LG 26LN45 -T Series, Service Manual

Page 1: ...D31T MODEL 26LN45 26LN45 T 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: ...s Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 9 TROUBLE SHOOTING 13 BLOCK DIAGRAM 17 EXPLODED VIEW 18 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: ...o the adjustment 3 Test method 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 Asia Oceania Africa Middle East PAL DVB Market 2 Broadcasting system 1 PAL SECAM B G D K 2 PAL I 3 NTSC M 4 DVB T 3 Receiving system Analog Upper Heterodyne Digital COFDM DVB T DVB T Guard...

Page 7: ... 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 74 250 HDTV 108...

Page 8: ...625I 50Hz 4 720 480 31 470 59 940 27 000 SDTV 480P 5 720 480 31 500 60 000 27 027 SDTV 480P 6 720 576 31 250 50 000 27 000 SDTV 576P 50Hz 7 1280 720 44 960 59 940 74 176 HDTV 720P 8 1280 720 45 000 60 000 74 250 HDTV 720P 9 1280 720 37 500 50 000 74 250 HDTV 720P 50Hz 10 1920 1080 33 720 59 940 74 176 HDTV 1080I 11 1920 1080 33 750 60 000 74 250 HDTV 1080I 12 1920 1080 28 125 50 000 74 250 HDTV 10...

Page 9: ...K message 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 automatically detecting 4 Show the message Copying files from memory 5 Updating is sta...

Page 10: ...name Serial number download 4 2 1 Model name Serial number D L 1 Press Power on key of service remote control 2 Connect RS232 Signal Cable to RS 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 M...

Page 11: ... connected with PC for White Balance or equivalent device Total Assembly line should be check whether the color coordinate x y data refer to below table were meet or not Cool Panel Note x y coordinates are drifted 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 temperatur...

Page 12: ...rsion Adjust check Press the Instart key of ADJ remote control 4 6 1 Model Name SW Version 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 Adjust ADC Comp RGB is OK 5 Check EDID RGB HDMI is OK After check all Press the EXIT key of ADJ remote control to go o...

Page 13: ...nnector OK Replace Adapter N N Check IC802 output Voltage Level 12V Replace IC802 Recheck N Check IC809 Output Voltage Level 3 3V_ST Replace IC809 N Y Check IC810 Output Voltage Level 2 5V Replace IC810 N Y Y Y Y Check IC807 Output Voltage Level 1 5V Replace IC807 N Y Check IC806 Output Voltage Level 1 15V Replace IC806 N Check X201 Clock 24MHz Replace X201 N Replace IC100 Flash Memory Y ...

Page 14: ...ace T con Board or module Check FFC Cable for damage or open conductors Replace Cable N Y Y Y Check LED Driver output LED Driver B d P1101 1 2 3 4 9 10 11 12 Check LED Driver IC1100 Replace LED Driver IC N Y 3 No Video Digital TV Check RF Cable Check Tuner TU2603 Data CLK SYN VAL Replace Tuner TU2603 Recheck Y N 1 Check Tuner TU2603 5 Power 3 3V 2 Check IC803 Output voltage 3 3V Replace IC803 Y N ...

Page 15: ...ck Component Cable Wave form of C220 Wave form of C218 Wave form of C222 Wave form of Comp Y Wave form of Comp Pb Wave form of Comp Pr 5 No Video RGB Check input signal format Is it supported Check Hsync Vsync R4024 R4025 Replace R4024 R4025 Check signal RGB R228 R230 R232 C204 C206 C208 N Check JK400 Replace JK400 or Check Device Y N Y Replace R228 R230 R232 C204 C206 C208 N IC101 has problem Y C...

Page 16: ...connector Check I2C Signal JK500 501 15 16 Re download EDID data Y N Check HDCP Key IC101 Replace Scaler IC101 N 7 No Audio Make sure you can t hear any audio and Device support the audio signal normally Check Speaker and its wire connection P700 and the resistance Check Signal from IC700 L700 L701 L706 L709 Y Replace IC700 N Check R4045 Voltage Level 3 3V Y Replace IC807 3 3V N Y Check Signal fro...

