problem still occurs check CF809 CF812 R8A5 R8A9 R8C0 R8C2 If issue still NG replace IC501 3 1 3 Service hint Any picture Remark MAIN board bottom view JK803 ...

Page 48: ...1 Check voltage at CN601 If 36 V 14 VA 3 8 VA voltage doesn t come out re soldering pin CN601 2 Check voltage at IC700 IC701 If 36 V 12 V voltage doesn t come out check IC600 and SMPS board 3 Check the AMP_SD signal of pin22 at CN600 If this pin is low replace IC700 IC701 4 If problem still occurs replace AMP board 4 1 3 Service hint Any picture Remark AMP board top view 3 8 VA 14 VA IC600 36 V CN...

Page 49: ...01 normal Is TH901 normal Is BD901 normal Is BD901 normal Is the VCC 11 V 25 V supplied to IC902 pin5 Is the VCC 11 V 25 V supplied to IC902 pin5 Replace F901 same fuse Replace F901 same fuse Replace TH901 Replace TH901 Replace BD901 Replace BD901 Is D918 normal Is D952 normal Check or replace D918 Check or replace D952 NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES YES YES YES YES ...

Page 50: ...al Is the VCC 11 V 25 V supplied to IC901 pin7 Is BD901 normal Is IC901 normal Is the VCC 11 V 25 V supplied to IC901 pin5 Is Q902 normal Is D955 normal Replace F901 same fuse Check the MICOM IC Replace TH901 Is Q901 normal Check or replace Q901 Replace BD901 Replace IC901 Is D953 normal Replace Q902 Replace D955 Check or replace D953 NO NO NO NO NO NO NO NO NO YES YES YES YES YES YES YES YES YES ...

Page 51: ...e VCC 6 VA supplied to IC153 pin2 Is there H signal at IC153 pin1 Check 6 VA on SMPS Board Check IC101 pin68 LDO_CTRL NO NO YES YES YES No 1 2 V Check IC155 and replace Is the VCC 14 VA supplied to IC155 pin2 Is there 1 2V at IC155 pin8 Check 14 VA on SMPS Board Check IC101 pin68 LDO_CTRL NO NO YES YES YES No 1 5 V Check IC150 and replace Is the VCC 14 VA supplied to IC150 pin13 Is there 1 5 V at ...

Page 52: ...nitor OK LG Logo display on monitor oK IC101 3 3VA_MICOM 3 3 V OK IC501 VCC 1 2 V 1 5 V 3 3 V OK 3 3V FL FL OK X101 20 000 MHz OK X501 27 000 MHz OK IC504 NF_ALE NF_CLE OK VFD_STB VFD_CLK VFD_RX OK Check D101 and SMPS board Check IC155 IC150 IC151 and SMPS board Check Q303 Q308 and SMPS board Replace X101 Replace X501 Replace IC504 NAND Flash Assemble properly Check IC101 and CN305 NO NO NO NO NO ...

Page 53: ...01 s VCC or replace IC501 NO YES YES 6 NO AUDIO OUTPUT BD CD DVD disc or USB play YES 6A Replace AMP PCB CN401 pin11 12 15 signal OK R623 R624 signal OK CN600 pin24 22 18 17 16 signal OK IC700 pin35 39 signal OK Check IC501 s I2S output trace Check IC602 s I2S output trace Check IC101 s signal trace Check IC700 or replace IC700 IC701 NO NO NO NO YES YES YES YES ...

Page 54: ... pin4 6 audio L R OK TUN01 pin1 2 3 4 signal OK IC200 pin43 42 41 signal OK TUN01 pin7 8 audio L R OK IC200 pin42 signal OK Check CN251 and JACK PCB Check IC101 or replace Check IC200 or replace Check TUN01 or replace Check IC200 or replace NO NO NO NO NO YES YES YES YES YES YES YES ...

