LG 26LT380H-ZA Service Manual Download Page 54

Page: 54 / 76

LGE Internal Use Only

Contents of LCD TV Standard Repair Process Detail Technical Manual

No.

Error symptom

Content

Page

Remarks

A. Video error_ No video/Normal audio

Check LCD back light with naked eye

LED driver B+ measuring method

Check White Balance value

Power Board voltage measuring method

A. Video error_ No video/Video lag/stop

TUNER input signal strength checking method

LCD-TV Version checking method

A. Video error_Color error

LCD TV connection diagram

Check Link Cable (LVDS) reconnection condition

A8
A9

Adjustment Test pattern - ADJ Key

A10

A. Video error_Vertical/Horizontal bar,
residual image, light spot

LCD TV connection diagram

Check Link Cable (LVDS) reconnection condition

A8
A9

Adjustment Test pattern - ADJ Key

A10

Defected Type caused by T-Con/

Inverter/ Module

Exchange T-Con Board (1)

A-1/5

Exchange T-Con Board (2)

A-2/5

Exchange LED driver Board (PSU)

A-3/5

Exchange Module itself (1)

A-4/5

Exchange Module itself (2)

A-5/5

Continue to the next page

Summary of Contents for 26LT380H-ZA

Page 1: ...D36B MODEL 50LN54 50LN54 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: ...lectronics Inc All rights reserved Only for training and service purposes CONTENTS CONTENTS 2 SAFETY PRECAUTIONS 3 SERVICING PRECAUTIONS 4 SPECIFICATION 6 ADJUSTMENT INSTRUCTION 10 BLOCK DIAGRAM 16 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: ...taly Germany France Spain Sweden Finland Neth erlands Belgium Luxemburg Greece Denmark Czech Austria Hungary Swiss Croatia TurkeyNorway Slovenia Poland Ukraine Portugal Ireland Morocco Latvia Estonia Lithania Rumania Bulgaria Russia SlovakiaBosnia Serbia Albania Kazakhstan Belarus DTV MPEG2 4 DVB T2 8 countries UK Denmark Sweden Finland Norway Ireland Ukraine Kazakhstan DTV MPEG2 4 DVB C 37 countr...

Page 7: ... 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 45Msymbol s DVB S QPSK 2 45Msymbol s viterbi DVB S mode 1 2 2 3 3 4 5 6 7 8 DVB S2 mode 1 2 2 3 3 4 3 5 4 5 5 6 8 9 9 10 4 Scart Jack 1EA PAL SECAM Scart 1 Jack is Full scart and support RF OUT analog 5 Video Input RCA 1EA PAL SECAM NTSC 4 System PAL SECAM NTSC PAL6...

Page 8: ... 74 25 HDTV 1080P 19 1920 1080 33 71 29 97 74 176 HDTV 1080P 5 2 HDMI Input PC DTV No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed Remark PC DVI DDC 1 640 350 31 468 70 09 25 17 EGA X 2 720 400 31 469 70 08 28 32 DOS O 3 640 480 31 469 59 94 25 17 VESA VGA O 4 800 600 37 879 60 31 40 00 VESA SVGA O 5 1024 768 48 363 60 00 65 00 VESA XGA O 6 1152 864 54 348 60 053 80 00 VESA O 7 1360 76...

Page 9: ... 25 HDTV 1080i Side by Side half Top and Bottom 9 1920 1080 28 125 50 74 25 HDTV 1080i Side by Side half Top and Bottom 10 1920 1080 27 24 74 25 HDTV 1080P Side by Side half Top and Bottom 11 1920 1080 33 7 30 89 1 HDTV 1080P Side by Side half Top and Bottom 6 2 RF 3D Input DTV No Resolution H freq kHz V freq Hz Pixel clock MHz Proposed 3D input proposed mode 1 1280 720 37 500 50 74 25 HDTV 720P S...

Page 10: ... 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 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 3 Show the message Copying files...

Page 11: ...n transfer the Mode In Carry the command ADC adjust ADC Adjust A D 1 0 Automatically adjustment The use of a internal pattern 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF FF 00 1E 6D a b 10 c 01 03 80 A0 5A 78 0A EE 91 A3 54 4C 99 26 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30 50 40...

