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LG Electronics 348C manual

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Table of contents for the manual

  • Page 1

    Printed in Korea P/NO : MFL67360736 (121 1-REV01) CHASSIS : LD21C MODEL : 32LS3450/345S/345T 32LS341C/348C MODEL : 32LS341C/3450/345S/345T/348C-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. LED LCD TV SER VICE MANUAL North/Latin America http://aic.lgservice.com Europe/Africa http://eic.lgservice.com Asia/Ocean[...]

  • 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 LCD TV used LD21C chassis. 2. Requirement for T est Each part is te[...]

  • 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 1) P AL-BG 2) P AL-DK 3) P AL-I/I’ 4) SECAM L/L ’ 5) DVB-T/T2/C/S 3 Receiving system Analog : Upper Heterodyne Digital : COFDM, QAM ► DVB-T - Guard Interval(Bitrate_Mbi[...]

  • 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 ) 5.2. RGB Input (PC) - LS35/LS34/CS46 series models are not supported. No. Resolution H-freq(kHz) V -freq(Hz) Pixel clock(MHz) Proposed 1 720*576 15.625 5[...]

  • Page 9

    - 9 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 5.3. 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*60[...]

  • 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 LCD TV with LD21C chassis. 2. Designation (1) The adjustment is according to the order which is designated and which must be followed[...]

  • Page 11

    - 1 1 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 3.1. ADC Process (1) ADC - Enter Service Mode by pushing "ADJ" key , - Enter Internal ADC mode by pushing "►" key at "7. ADC Calibration". <Caution> Us i ng " po w er o n" k e y [...]

  • Page 12

    - 12 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 3.4 Function Check - Check display and sound ■ Check Input and Signal items. 1) TV 2) A V (SCART / CVBS) 3) COMPONENT (480i) 4) RGB (PC : 1024 x 768 @ 60hz) (* RGB input : LD21B only support) 5) HDMI 6) PC Audio In (* except [...]

  • Page 13

    - 13 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes * Manual W/B process using adjust Remote control. ▪ After enter Service Mode by pushing "ADJ" key , ▪ Enter White Balance by pushing " ► " key at "8. White Balance". * After you finished all [...]

  • Page 14

    - 14 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes 6.3. Method & notice (1) Serial number D/L is using of scan equipment. ( 2 ) Setting of scan equipment operated by Manufacturing T echnology Group. (3) Serial number D/L must be conformed when it is produced in production l[...]

  • Page 15

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

  • Page 16

    - 16 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes Ethernet RGB PC SPDIF Component1 HDMI1/2(DVI) PC/DVI Audi I IF +/ - TU_CVBS SIF L/R LG2111 A IC101 SERIAL FLASH IC1401 (8M b it) MX25L8005M2I LVDS (FHD/50Hz) Audio AMP STA380BWE USB1 DP/DM SPK L/R X-tal 24M FPC(51P) I2S SPDIF C[...]

  • Page 17

    - 17 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes Ethernet RGB PC SPDIF Component1 HDMI1/2(DVI) TDSN TDSN - - G301D G301D (LGIT) (LGIT) PC/DVI Audi In TU_CVBS SIF L/R LG2111 A IC101 SERIAL FLASH IC1401 (8M b it) MX25L8005M2I LVDS (FHD/50Hz) USB1 DP/DM SPK L/R X-tal 24M FPC(51P[...]

  • Page 18

    - 18 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes Ethernet RGB P SPDIF Component1 HDMI1/2(DVI) TDSQ TDSQ - - G001D G001D (LGIT) (LGIT) PC/DVI Au TU_CVBS SIF L/R SERIAL FLASH IC1401 (8M b it) MX25L8005M2I LVDS (FHD/50Hz) USB1 DP/DM SPK L/R X-tal 24M FPC(51P) I2S SPDIF CVBS, Y/P[...]

  • Page 19

    - 19 - LGE Internal Use Only Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes A2 A21 A10 A9 A4 * Set + Stand * Stand Base + Body 900 910 400 540 521 530 810 200 300 501 500 120 122 123 510 L V1 EXPLODED VIEW Many electrical and mechanical parts in this chassis have special safety-related characteristics.[...]