Page 55: ... JK803 pin19 HPD about 3 3 V OK JK803 pin18 VCC 5 V OK Is there signal on R841 R842 Is there signal on TMDS Replace JK803 Check L803 and VCC 5 V line Check hot plug detect signal from TV Check I2C trace from IC501 Check TMDS trace from IC501 NO NO NO NO NO YES YES YES YES YES YES 7 NO HDMI OUTPUT ...

Page 56: ...2 47 WAVEFORMS IC501 MT8560 X TAL 27 MHz 1 1 7 8 10 9 1 SYSTEM PART 1 ...

Page 57: ...2 48 WAVEFORMS 2 SYSTEM PART 2 SYSTEM MEMORY IC501 MT8560 BA0 2 IC501 MT8560 WE 3 IC501 MT8560 CAS 4 IC501 MT8560 CK 5 4 3 2 5 ...

Page 58: ...2 49 WAVEFORMS CVBS 6 3 VIDEO PART 100 FULL COLOR BAR 6 tjsr ijr syjr kh hW tjsr ijr syjr kh hW 7 8 9 10 4 AUDIO PART I2S 7 8 10 9 ...

Page 59: ...2 50 WAVEFORMS H_SDA H_SCL 11 12 5 HDMI PART 12 11 ...

Page 60: ...2 51 WAVEFORMS HDMI_CLK_N 13 13 12 11 14 HDMI_0_N 14 JK803 ...

Page 61: ...2 52 ...

Page 62: ...RNESS FFC S M D S M D 14 PIN SMD ST 2mm CN150 24 PIN SMD ST 1mm SMD SMD Female CN902 18 PIN SMD ST 1 mm CN250 18 PIN SMD ANG 1 mm CN251 45 PIN SMD ST 0 5 mm CN703 SMD SMD SMD 8 PIN SMD ST 1 mm 5 PIN SMD ST 1 mm CN704 S M D 8 PIN DIP ST Male CN401 14 PIN SMD ST 2 54mm CN202 CN305 CN600 CN601 CN901 CN701 MD FR 1 PHENOL 2 53 2 54 ...

Page 63: ...COM 1100W 1165 300W 1164 NEC 100P 1 2 1 5 3 3V X1 I2S 6ch D0 D1 D2 19 2 MHz HDMI OUT TMDS TMDS 12C DDC HPD I2C Pickup 45P FFC MD OPU 8P MOTOR 5P SLOT 4P TRAY RF A B C D E F D D 5 V VFD MC3401 VFD MC3401 SPI UART I2C SDA SCL I2S 2ch D3 Motor Driver 9ch TPIC2050 TACT 2ch ADC CS5346 Portable Tuner USBx1 AUX CVBS 2 55 2 56 ...

Page 64: ...2 2 2011 12 27 Warning Parts that are shaded are critical with respect to risk of fire or electrical shock IMPORTANT SAFETY NOTICE WHEN SERVICING THIS CHASSIS UNDER NO CIRCUMSTANCES SHOULD THE ORIGINAL DESIGN BE MODIFIED OR ALTERED WITH OUT PERMISSION FROM THE LG CORPORATION ALL COMPONENTS SHOULD BE REPLACED ONLY WITH TYPES IDENTICAL TO THOSE IN THE ORIGINAL CIRCUIT SPECIAL COMPONENTS ARE SHADED O...

Page 65: ...WAVEFORM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T CPU EAX64508371 2 REV1 0 0 2011 12 27 4 3 2 5 1 7 8 10 9 2 59 2 60 2 MAIN CPU CIRCUIT DIAGRAM ...

Page 66: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MEMORY EAX64508371 3 REV1 0 0 2011 12 27 2 61 2 62 3 MAIN MEMORY CIRCUIT DIAGRAM ...

Page 67: ...4 MAIN LOADER CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T LOADER EAX64508371 4 REV1 0 0 2011 12 27 2 63 2 64 ...