Page 17: ...3 SDRAM 1GB NAND Flash 1GB 74LCX244 Buffer IC501 CI_CLK CI_VIAL Error CI_SYNC CI_DATA 0 7 CI ADDR 0 7 PCM_DATA 0 7 PCM_A 0 7 CI_ADDR 0 14 REG CI_OE CI_IORD CI_IOWR CI WE PCM_A 0 14 FE_DE_SDA SCL SERIAL Flash CVBS Scart RGB TV L R Sound F_RB PF OE PF_CEO SPI_CK SPI_CI SPI_CS SPI_DO DDR2 Data 0 15 DDR2 Address 0 12 DDR2 Data 0 15 DDR2 Address 0 12 System EEPROM EEPROM SCL SDA Panel DMB LED Driver IC...

Page 18: ...al 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 manufacturer I...

Page 19: ... NC_29 17 AL 3 NC_3 6 NC_6 16 CL 15 NC_10 14 NC_9 13 VSS_1 12 VDD_1 11 NC_8 10 NC_7 9 E 8 R 7 RB 4 NC_4 5 NC_5 25 NC_16 24 NC_15 23 NC_14 2 NC_2 22 NC_13 21 NC_12 1 NC_1 20 NC_11 19 WP 18 W R128 47K OPT OLP R154 22 R174 10K OPT PWM1 R148 33 C114 0 1uF RGB_DDC_SCL Q100 MMBT3904 NXP E B C PWM2 3 3V_Normal FE_TS_CLK FE_TS_SYNC 3 3V_ST C103 0 1uF PWM2 R103 0 PF_OE R121 4 7K OPT MULTI_ON 3 3V_ST IC103 ...

Page 20: ...9 GND_75 M8 GND_76 K8 GND_77 M10 GND_78 M11 GND_79 L14 GND_80 M15 GND_81 M16 GND_82 M18 GND_83 M25 GND_84 N10 GND_85 N11 GND_86 N13 GND_87 N14 GND_88 N15 GND_89 N16 GND_90 N17 GND_91 N19 GND_92 K7 GND_93 P8 GND_94 P9 GND_95 M9 GND_96 P11 GND_97 P13 GND_98 P16 GND_99 P17 GND_100 P18 GND_101 P12 GND_102 R8 GND_103 R9 GND_104 R11 GND_105 R12 GND_106 R13 GND_107 R17 GND_108 T8 GND_109 T9 GND_110 N7 GN...

Page 21: ...00 R442 470K OPT R414 100 VA407 20V OPT R445 15K USB_CTL VA420 20V DSUB_DET JP410 3 3V_Normal VA400 20V R417 10K JK401 KJA PH 1 0177 3 M3_DETECT 4 M4 5 M5_GND 1 M1 6 M6 DSUB_R MGJ63348202 M1 1 JackShield for CKD JK400 SPG09 DB 010 1 RED 2 GREEN 3 BLUE 4 GND_1 5 DDC_GND 6 RED_GND 7 GREEN_GND 8 BLUE_GND 9 NC 10 SYNC_GND 11 GND_2 12 DDC_DATA 13 H_SYNC 14 V_SYNC 15 DDC_CLOCK 16 SHILED EPHY_TP VA404 5 ...

Page 22: ...2 1 TMDS_CH1 5 TMDS_CH2 6 NC_1 7 NC_2 8 GND_2 9 NC_3 10 NC_4 VA513 20V OPT R523 10K LN4500 R525 0 LN4500 VA503 20V R538 10K OPT LN4500MHL_OLD R521 2 7K R534 10K LN4500 VA511 20V OPT D0 _HDMI1 CK _HDMI1 D0 _HDMI1 CK _HDMI1 D2 _HDMI1 D2 _HDMI1 D1 _HDMI1 VA502 20V D1 _HDMI1 VA510 20V OPT VA509 20V OPT VA507 20V OPT 3 3V_ST VA508 20V OPT R530 0 MN33D R528 1K MN33D HDMI_ARC Q505 MMBT3904 NXP MN33D E B ...

Page 23: ...F OPT IR_OUT IR D601 20V RXACK R601 10K Q602 MMBT3904 NXP OPT IR_OUT E B C 3 3V_ST R617 3 3K KEY_SDA P600 12507WR 12L 1 2 3 4 5 6 7 8 9 10 11 12 13 R618 22 OPT IR_OUT R623 47K OPT IR_OUT JP604 JP606 Q603 MMBT3904 NXP OPT IR_OUT E B C RXA0 Q601 MMBT3904 NXP E B C RXA0 KEY1 D602 20V OPT JP611 R600 10K RXA3 3 3V_ST R626 4 7K R624 4 7K JP612 12V_PANEL_POWER P601 10031HR 30 1 2 3 4 5 6 7 8 9 10 11 12 1...

