Internal Use Only North/Latin America Europe/Africa Asia/Oceania http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com LED LCD TV SERVICE MANUAL CHASSIS : LD21B MODEL : 42LM3450/345S/345T MODEL : 42LM3450/345S/345T-ZA CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS CONTENTS . ............................................................................................. 2 SAFETY PRECAUTIONS ......................................................................... 3 SERVICING PRECAUTIONS ................................................................... 4 SPECIFICATION ....................................................................................... 6 ADJUSTMENT INSTRUCTION .............................................................. 11 BLOCK DIAGRAM .
SAFETY PRECAUTIONS IMPORTANT SAFETY NOTICE 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 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.
SERVICING 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 create conflict between the following servicing precautions and any of the safety precautions on page 3 of this publication, always follow the safety precautions. Remember: Safety First. General Servicing Precautions 1.
IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through which the IC leads are inserted and then bent flat against the circuit foil. When holes are the slotted type, the following technique should be used to remove and replace the IC. When working with boards using the familiar round hole, use the standard technique as outlined in paragraphs 5 and 6 above. 3. Solder the connections.
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to the LCD TV used LD21B chassis. 3. Test method 2. Requirement for Test 1) Performance: LGE TV test method followed 2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC Each part is tested as below without special appointment.
No.
5. Video resolutions (2D) 5.1. Component Input (Y, CB/PB, CR/PR) 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 3 720*480 15.73 59.94 13.50 SDTV ,DVD 480I 4 720*576 31.25 50.00 27.00 SDTV 576P 5 720*480 31.50 60.00 27.027 SDTV 480P 6 720*480 31.47 59.94 27.00 SDTV 480P 7 1280*720 37.50 50.00 74.25 HDTV 720P 8 1280*720 45.00 60.00 74.
5.4. HDMI Input(PC/DTV) No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) PC(DVI) 1 Proposed Remark DDC 640*350 31.468 70.09 25.17 EGA X 2 720*400 31.469 3 640*480 31.469 70.08 28.32 DOS O 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*768 47.712 60.015 85.50 VESA (WXGA) O 8 1280*1024 63.981 60.020 108.
6. Video 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 59.94/60 148.35/148.5 HDTV 720P Frame packing 3. 1280*720 75 50 148.5 HDTV 720P Frame packing 4 1920*1080 67.5 60 148.5 HDTV 1080P Side by Side(half), Top and bottom 5 1920*1080 56.3 50 148.
ADJUSTMENT INSTRUCTION 1. Application Range (4) Click "Connect" tab. If "Can't" is displayed, check connection between computer, jig, and set. This specification sheet is applied to all of the LCD TV with LD21B chassis. (2) (3) 2. Designation (1) The adjustment is according to the order which is designated and which must be followed, according to the plan which can be changed only on agreeing. (2) Power adjustment : Free Voltage. (3) Magnetic Field Condition: Nil.
3.1. ADC Process (1) ADC - Enter Service Mode by pushing "ADJ" key, - Enter Internal ADC mode by pushing "►" key at "7. ADC Calibration". EZ ADJUST 3.3. EDID data ADC Calibration 0. Tool Option1 ADC Comp 480i NG 1. Tool Option2 ADC Comp 1080p NG 2. Tool Option3 ADC RGB NG 3. Tool Option4 4.
3.4 Function Check * Connecting picture of the measuring instrument (On Automatic control) Inside PATTERN is used when W/B is controlled. Connect to auto controller or push Adjustment R/C POWER ON → Enter the mode of White-Balance, the pattern will come out. - Check display and sound ■ Check Input and Signal items.
* Manual W/B process using adjust Remote control. ▪ After enter Service Mode by pushing "ADJ" key, ▪ E nter White Balance by pushing " ► " key at "8. White Balance". (Pattern Generator MSHG-600, MSPG-6100[Support HDMI1.4]) * HDMI mode NO. 872 , pattern No.83 (1) Please input 3D test pattern like below. (HDMI mode No. 872 , pattern No.83) White Balance EZ ADJUST 0. Tool Option1 1. Tool Option2 2. Tool Option3 3. Tool Option4 4. Tool Option5 5. Country Group 6. Area Option 7. ADC Calibration 8.