Page 68: ...5 MAIN MICOM CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T MICOM EAX64508371 5 REV1 0 0 2011 12 27 2 65 2 66 ...

Page 69: ...6 MAIN HDMI CIRCUIT DIAGRAM WAVEFORM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T HDMI EAX64508371 6 REV1 0 0 2011 12 27 13 12 11 14 2 67 2 68 ...

Page 70: ...7 MAIN ADC DIR CIRCUIT DIAGRAM WAVEFORM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T ADC DIR EAX64508371 7 REV1 0 0 2011 12 27 7 2 69 2 70 ...

Page 71: ...8 MAIN DSP CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T DSP EAX64508371 8 REV1 0 0 2011 12 27 2 71 2 72 ...

Page 72: ...9 MAIN POWER CIRCUIT DIAGRAM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T POWER EAX64508371 9 REV1 0 0 2011 12 27 2 73 2 74 ...

Page 73: ...WAVEFORM A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T IO EAX64508371 10 REV1 0 0 2011 12 27 6 10 MAIN I O CIRCUIT DIAGRAM 2 75 2 76 ...

Page 74: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T PWM AMP EAX64603202 1 REV1 0 0 2012 01 10 11 PWM AMP CIRCUIT DIAGRAM 2 77 2 78 ...

Page 75: ...A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T JACK USB PTB EAX64562101 Rev1 1 1 2011 12 27 2 79 2 80 12 JACK CIRCUIT DIAGRAM ...

Page 76: ...13 FRONT CIRCUIT DIAGRAM 2 81 2 82 A 1 2 3 4 5 6 7 8 9 10 11 12 B C D E F G H I J K L M N O P Q R S T FRONT EAX64672601 REV1 4 4 2012 01 10 ...

Page 77: ...TTOM 2 VIN 6 77 3 VOUT 5 25 IC155 AOZ1051 3A BOTTOM 2 VIN 12 79 9 LX 5 31 IC156 LM27152 BOTTOM 2 IN 12 2 4 OUT 12 08 Pin No Desc Voltage EE Mode IC200 CS5346 TOP 5 VLC 3 279 14 VA 4 99 36 VLS 3 28 46 VD 3 278 IC201 CS8422 TOP 3 VA 3 324 21 VL 3 332 IC501 MT8560 BOTTOM E16 VDD33 3 355 0 C12 VDD33 3 355 0 D21 VDD33 3 355 0 E22 VDD33 3 355 0 T18 VDD15 1 518 0 J20 VDD15 1 518 0 K19 VDD15 1 518 0 N20 V...

Page 78: ... critical NOTES with respect to risk of fire or NOTES electricial shock NOTES Warning NOTES Parts that are shaded are critical NOTES with respect to risk of fire or NOTES electricial shock PRINTED CIRCUIT BOARD DIAGRAMS 1 SMPS P C BOARD TOP VIEW BOTTOM VIEW ...

Page 79: ...2 87 2 88 2 MAIN P C BOARD TOP VIEW BOTTOM VIEW ...

Page 80: ...3 AMP P C BOARD TOP VIEW BOTTOM VIEW 2 89 2 90 ...

Page 81: ...4 JACK P C BOARD 5 FRONT P C BOARD TOP VIEW BOTTOM VIEW 2 91 2 92 TOP VIEW BOTTOM VIEW ...

Page 82: ... CHASSIS CONTENTS EXPLODED VIEWS 3 3 1 CABINET AND MAIN FRAME SECTION 3 3 2 DECK MECHANISM SECTION BM15T1 IM11 3 5 3 PACKING ACCESSORY SECTION 3 7 4 SPEAKER SECTION 3 8 4 1 FRONT CENTER REAR SPEAKER 3 8 4 2 PASSIVE SUBWOOFER 3 9 ...

Page 83: ...3 2 ...