Page 12: ...te far away from the target value x y B 1 x y target 2 x y target 3 x target y target 4 x target y target Every 4 case have to fit y value by adjusting B Gain and then fit x value by adjusting R Gain In this case increasing decreasing of B Gain and R Gain can be adjusted Mode Temp Coordinate spec Target Cool 13 000 K X 0 269 0 002 Y 0 273 0 002 X 0 271 Y 0 276 Medium 9 300 K X 0 285 0 002 Y 0 293 ...

Page 13: ...ll 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 And Mechanical Power Switch must be set ON 4 2 3D function test Patt...

Page 14: ... to below 6 1 Signal Table CMD A0h LENGTH 85 94h 1 16 bytes ADH EEPROM Sub Address high 00 1F ADL EEPROM Sub Address low 00 FF Data Write data CS CMD LENGTH ADH ADL Data_1 Data_n Delay 20ms 6 2 Command Set Description FOS Default write 7mode data write Vtotal V_Frequency Sync_Polarity Htotal Hstart Vstart 0 Phase Data write Model Name and Serial Number write in EEPROM 6 3 Method notice 1 Serial nu...

Page 15: ...click 1 Push the 2 MAC Address write At success Download check the OK 3 Start CI Key Download Push the 4 Check the OK or NG 7 2 LAN Inspection 7 2 1 Equipment Condition Each other connection to LAN Port of IP Hub and Jig 7 2 2 LAN inspection solution LAN Port connection with PCB Network setting at MENU Mode of TV Setting automatic IP Setting state confirmation If automatic setting is finished you ...

Page 16: ...CX244FT Buffer TS_DATA 0 7 PCM_DATA 0 7 FE_TS_DATA 0 7 PCM_A 8 14 SPDIF Component1 USB DP DM SPDIF CVBS Y Pb Pr L R R ear Side F SCART SC1_CVBS_IN SC1_R G B FE_ VOUT TMDS HDMI1 TMDS HDMI2 With MHL LAN EPHY H P H P L R TDSQ G501D B LGIT AIF DIF SIF X tal 24M LNB A8303SESTR T IC2701 LNB OUT FE_TS AIR Cable Seattleite DDR3 Add DDR3 Data DDR3 1Gb IC1201 H5TQ1G63EFR PBC DDR3 1Gb IC1202 H5TQ1G63EFR PBC ...

Page 17: ...attleite SERIAL FLASH IC1300 8M bit MX25L8005M2I EEPROM 256Kbit IC104 R1EX2425BSAS0A NAND FLASH IC102 1Gbit K9F1G08U0D SCB0 PCM_A 0 7 CISlot TC74LCX244FT Buffer TS_DATA 0 7 PCM_DATA 0 7 FE_TS_DATA 0 7 PCM_A 8 14 SPDIF Component1 USB DP DM SPDIF CVBS Y Pb Pr L R R ear Side F SCART SC1_CVBS_IN SC1_R G B FE_ VOUT TMDS HDMI1 TMDS HDMI2 With MHL LAN EPHY H P H P L R DDR3 Add DDR3 Data DDR3 1Gb IC1201 H...

Page 18: ...de NAND FLASH IC102 1Gbit K9F1G08U0D SCB0 PCM_A 0 7 TMDS HDMI2 With MHL CONTROL IR LED TACT SWITCH LED_R KEY1 KEY2 IR F SCART SC1_CVBS_IN SC1_R G B FE_ VOUT CISlot TC74LCX244FT Buffer TS_DATA 0 7 PCM_DATA 0 7 FE_TS_DATA 0 7 PCM_A 8 14 TMDS HDMI1 AIR Cable Audio AMP STA380BWF LVDS FHD HD 50Hz FPC 51P 30P DDR3 Add DDR3 Data SPI I2C SERIAL FLASH IC1300 8M bit MX25L8005M2I DDR3 2Gb IC1201 H5TQ2G63DFR ...

Page 19: ...ny 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 man...