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) 6.2. Comand Set 5.1. HI-POT auto-check preparation 5.2.
7. MAC Address & CI+ key download 7.1 MAC Address 7.2 LAN Inspection 7.2.1. Equipment & Condition ▪ Each other connection to LAN Port of IP Hub and Jig 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 7.2.2.
Copyright © LG Electronics. Inc. All rights reserved.
Copyright © LG Electronics. Inc. All rights reserved.
Copyright © LG Electronics. Inc. All rights reserved.
EXPLODED VIEW IMPORTANT SAFETY NOTICE Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes * Stand Base * Set + Stand + Body A2 300 A9 A10 AG1 200 122 501 530 500 LV1 123 540 120 521 510 900 910 400 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.
IC102 NAND01GW3B2CN6E +3.3V_Normal CL /PF_CE1 OPT R104 10K AL PF_ALE W /PF_WE WP C OS R102 3.3K E NC_11 OS R106 1K B /PF_WP NC_12 OPT Q101 MMBT3904(NXP) NC_13 NC_14 NC_15 33 17 32 18 31 19 30 20 29 21 28 22 27 23 26 24 25 1K 34 16 NC_22 OPT 15 C103 0.
MODEL OPTION OPC&SCANNING_CTRL +1.10V_VDDC 0.1uF 0.1uF OPT OPT OPT C4024 OS:NON_DualStream OS:DualStream NonOS:NON_ErrorOut NonOS:ErrorOut OPT C4019 A8 OPT 0.1uF 120HZ MODEL_OPT_7 0.1uF DVB_S NON_120HZ OPT C4013 NON_DVB_S B8 OPT C4011 T24 MODEL_OPT_6 0.1uF MODEL_OPT_5 OPT 0.1uF OLED C4006 NON_OLED C299 U23 0.1uF 3D MODEL_OPT_4 DVB_T2 C292 NON_3D 1uF AB2 T25 0.1uF MODEL_OPT_2 MODEL_OPT_3 NON_DVB_T2 +1.10V_VDDC VDDC : 2026mA C280 MODEL_OPT_1 VDDC 1.
+3.5V_ST --> 3.375V --> 3.46V +12V/+15V PANEL_POWER FROM LIPS & POWER B/D 0.01uF C436 0.01uF 50V OPT C442 10uF 25V C438 0.1uF 25V S MMBT3906(NXP) Q402 GND OPT C408 0.1uF 16V C406 0.1uF 16V +12V/+15V L402 CIS21J121 5 100 L402-*1 MLB-201209-0120P-N2 R408 FOR 200HZ PWM_DIM2 OPT C407 0.1uF 16V 4 24V 6 GND GND 8 3.5V 9 10 3.5V 3.5V 11 12 3.5V GND 13 14 GND GND 15 16 GND/V-sync 12V 17 18 INV ON 12V 19 20 A.DIM 12V 21 22 P.
IR/LED and control for normal models. +3.5V_ST R2404 10K 1% R2405 10K 1% R2411 100 R2401 100 OPT C2408 18pF 50V KEY1 OPT C2401 D2402 0.1uF 5.6V AMOTECH CO., LTD. L2402 BLM18PG121SN1D R2402 100 KEY2 +3.5V_ST IR_OUT_EU R2429 3.3K +3.5V_ST C2403 0.1uF 16V C2404 1000pF 50V B IR_OUT R2431 47K E C IR_OUT Q2405 MMBT3904(NXP) 4 JP2408 5 OPT R2413 1.5K LED_B/LG_LOGO 12_SUB R2432 1.5K R2430 10K C JP2407 6 IR_OUT IR_OUT_EU IR_OUT_EU Q2406 MMBT3904(NXP) 3 L2403 BLM18PG121SN1D +3.