  • Page 20

    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_LARGE 2012/01/13 4 GP4L_S7LR[...]

  • 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. LVDS_LARGE 2011/11/14 11 GP4L_S7LR2 RXA4+ C701 10uF 16V OP[...]

  • Page 22

    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. DDR_256 2011/06/03 12 GP4L_S7LR2 A-MDMU B-MDQL2 B-MDQU2 B-[...]

  • 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. SFLASH_1MB 2011/06/03 13 GP4L_S7LR2 SPI_SCK +3.5V_ST +3.5V[...]

  • Page 24

    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 11/08/13 19 GP4L_S7LR2 CI_DATA[6] CI_ADDR[11] CI_ADD[...]

  • 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. ETHERNET 2011/06/14 21 GP4L_S7LR2 JK2100 XRJV-01V-0-D12-08[...]

  • Page 26

    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. 2011/08/17 IR/CONTROL_W/O_IR_OUT 23 GP4L_S7LR2 JP2407 SENS[...]

  • Page 27

    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. 2011/12/23 TUNER_EU 26 GP4L_S7LR2 FE_TS_DATA[1] FE[...]

  • Page 28

    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. 2011/11/02 DVB_S 27 GP4L_S7LR2 R2704 4.7K LNB A_GN[...]

  • Page 29

    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. 2011/11/16 AMP_STA380BWE 34 GP4L_S7LR2 SPK_R- +3.3[...]

  • 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. CI_TS_DATA[1] PCM_A[4] PCM_A[4] FE_TS_DATA[2] PCM_A[2] PCM[...]

  • 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. R4032 100 OPT EPHY_RN CK+_HDMI2 R242 68 C262 22pF C212 0.0[...]

  • Page 32

    USB DOWN STREAM 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. USB_OCP_DIODE_1EA 2011/11/[...]

  • Page 33

    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. HDMI_2EA(NON SIDE HDMI) 2011/08/12 53 GP4L_S7LR2 DDC_SCL_1[...]

  • Page 34

    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(ERRC) 2012/01/06 55 GP4L_S7LR2 R2806 75 EU_OP[...]

  • 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. 2011/09/26 RS232C_4PIN 57 GP4L_S7LR2 PM_TXD PM_RXD +3.5V_S[...]

  • 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. 2011/09/05 MSTAR DEBUG_4PIN 58 GP4L_S7LR2 RGB_DDC_SCL RGB_[...]

  • Page 37

    [...]

  • Page 38

    Contents of LCD TV Standard Repair Process No. Error symptom (High category) Error symptom (Mid cate gory) Page Remarks 1 A. Video error No video/Normal audio 1 2 No video/No audio 2 3 Tuning fail, Picture broken/ Freezing 3, 4 4 Color error 5 5 Vertical/Horizontal bar, residual image, light spot, external device color error 6 6 B. Power error No p[...]

  • Page 39

    Contents of LCD TV Standard Repair Process Detail Technical Manual No. Error symptom Content Page Remark s 1 A. Video error_ No video/Normal audio Check LCD back light with naked eye A1 2 LED driver B+ 24V me asuring method A2 3 Check White Balance value A3 4 Power Board voltage measuring method A4 6 A. Video error_ No video/Video lag/stop TUNER in[...]

  • Page 40

    Normal audio Y N Move to No video/No audio No video Normal audio Check Back Light On with naked ey e On Y N Check Power Board 12v,3.5v etc. Normal voltage Y N Replace T-con Board or module Repair Power Board or parts Check Power Board 24v output Normal voltage Y Replace Inverter or module N Repair Power Board or parts End Always check & record [...]

  • Page 41

    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 Establis hed date Revised date 2/14 LCD TV Error symptom 2012 . 01 .14 Copyright © 2012 LG Electronics. Inc. All [...]