Page 20: ...122 AA15 PCMDATA 5 GPIO121 AE21 PCMDATA 6 GPIO120 AB21 PCMDATA 7 GPIO119 Y15 PCMADR 0 GPIO128 W20 PCMADR 1 GPIO127 V20 PCMADR 2 GPIO125 W22 PCMADR 3 GPIO124 AB18 PCMADR 4 GPIO102 AA20 PCMADR 5 GPIO104 AA21 PCMADR 6 GPIO105 Y19 PCMADR 7 GPIO106 AB17 PCMADR 8 GPIO111 Y16 PCMADR 9 GPIO113 AB19 PCMADR 10 GPIO117 AB20 PCMADR 11 GPIO115 AA16 PCMADR 12 GPIO107 AA19 PCMADR 13 GPIO110 AC21 PCMADR 14 GPIO10...

Page 21: ... NC_8 AC4 NC_9 AD3 IP AC3 IM AE3 SIFP AD4 SIFM AC5 IF_AGC AD2 RF_AGC AE2 I2C_SCKM1 GPIO78 AE6 I2C_SDAM1 GPIO79 AD6 XIN AD1 XOUT AC1 SPDIF_IN GPIO150 D7 SPDIF_OUT GPIO151 D6 USB0_DM E3 USB0_DP E2 USB1_DM AC12 USB1_DP AE12 I2S_IN_BCK GPIO148 C8 I2S_IN_SD GPIO149 D8 I2S_IN_WS GPIO147 D9 I2S_OUT_BCK GPIO154 B10 I2S_OUT_MCK GPIO152 C9 I2S_OUT_SD GPIO155 B9 I2S_OUT_WS GPIO153 C10 AUL0 AB9 AUR0 AA11 AUL1...

Page 22: ...ET_ON_SEMI 1 GND 3 VCC 2 RESET R450 0 5 PD_ 3 5V R447 1 2K 1 PD_ 12V 560pF C467 50V L402 MLB 201209 0120P N2 R414 10K 12V 5V_Normal POWER_ON OFF_1 C418 0 1uF 50V 1 10V_VDDC POWER_DET RL_ON C420 22uF 16V R413 20K IC408 1 APX803D29 PWR_DET_ON_DIODES 1 GND 3 VCC 2 RESET 3 3V_Normal 12V R480 100 PD_ 24V R454 11K 1 R456 4 7K 1 16W 1 24V 3 5V_ST L407 MLB 201209 0120P N2 3 5V_ST 3 3V_Normal USB1_CTL R438...

Page 23: ...uF 16V OPT R601 100 3 5V_ST L600 BLM18PG121SN1D KEY2 R602 10K 1 IR R600 100 C604 100pF 50V 3 5V_ST C603 1000pF 50V R603 10K 1 C602 0 1uF 16V KEY1 3 5V_ST R607 3 3K LED_R BUZZ P600 12507WR 08L 1 2 3 4 5 6 7 8 9 R610 1 8K L601 BLM18PG121SN1D CONTROL_FILTER L602 BLM18PG121SN1D CONTROL_FILTER C608 0 1uF 16V CONTROL_FILTER C609 0 1uF 16V CONTROL_FILTER R611 0 CONTROL_NO_FILTER R612 0 CONTROL_NO_FILTER ...

Page 24: ...NG IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC 12 06 20 USB 7 NC4_S7LRM JK700 3AU04S 305 ZC LG 1 2 3 4 5 D700 RCLAMP0502BA OPT SIDE_USB1_DM SIDE_USB1_DP 5V_USB C700 22uF 10V USB SIDE Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 25: ...D_HDMI1_VARISTOR R809 0 DDC_SCL_4 MHL_OCP_DET C801 0 047uF 25V R804 0 JK803 EAG62611204 14 NC 13 CE_REMOTE 5 D1_GND 20 BODY_SHIELD GND 12 CK 11 CK_GND 2 D2_GND 19 HP_DET 18 5V 10 CK 4 D1 1 D2 17 GND 9 D0 8 D0_GND 3 D2 16 DDC_DATA 7 D0 6 D1 15 DDC_CLK R815 10K Q804 E B C Q806 E B C Q805 E B C R813 10K R816 10K MHL_OCP_EN R802 0 R824 2 7K R825 2 7K R810 0 R831 300K VA801 ESD_HDMI1_VARISTOR VA802 ESD...