Page 84: ...T AND MAIN FRAME SECTION 465 320 A44 260 D B C A50 281 250 A43 465 462 261 261 AMP 462 462 A45 CABLE1 G SMPS A46 A47 462 462 462 B C D F G E MAIN H E CN901 H 265 JACK A 462 A41 CABLE2 A 462 462 462 465 F 452 CABLE3 279 K 300 ...

Page 85: ...1026 1439 A001 1002 1005 1001 1030 1043 1045 A005 1016 1013 1015 1020 1003 1439 1018 1019 1011 1012 1035 1050 1049 1437 1025 1025 1024 1024 1437 A006 1004 2 DECK MECHANISM SECTION BM15T1 IM11 ...

Page 86: ...825 FM antenna 900 Remote control 804 Bag 832 CD title 803 Packing 802 Box Master 803 Packing 808 Battery 811 Video cable 801 Owner s manual 3 PACKING ACCESSORY SECTION ...

Page 87: ...A800 Front SPK A700 Center SPK A600 Rear SPK 4 SPEAKER SECTION 4 1 FRONT CENTER REAR SPEAKER ...

Page 88: ...A900 4 2 PASSIVE SUBWOOFER ...

Page 89: ......

Page 90: ...ALL CD DISC READING ERROR 4 4 HOW TO USE THE SA RESET FUNCTION 4 5 1 PURPOSE 4 5 2 REQUIRED SA RESET 4 5 3 SA RESET PROCEDURE 4 5 MAJOR IC INTERNAL BLOCK DIAGRAM AND PIN DESCRIPTION 4 7 1 IC501 MT8560 4 7 2 IC701 TPIC2050 9CH MOTOR DRIVE WITH 3 BEAM LASER DIODE DRIVER 4 10 3 PICK UP CONNECTOR TERMINAL PIN ASSIGNMENTS 4 12 BLOCK DIAGRAM 4 13 ...

Page 91: ...al set can not recognize BD disc 1 1 Component 1 MD Traverse Assembly 2 IC701 TPIC2050 CN703 1 2 How to troubleshoot Countermeasure 1 Check MD s cable s status Pick up Sled Spindle Tray Cable 2 Check power source of IC701 pin42 12 V pin24 9 5 V pin34 5 V 3 Check pin39 MON_BD of CN703 during BD single layer playback pin39 180 mV 1 3 Service hint Any picture Remark ...

Page 92: ...bnormal set can not recognize DVD disc 2 1 Component 1 MD Traverse Assembly 2 IC701 TPIC2050 CN703 2 2 How to troubleshoot Countermeasure 1 Check MD s cable s status Pick up Sled Spindle Tray Cable 2 Check power source of IC701 pin42 12 V pin24 9 5 V pin34 5 V 3 Check pin40 SEL_DVD of CN703 during DVD playback pin40 180 mV 2 3 Service hint Any picture Remark ...

Page 93: ...abnormal set can not recognize CD disc 3 1 Component 1 MD Traverse Assembly 2 IC701 TPIC2050 CN703 3 2 How to troubleshoot Countermeasure 1 Check MD s cable s status Pick up Sled Spindle Tray Cable 2 Check power source of IC701 pin42 12 V pin24 9 5 V pin34 5 V 3 Check pin41 SEL_CD of CN703 during DVD playback pin41 180 mV 3 3 Service hint Any picture Remark ...

Page 94: ...nging Traverse After changing Main Board Assembly After changing Main Board Flash IC 3 SA RESET PROCEDURE HOW TO USE THE SA RESET FUNCTION 1 Power on the set then mode is in home menu 2 Press Setup 3 Under DISPLAY highlighted condition press 5 1 7 7 7 7 7 Enter on the remote controller to display special mode Move to the SA IOP Reset and click G ...

Page 95: ...rt BD ROM SL Disc Tray is opened automatically 5 If the disc is inserted you will see Wait 6 If SA Adjustment is finished tray is opened auto matically 7 Press stop key twice to escape this special mode Reference ...