  • Page 42

    A. Video error Picture bro k en/ Freezing Y N ☞ A5 N Check R F Signal le vel Normal Signal? Check RF Cable Connection 1. Reconnec tion 2. Install Bo oste r Check S/W Version S/W Upgrade Check w hether other e quipments have probl e m or not. (By connecting RF Cabl e at other equipment) → DVD Play er ,S et-Top-Box, Different maker TV etc` SVC Bu[...]

  • Page 43

    A. Video error Tuning fail, Pictur e broken/ Freezing Y N ☞ A5 Check R F Signal le vel Normal Signal? Check S/W Version S/W Upgrade SVC Bulletin? Normal Picture? Y N Y Close Check RF signal cable (DVB satellite signal or not) Check whether other eq uipments have problem or not. (By connecting RF Cable at other equipment) → Set-Top-Box, Differen[...]

  • Page 44

    Color error? Y N ※ Check and replace Link Cable (LVDS) and contact condition Y N Replace Main B/D Color error? Check error color input mode Check color by input -External 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 e[...]

  • Page 45

    Screen normal? N Y Check external device connection condition Y N Check and replace Link Cable Normal? Y Screen normal? Replace module Check color condi tion by input -External Input -Component - RGB - HDMI/DVI End Vertical/Horizontal bar, r esidual image, light spot Request repair for external device A. Video error Vertica l / Horizontal bar, resi[...]

  • Page 46

    B. Power error No power Power LED On? Y N DC Power on by pressing Power Key On Remote control Y N Normal operation? Check Power On ‘”High” Check Power cord was inserted properly Check Power LED Replace Power B/D Measure voltage of each o u tpu t of Power B/D N Y Normal voltage? Replace Main B/D N Y OK? Replace Main B/D N Y Normal? Check ST-BY[...]

  • Page 47

    B. Power error Off when on, off w hile vi ewing, 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 Main B/D CPU Abnormal (If Power Off mode is not display ed) Check Power B/D vol t ag e Y N Replace Main B/D Normal voltage? Repla[...]

  • Page 48

    No audio Screen normal Check user menu > Speaker off Off N Y Cancel OFF Check audio B+ 24V of Power Board Normal vol t ag e 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 v id eo ☞ A15 ☞ A16 Disconnection Establis hed date Revis e d date 9/14 LCD[...]

  • Page 49

    → abnormal audio/di sconti nuation/n oise is same af ter “Check input signal” compared to No audio C. Audio error Wrecked audi o/ disco ntinu ation /noise Wrecked audio/ Discontinuation/ Noise for all audio Check and replace speaker and connector Wrecked audio/ Discontinuation/ Noise only for D-TV Wrecked audio/ Discontinuation/ Noise only fo[...]

  • Page 50

    D. Function error Remote co ntrol & Local sw itch checking Y N 1. Remote control(R/C) op erating error Check R/C itself Operation Norm al operating? Normal operating? Y Close Replace R/ C If R/C operate, Explain th e customer cause is inter ference from light in room. Check R/C Operat ing When turn off light in room Check & Replace Baterry [...]

  • Page 51

    Check technical informatio n - Fix information - S/W Version N Y Technical information? Check input signal Signal input? Y N External Input and Component Recognition error Check and fix externa l devic e/cable RGB,HDMI/ DVI, Optical Recognition error Replace Main B/D Replace Main B/D Fix in accordance with technical information D. Function error Ex[...]

  • Page 52

    Check location of noise Identify nose type Circuit noise Replace PSU (with LED drive r) Replac e L E D driv er Mechanic al noise Check location of noise OR ※ When the nose is severe, rep lace the module (For mode ls with fix infor mation, upgrade the S/W or provide th e d es cript ion) ※ If there is a “Tak Tak ” noise from the cabinet, refe[...]

  • Page 53

    Replace module Zoom par t with exter ior damage Module damage Cabinet damage Replace cabinet Replace remot e controller Remote controller damage Stand dent Replace stand F. Exterior defect Exterior defect Establis hed date Revis e d date 14/14 LCD TV Error symptom Standard Repair Process 2012. 01 .14 Copyright © 2012 LG Electronics. Inc. All right[...]