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LG Electronics 50LN54**-Z* manual

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Table of contents for the manual

  • Page 1

    Printed in Korea P/NO : MFL67729502 (1302-REV00) CHASSIS : LD31B/LD36B MODEL : 50LN54** 50LN54**-Z* CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. LED TV SER VICE 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

    - 2 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes CONTENTS CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SERVICING PRECAUTIO[...]

  • Page 3

    - 3 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes Many 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 [...]

  • Page 4

    - 4 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes SER VICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service manual and its supplements and addenda, read and follow the SAFETY PRECAUTIONS on page 3 of this publication. NOTE : If unforeseen circumstances [...]

  • Page 5

    - 5 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent at against the cir- cuit foil. When holes are the slotted type, the following technique shoul[...]

  • Page 6

    - 6 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes SPECIFICA TION NOTE : Specifications and others are subject to change without notice for improvement . 1. Application range This specification is applied to the LED TV used LD31B/ LD36B chassis. 2. Requirement for T est Each par[...]

  • Page 7

    - 7 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes No. Item Specication Remarks 2 Broadcasting system Analogue TV 1) P AL-BG 2) P AL-DK 3) P AL-I/I’ 4) SECAM-BG 5) SECAM-DK 6) SECAM L/L ’ Digital TV 1) DVB-T/C/T2 Satellite Digital TV 1) DVB-T/C/S/S2 Analogue TV : (RF) VHF[...]

  • Page 8

    - 8 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 5. V ideo resolutions (2D) 5.1. Component Input (Y , C B /P B , C R /P R ) No. Resolution H-freq(kHz) V -freq(Hz) Pixel clock(MHz) Proposed 1 720*576 15.625 50.00 13.5 SDTV ,DVD 576I 2 720*480 15.73 60.00 13.5135 SDTV ,DVD 480I [...]

  • Page 9

    - 9 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 6. V ideo resolutions (3D) 6.1. HDMI Input No. Resolution H-freq(kHz) V -freq(Hz) Pixel clock(MHz) Proposed 3D input proposed mode 1. 1920*1080 53.95 / 54 23.98 / 24 148.35/148.5 HDTV 1080P Frame packing 2. 1280*720 89.9 / 90 59[...]

  • Page 10

    - 10 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes ADJUSTMENT INSTRUCTION 1. Application Range This specification sheet is applied to all of the LED TV with LD31B/ LD36B chassis. 2. Designation (1) The adjustment is according to the order which is designated and which must be f[...]

  • Page 11

    - 1 1 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes * After downloading, have to adjust T ool Option again. (1) Push "IN-ST AR T" key in service remote control. (2) Select "T ool Option 1" and push "OK" key . (3) Punch in the number . (Each model h[...]

  • Page 12

    - 12 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 4. T otal Assembly line process 4.1. White Balance adjustment ▪ W/B Equipment condition CA210 : LED -> CH14, T est signal: Inner pattern(80IRE) ▪ Above 5 minutes H/run in the inner pattern. (“power on” key of adjust [...]

  • Page 13

    - 13 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes How to adjust 1) In case G gain more than 172 Adjust R Gain and B Gain less than 192 2) if the G gain value be adjusted down to 172 G gain increase to 172 and R gain / B gain increase same as G gain increases. 3) if R Gain / B [...]

  • Page 14

    - 14 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 4.5. Outgoing condition Configuration ■ When pressing IN-STOP key by SVC remocon, Red LED are blinked alternatively . And then automatically turn off. (Must not AC power OFF during blinking) 5. HI-POT T est 5.1. HI-POT auto-c[...]

  • Page 15

    - 15 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 7. MAC Address & CI+ key download 7.1 MAC Address 7.1.1 Equipment & Condition ▪ Play file : Serial.exe ▪ MAC Address edit ▪ Input Start / End MAC address 7.1.2 Download method (1) Communication Prot connection Con[...]

  • Page 16

    - 16 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes LV D S (F HD /50H z) S PK L/R F P C (51P) A UD_MASTER_CLK, A UD_L R CH , A UD_L R CK , AUD_SC K SPI CONT R O L IR & LE D / (T ACT SWITCH) LE D _ R KE Y1 KE Y2 IR I2C SE R IA L FLA S H IC130 0 ( 8 M b it ) MX 25L 8005M2I E E[...]

