LG 37LK457C Service Manual Download Page 41

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Summary of Contents for 37LK457C

Page 1: ...MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only CHASSIS LB0EC MODEL 37LK457C 37LK457C TA CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL ...

Page 2: ...nc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLESHOOTING GUIDE 14 BLOCK DIAGRAM 22 EXPLODED VIEW 23 SCHEMATIC CIRCUIT DIAGRAM ...

Page 3: ...inals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on position connect one lead of ohm meter to the AC plug prongs tied together and touch other ohm meter lead in turn to each exposed m...

Page 4: ...lectrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharging wrist strap device which should be removed to prevent poten tial shock reasons prior to applying power to the unit under test 2 After removing an electrical assembly equipped with ES devices place the assembly on a conductive surface such as aluminum foil to prevent...

Page 5: ...he solder joints of the two original leads If they are not shiny reheat them and if necessary apply additional solder Fuse and Conventional Resistor Removal Replacement 1 Clip each fuse or resistor lead at top of the circuit board hollow stake 2 Securely crimp the leads of replacement component around notch at stake top 3 Solder the connections CAUTION Maintain original spacing between the replace...

Page 6: ...d 1 Performance LGE TV test method followed 2 Demanded other specification Safety CE IEC specification EMC CE IEC 4 Model General Specification No Item Specification Remarks 1 Market Austrailia New Zealand Singapore Malaysia Vietnam Indonesia South Africa Israel A ASIA only Analog for A ASIA 2 Broadcasting system 1 PAL SECAM B G D K 2 PAL I II 3 NTSC M 4 DVB T PAL for NZ SG 3 Receiving system Anal...

Page 7: ... 720p 9 1280 720 45 00 60 00 HDTV 720p 10 1920 1080 31 25 50 00 HDTV 1080i 11 1920 1080 33 75 60 00 HDTV 1080i 12 1920 1080 33 72 59 94 HDTV 1080i 13 1920 1080 56 250 50 HDTV 1080p 14 1920 1080 67 5 60 HDTV 1080p No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 720 400 31 468 70 08 28 321 For only DOS mode 2 640 480 31 469 59 94 25 17 VESA Input 848 480 60Hz 852 480 60Hz 640 4...

Page 8: ...TV 1080I 6 1920 1080 28 125 50 00 74 25 HDTV 1080I 7 1920 1080 26 97 27 23 97 24 74 17 74 25 HDTV 1080P 8 1920 1080 33 716 33 75 29 976 30 00 74 25 HDTV 1080P 9 1920 1080 56 250 50 148 5 HDTV 1080P 10 1920 1080 67 43 67 5 59 94 60 148 35 148 50 HDTV 1080P 7 2 PC Mode No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remarks 1 720 400 31 468 70 08 28 321 HDCP 2 640 480 31 469 59 94 25 17 ...

Page 9: ...Auto Detect and check OK message If Error is displayed check connection between computer jig and set 3 Click Read tab and then load download file XXXX bin by clicking Read 4 Click Connect tab If Can t is displayed check connection between computer jig and set 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message USB DOWNLOAD 1 Put the USB Stick to the USB socket 2 Auto...

Page 10: ...ADC Process 1 ADC Enter Service Mode by pushing ADJ key Enter Internal ADC mode by pushing key at 6 ADC Calibration Caution Using power on key of the Adjustment remote control power on TV ADC Calibration Protocol RS232 Adjust Sequence aa 00 00 Enter Adjust Mode xb 00 40 Component1 Input 480i ad 00 10 Adjust 480i Comp1 xb 00 60 RGB Input 1024 768 ad 00 10 Adjust 1024 768 RGB aa 00 90 End Adjust mod...

Page 11: ...y at 7 White Balance After you finished all adjustments Press In start key and compare Tool option and Area option value with its BOM if it is correctly same then unplug the AC cable If it is not same then correct it same with BOM and unplug AC cable For correct it to the model s module from factory Jig model Push the IN STOP key after completing the function inspection 4 2 DDC EDID Write RGB 128B...

