LG 28LB45 series Service Manual Download Page 2

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LGE Internal Use Only

Only for training and service purposes

CONTENTS

CONTENTS .............................................................................................. 2

SAFETY PRECAUTIONS ........................................................................ 3

SERVICING PRECAUTIONS ................................................................... 4

SPECIFICATION ...................................................................................... 6

ADJUSTMENT INSTRUCTION ............................................................. 10

TROUBLE SHOOTING .......................................................................... 15

BLOCK DIAGRAM ................................................................................. 18

EXPLODED VIEW .................................................................................. 19

SCHEMATIC CIRCUIT DIAGRAM ..............................................................

Summary of Contents for 28LB45 series

Page 1: ...D41A MODEL 28LB45 28LB45 Z CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL LED TV SERVICE MANUAL North Latin America http aic lgservice com Europe Africa http eic lgservice com Asia Oceania http biz lgservice com Internal Use Only ...

Page 2: ... Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 10 TROUBLE SHOOTING 15 BLOCK DIAGRAM 18 EXPLODED VIEW 19 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: ...ctrostatic charge on your body by touching a known earth ground Alter natively obtain and wear a commercially available discharg ing wrist strap device which should be removed to prevent potential 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 e...

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: ...erlands Belgium Luxemburg Greece Denmark Czech Austria Hun gary Swiss Croatia Turkey Norway Slovenia Poland Ukraine Portugal Ireland Morocco Latvia Estonia Lithania Rumania Bulgaria Russia SlovakiaBosnia Serbia Albania Kazakhstan Belarus 4 Country Nordic option EU model only Denmark Finland Norway Sweden DTV MPEG2 4 DVB T2 8 countries UK Denmark Sweden Finland Norway Ireland Ukraine Kaza khstan DT...

Page 7: ...6 QAM 1 2 2 3 3 4 5 6 7 8 64 QAM 1 2 2 3 3 4 5 6 7 8 DVB T2 Guard Interval Bitrate_Mbit s 1 4 1 8 1 16 1 32 1 128 19 128 19 256 Modulation Code Rate QPSK 1 2 2 5 2 3 3 4 5 6 16 QAM 1 2 2 5 2 3 3 4 5 6 64 QAM 1 2 2 5 2 3 3 4 5 6 256 QAM 1 2 2 5 2 3 3 4 5 6 DVB C Symbolrate 4 0Msymbols s to 7 2Msymbols s Modulation 16QAM 64 QAM 128 QAM and 256 QAM DVB S S2 symbolrate DVB S2 8PSK QPSK 2 45 Msymbol s ...

Page 8: ...0 800 49 702 59 810 83 500 9 1366 768 47 717 59 79 85 5 5 2 HDMI DTV No Specification Remark Resolution H freq kHz V freq Hz Pixel clock MHz 1 720 480 31 469 31 5000 59 940 60 000 27 000 27 030 SDTV 480P 2 720 576 31 250 50 000 27 864 SDTV 576P 3 1280 720 37 500 50 000 74 250 HDTV 720P 4 1280 720 44 960 45 000 59 940 60 000 74 170 74 250 HDTV 720P 5 1920 1080 33 720 33 750 59 940 60 000 74 170 74 ...

Page 9: ...tion Resolution H freq kHz V freq Hz 1 720x480 15 73 59 94 2 720x480 15 73 60 3 720x480 31 47 59 94 4 720x480 31 5 60 5 1280x720 44 96 59 94 6 1280x720 45 60 7 1920x1080 33 72 59 94 8 1920x1080 33 75 60 9 1920x1080 26 97 23 976 10 1920x1080 27 24 11 1920x1080 33 71 29 97 12 1920x1080 33 75 30 13 1920x1080 67 432 59 94 14 1920x1080 67 5 60 ...

Page 10: ...g Read 5 Click Auto tab and set as below 6 Click Run 7 After downloading check OK message 3 2 USB DOWNLOAD epk file download 1 Make New folder named LG_DTV and put ISP file epk in the folder 2 Put the USB Stick to the USB socket 3 Automatically detecting update file in USB Stick If your downloaded program version in USB Stick is Low it didn t work But your downloaded version is High USB data is au...

