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LG 49UF680T/Y, Service Manual

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LG 49UF680T/Y Service Manual Download Page 49

Standard Repair Process Detail Technical Manual 

TV Version checking method 

A. Video error_Video error, video lag/stop 

 

1. Checking method for remote control for adjustment 

Press the IN-START with the remote 

control for adjustment 

Version  

<ALL MODELS> 

 A4 

Established  

date  

Revised  

date  

Error 

symptom 

Content 

A4 

v 

Copyright © 2015 LG Electronics. Inc. All rights reserved. 

Only for training and service purposes

LGE Internal Use Only

Summary of Contents for 49UF680T/Y

Page 1: ...0T Y 49UF680T Y TA 55UF680T Y 55UF680T Y TA 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: ...tronics 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 18 EXPLODED VIEW 25 TROUBLE SHOOTING GUIDE APPENDIX ...

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: ... 2 Television system 1 PAL BG DK I I 2 SECAM L L DK BG I 3 DVB T T2 C S S2 3 Channel Storage ATV DTV 1500EA 4 Receiving system Analog Upper Heterodyne Digital COFDM DVB T Only DVB T Model Digital COFDM DVB T T2 Only DVB T2 Model Digital QAM DVB T Guard Interval Bitrate_Mbit s 1 4 1 8 1 16 1 32 Modulation Code Rate QPSK 1 2 2 3 3 4 5 6 7 8 16 QAM 1 2 2 3 3 4 5 6 7 8 64 QAM 1 2 2 3 3 4 5 6 7 8 DVB T...

Page 7: ...31 50 60 00 27 03 SDTV 480P 6 720 576p 31 25 50 00 27 00 SDTV 576P 50Hz 7 1280 720 44 96 59 94 74 18 HDTV 720P 8 1280 720 45 00 60 00 74 25 HDTV 720P 9 1280 720 45 00 50 00 74 25 HDTV 720P 50Hz 10 1920 1080 28 13 50 00 74 25 HDTV 1080I 50Hz 11 1920 1080 33 72 59 94 74 18 HDTV 1080I 12 1920 1080 33 75 60 00 74 25 HDTV 1080I 13 1920 1080 56 25 50 00 148 50 HDTV 1080P 14 1920 1080 67 50 60 00 148 50 ...

Page 8: ...080 27 00 24 00 63 36 HDTV 1080P 17 1920 1080 33 71 29 97 79 12 HDTV 1080P 18 1920 1080 33 75 30 00 79 20 HDTV 1080P 19 1920 1080 56 25 50 00 148 50 HDTV 1080P 20 1920 1080 67 43 59 94 148 35 HDTV 1080P 21 1920 1080 67 50 60 00 148 50 HDTV 1080P 22 3840 2160 53 95 23 98 297 00 UDTV 2160P 23 3840 2160 54 00 24 00 297 00 UDTV 2160P 24 3840 2160 56 25 25 00 297 00 UDTV 2160P 25 3840 2160 61 43 29 97 ...

Page 9: ...46 59 94 25 17 VESA VGA 4 800 600 37 87 60 31 40 00 VESA SVGA 5 1024 768 48 36 60 00 65 00 VESA XGA 6 1152 864 54 34 60 05 80 00 VESA 7 1360 768 47 71 60 01 84 75 VESA WXGA 8 1280 1024 63 98 60 02 109 00 SXGA 9 1920 1080 67 50 60 00 158 40 WUXGA Reduced Blanking 10 3840 2160 54 00 24 00 297 00 UDTV 2160P 11 3840 2160 56 25 25 00 297 00 UDTV 2160P 12 3840 2160 67 50 30 00 297 00 UDTV 2160P 13 4096 ...

Page 10: ...s displayed for a period of 20 minutes or longer Especially where W B scale is strong Digital pattern 13ch and or Cross hatch pattern 09ch there can some afterimage in the black level area 3 Automatic Adjustment 3 1 MAC address D L CI key D L Option Widevine key D L ESN D L HDCP20 D L Connect USB port Communication Prot connection Com 1 2 3 4 and 115200 Baudrate Mode check Online Only Check the te...

Page 11: ... D L like below photo 3 Input the Factory model name ex 47LB650V ZA or Serial number like photo 4 Check the model name Instart menu Factory name displayed ex 47LB650V ZA 5 Check the Diagnostics DTV country only Buyer model displayed ex 47LB650V ZA 3 5 CI Key checking method Check the Section 3 1 Check whether the key was downloaded or not at In Start menu Refer to below Check the Download to CI Ke...