Page 12: ...MI1 HDMI2 HDMI3 RGB NG NG NG NG Reset Start EDID D L Reset Start HDMI1 HDMI2 HDMI3 RGB OK OK OK OK NO Item CMD 1 CMD 2 Data 0 Enter download MODE Download Mode In A A 0 0 When transfer the Mode In Carry the command EDID data and Model option download Download A E 00 10 Automatically download The use of a internal data 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 0 ff ff ff ff ff ff 0 1e 6d a b 10 c 1 3 68 10...

Page 13: ... in production line because serial number D L is mandatory by D book 4 0 Manual Download Model Name and Serial Number If the TV set is downloaded by OTA or Service man sometimes model name or serial number is initialized Not always There is impossible to download by bar code scan so It need Manual download 1 Press the Instart key of Adjustment remote control 2 Go to the menu 6 Model Number D L lik...

Page 14: ... or Main board Check Multi Voltage P403 2pin 24V 17pin 12V Replace Power Board Check Inverter Control Error Out P403 18 pin High P403 24 pin low Check Power Board or Module Check IC402 3 7 Output Voltage IC402 2 5V IC403 1 1V IC407 1 5V Q403 3 3V Replace IC402 3 7 Q403 Re download software Check Micom Voltage L404 3 5V Replace L404 Check LVDS Power Voltage Q409 12V Replace Q409 Check Mstar LVDS Ou...

Page 15: ...gnal TU3700 10 11 Pin Replace IC3703 Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok ok ok ok No No No No Bad Tuner Replace Tuner 2 Digital TV Video 3 Analog TV Video Check RF Cable Signal Check Tuner 3 3V Power L3703 Replace L3703 Check Tuner 1 8V Power IC3703 2 pin 1 8V Check CVBS Signal TU3700 8 Pin Replace IC3703 Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok ok ok o...

Page 16: ...04 JK9901 CVBS Signal Line R246 R4016 ok ok ok No Replace Jack ok Check CVBS_DET Signal Replace R9915 or R1666 No Check Mstar LVDS Output Replace Mstar IC101 or Main Board No Check input signal format Is it supported Check Component Cable for damage or open conductor Check JK1601 or 1603 Y PB PR signal Line ok ok ok No Replace Jack Check COMP_DET Signal Replace R1614 R4223 or R1615 No Check Mstar ...

Page 17: ...rmat Is it supported Check RGB Cable conductors for damage or open conductor Check EDID I2C Signal R138 R139 SDA SCL Check JK1104 H V_Sync R G B Signal Line ok ok ok No No re download EDID data Replace Mstar IC101 or Main Board ok Replace Jack Check DSUB_DET Replace R1146 or R1147 No Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok No ...

Page 18: ... EDID R4033 R4034 R4035 R4036 R4037 R4038 I2C Signal Check JK801 JK802 JK803 ok ok ok No No Replace the defective IC or re download EDID data Check HDCP EEPROM IC103 Power I2C Signal Replace the defective IC ok No Replace Jack Check HDMI Signal Check other set If no problem check signal line ok No Check Mstar LVDS Output Replace Mstar IC101 or Main Board ok No Replace Main Board No Check HDMI_DET ...

Page 19: ... Check Connector P501 Replace connector if found to be damaged ok No Check speaker resistance and connector damage Replace speaker ok No Off Toggle the Menu Check AMP IC IC501 Power 24V or 20V or 15V 3 3V No Replace Amp IC IC501 Check Mstar I2S Output IC501 9 10 11 Pin No Check signal line Or replace Mstar IC101 Check Mstar AUDIO_MASTER_CLK R148 No Replace Mstar IC101 or Main Board ok Check AMP I2...