Page 11: ... CI key writing process Device CN 3 6 1 Communication Port Connection Connection PCBA USB Port USB to Serial Adapter UC 232A RS 232C cable PC RS 232C port 3 6 2 CI Key Download 1 Set CI Key path Directory at Start Mac CI Download Programme 2 Set COM 1 2 3 4 115200 Baudrate 3 Click port connection button 4 Start CI Key Download Push the button 5 Check OK or NG 6 After completing download CI key val...

Page 12: ...232 Jack 3 Write Model Name Serial Number by use RS 232 4 Must check the serial number at the Diagnostics of SET UP menu Refer to below 4 2 2 Method notice 1 Model Name Serial Number D L is using of scan equipment 2 Setting of scan equipment operated by Manufacturing Technology Group 3 Serial number D L must be conformed when it is produced in production line because serial number D L is mandatory...

Page 13: ...about 0 007 after 30 mins heat run So checking color coordinate within 5 min at total assembly line consider x y coordinates might be up to 0 007 than x y target of each color temperature Note Manual W B process using adjusts Remote control 1 After enter Service Mode by pushing ADJ key 2 Enter White Balance by pushing key at 9 White Balance When doing Adjustment Please make circumstance as below 4...

Page 14: ...rsion Check 1 Check Model Name 2 Check S W Version Refer to the IC Ver in the BOM 4 6 2 Adjust Check 1 Check Country Group 2 Check Area Option 3 Check Tool Option Refer to the BOM Comments 4 Check EDID RGB HDMI is OK After check all Press the EXIT key of ADJ remote control to go out SVC menu 4 7 Outgoing condition Configuration After all function test press IN STOP key by SVC Remote control And ma...

Page 15: ...ck C400 Voltage Level 19V Check IC401 Output Voltage Level 3 3V Check X100 Clock 24MHz Check IC402 Output Voltage Level 1 15V Check IC403 Output Voltage Level 5V Replace IC102 Flash Memory Check Power connector OK Replace IC401 Recheck Replace X100 Replace IC402 Recheck Replace IC403 Recheck Replace Adapter No No No No No Yes Yes Yes Yes Yes Yes ...

Page 16: ...2V Check Panel input Clock P601 9 10 Replace T Con Board or Module Check WLED_ENABLE High Check LED Driver Output C1024 Check IC1001 Q1002 Replace LED Driver IC or FET Replace Cable Replace IC400 Recheck Check IC100 Repair Main B D Check IC101 Replace Main SOC No No No No No Yes Yes Yes Yes Yes Yes Check RF Cable 1 Check RF IC L2606 Power 3 3V 2 Check IC401 Output voltage 3 3V Check SCL SDA Line T...

Page 17: ...raining and service purposes 4 No Video HDMI Check input signal format Is it supported Check HDMI Cable for Damage or Open Connector Replace Main Scaler IC101 Check JK801 for proper connection or Damage Check I2C Signal JK801 Replace Connector Re Download EDID Data No No Yes Yes Yes Yes ...

Page 18: ...OE PF_CEO SPI_CK SPI_CI SPI_CS SPI_DO DDR3 Data 0 15 DDR3 Address 0 12 System EEPROM EEPROM SCL SDA Panel Digital amp TAS5733 SP L SP R Audio_ Master_CLK DATA 3 12 07Mhz HP L R H P AMP SCL SDA CVBS XTAL 24MHz TMDS 148 5MHz HDMI2 MHL HDMI_TMDS HDMI I2C HDMI_TMDS HDMI I2C NTSC ATSC TDJH H101F Half NIM Tuner country Option HDMI2 MHL DDR3 793Mhz Only PIP MT75 MT55 Use MT45 Not use H P HDMI Option MT75...

Page 19: ...nical 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 manufacturer IMPORTANT SAF...

Page 20: ...PT C424 10uF 16V HD 12V Panel C430 0 1uF 16V C437 10uF 10V OPT C428 0 1uF 16V HD 12V Panel C427 10uF 10V C431 10uF 10V C432 0 1uF 16V C416 0 1uF 50V C420 0 1uF 16V C411 0 1uF 50V C410 0 47uF 16V OPT C440 4 7uF 16V C436 1uF 16V HD 12V Panel C415 0 1uF 16V C405 2 2uF 25V C404 2 2uF 25V HD 12V Panel C403 2 2uF 25V C409 2 2uF 25V PANEL_CTL MULTI_ON POWER_ON OFF1 MULTI_ON LED_AMBER L401 10uH L402 10uH ...