Page 12: ...0 40 84 63 00 00 1E 0x07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ⓔ2 0 1 2 3 4 5 6 7 8 9 A B C D E F 0 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 01 19 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 40 84 63 00 00 1E 66 21 50 B0 51 00 1B 30 50 40 70 36 00 40 84 63 00 00 1E 00 00 00...

Page 13: ...brate probe then place it on the center of the Display 3 Connect Cable RS 232C to USB 4 Select Model in V com adj Program and begin V com adj 5 When V com adj is complete OK 6 Remove probe and RS 232C cable to complete adj V com Adj must begin as start command va 00 00 and finish as end command wb 00 ff V com adjust data 43 inch 49 inch 55 inch 65 inch Input HDMI Deep Color On FFh Checksum HDMI De...

Page 14: ...brate probe then place it on the center of the Display 3 Connect Cable RS 232C to USB 4 Select mode in adj Program and begin adj 5 When adj is complete OK Sign check adj status pre mode Warm Medium Cool 6 Remove probe and RS 232C cable to complete adj W B Adj must begin as start command wb 00 00 and finish as end command wb 00 ff and Adj offset if need 2 Manual adjustment method 1 Set TV in Adj mo...

Page 15: ...UO INX Sharp CSOT BOE Cool is 13000 K 4 4 Local Dimming Function Check 1 Turn on TV 2 At the Local Dimming mode module Edge Backlight moving right to left Back light of IOP module moving 3 Confirm the Local Dimming mode 4 Press exit Key 4 5 Magic Motion Remote control test Equipment RF Remote control for test IR KEY Code Remote control for test You must confirm the battery power of RF Remote contr...

Page 16: ...1 Method 1 GND Internal Pressure auto check preparation Check that Power Cord is fully inserted to the SET If loose re insert 2 Perform GND Internal Pressure auto check Unit fully inserted Power cord Antenna cable and A V arrive to the auto check process Connect D terminal to AV JACK TESTER Auto CONTROLLER GWS103 4 ON Perform GND TEST If NG Buzzer will sound to inform the operator If OK changeover...

Page 17: ...rom memory 4 Updating is starting 5 Updating Completed The TV will restart automatically 6 If your TV is turned on check your updated version and Tool option explain the Tool option next stage If downloading version is more new than your TV have TV can lost all channel data In this case you have to channel recover if all channel data is cleared you didn t have a DTV ATV test on production line Aft...

Page 18: ...DVB S DEMOD S2 LNB USB2 2 0 eMMC 8GB Sub Micom RENESAS R5F100GEAFB DDR3 1866 X 32 512MB X 2EA P_TS X_TAL 24MHz T2 C S2 W O AD A B X_TAL 32 768KH z I2S Out I2C 4 60P X2 USB I2C 1 HW Port H P AV COMP SCART IN OUT OCP OCP R E A R CVBS YPbPr CVBS RGB SPDIF OUT ETHERNET I2C 3 HW Port SUB ASSY IR KEY LOGO LIGHT Ready WIFI BT Combo USB_WIFI CVBS SMARTCARD_I F B CAS B CAS JAPAN Chip Config 4b 1010 DDR3 18...

Page 19: ...3 HW GPIO28 SCK0 GPIO83 GPIO29 SDA0 GPIO84 I2C_SCL SDA6 SW DIM2 TX4 GPIO112 DIM3 RX4 GPIO113 1 8KΩ I2C SCL SDA1 HW DDCR_CK SCK3 GPIO54 DDCR_DA SDA3 GPIO53 33Ω I2C SCL SDA5 HW GPIO32 SCK5 GPIO87 GPIO33 SDA5 GPIO88 TU6702 TUNER 1 8KΩ 33Ω MSTAR LM14A IC101 NVRAM 3 3V_NORMAL 1 8KΩ I2C_SCL SDA2 HW GPIO30 SCK4 GPIO31 SDA4 33Ω TU6702 TUNER 3 3V_TU 3 3V_NORMAL 3 3V_LNA_TU 100Ω 3 3V_NORMAL IC7700 SW5094A P...