Page 26: ... THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC SPDIF 12 06 12 10 NC4_S7LRM 3 3V_Normal SPDIF_OUT JK1001 2F01TC1 CLM97 4F SPDIF JACK FOXCONN 3 VIN 2 VCC 1 GND 4 SHIELD C1002 100pF 50V C1001 0 1uF 16V JK1001 1 JST1223 001 SPDIF JACK SOLTEAM 1 GND 2 VCC 3 VINPUT 4 FIX_POLE SPDIF OPTIC JACK 5 15 Mstar Circuit Application SPDIF Copyright 2013 LG Electronics Inc All rights reserved Only fo...

Page 27: ...DQU4 A7 DQU5 A2 DQU6 B8 DQU7 A3 VREFCA M8 VREFDQ H1 ZQ L8 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 ...

Page 28: ..._FLASH_OS 2012 06 20 13 NC4_S7LRM SPI_SCK 3 5V_ST 3 5V_ST C1300 0 1uF R1301 4 7K OPT SPI_CS SPI_SDO IC1300 MX25L8006EM2I 12G SPI_FLASH_MACRONIX 3 WP 2 SO SIO1 4 GND 1 CS 5 SI SIO0 6 SCLK 7 HOLD 8 VCC R1302 33 R1300 10K OPT SPI_SDI FLASH_WP IC1300 1 W25Q80BVSSIG SPI_FLASH_WINBOND 3 WP IO2 2 DO IO1 4 GND 1 CS 5 DI IO0 6 CLK 7 HOLD IO3 8 VCC 3 5V_ST Serial Flash for SPI boot OS Copyright 2013 LG Elec...

Page 29: ...7 HEAD_PHONE 3 DETECT 4 L 5 GND 1 R 3 3V_Normal R1504 10K HEAD_PHONE C1503 1000pF 50V OPT HP_LOUT R1503 1K HEAD_PHONE HP_DET 3 5V_ST HP_ROUT SIDE_HP_MUTE R1501 1K HEAD_PHONE C1502 1000pF 50V OPT R1502 1K HEAD_PHONE Q1502 MMBT3904 NXP HEAD_PHONE_POP E B C Q1503 MMBT3904 NXP HEAD_PHONE_POP E B C Q1505 MMBT3904 NXP HEAD_PHONE_POP E B C Q1504 MMBT3904 NXP HEAD_PHONE_POP E B C Q1501 MMBT3906 NXP HEAD_P...

Page 30: ... 50V R1904 10K PCM_A 11 C1913 0 1uF 16V PCM_A 14 PCM_IRQA CI_MDI 2 CI_OE CI_MIVAL_ERR CI_MDI 0 REG CI_ADDR 0 14 CI_CD1 CI_MDI 2 PCM_A 1 REG CI_TS_SYNC 5V_Normal PCM_A 4 R1926 33 C1906 10uF 10V PCM_A 12 CI_ADDR 12 CI_MISTRT AR1905 33 CI_MCLKI PCM_A 9 IC1901 74LVC1G32GW 3 GND 2 A 4 Y 1 B 5 VCC CI_TS_CLK C1905 0 1uF GND CI_ADDR 10 AR1909 33 AR1906 33 CI_IORD CI_TS_DATA 4 CI_MDI 5 CI_MDI 3 AR1901 33 R...

Page 31: ...S7LRM EPHY_RN EPHY_TN EPHY_TP JK2100 XRJV 01V 0 D12 080 ETHERNET_XMULTIPLE 1 2 3 4 5 6 7 8 9 9 2 5V_Normal EPHY_RP C2104 0 01uF 50V ETHERNET L2101 BLM18PG121SN1D ETHERNET R2101 49 9 ETHERNET R2102 49 9 ETHERNET C2101 0 1uF ETHERNET R2104 49 9 ETHERNET C2102 0 1uF ETHERNET R2103 49 9 ETHERNET JK2100 1 RJ45VT 01SN002 ETHERNET_XML_EMI 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 ETHERNET H W option ETHERNET C...

Page 32: ...N1D DVB_S 3 3V_TU C2643 22uF 10V C2648 0 1uF 16V R2619 82 T2_C_S2 CHINA C2652 20pF 50V R2620 1K S2_RESET 1 23V_TU IF_AGC_SEL LNA_CTRL_1 BR_RESET_DEMOD LNA_CTRL_2 R2644 0 CHINA TU2603 TDSS G501D TUNER_T C_H NIM 5 3 3V 11 DLIF N 2 RESET 10 DLIF_ P 4 SDA 1 NC 9 IF_AGC 8 ALIF_ P 3 SCL 7 1 8V 6 ALIF_ N 12 SHIELD A1 A1 B1 B1 TU2602 TDSQ G601D TUNER_T2 C S2_F NIM 1 NC_1 2 RESET 3 SCL 4 SDA 5 B1 3 3V 6 SI...