  • Page 17

    - 17 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes TDSQ- G601 D(B) (LGIT) A TV _Video ( Analog) A TV _SIF ( Analog) LV D S (F HD /50H z) Aud i o AMP S TA 3 8 0 BW F S PK L/R X - t a l 24M F P C (51P) A UD_MASTER_CLK, A UD_L R CH , A UD_L R CK , AUD_SC K SPI CONT R O L IR & [...]

  • Page 18

    - 18 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes S PDIF Co mponent1 TDSS - G501 D(B ) (LGIT) A IF, DIF SI F S7L R - M (L GE 212 1 - MS) IC 101 US B DP/ DM S PK L/R X - t a l 24M A UD_MASTE R _ C L K, A UD_L R CH , A UD_L R CK , AUD_SC K SPDI F C VB S, Y/ Pb/ Pr, L/R R e a r S[...]

  • Page 19

    - 19 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes A2 A9 A10 900 200 400 540 521 530 301 500 910 120 300 510 123 122 Set + Stand Stand Base + Stand Body L V1 EXPLODED VIEW Many electrical and mechanical parts in this chassis have special safety-related characteristics. These pa[...]

  • Page 20

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/07/05 MAIN1_EU_OS 1 NC4_S7LRM PCM_D[0] PCM_A[3] CI_TS[...]

  • Page 21

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/07/05 MAIN2_EU_OS 2 NC4_S7LRM L205 HEAD_PHONE 5.6uH A[...]

  • Page 22

    THERMAL THERMAL THERMAL THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. Power_PD2 2012/09/19 4 NC4_S7LRM R[...]

  • Page 23

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. IR/CONTROL 2012/07/18 6 NC4_S7LRM C607 0.1uF 16V OPT R601 [...]

  • Page 24

    USB DOWN STREAM THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING 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-[...]

  • Page 25

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/07/12 HDMI_R1_S1 8 NC4_S7LRM D2+_HDMI2 DDC_SCL_2 CEC_[...]

  • Page 26

    Fiber Optic Fiber Optic THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. SPDIF 12/06/12 10 NC4_S7LRM +3.3V_[...]

  • Page 27

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. M1_DDR (2DDR) 2012/07/16 12 NC4_S7LRM A-MDMU B-MDQL2 B-MDQ[...]

  • Page 28

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. S_FLASH_OS 2012/06/20 13 NC4_S7LRM SPI_SCK +3.5V_ST +3.5V_[...]

  • Page 29

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/06/20 HEADPHONE 15 NC4_S7LRM R1500 3.3K HEAD_PHONE_PO[...]

  • Page 30

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. PCMCI 2012/06/19 19 NC4_S7LRM FE_TS_DATA[7] CI_ADDR[4] CI_[...]

  • Page 31

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LAN 2012/06/21 21 NC4_S7LRM EPHY_RN EPHY_TN EPHY_TP JK2100[...]

  • Page 32

    THERMAL THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/06/19 TUNER_EU 26 NC4_S7LRM FE_TS_DATA[5] FE_[...]

  • Page 33

    THERMAL THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/06/19 LNB 27 NC4_S7LRM R2701 0 C2709 0.1uF 50[...]

  • Page 34

    THERMAL THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. 2012/08/29 AMP_STA380BWEF 34 NC4_S7LRM SPK_L+ +3.5[...]

  • Page 35

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT 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_D[...]

  • Page 36

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL 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[...]

  • Page 37

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. LVDS_EU 2012/06/22 11 NC4_S7LRM R1100 3.3K OPT RXB0- RXA0+[...]

  • Page 38

    THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION. FILRE AND ELECTRICAL SHOCK HAZARDS, WHEN SERVICING IF IS ESSENTIAL THAT ONLY MANUFATURES SPECFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SYMBOL MARK OF THE SCHEMETIC. REAR_JACK_EU 2012/06/19 28 NC4_S7LRM JK2801 PSC008-01 EU 1[...]

  • Page 39

    [...]

  • Page 40

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Normal audio Y N Move to No video/No audio No video Normal audio Check Back Light On w ith naked eye On Y N Check Pow er Board 24v, 12v,3.5v etc . Normal voltage Y N Replace T-con Board or module Repair Power Board or parts Che[...]

  • Page 41

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Normal voltage? Check v ario us voltages of Pow er Board ( 3.5V,12V,20V or 24V…) No Video/ No audio Check and replace MAIN B/D Y Replace Pow er Board and repair parts N End Standard Repair Process A . Video err or No video/ N[...]