USB (SIDE) USB1_DIODES USB2_DIODES USB_2 EAN61849601 EAN61849601 L1450-*1 MLB-201209-0120P-N2 IC1450 AP2191DSG L1451-*1 MLB-201209-0120P-N2 120-ohm USB_2_BEAD_MAG 120-ohm NC L1451 CIS21J121 OPT R1458 2K 1/8W 5% OPT R1459 2K 1/8W 5% OUT_2 OUT_1 C1451 22uF 16V FLG 8 1 $0.077 7 2 6 3 5 4 GND +5V_USB L1450 CIS21J121 USB_2_BEAD_SS IN_1 C1452 10uF 10V IN_2 EN IC1451 AP2191DSG OPT R1450 2K 1/8W 5% C1453 0.1uF OPT R1452 2K 1/8W 5% OUT_2 OUT_1 8 1 $0.
HDMI 5V_HDMI_1 5V_HDMI_1 +5V_Normal +5V_Normal 5V_HDMI_2 C A1 A2 A1 R830 B R884 R888 2.7K 2.7K DDC_SDA_1 16 R885 R889 2.7K 2.7K DDC_SDA_1 DDC_SDA_2 DDC_SCL_1 DDC_SCL_2 R887 R891 2.7K 2.7K HDMI_SIDE HPD1 10K E HDMI_SIDE Q802 MMBT3904(NXP) C802 0.1uF 16V HDMI_2 R802 1.8K 3.
RGB-PC / SPDIF PC AUDIO SPDIF OPTIC JACK PC_AUDIO +3.3V_Normal JK1102 5.15 Mstar Circuit Application PEJ027-04 SPDIF_OPTIC JK1103 2F01TC1-CLM97-4F VIN SPDIF_OUT OPT R1104 10K OPT C1109 22uF 16V OPT C1110 10uF 16V SPDIF_OPTIC C1131 0.1uF 16V SPDIF_OPTIC C1121 100pF 50V 2 3 Fiber Optic VCC 1 E_SPRING T_TERMINAL1 7A B_TERMINAL1 4 R_SPRING 5 T_SPRING PC_AUDIO R1107 15K AMOTECH CO., LTD. PC_R_IN NON_CI_CAP_PC_AUDIO OPT PC_AUDIO D1101 C1107 R1102 100pF 470K 5.
RS-232C COMMERCIAL/NonOS MODEL OPTION COMMERCIAL MODEL OPTION COMMERCIAL_RS232C_PHONEJACK 32LS3500_RS232C_PHONEJACK JP1002 IR_OUT R1003 100 M6 6 M6 6 M1 1 M1 1 M3_DETECT 3 M3_DETECT 3 M4 4 M4 4 M5_GND 5 M5_GND 5 JP1000 +3.5V_ST R1002 100 JP1001 JP1004 C1000 0.33uF OPT D1000 ADUC 20S 02 010L 20V COMMERCIAL C1005 0.
LVDS for large inch [51Pin LVDS Connector] (For FHD 60Hz) FOR FHD REVERSE(10bit) [30Pin LVDS Connector] (For HD 60Hz_Normal) Change in S7LR FHD P703 FI-RE51S-HF-J-R1500 MIRROR LVDS_SEL Pol-change RXA4+ RXA0+ RXA0- RXA4- RXA0- RXA0+ HD P705 1 +3.3V_Normal FF10001-30 2 3 OPT R705 3.3K 4 RXA3+ RXA1+ RXA1- RXA3- RXA1- RXA1+ 1 RXACK+ RXA2+ RXA2- 2 RXACK- RXA2- RXA2+ 3 RXA2+ RXACK+ RXACK- 4 5 OPT R710 10K 6 +3.
R1227 L1202 CIC21J501NE 1uF 0.1uF C1220 1uF C1241 1uF C1238 1uF C1219 1uF C1218 C1217 0.1uF 0.1uF C1239 10uF C1206 OPT C1251 OS 1K 1% 0.1uF C1250 OS 1% 1K C1249 OS OS 1000pF R1225 0.1uF C1247 C1248 OS 1K 1% CLose to Saturn7M IC AVDD_DDR0 +1.5V_DDR R1228 R1224 OS 1K 1% CLose to Saturn7M IC CLose to DDR3 AVDD_DDR0 B-MVREFDQ B-MVREFCA OS A-MVREFCA OS 1000pF 1000pF C1204 1% 1K C1203 R1205 0.1uF A-MVREFDQ 1000pF 0.