Page 33: ... D2703 30V LNB A_GND R2704 33 LNB D2702 30V MBR230LSFT1G LNB LNB_TX C2706 10uF 25V LNB 12V C2713 0 22uF 25V LNB L2701 BLM18PG121SN1D LNB LNB_OUT C2711 0 22uF LNB L2702 15uH SP 7850_15 LNB DEMOD_SCL DEMOD_SDA C2701 18pF LNB C2714 18pF LNB C2702 33pF LNB R2703 36K 1 16W 1 LNB IC2701 A8303SESTR T LNB 1 VCP 3 NC_1 7 SCL 9 ADD 10 TONECTRL 11 TCAP 12 ISET 13 VREG 14 GND 15 VIN 16 LX 17 GNDLX 18 NC_2 19 ...

Page 34: ...SPK_R Q3401 MMBT3904 NXP E B C AUD_LRCH C3414 330pF 50V R3409 43 AUD_SCK AMP_RESET SPK_R R3411 43 C3407 0 1uF 16V POWER_DET 24V C3421 0 22uF 50V C3401 1000pF 50V C3409 0 1uF 16V AMP_SDA C3418 0 22uF 50V R3405 0 OPT SPK_R C3404 2 2uF 10V C3403 0 1uF 16V AUD_LRCK R3406 0 R3407 0 IC3401 STA380BWF 1 VCC_REG 2 VSS_REG 3 OUT2B 4 GND2 5 VCC2 6 OUT2A 7 OUT1B 8 VCC1 9 GND1 10 OUT1A 11 VDD_REG 12 GND_REG 13...

Page 35: ...HAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC 2012 06 20 MSTAR DEBUG_4PIN 39 NC4_S7LRM RGB_DDC_SCL RGB_DDC_SDA P3900 12505WS 04A00 MSTAR_DEBUG_4P 1 2 3 4 5 JP_GND2 JP_GND3 JP_GND4 JP_GND1 MSTART DEBUG_4PIN Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 36: ... THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC RS232C_4P_OS 2012 06 20 40 NC4_S7LRM PM_RXD 3 5V_ST R4001 100 R4000 100 P4000 12507WS 04L RS232C_DEBUG_4P 1 VCC 2 PM_RXD 3 GND 4 RM_TXD 5 GND PM_TXD RS 232C Copyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 37: ...A0 RXA2 LVDS EU RXA2 RXBCK RXB4 RXA3 RXA1 RXB2 RXB3 RXA3 RXBCK RXACK RXA2 RXA1 RXB1 RXB3 RXA3 RXA2 RXA0 RXA4 Shift RXBCK RXB2 RXA4 51Pin LVDS Connector For FHD 60Hz RXACK RXA3 RXACK RXB3 RXA3 RXA1 RXB0 RXA0 RXACK RXB3 LVDS_SEL RXA4 RXB3 RXA4 RXA2 RXA2 RXA1 RXB2 Pol change RXB4 RXB1 RXA4 RXACK RXB3 RXB0 RXB3 RXBCK RXB4 RXA0 RXA2 RXB0 RXB1 RXA3 RXA2 RXBCK RXB4 RXA0 RXA4 RXA2 RXB3 RXA0 RXB0 RXA4 RXAC...

Page 38: ...OMP1_Pr D2818 5 6V OPT R2867 33K EU R2860 2 2K EU R2823 75 R2863 5 6K EU DTV MNT_L_OUT C2819 330pF EU SC1 COMP1_R_IN 3 3V_Normal 3 3V_Normal AV_CVBS_DET R2866 33K EU R2826 470K R2834 12K R2806 75 DTV MNT_R_OUT C2821 10uF 16V EU R2865 470K OPT D2813 20V ESD_SCART R2824 75 C2822 10uF 16V EU DTV MNT_R_OUT R2841 10K SC1 COMP1_DET R2838 1K C2824 33pF EU SC1_B COMP1_Pb COMP2_Y AV_CVBS_IN 4 7uF C2810 EU ...