Page 20: ...Power L3703 Replace L3703 Check Tuner 1 8V Power IC3703 2 pin 1 8V Check IF_P N Signal TU3700 10 11 Pin Replace IC3703 ok ok ok No No No Bad Tuner Replace Tuner Check RF Cable Signal Follow procedure 8 All source audio trouble shooting guide ok Check Tuner 3 3V Power L3703 Replace L3703 Check Tuner 1 8V Power IC3703 2 pin 1 8V Check CVBS Signal TU3700 8 Pin Replace IC3703 ok ok ok No No No Bad Tun...

Page 21: ...ace Jack Follow procedure 8 All source audio trouble shooting guide 12 Component Audio Check Component Cable for damage or open conductor Check JK1601 JK1603 Signal Line ok ok No Replace Jack Follow procedure 8 All source audio trouble shooting guide 13 RGB Audio Check Cable conductors for damage or open conductor Check JK1102 Signal Line ok No ok Replace Jack Follow procedure 8 All source audio t...

Page 22: ...P b Pr COMP_DET COMP_L R_IN TUNER TU_CVBS SIF TU_SCL SDA IF_N P_MSTAR RS232C PM_RXD TXD MAX3232CDR IC1101 IR IR KEY1 2 SoftTouch_SCL SDA SENSOR_SCL S DA LED_B R Tact HDCP EEPROM I2C_SCL SDA IC104 EEPROM I2C_SCL SDA Serial Flash SPI_CS SCK SDO SPI_SDI NAND FLASH PCM_A 0 7 DDR3 SDRAM A_DDR3_A 0 14 B_DDR3_A 0 14 A_DDR3_DQL 0 7 A_DDR3_DQU 0 7 B_DDR3_DQL 0 7 B_DDR3_DQU 0 7 USB USB_DM DP LVDS RXA 0 3 CK...

Page 23: ...electrical and mechanical parts in this chassis have special safety related characteristics These parts are identified by in the Schematic Diagram and EXPLODED VIEW It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent X RADIATION Shock Fire or other Hazards Do not modify the original design without permission of manufa...

Page 24: ...122 W22 PCMADR 3 GPIO121 AB18 PCMADR 4 GPIO99 AA20 PCMADR 5 GPIO101 AA21 PCMADR 6 GPIO102 Y19 PCMADR 7 GPIO103 AB17 PCMADR 8 GPIO108 Y16 PCMADR 9 GPIO110 AB19 PCMADR 10 GPIO114 AB20 PCMADR 11 GPIO112 AA16 PCMADR 12 GPIO104 AA19 PCMADR 13 GPIO107 AC21 PCMADR 14 GPIO106 AA17 PCMREG_N GPIO123 Y20 PCMOE_N GPIO113 AB15 PCMWE_N GPIO197 AA22 PCMIORD_N GPIO111 AD22 PCMIOWR_N GPIO109 AD20 PCMCE_N GPIO115 A...

Page 25: ...N0M M2 SOGIN0 M1 HSYNC1 V2 VSYNC1 V3 RIN1P U3 RIN1M U2 GIN1P T1 GIN1M T2 BIN1P R2 BIN1M R1 SOGIN1 T3 HSYNC2 AA2 RIN2P Y2 RIN2M AA3 GIN2P W2 GIN2M Y3 BIN2P V1 BIN2M W3 SOGIN2 W1 CVBS0 AA8 CVBS1 Y4 CVBS2 W4 CVBS3 AA5 CVBS4 Y5 CVBS5 AA4 CVBSOUT0 Y6 CVBSOUT1 AA1 VCOM AB4 VIFP AC4 VIFM AD3 IP AC3 IM AE3 SIFP AD4 SIFM AC5 IF_AGC AD2 RF_AGC AE2 I2C_SCKM1 GPIO75 AE6 I2C_SDAM1 GPIO76 AD6 XIN AD1 XOUT AC1 S...