Page 20: ...TS_DATA 1 18 FE_DEMOD1_TS_DATA 2 19 FE_DEMOD1_TS_DATA 3 20 FE_DEMOD1_TS_DATA 4 21 FE_DEMOD1_TS_DATA 5 22 FE_DEMOD1_TS_DATA 6 23 FE_DEMOD1_TS_DATA 7 24 Demod_Core 3 3V_LNA_TU 1 I2C_SCL2_TU 27 I2C_SDA2_TU 30 3 3V_TUNER RF_SWITCH_CTL 2 I2C_SCL5_TU 4 I2C_SDA5_TU 5 TU_SIF_TU 8 TU_CVBS_TU 9 IF_AGC_TU 3 TU_RESET1_TU 25 FILTER FE_DEMOD1_TS_CLK FE_DEMOD1_TS_SYNC FE_DEMOD1_TS_VAL FE_DEMOD1_TS_DATA 0 7 I2C_S...

Page 21: ... Side SoC Side JK3802 COMP1_Y COMP1_Pb COMP1_Pr COMP1 AV1 DVI_L_IN COMP1 AV1 DVI_R_IN COMP1_Y COMP1_Pb BIN1P RIN1P LINEIN_L0 COMP1_Pr COMP1 AV1 DVI_L_IN LINEIN_R0 COMP1 AV1 DVI_R_IN TU_CVBS_TU TU_SIF IF_P N_TU CVBS0 SIFP VIFP VIFM TU_CVBS TU_SIF IF_P N FE_DEMOD1 2_TS_CLK SYNC VAL FE_DEMOD1 2_TS_CLK SYNC VAL AV1_CVBS_IN AV1_CVBS_IN CVBS1 TS1_CLK VLD SYNC ...

Page 22: ...de SoC Side JK3802 COMP1_Y COMP1_Pb COMP1_Pr COMP1 AV1 DVI_L_IN COMP1 AV1 DVI_R_IN COMP1_Y COMP1_Pb BIN1P RIN1P LINEIN_L0 COMP1_Pr COMP1 AV1 DVI_L_IN LINEIN_R0 COMP1 AV1 DVI_R_IN TU_CVBS_TU TU_SIF IF_P N_TU CVBS0 SIFP VIFP VIFM TU_CVBS TU_SIF IF_P N FE_DEMOD1 2_TS_CLK SYNC VAL FE_DEMOD1 2_TS_CLK SYNC VAL AV1_CVBS_IN AV1_CVBS_IN CVBS1 TS1_CLK VLD SYNC ...

Page 23: ...MI2 ARC HDMI1 4 CEC_REMOTE RENESAS MICOM IC3000 LM14A HDMI_AR C X Tal X3000 32 768kHz HDMI1 HDMI2 0 DDC_SCL_1 DDC_SDA_1 TMDS Link 8bits DDC_SCL_2 DDC_SDA_2 TMDS Link 8bits TMDS Link 8bits TMDS DATA 6bits DATA0 1 2 TMDS CLK 2bits HDMI_CEC_MICOM Q3001 DDCDB_CK GPIO40 DDCDB_DA GPIO41 DDCDA_CK GPIO38 DDCDA_DA GPIO39 ARC0 GPIO6 ...

Page 24: ...poses 7 USB WIFI M REMOTE UART USB3 USB_DP3 USB_DM3 DP_P2 DM_P2 TGPIO0 GPIO157 TGPIO1 GPIO158 OCP IC2302 5V_USB_3 USB_OCD3 USB_CTL3 WIFI_DM WIFI_DP DM_P0 DP_P0 RENESAS MICOM IC3000 GPIO3 TX1 GPIO58 GPIO4 RX1 SOC_TX SOC_RX RS232C_Debug 4P wafer USB2 0 LM14A WIFI Combo M_Module_RESET GPIO_PM 10 SPI CZ2N GPIO20 ...

Page 25: ...y 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 Shock Fire or other Hazards Do not modify the original design without permission of manufacturer IMP...

Page 26: ......

Page 27: ...Trouble shooting guide Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 28: ... viewing power auto on off 7 8 C Audio error No audio Normal video 8 9 Wrecked audio discontinuation noise 9 10 D Function error Remote control Local switch checking 10 MR15 operating checking 11 11 12 Wifi operating checking 12 14 External device recognition error 13 15 E Noise Circuit noise mechanical noise 14 16 F Exterior error Exterior defect 15 First of all Check whether there is SVC Bulleti...