Page 39: ......

Page 40: ... Power Board 93 2 118 5V v output Normal voltage Y Replace Inverter or module N Repair Power Board or parts End Always check record S W Version and White Balance value before replacing the Main Board Replace Main Board Re enter White Balance value Precaution Established date Standard Repair Process Revised date 1 14 LCD TV Error symptom A Video error No video Normal audio A4 A1 A2 A6 A3 First of a...

Page 41: ...rnal Use Only Normal voltage Check various voltages of Power Board 3 5V 12V 20V or 24V No Video No audio Check and replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A4 Established date Revised date 2 14 LCD TV Error symptom 2013 01 09 ...

Page 42: ...necting RF Cable at other equipment DVD Player Set Top Box Different maker TV etc SVC Bulletin Replace Main B D Check Tuner soldering Normal Picture Y N Y Close Normal Picture Y Close By using Digital signal level meter By using Diagnostics menu on OSD Menu Set up Support Signal Test Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or br...

Page 43: ...t Check whether other equipments have problem or not By connecting RF Cable at other equipment Set Top Box Different maker TV etc Y Change satellite setting match with installed ANT N Normal Picture Y Close N A6 Standard Repair Process Established date Revised date 4 14 LCD TV Error symptom Check satellite setting Check LNB frequency Check satellite Check Satellite connection DiSEqC motor etc Norm...

Page 44: ...ternal Input COMPONENT RGB HDMI DVI Y External device Cable normal External Input Component error Check external device and cable Y External device Cable normal RGB HDMI DVI error Check external device and cable Replace Main B D Replace Main B D N N A Video error Color error A7 N Y End Replace module Request repair for external device cable Color error Check Test pattern A10 A8 A9 Standard Repair ...

Page 45: ...t error Connect other external device and cable Check normal operation of External Input Component and HDMI by connecting Jig pattern Generator Set top Box etc N Y Replace Main B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI Connect other external device and cable Check normal operation of External Input Co...

Page 46: ...al operation Check Power On High Check Power cord was inserted properly Check Power LED Replace Power B D Measure voltage of each output of Power B D N Y Normal voltage Replace Main B D Y OK Replace Main B D N Y Normal Check ST BY 3 5V Replace Power B D N Y Normal voltage Replace Power B D Y A11 A12 A13 A4 Standard Repair Process Established date Revised date 7 14 LCD TV Error symptom Stand By Red...

Page 47: ...t A14 A13 Established date Revised date 8 14 LCD TV Error symptom Standard Repair Process Status Power off List Explanation Normal POWEROFF_REMOTEKEY Power off by REMOTE CONTROL POWEROFF_OFFTIMER Power off by OFF TIMER POWEROFF_SLEEPTIMER Power off by SLEEP TIMER POWEROFF_INSTOP Power off by INSTOP KEY POWEROFF_AUTOOFF Power off by AUTO OFF POWEROFF_ONTIMER Power off by ON TIMER POWEROFF_RS232C Po...

Page 48: ...er menu Speaker off Off N Y Cancel OFF Check audio B 24V of Power Board Normal voltage Y N Replace Power Board and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A15 A16 Disconnection Established date Revised date 9 14 LCD TV Error symptom Standard Repair Process 2013 01 09 ...

Page 49: ...cked audio Discontinuation Noise only for Analog Wrecked audio Discontinuation Noise only for External Input Connect and check other external device N Y Normal audio Check and fix external device Replace Power B D N Y Normal voltage Check input signal RF External Input signal Signal normal When RF signal is not received Request repair to external cable ANT provider Y Check audio B Voltage 24V Repl...

Page 50: ...stomer cause is interference from light in room Check R C Operating When turn off light in room Check Replace Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A17 Normal Voltage Close N N Check 3 5v on Power B D Replace Power B D or Replace Main B D Power B D don t have problem A4 Check IR Output signal Normal Signal N Y Repair Replace IR B D ...

Page 51: ...formation Check input signal Signal input Y N External Input and Component Recognition error Check and fix external device cable RGB HDMI DVI Optical Recognition error Replace Main B D Replace Main B D Fix in accordance with technical information D Function error External device recognition error Established date Revised date 12 14 LCD TV Error symptom Standard Repair Process 2013 01 09 ...