  • Page 42

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only A . Video error Picture broken/ Freezing Y N ☞ A5 N Check RF Signal level Normal Signal? Check RF Cable Connection 1. Reconnection 2. Install Booster Check S/W Version S/W Upgrade Check whether other equipments have problem o[...]

  • Page 43

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only A . Video err or Tuning fail, Picture broken/ Freezing Y N ☞ A5 Check RF Signal level Normal Signal? Check S/W Version S/W Upgrade SVC Bulletin? Normal Picture? Y N Y Close Check RF signal cable (DVB satellite si g nal or not[...]

  • Page 44

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Color error? Y N ※ Check and replace Link Cable (LVDS) and contact condition Y N Replace M ain B/D Color error? Check error color input mode Check color by input -External Input -COMPO NENT -RGB -HDMI/DVI Y External device /C[...]

  • Page 45

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Screen normal? N Y Check ex ternal device connecti on conditio n Y N Check and replace Link Cable Normal? Y Screen normal? Replace module Check color condition by input -External Input -Component -HDMI End V ertical/Horizontal [...]

  • Page 46

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only B. Po w er error No power Power LED On? Y N DC Pow er on by pressing Pow er Key On Remote control Y N Normal operation? Check Power On ‘”High” Check Pow er cord was inserted properly Check Power LED Replace Power B/D Meas[...]

  • Page 47

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only B. Power error Off when on, off while viewing, power auto on/off Error? N Y Check Power Off Mode Fix A/C cord & Outlet and check each 3 phase out Check A/C cord Check for all 3 - phase power out Check outlet Replace M ain B[...]

  • Page 48

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only No audio Screen normal Check user menu > Speaker off Off N Y Cancel OFF Check audio B+ 24V of Power Board Normal voltage Y N Replace Pow er Board and repair parts Check Speaker disconn ection N Y Replace Speaker Replace M AI[...]

  • Page 49

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only → abnormal audio/discontinuation/noise is same after “Check input signal” compa red to No audio C. Au dio error Wrecked audio/ discontinuation/noise W recked audio/ Discontin uation/ Noise for all audio Check and replace [...]

  • Page 50

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only D. Fu nction error Remote control & Local switch checking Y N 1. Remote control(R/C) op erating error Check R/C itself Operation Normal operating? Normal operating? Y Close Replace R/C If R/C operate, Explain the customer c[...]

  • Page 51

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Check technical inform ation - Fix information - S/W Version N Y Technical informatio n? Check input signal Signal input? Y N External Input and Component Recognitio n error Check and fix external dev ice/cable RGB,HDM I/ DVI, [...]

  • Page 52

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Check locati on of noi se Identify nose type Circuit noise Replace PS U(with LED driver) Replace LED driver Mechanical noise Check locati on of noi se OR ※ W hen the no se is severe, replace the module (For models with fix in[...]

  • Page 53

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Replace module Zoom part w ith exterior damage Modu le damage Cabinet damage Replace cabine t Replace remote controller Remote controller damage Stand dent Replace stand F . Exterior defect Exterior defect Established date Revi[...]

  • Page 54

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Contents of LCD TV Standard Repair Process Detail T echnical Manual No. Error s ymp tom Conte nt Page Rema rks 1 A. Vi deo error_ No video/Normal audio Check LCD back light with naked eye A1 2 LED driver B+ measu ring method A2[...]

  • Page 55

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Contents of LCD TV Standard Repair Process Detail T echnical Manual N o. Error sympt om Conte nt Page Remar ks 21 B. Power error_No power Check front display LED A11 22 Check power inpu t Voltage & ST-BY 3.5V A12 23 Checkin[...]

  • Page 56

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Check Back Light On with naked ey e A . Video error_No video /Normal aud io <ALL MODELS> A1 Established date Revised date Error symptom Content LCD TV Power On -> disjoi[...]

  • Page 57

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Inverter B+ 24V measuring method A . Video error_No video /Normal aud io A2 Established date Revised date Error symptom Content LCD TV Measure DC 93.2~1 18.5V ap plying to Module[...]

  • Page 58

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Check White Balance value A . Video error_No video /Normal aud io <ALL MODELS> A3 Established date Revised date Error symptom Content LCD TV Entry me thod 1. Press the ADJ [...]