Page 21: ...P602 10031HR 30 FHD 5V Panel 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 RXA0 RXA1 C602 0 1uF 16V FHD 5V Panel RXB3 RXA2 RXA1 JP613 RXA3 RXB3 RXB2 R607 0 26 27 5 LVDS RXA3 RXA3 RXA1 RXB1 RXA3 RXB2 RXA2 P600 10031HR 30 HD 12V Panel 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 RXA2 R615 5 6K FHD 5V Panel R623 22 TOUCH KEY...

Page 22: ... AUDIO_IN R720 15K AUDIO_IN R721 470K AUDIO_IN C706 220pF 50V AUDIO_IN R724 1K AUDIO_IN JP716 VA713 20V AUDIO_IN R722 10K AUDIO_IN JK702 KJA PH 1 0177 AUDIO_IN 3 M3_DETECT 4 M4 5 M5_GND 1 M1 6 M6 PC_R_IN JP718 JP717 VA714 20V AUDIO_IN JP719 JP721 JP720 JP714 MGJ63348202 M700 1 JackShield for CKD MGJ63348201 M700 JackShield for NonCKD DSUB SC1_G 5V_Normal SC1_R DSUB SC1_OUT_CTRL C722 0 1uF 50V DSUB...

Page 23: ..._HDMI1 R802 47K MT45 MT55 D0 _HDMI1 D1 _HDMI2 HDMI_ARC D800 RCLAMP0524PA OPT ESD_HDMI1_SEMTECH DEV 1 8 2 7 3 6 4 5 9 10 R817 300K LB45 VA804 OPT R804 0 OPT HDMI_ARC VA806 20V OPT R812 10K MT45 MT55 D801 RCLAMP0524PA OPT ESD_HDMI1_SEMTECH DEV 1 8 2 7 3 6 4 5 9 10 Q801 MMBT3904 NXP LB45 MT55 E B C D2 _HDMI2 VA805 OPT VA810 OPT 5 6V HDMI_ARC R814 10K OPT D2 _HDMI1 3 3V_ST 5V_Normal 5V_Normal R821 10K...

Page 24: ...CMI_29 P1005 12507WR 06L LGD FHD 1 2 3 4 5 6 7 C1011 1uF 10V OPT WLED_ENABLE JP1006 JP1004 24V_BLU JP1005 JP1007 P1001 SM14B SRSS TB 24V 24V 24V 24V 24V GND GND GND GND GND ERROR_OUT INV_ON NC PWN_DIM GND LGD 21 6 26 Connector 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 WLED_DIM_ADJ R1044 0 1 1 LGD FHD CMI C1013 33uF 100V 55TO 105C 21 6 26 27 5 29 Panel C3430 1uF 50V 21 6 26 27 5 29 Panel C1014 1uF 50V 21...

Page 25: ...6 N1 VDD_7 N9 VDD_8 R1 VDD_9 R9 VDDQ_1 A1 VDDQ_2 A8 VDDQ_3 C1 VDDQ_4 C9 VDDQ_5 D2 VDDQ_6 E9 VDDQ_7 F1 VDDQ_8 H2 VDDQ_9 H9 NC_1 J1 NC_2 J9 NC_3 L1 NC_4 L9 NC_7 T7 VSS_1 A9 VSS_2 B3 VSS_3 E1 VSS_4 G8 VSS_5 J2 VSS_6 J8 VSS_7 M1 VSS_8 M9 VSS_9 P1 VSS_10 P9 VSS_11 T1 VSS_12 T9 VSSQ_1 B1 VSSQ_2 B9 VSSQ_3 D1 VSSQ_4 D8 VSSQ_5 E2 VSSQ_6 E8 VSSQ_7 F9 VSSQ_8 G1 VSSQ_9 G9 NT5CB128M16FP DI IC1201 5 DDR_1600_2G...

Page 26: ...4 EN 1 OUT 5 IN CI_ADDR 11 PCM_CD CI_CD2 AR1910 33 CI_MDI 4 PCM_A 4 PCM_A 0 CI_ADDR 1 CI_ADDR 9 R1914 47 PCM_A 13 AR1905 33 PCM_WE C1907 0 1uF 16V R1916 100K PCM_A 10 PCM_A 11 CI_IOWR CI_MDI 3 FE_TS_VAL_ERR PCM_A 5 PCM_A 1 CI_WE PCM_IORD 5V_CI_ON L1900 BLM18PG121SN1D PCM_REG CI_MDI 6 CI_MDI 2 CI_ADDR 4 R1902 100 CI_ADDR 2 AR1906 33 FE_TS_CLK CI_OE CI_ADDR 12 PCM_A 8 R1921 33 CI_ADDR 14 CI_MIVAL_ER...