Page 52: ...de the description If there is a Tak Tak noise from the cabinet refer to the KMS fix information and then proceed as shown in the solution manual For models without any fix information provide the description OR Mechanical noise is a natural phenomenon and apply the 1st level description When the customer does not agree apply the process by stage Describe the basis of the description in Part relat...

Page 53: ...al Use Only Replace module Zoom part with exterior damage Module damage Cabinet damage Replace cabinet Replace remote controller Remote controller damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 14 14 LCD TV Error symptom Standard Repair Process 2013 01 09 ...

Page 54: ...gnal strength checking method A5 7 LCD TV Version checking method A6 9 A Video error_Color error LCD TV connection diagram A7 10 Check Link Cable LVDS reconnection condition A8 A9 11 Adjustment Test pattern ADJ Key A10 12 13 A Video error_Vertical Horizontal bar residual image light spot LCD TV connection diagram A8 14 Check Link Cable LVDS reconnection condition A8 A9 15 Adjustment Test pattern A...

Page 55: ...er is ON A13 24 POWER BOARD voltage measuring method A4 25 26 B Power error_Off when on off while viewing POWER OFF MODE checking method A14 28 C Audio error_No audio Normal video Checking method in menu when there is no audio A15 29 Voltage and speaker checking method when there is no audio A16 30 C Audio error_Wrecked audio discontinuation Voltage and speaker checking method in case of audio err...

Page 56: ...urposes LGE Internal Use Only Standard Repair Process Detail Technical Manual Check Back Light On with naked eye A Video error_No video Normal audio ALL MODELS A1 Established date Revised date Error symptom Content LCD TV Power On disjoint back case check lighting at 2 points 2013 01 09 ...

Page 57: ...etail Technical Manual Inverter B 24V measuring method A Video error_No video Normal audio A2 Established date Revised date Error symptom Content LCD TV Measure DC 93 2 118 5V applying to Module from Power Board Output 93 2 118 5V from Power Board supply to Module Check Pin contacting statement and connection statement ALL MODELS 2013 01 09 ...

Page 58: ...te Balance value A Video error_No video Normal audio ALL MODELS A3 Established date Revised date Error symptom Content LCD TV Entry method 1 Press the ADJ button on the remote controller for adjustment 2 Enter into White Balance of item 7 3 After recording the R G B GAIN Cut value of Color Temp Cool Medium Warm re enter the value after replacing the MAIN BOARD 2013 01 09 ...

Page 59: ...cal Manual Power Board voltage measuring method A Video error_No video Audio A4 Established date Revised date Error symptom Content LCD TV Check the DC 24V 12V 3 5V 18 Pin Power Board Main Board Common 1 Power on 2 DRV ON 3 3 5V 4 PDIM 1 5 3 5V 6 PDIM 2 7 GND 8 GND 9 24V 10 24V 11 GND 12 GND 13 12V 14 12V 15 12V 16 N C 17 GND 18 GND Edge LED 2013 01 09 ...

Page 60: ... key Remote controller signal test Select channel When the signal is strong use the attenuator 10dB 15dB 20dB etc Standard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A5 Established date Revised date Error symptom Content LCD TV 2013 01 09 ...

Page 61: ...ard Repair Process Detail Technical Manual LCD TV Version checking method A Video error_Video error video lag stop 1 Checking method for remote controller for adjustment Press the IN START with the remote controller for adjustment Version ALL MODELS A6 Established date Revised date Error symptom Content LCD TV 2013 01 09 ...

Page 62: ...Only Standard Repair Process Detail Technical Manual LCD TV connection diagram 1 A Video error _Vertical Horizontal bar residual image light spot As the part connecting to the external input check the screen condition by signal A7 Established date Revised date Error symptom Content LCD TV ALL MODELS 2013 01 09 ...

Page 63: ...Internal Use Only 1 Check and replace LVDS Cable 2 Check LVDS connection condition Standard Repair Process Detail Technical Manual Check and replace Link Cable LVDS and contact condition A Video error_Color error ALL MODELS A8 A9 Established date Revised date Error symptom Content LCD TV 2013 01 09 ...