  • Page 59

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Power Board voltage measuring method A . Video error_No video / A ud io A4 Established date Revised date Error symptom Content LCD TV Check the DC 24V , 12V , 3.5V . 18 Pin (Powe[...]

  • Page 60

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only MENU => Press red key Remote controlle r=>signal test => Select channel W hen the signal is strong, use the attenuator (-10dB , -15dB, -20dB etc.) Standard Repair Process Detail T echnical Manual TUNER input signal str[...]

  • Page 61

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual LCD-TV Version checking method A . Video error_Video error , v ideo lag/stop 1. Checking method for remote controller for adjustment Press the IN-ST ART with the remote controlle[...]

  • Page 62

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual LCD TV connection diagram (1) A . Video error _V e rtical/Horizontal bar , residual image, light spot A s the pa rt connecting to the external input, check the screen condition b[...]

  • Page 63

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only 1. Check and replace LVD S Cable 2. Check LVDS connection condi tion Standard Repair Process Detail T echnical Manual Check and replace Link Cable(LVDS) and contact condition A. V ideo error_Color error <ALL MODELS> A 8/A[...]

  • Page 64

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual A djustment T est pattern - ADJ Key A . Video error_Color error Y ou can view 6 ty pes o f patterns using the ADJ Key Checking item : 1. Defective pix el 2. Residual image 3. MOD[...]

  • Page 65

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Solder de fect, CNT Broken T -Con Defe ct, CNT Broken T -Con Defe ct, CNT Broken T -Con Defe ct, CNT Broken Solder de fect, CNT Broken Solder defe ct, CNT Broken Solder de fect, CNT Broken Solder def ect, CNT Broken Abnormal Po[...]

  • Page 66

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Abnormal Power Section Solder de fect, Short/Crack Abnormal Power Section Solder de fect, Short/Crack Fuse Open, Abnormal power section Noise GRADA TION GRADA TION Abnormal Display A ppendix : Exchang e T -Con Board (2)[...]

  • Page 67

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only A ppendix : Exchange PSU(LED driv er) No Lig ht Dim Lig ht Dim Lig ht Dim Lig ht No picture/Sound Ok[...]

  • Page 68

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only A ppendix : Exchange the Module (1) Panel Mura, Light leakage Press damage Crosstalk Crosstalk Press damage Panel Mura, Light leakage Press damage Un -repairable Case s In this ca se pl ease exchange the module.[...]

  • Page 69

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only V ertical Block Source T AB IC Defect Horizontal Block Gate T A B IC Defect Gate T A B IC Defect Gate T AB IC Defect V ertical Line Source T AB IC Defe ct V e rtical Block Source T AB IC Defect Horizontal Block Gate T A B IC De[...]

  • Page 70

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Check front display LED B. Po w er error _N o pow er A 11 Established date Revised date Error symptom Content LCD TV ST -BY condition: Red Front LED control : Menu  Option [...]

  • Page 71

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Check power input voltage and ST-BY 3.5V B. Power error _No power A 12 Established date Revised date Error symptom Content LCD TV Check the DC 24V , 12V , 3.5V . 18 Pin (Power Bo[...]

  • Page 72

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Checking method when pow er is ON B. Po w er error _N o pow er A 13 Established date Revised date Error symptom Content LCD TV Check the DC 24V , 12V , 3.5V . 18 Pin (Power Board[...]

  • Page 73

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Entry method 1. Press the IN-ST AR T button of the remo te controller for adjustment 2. Check the entry into adjustment item 3 Standard Repair Process Detail T echnical Manual POWER OFF MODE checking method B. Power error _Off [...]

  • Page 74

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Standard Repair Process Detail T echnical Manual Checking method in menu when there is no audio C. A udio e rror_No audio/Normal v ideo <ALL MODELS> A 15 Established date Revised date Error symptom Content LCD TV 2013. 01[...]

  • Page 75

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Checking order when there is no audio ① Check the con tact condition of or 24V connector of Main Board ② Measure the 24V input v olta ge supplied from Power Board (If there is no input voltage, remo ve and check the connect[...]

  • Page 76

    Copyrigh t © 2013 LG Elect ronics. Inc. All rights reserved. Only for training and service purposes LGE Internal Use Only Checking order 1, 2. Check IR cable condition between IR & Main board. 3. Check the st-by 3.5V on the terminal 4. 4. W hen checking the Pre-Am p w hen the power is in ON condition, it is norma l when the Analog T ester need[...]