Page 26: ...L407 10uF 10V C430 3 3V_Normal 0 1uF 16V C490 5V_TUNER 33K R439 AP1117EG 13 IC410 5V_TUNER ADJ GND OUT IN 1 10W 1 21K 1 R447 PD_ 12V RL_ON 0 1uF 16V C417 5V_TUNER 1 R473 FM20020 24 P404 NORMAL_32 19 14 9 4 18 13 8 3 17 12 7 2 16 11 6 1 20 15 10 5 21 22 23 24 25 110 R417 5V_TUNER 3K R405 1 PANEL_DISCHARGE_RES 0 1uF 16V C408 OPT 0 1uF 16V C412 PD_ 12V 10K OPT R446 22K R435 OPT PANEL_VCC 0 1uF 50V C4...

Page 27: ... SENSOR_SDA 3 3V_Normal 18pF 50V OPT C2409 0 R2427 12507WR 12L P2401 OLD_SUB 1 2 3 4 5 6 7 8 9 10 11 12 13 3 5V_ST 0 1uF 16V C2405 JP2410 22 R2428 10K 1 R2404 KEY1 47K R2426 IR 0 1uF 16V C2410 OPT KEY2 JP2409 100 R2401 12507WR 15L P2402 NEW_SUB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 16 15 100 R2411 EYEQ TOUCH_KEY 10K R2416 OPT BLM18PG121SN1D L2404 1000pF 50V C2406 2SC3052 Q2405 OPT E B C 10K R2430 OPT 1...

Page 28: ... EAN61849601 IC1450 3 IN_2 2 IN_1 4 EN 1 GND 5 FLG 6 OUT_1 7 OUT_2 8 NC CIS21J121 L1451 1 USB DOWN STREAM 3AU04S 305 ZC LG JK1450 USB_JACK 1 2 3 4 5 5V_USB 10uF 10V C1452 USB1_OCD SIDE_USB_DM 0 1uF C1453 1 8W 2K 1 R1458 1 8W 2K 1 R1459 USB DOWN STREAM 3AU04S 345 ZC H LG JK1450 1 USB_JACK_LV3400 1 2 3 4 5 4 7K OPT R1455 RCLAMP0502BA D1451 OPT SIDE_USB_DP 3 3V_Normal 22uF 16V C1451 47 R1451 20101023...

Page 29: ... R808 DDC_SDA_1 JP810 AT24C02BN SH T IC802 HDMI_2_ATMEL 3 A2 2 A1 4 GND 1 A0 5 SDA 6 SCL 7 WP 8 VCC 1 8K R804 5V_Normal R1EX24002ASAS0A IC801 1 HDMI_1_RENESAS 3 A2 2 A1 4 VSS 1 A0 5 SDA 6 SCL 7 WP 8 VCC 22 R877 10K R874 HDMI_1_EEPROM D2 _HDMI4 CK _HDMI2 0 1uF C806 EDID_WP EDID_WP 10K R806 D1 _HDMI2 DDC_SCL_1 ENKMC2838 T112 D822 A1 C A2 DDC_SDA_2 CK _HDMI4 JP806 AT24C02BN SH T IC801 HDMI_1_ATMEL 3 ...

Page 30: ... B C 3 5V_ST 1000pF 50V C1116 OPT 10uF 16V C1118 HEAD_PHONE 1K R1128 H P_EXT_SPK 3 3K R1129 HEAD_PHONE MMBT3904 F Q1102 HEAD_PHONE E B C 1K R1155 H P_EXT_SPK MMBT3904 F Q1101 HEAD_PHONE E B C 1K R1125 H P_EXT_SPK MMBT3904 F Q1103 HEAD_PHONE E B C ISA1530AC1 Q1105 HEAD_PHONE E B C HP_DET HP_LOUT 2 V7 HP_ROUT 2 V7 EXT_OUT_L AN23 SIDE_HP_MUTE MMBT3904 F Q1104 HEAD_PHONE E B C EXT_OUT_R AN22 3 3V_Norm...