Page 64: ... Detail Technical Manual Adjustment Test pattern ADJ Key A Video error_Color error You can view 6 types of patterns using the ADJ Key Checking item 1 Defective pixel 2 Residual image 3 MODULE error ADD BAR SCAN BAR 4 Video error Classification of MODULE or Main B D A10 Established date Revised date Error symptom Content LCD TV 2013 01 09 ...

Page 65: ...r defect CNT Broken T Con Defect CNT Broken T Con Defect CNT Broken T Con Defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Solder defect CNT Broken Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Appendix Exchange T Con Board 1 ...

Page 66: ...for training and service purposes LGE Internal Use Only Abnormal Power Section Solder defect Short Crack Abnormal Power Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange T Con Board 2 ...

Page 67: ...pyright 2013 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only Appendix Exchange PSU LED driver No Light Dim Light Dim Light Dim Light No picture Sound Ok ...

Page 68: ...ly for training and service purposes LGE Internal Use Only Appendix Exchange the Module 1 Panel Mura Light leakage Press damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage Un repairable Cases In this case please exchange the module ...

Page 69: ...zontal Block Gate TAB IC Defect Gate TAB IC Defect Gate TAB IC Defect Vertical Line Source TAB IC Defect Vertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Horizontal Block Gate TAB IC Defect Appendix Exchange the Module 2 Un repairable Cases In this case please exchange the module ...

Page 70: ... service purposes LGE Internal Use Only Standard Repair Process Detail Technical Manual Check front display LED B Power error _No power A11 Established date Revised date Error symptom Content LCD TV ST BY condition Red Front LED control Menu Option Standby light ON 2013 01 09 ...

Page 71: ...cal Manual Check power input voltage and ST BY 3 5V B Power error _No power A12 Established date Revised date Error symptom Content LCD TV Check the DC 24V 12V 3 5V 18 Pin Power Board Main Board Common 1 Power on 2 DRV ON 3 3 5V 4 PDIM 1 5 3 5V 6 PDIM 2 7 GND 8 GND 9 24V 10 24V 11 GND 12 GND 13 12V 14 12V 15 12V 16 N C 17 GND 18 GND Edge LED 2013 01 09 ...

Page 72: ...chnical Manual Checking method when power is ON B Power error _No power A13 Established date Revised date Error symptom Content LCD TV Check the DC 24V 12V 3 5V 18 Pin Power Board Main Board Common 1 Power on 2 DRV ON 3 3 5V 4 PDIM 1 5 3 5V 6 PDIM 2 7 GND 8 GND 9 24V 10 24V 11 GND 12 GND 13 12V 14 12V 15 12V 16 N C 17 GND 18 GND Edge LED 2013 01 09 ...

Page 73: ...thod 1 Press the IN START button of the remote controller for adjustment 2 Check the entry into adjustment item 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A14 Established date Revised date Error symptom Content LCD TV 2013 01 09 ...

Page 74: ...thod in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A15 Established date Revised date Error symptom Content LCD TV 2013 01 09 Checking method 1 Press the MENU button on the remote controller 2 Select the AUDIO function of the Menu 3 Select Sound Out TV Speaker If you set Sound Out menu as External Speaker LG Sound Sync TV Speaker will not work ...

Page 75: ...r RX1 to the speaker terminal and if you hear the Chik Chik sound when you touch the GND and output terminal the speaker is normal Standard Repair Process Detail Technical Manual Voltage and speaker checking method when there is no audio C Audio error_No audio Normal video ALL MODELS A16 Established date Revised date Error symptom Content LCD TV Check the DC 24V 12V 3 5V 18 Pin Power Board Main Bo...

Page 76: ... Amp when the power is in ON condition it is normal when the Analog Tester needle moves slowly and defective when it does not move at all Standard Repair Process Detail Technical Manual Remote controller operation checking method D Function error_ No response in remote controller key error ALL MODELS A17 Established date Revised date Error symptom Content LCD TV P600 1 GND 2 KEY1 3 KEY2 4 3 5V_ST ...

Search results

Summary of Contents for 26LT380H-ZA

Reviews:

Related manuals for 26LT380H-ZA

Brands by name

Popular brands

LG 26LT380H-ZA, Service Manual

Search results

Summary of Contents for 26LT380H-ZA

Reviews:

Related manuals for 26LT380H-ZA

Brands by name

Popular brands