Page 24: ...1 AGND_PLL 6 DVDD 5 DGND 7 SDATA 8 WCK 9 BCK 10 SDA 11 SCL 12 FAULT 13 MONITOR_0 14 MONITOR_1 15 MONITOR_2 16 BST2B 17 PGND2B 18 OUT2B 19 PVDD2B 20 PVDD2A 21 OUT2A 22 PGND2A 23 BST2A 24 VDR2 25 AGND 26 VCC5 27 VDR1 28 BST1B 29 PGND1B 30 OUT1B 31 PVDD1B 32 PVDD1A 33 OUT1A 34 PGND1A 35 BST1A 36 RESET 37 AD 38 CLK_I 39 GND_IO 40 VDD_IO 41 EP GND R738 12K AUD_MASTER_CLK 3 3V_AMP C723 22000pF 50V L701 ...

Page 25: ...1uF 50V OPT D802 40V SMAB34 R809 10 C823 0 1uF 50V OPT POWER_ON OFF1 JP800 C810 0 1uF 50V R851 47K 1 R876 0 L807 CPI2520NHL3R3ME 2520 3 3uH C894 0 1uF 50V OPT C867 0 1uF 50V OPT MULTI_ON C857 0 01uF 50V OLP C811 0 47uF 16V OPT R875 22K L802 10uH C841 8200pF 25V 1 5V_DDR R812 4 7K C865 0 01uF 50V C809 0 1uF 50V OPT 3 3V_TUNER R867 4 7K 1 BR FULL_NIM C818 0 1uF 50V C847 330pF 50V 3 3V_Normal R891 47...

Page 26: ...6 C1129 1uF 100V OPT R1131 39K 1 23 6 C1125 0 047uF 25V 23 6 R1128 22K 1 23 6 C1123 4700pF 50V 23 6 JP1103 C1135 68uF 35V 21 6 26 R1135 1 5K 1 23 6 R1111 1K 1 16W 21 6 26 C1113 10uF 25V 21 6 26 C1119 100pF 50V 21 6 26 BLU_CURRENT_CTL R1103 10K 1 16W 21 6 26 C1121 4 7uF 50V 23 6 JP1102 JP1101 C1137 1uF 50V 21 6 26 R1125 24K 1 23 6 24V_BLU R1109 30K 1 16W 21 6 26 C1112 47uF 25V 21 6 26 MULTI_ON JP11...

Page 27: ...VDD_1 B2 VDD_2 D9 VDD_3 G7 VDD_4 K2 VDD_5 K8 VDD_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_6 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 G...

Page 28: ... R3715 0 NON_LN4500 ASIA R3798 1K BR FULL_NIM C3751 5pF 50V OPT R3783 0 BR TU3704 TDSN T701F B OPT SI2178_TW_LNA_2INPUT_H 1 RF_S WCTL 2 RESET 3 SCL 4 SDA 5 B1 3 3V 6 SIF 7 B2 1 8V 8 CVBS 9 IF_AGC 10 DIF P 11 DIF N 12 NC_1 13 NC_2 14 NC_3 15 GND 16 NC_4 17 NC_5 18 NC_6 19 NC_7 20 NC_8 21 NC_9 22 NC_10 23 NC_11 24 NC_12 25 NC_13 26 NC_14 27 NC_15 A1 59 LNA_CTRL_1 57 LNA_CTRL_2 58 A1 B1 SHIELD B1 1 8...

Page 29: ...2828 47pF 50V OPT COMP_ADC_FILTER R2823 75 AV_CVBS_DET L2805 1 0 COMP_NON_ADC_FILTER C2825 47pF 50V OPT COMP_ADC_FILTER R2831 10K COMP_Pb L2812 1 0 COMP_NON_ADC_FILTER AUDIO R2841 10K C2827 47pF 50V OPT COMP_ADC_FILTER C2813 0 1uF 16V COMP_Pr L2806 1 0 COMP_NON_ADC_FILTER D2817 5 6V OPT R2833 12K R2832 10K ZD2806 5 6B ZD2805 5 6B L2807 1 0 COMP_NON_ADC_FILTER R2822 75 COMP_DET R2838 1K L2807 CM201...

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