Page 31: ...C1103 0 33uF C1101 0 1uF C1104 3 5V_ST CDS3C30GTH 30V OPT D1107 100 R1123 0 1uF C1105 0 1uF C1102 100 R1124 SPG09 DB 009 JK1101 1 2 3 4 5 6 7 8 9 10 JP1111 EAN41348201 MAX3232CDR IC1101 3 C1 2 V 4 C2 1 C1 6 V 5 C2 7 DOUT2 8 RIN2 9 ROUT2 10 DIN2 11 DIN1 12 ROUT1 13 RIN1 14 DOUT1 15 GND 16 VCC PM_TXD CDS3C30GTH 30V OPT D1108 BAP70 02 50V D1100 1K R1100 3 5V_ST IR_OUT 20110324 GP3_S7LR RS232C_9PIN 10...

Page 32: ...ER_FHD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 RXA2 RXA0 0 1uF 16V HD C703 RXB1 0 1uF 16V C710 WAFER_FHD FF10001 30 P705 HD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 RXB2 RXB4 RXA0 RXA1 RXA0 PANEL_VCC 1000pF 50V OPT C702 RXA3 10K OPT R711 120 ohm HD L...

Page 33: ...E2 VSSQ_6 E8 VSSQ_7 F9 VSSQ_8 G1 VSSQ_9 G9 0 1 u F C1203 B MVREFDQ 1K 1 R1227 0 1 u F C1228 A MWEB 0 1 u F C1248 B MCASB 0 1 u F C1222 0 1 u F C1215 A MA8 B MA6 B MVREFCA B MDQL5 B MCKE B MCKE A MRASB A MVREFCA A MDQL5 10uF C1205 B MA7 A MA0 A MDQU4 0 1 u F C1232 A MDQU5 B MA13 NT5CB64M16DP CF EAN61857201 DDR_1333_NANYA_NEW IC1202 2 A0 N3 A1 P7 A2 P3 A3 N2 A4 P8 A5 P2 A6 R8 A7 R2 A8 T8 A9 R3 A10 A...

Page 34: ...SCK 3 5V_ST KRC103S Q1401 OPT E B C 3 5V_ST 0 1uF C1401 4 7K R1404 OPT SPI_CS SPI_SDO MX25L8006EM2I 12G IC1401 S_FLASH_MAIN_MACRONIX 3 WP 2 SO SIO1 4 GND 1 CS 5 SI SIO0 6 SCLK 7 HOLD 8 VCC 33 R1405 10K R1403 OPT SPI_SDI FLASH_WP 0 OPT R1401 W25Q80BVSSIG IC1401 1 S_FLASH_MAIN_WINBOND 3 WP IO2 2 DO IO1 4 GND 1 CS 5 DI IO0 6 CLK 7 HOLD IO3 8 VCC 3 5V_ST SFLASH 20110324 13 GP3_S7LR Copyright 2012 LG E...

Page 35: ... MLB 201209 0120P N2 L3702 5V_TUNER 22pF 50V FULL_NIM C3714 150 R3703 OPT 0 1uF 16V C3738 0 FULL_NIM R3730 1 10W 1 HALF_NIM R3766 22uF 10V C3723 10K OPT R3754 2SC3052 OPT Q3704 E B C TU_SCL 220 R3752 BUFFER 3 3V_TU 22pF 50V FULL_NIM C3712 1 2V 1 8V_TU TUNER_RESET 1 2V 1 8V_TU AP1117EG 13 HALF_NIM_1 2V_DIODES IC3703 1 ADJ GND OUT IN 3 3V_TU 3 3V_TU IF_AGC_SEL MLG1005SR27JT R3735 1 TU_I2C_FILTER 10K...