Page 29: ...nd 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 16 Error symptom A Video error No video Normal audio A18 A1 A18 A4 A2 First of all Check whether all of cables between board is inserted properly or not Main B D Power B D LVDS Cable Speaker Cab...

Page 30: ...replace MAIN B D Y Replace Power Board and repair parts N End Standard Repair Process A Video error No video No audio A18 Established date Revised date 2 16 Error symptom 2 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 31: ...mal Picture Y N Y Close Y Close By using Digital signal level meter By using Diagnostics menu on OSD Advanced Channels Channel Tuning Manual Tuning Check the Signal Signal strength Normal over 50 Signal Quality Normal over 50 Normal Picture Y Contact with signal distributor or broadcaster Cable or Air N Normal Picture Y Close N A4 Standard Repair Process Established date Revised date 3 16 Error sy...

Page 32: ...rnal device and cable Y External device Cable normal HDMI error Check external device and cable Replace Main T con B D Replace Main T con B D N N A Video error Color error A6 N Y End Replace module Request repair for external device cable Color error Check Test pattern A8 A7 Standard Repair Process Established date Revised date 4 16 Error symptom 4 Copyright 2015 LG Electronics Inc All rights rese...

Page 33: ...y connecting Jig pattern Generator Set top Box etc N Y Replace Main T con B D Screen normal Check screen condition by input External Input Component HDMI DVI Request repair for external device Component error HDMI DVI Connect other external device and cable Check normal operation of External Input Component RGB and HDMI DVI by connecting Jig pattern Generator Set top Box etc Replace Main T con B D...

Page 34: ...f 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 A17 A18 A18 A18 Standard Repair Process Established date Revised date 6 16 Error symptom 6 Stand By Red or Turn On Operating Turn Off Close Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purpos...

Page 35: ...f 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 Power off by RS232C POWEROFF_RESREC Power off by Reservated Record POWEROFF_RECEND Power off by End of Recording POWEROFF_SWDOWN Power off by S W Download POWER...

Page 36: ...d and repair parts Check Speaker disconnection N Y Replace Speaker Replace MAIN Board End C Audio error No audio Normal video A20 A21 A18 Disconnection Established date Revised date 8 16 Error symptom Standard Repair Process 8 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 37: ... 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 13V Replace Main B D In case of External Input signal error Check and fix external device Replace Main B D N End Est...

Page 38: ...e Baterry of R C Check Repair Cable connection Connector solder Normal operating Check B 3 5V On Main B D A22 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 A18 Check IR Output signal Normal Signal N Y Repair Replace IR B D N A22 Replace Main B D Y A22 Standard Repair Process Established date Revised date 10 16 Error symptom 10 Y...

Page 39: ...evised date 11 16 Error symptom 11 Replace MR13 Turn off on the set and press the wheel Press the back key about 5sec Close If you conduct the loop at 3times change the MR15 Y Check the INSTART menu RF Receiver ver is 00 00 Y Check Repair RF assy connection N Down load the Firmware INSTART MENU 14 RF Remocon Test 3 Firmware download Y RF Receiver ver is 00 00 N Close A23 A4 A4 Copyright 2015 LG El...

Page 40: ...nnection N Check the Wifi wafer 14pin Standard Repair Process Established date Revised date 12 16 Error symptom 12 Change the Wifi assy Normal Voltage Close Y Y N Replace Main B D Wi Fi Mac value is NG N Close A24 A4 A4 A24 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 41: ... external device cable 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 14 16 Error symptom Standard Repair Process 14 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 42: ...in the solution manual For models without any fix information provide the description 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 related to nose in the Owner s Manual E Noise Circuit noise mechanical noise Established date Revised date 15 16 Error symptom Stan...

Page 43: ...eplace remote control Remote control damage Stand dent Replace stand F Exterior defect Exterior defect Established date Revised date 16 16 Error symptom Standard Repair Process 16 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 44: ...t A5 7 A Video error _Vertical Horizontal bar residual image light spot Connection diagram A6 8 A Video error_ Color error Check Link Cable EPI reconnection condition A7 9 Adjustment Test pattern ADJ Key A8 10 Appendix Defected Type caused by T Con Inverter Module Exchange Main Board 1 A 1 5 11 Exchange Main Board 2 A 2 5 12 Exchange Power Board PSU A 3 5 13 Exchange Module 1 A 4 5 14 Exchange Mod...