Page 27: ...TU C2604 0 1uF 16V C2603 100pF 50V R2600 10 IF_N_MSTAR IF_P_MSTAR R2601 10 IF_AGC_MAIN C2600 0 1uF 16V R2602 33 TU_SCL C2605 20pF 50V R2603 33 TU_SDA C2602 20pF 50V C2601 20pF 50V C2606 20pF 50V R2604 1K R2605 1K 3 3V_TU C2643 22uF 6 3V TU_GND_B TU_GND_B R2607 0 R2606 0 C2607 47uF 6 3V 85C OPT TDJH G101D TU2602 47 SHIELD 6 IF P 7 IF N 8 NC_2 9 NC_3 1 B1 3 3V 2 NC_1 3 IF_AGC 4 SCL 5 SDA A1 A1 B1 B1...

Page 28: ...V ESD_SCART C2822 10uF 16V DTV MNT_R_OUT C2824 33pF 4 7uF C2810 OPT C2811 0 1uF 16V OPT DTV MNT_VOUT C2809 0 1uF 16V OPT 3 3V_Normal C2801 47pF 50V IC2802 MM1756DURE OPT 3 BIAS 2 GND 4 OUT 1 IN 6 VCC 5 PS ZD2806 5 6B ZD2807 5 6B R2823 10K R2809 470K R2827 12K VA2803 5 6V OPT 3 3V_Normal R2800 75 1 R2825 1K R2801 75 1 R2821 75 1 R2820 470K R2824 10K R2826 12K 3 3V_Normal ZD2800 1 OPT ESD_COMP_ZENER...

Page 29: ... 21 SCLK 22 SDIN 23 SDA 24 SCL 25 RESET 26 STEST 27 DVDD 28 DVSS 29 GND 30 AGND 31 VREG 32 GVDD_OUT 33 BST_D 34 PVDD_CD_1 35 PVDD_CD_2 36 OUT_D 37 PGND_CD_1 38 PGND_CD_2 39 OUT_C 40 NC_3 41 NC_4 42 BST_C 43 BST_B 44 NC_5 45 NC_6 46 OUT_B 47 PGND_AB_1 48 PGND_AB_2 49 EP R3461 18 SPK_L SPK_R AUD_MASTER_CLK C3477 0 1uF 50V C3458 0 047uF 25V C3472 330pF 50V C3457 4700pF 50V C3459 2200pF 50V R3460 18 C...

Page 30: ...GPIO_PM 10 GPIO17 Y5 GPIO_PM 15 GPIO22 W11 GPIO_PM 4 GPIO11 D3 GPIO_PM 7 GPIO14 AA3 GPIO_PM 8 GPIO15 W5 PWM_PM GPIO200 D4 PM_UART_TX GPIO_PM 1 GPIO8 L15 PM_UART_RX GPIO_PM 5 GPIO12 Y11 IC101 1 LGE2134 256M 256SCALER GPIO78 Y1 GPIO79 W4 I2C_SCKM3 I2C_DDCR_CK GPIO77 K17 I2C_SDAM3 I2C_DDCR_DA GPIO76 J15 SDAM2 GPIO55 U8 SCKM2 GPIO56 T7 SCKM0 GPIO58 U7 SDAM0 GPIO59 V7 I2S_IN_BCK GPIO159 F6 I2S_IN_SD GP...

Page 31: ...3 GND_53 J14 GND_54 K8 GND_55 K10 GND_56 K11 GND_57 L10 GND_58 M5 GND_59 M7 GND_60 M8 GND_61 M9 GND_62 M10 GND_63 N4 GND_64 N5 GND_65 N6 GND_66 N7 GND_67 N8 GND_68 N9 GND_69 N10 GND_70 P4 GND_71 P5 GND_72 P6 GND_73 P7 GND_74 P9 GND_75 P10 GND_76 P15 GND_77 P16 GND_78 P17 GND_79 P18 GND_80 R10 GND_81 R11 GND_82 R12 GND_83 R13 GND_84 R14 GND_EFUSE K7 AVDD_AU33 R4 AVDD_DDR0_CLK L11 AVDD_DDR1_CLK L13 ...

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