Page 36: ...T2A_1 26 OUT2A_2 27 PGND2A 28 BST2A 29 VDR2 30 GND_2 31 VCC_5 32 VDR1 33 BST1B 34 PGND1B 35 OUT1B_1 36 OUT1B_2 37 PVDD1_1 38 PVDD1_2 39 PVDD1_3 40 OUT1A_1 41 OUT1A_2 42 PGND1A 43 BST1A 44 RESET 45 AD 46 GND_IO 47 CLK_I 48 VDD_IO 49 E P 4 7K R519 0 1uF 50V C520 2SC3052 Q501 NON_LIPS E B C 0 47uF 50V C535 3 3K R505 10 0uH L505 1N4148W 100V OPT D502 12 R508 1N4148W 100V OPT D503 4 7K R517 10 0uH L504...

Page 37: ... C1617 OPT SC1_B COMP1_Pb AV_R_IN 10K EU_OPT R1668 SC1 COMP1_DET 12K R1634 SC1_R COMP1_Pr 30V D1605 0 1uF EU_OPT C1636 75 R1605 COMP2_Y 5 6V OPT D1608 10K R1612 5 6V D1616 390 EU_OPT R1635 DTV MNT_R_OUT 10K R1613 DTV MNT_R_OUT 390 R4211 EU_OPT 330pF 50V C1662 REAR_AV 12K R1689 REAR_AV 1000pF 50V EU_OPT C1610 30V OPT D1618 SC1_SOG_IN EU_OPT L1606 10uF 16V EU_OPT C1644 DTV MNT_L_OUT 0 EU_OPT R4221 2...

Page 38: ...COMP JK9902 3 M3_DETECT 4 M4 5 M5_GND 1 M1 6 M6 ADMC5M03200L_AMODIODE 5 6V OPT D9902 SIDEAV_R_IN ADMC5M03200L_AMODIODE 5 6V SIDE_CVBS D9903 470K SIDE_CVBS R9906 ADMC5M03200L_AMODIODE 5 6V SIDE_CVBS D9904 BLM18PG121SN1D SIDE_CVBS L9903 100pF 50V SIDE_CVBS C9905 12K SIDE_CVBS R9916 COMP2_Pr 10K SIDE_CVBS R9911 5 6V OPT D9908 3 3V_Normal COMP2_Pb 3 3V_Normal 100pF SIDE_CVBS C9901 ADUC30S03010L_AMODIO...

Page 39: ...901 CI_SLOT_OR_GATE_NXP 3 GND 2 A 4 Y 1 B 5 VCC CI_ADDR 3 CI_TS_VAL PCM_A 14 CI_ADDR 11 PCM_WAIT CI_TS_SYNC 0 1uF C1902 33 AR1909 CI_IOWR 0 1 u F 16V C1908 OPT 47 R1902 REG CI_MDI 7 CI_ADDR 13 GND PCM_OE CI_MDI 3 CI_MDI 4 PCM_A 4 2 2K R1922 TOSHIBA TC74LCX244FT 0ITO742440D IC1902 3 2Y4 2 1A1 4 1A2 1 1OE 6 1A3 5 2Y3 7 2Y2 8 1A4 9 2Y1 10 GND 11 2A1 12 1Y4 13 2A2 14 1Y3 15 2A3 16 1Y2 17 2A4 18 1Y1 19...

Page 40: ...0205 7 5T_GAS GAS2 2 MDS62110209 GAS3 5 8 5T_GAS MDS62110209 GAS5 5 8 5T_GAS MDS62110209 8 5T_GAS GAS6 5 MDS62110205 7 5T_GAS GAS1 2 MDS61887708 12 5T_GAS GAS6 4 MDS62110204 5 5T_GAS GAS6 1 MDS61887708 12 5T_GAS GAS2 4 MDS61887708 12 5T_GAS GAS1 4 MDS62110204 5 5T_GAS GAS2 1 MDS62110205 7 5T_GAS GAS6 2 MDS62110205 7 5T_GAS GAS7 2 MDS62110204 5 5T_GAS GAS5 1 MDS62110204 5 5T_GAS GAS7 1 MDS62110209 ...

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