Page 45: ...ing method A19 19 C Audio error_ No audio Normal video Checking method in menu when there is no audio A20 20 Voltage and speaker checking method when there is no audio A21 21 D Function error Remote control operation checking method A22 22 Motion Remote operation checking method A23 23 Wifi operation checking method A24 Continued from previous page Copyright 2015 LG Electronics Inc All rights rese...

Page 46: ...D back light with naked eye A Video error_No video Normal audio After turning on the power and disassembling the case check with the naked eye whether you can see light from locations A1 ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 47: ...o A2 Entry method 1 Press the ADJ button on the remote control for adjustment 2 Enter into White Balance of item 10 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 ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 48: ...andard Repair Process Detail Technical Manual TUNER input signal strength checking method A Video error_Video error video lag stop ALL MODELS A3 Established date Revised date Error symptom Content A3 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 49: ...g stop 1 Checking method for remote control for adjustment Press the IN START with the remote control for adjustment Version ALL MODELS A4 Established date Revised date Error symptom Content A4 v Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 50: ...ltage from power supply finally replace the MAIN BOARD Standard Repair Process Detail Technical Manual TUNER checking part A Video error_Video error video lag stop ALL MODELS A5 Established date Revised date Error symptom Content A5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 51: ...ntal bar residual image light spot As the part connecting to the external input check the screen condition by signal A6 Established date Revised date Error symptom Content A6 ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 52: ...on A Video error_Color error Check the contact condition of the Link Cable especially dust or mis insertion A7 Established date Revised date Error symptom Content A7 ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 53: ...rns 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 A8 Established date Revised date Error symptom Content A8 ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 54: ...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 Main Board 1 A 1 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 55: ...r Section Solder defect Short Crack Fuse Open Abnormal power section Noise GRADATION GRADATION Abnormal Display Appendix Exchange Main Board 2 A 2 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 56: ...ix Exchange Power Board PSU No Light Dim Light Dim Light Dim Light No picture Sound Ok A 3 5 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 57: ...ss damage Crosstalk Crosstalk Press damage Panel Mura Light leakage Press damage A 4 5 Un repairable Cases In this case please exchange the module Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 58: ...k 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 A 5 5 Un repairable Cases In this case please exchange the module Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 59: ...icator B Power error _No power A17 Established date Revised date Error symptom Content A17 ST BY condition On or Off Power ON condition Turn Off ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 60: ...chnical Manual Revised date A18 Error symptom Content Check power input voltage B Power error _No power A18 Check the DC 13 2V ALL MODELS Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 61: ...em 3 Standard Repair Process Detail Technical Manual POWER OFF MODE checking method B Power error _Off when on off whiling viewing ALL MODELS A19 Established date Revised date Error symptom Content A19 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 62: ...elect TV Speaker Standard Repair Process Detail Technical Manual Checking method in menu when there is no audio C Audio error_No audio Normal video ALL MODELS A20 Established date Revised date Error symptom Content A20 Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only ...

Page 63: ...rminal 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 A21 Established date Revised date Error symptom Content A21 1 SPK_R 2 SPK_R 3 SPK_L 4 SPK_L ALL MODELS Copyright 2015 LG Electronics Inc All rights r...

Page 64: ...efective Standard Repair Process Detail Technical Manual Remote control operation checking method D Function error A22 Established date Revised date Error symptom Content A22 1 GND 2 3 3V_Normal 3 BT_RESET 4 USB_DM 5 NC 6 USB_DP 7 SDA 8 KEY1 9 SCL 10 KEY2 11 IR 12 3 5V_ST 13 LED_R 14 GND Checking order to check remote control IR Jog Assy ALL MODELS Copyright 2015 LG Electronics Inc All rights rese...

Page 65: ...T Wifi cable condition between BT Wifi assy Main board 2 Check the 3 5V on the terminal 16 Checking order to check motion remote wifi Wifi BT Front Wifi BT Rear ALL MODELS 1 GND 2 3 3V_Normal 3 BT_RESET 4 USB_DM 5 NC 6 USB_DP 7 SDA 8 KEY1 9 SCL 10 KEY2 11 IR 12 3 5V_ST 13 LED_R 14 GND Copyright 2015 LG Electronics Inc All rights reserved Only for training and service purposes LGE Internal Use Only...

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