Page 96: ...e low The pin is spike free at power on stage Alternate function General IO R1 FEFG 3 3V LVTTL I O 5V tolerance 6 mA PDR 75K pull up 3 3 V Motor Hall sensor input The pin is spike free at power on stage N1 FEFMO Analog Output Feed motor 1 control DAC output M2 FEFMO2 Analog Output Feed motor 2 control DAC output N3 FEFMO3 Analog I O Feed motor 3 control DAC output Alternative Function Auxiliary se...

Page 97: ...R6 FEGIO4 Analog Output Read gain switch 4 Alternate function 1 LCD serial interface command enable 2 LCD_DRV Sqare wave output for LCD control 3 Internal monitored signal output 4 General IO N5 FEGIO5 Analog Output Read gain switch 6 Alternate function 1 SIDM 2 LCD serial interface command enable 3 Internal monitored signal output 4 General IO N7 FEGIO6 Analog Output Read gain switch 6 The pin is...

Page 98: ...ng RF SUM Signal Negative G1 RFIP Analog Input Differential Input of AC Coupling RF SUM Signal Positive H1 RFIP2 Analog Input Differential Input of AC Coupling RF SUM Signal Positive J3 TLO Analog Output Tilt servo output T2 FETRAYIN_ 3 3V LVTTL I O 5V tolerance 6 mA 75K pull up 3 3 V Tray_is_in Input A Logical Low Indicates the Tray is IN Feed back Flag is from Tray Connector The pin is spike fre...

Page 99: ...D END detection STEP END detection DAC PWM DAC PWM DAC PWM DAC PWM DAC PWM DAC PWM DAC PWM P5V P5V P12V int 3 3V Regulator A5V P5V int 10V Regulator Analog 5V DAC P12V SLD ENA TLT ENA DIFF TLT TEMPMON_ENA TRK ENA STP ENA SPM ENA power monitor SIOV 200k 200k SIOV 33k 19V LOAD ENA F B F B F B F B F B SLD ENA TPIC2050 On chip thermometer pre driver power FET pre driver power FET pre driver power FET ...

Page 100: ...l 27 ILDD_CD OUT Laser diode for CD output terminal 28 CP5V MISC The capacitance connection terminal for control system power supply 0 1uF or lager decoupling capacitor should be connected 29 LOAD_P OUT Load positive output terminal 30 LOAD_N OUT Load negative output terminal 31 P5V12L PS The power supply terminal 5V or 12V for Load driver output stages 32 TEST2 MISC Test pin Should be open 33 TES...

Page 101: ...F BD DVD CD RF 24 RF BD DVD CD RF 25 SW2 BD PD Gain2 26 SW1 BD PD Gain1 27 VREF_2 1V PDIC Reference 2 1V 28 VCC_PD 5V PDIC Power 5V 29 GND_PD PDIC GND 30 SW DVD CD Sleep Selection 31 GND LD HFM GND LD HFM IC Monitor 32 BD_LD LD Control BD 33 CD_LD LD Control CD 34 DVD_LD LD Control DVD 35 GND LD HFM GND 36 TEMP Thermistor 37 HFM_VCC 5V HFM VCC 38 CD DVD_MPD Monitor output DVD CD 39 BD_MPD Monitor ...

Page 102: ...3 BLOCK DIAGRAM OPU Ethernet 7 1 CH 2 CH S PDIF HDMI Component CVBS DVO Motor Driver USB NAND 1GB DDR3 256 384 MB Audio DAC MT8560 HD SD Decode 810 MHz ARM11 400 MHz Audio DSP x 3 HDMI 1 4 Ethernet Monitor ...

Page 103: ...4 14 MEMO ...

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Summary of Contents for BH4120SN

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LG BH4120SN, Service Manual, Page: 50 / 103

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Summary of Contents for BH4120SN

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