Serial Flash for SPI boot +3.5V_ST +3.5V_ST S_FLASH_MAIN_MACRONIX OPT R1404 4.7K +3.5V_ST IC1401 MX25L8006EM2I-12G CS# /SPI_CS OPT R1403 10K SO/SIO1 SPI_SDO WP# /FLASH_WP OPT R1401 0 GND C 1 8 2 7 3 6 4 5 OS C1401 0.
Headphone *Option : HEAD_PHONE HEAD_PHONE HP_LOUT +3.5V_ST SIDE_HP_MUTE B B C R1500 3.3K HEAD_PHONE_POP OPT C1502 1000pF 50V C HEAD_PHONE R1501 Q1502 1K MMBT3904(NXP) HEAD_PHONE_POP E E B B Q1504 MMBT3904(NXP) HEAD_PHONE_POP HEAD_PHONE E HEAD_PHONE_POP Q1501 MMBT3906(NXP) R1504 10K R1503 1K C HP_DET Q1500 MMBT3904(NXP) E HEAD_PHONE_POP JK1500 KJA-PH-0-0177 +3.
* Option name of this page : CI_SLOT (because of Hong Kong) CI Region CI SLOT +5V_CI_ON CI_DATA[0-7] CI TS INPUT EAG41860102 P1901 P1902 10067972-050LF 10067972-000LF C1903 0.
ETHERNET * H/W option : ETHERNET +2.5V_Normal ETHERNET L3707 BLM18PG121SN1D JK2100 BS-R430051 XRJV-01V-0-D12-080 ETHERNET_UDE 1 2 3 4 5 6 7 8 1 2 3 4 ETHERNET_XMULTIPLE JK2100-*1 1 2 3 EPHY_TN 4 5 EPHY_RP OPT D2103 5.5V ADLC 5S 02 015 5 6 6 7 OPT D2104 5.5V ADLC 5S 02 015 EPHY_RN OPT D2101 5.5V ADLC 5S 02 015 7 8 9 EPHY_TP OPT D2105 5.5V ADLC 5S 02 015 8 9 9 9 ETHERNET C2104 0.
GP4R_GLOBAL_TUNER_BLOCK OPT IC2601 74LVC1G08GW ERROR & VALID PIN RF_SW_OPT R2603 0 OPT R2627 0 FE_TS_VAL 1 +3.3V_TU 5 OPT C2640 0.1uF 16V RF_SWITCH_CTL RF_SW_OPT C2603 0.1uF 16V +3.3V_TU FE_TS_ERR 2 Close to TUNER 3 TU_T/C TU_T2/C TU2602 TDSS-G101D 1 2 3 4 5 6 7 8 9 10 11 TU_T/C/S2 TU2603 TDSN-G301D NC 1 RESET 2 SCL 3 SDA 4 +3.3V 5 SIF 6 +1.8V 7 CVBS 8 IF_AGC 9 DIF[P] 10 DIF[N] 11 NC_1 1 RESET 2 SCL 3 SDA 4 +B1[3.3V] 5 SIF 6 +B2[1.
DVB-S2 LNB Part Allegro (Option:LNB) LNB D2702 40V SX34 LNB ZD1 40V 3A 2A LNB C2701 0.01uF 50V LNB C2713 1uF 50V LNB C2705 68uF 35V LNB C2707 68uF 35V +12V_LNB LNB L2700 33UH SP-7850_33 2.4A close to Boost pin(#1) DCDC_GND LNB C2712 0.
SCART / COMPONENT&COMPSIT COMPONENT2 COMP2_NON_ADC_FILTER L2807-*1 COMP2_ADC_FILTER_L 0 L2807 CM2012FR10KT COMP2_Y+/AV_CVBS_IN OPT D2814 20V R2822 75 COMP2_ADC_FILTER C2829 47pF 50V COMP2_ADC_FILTER C2830 47pF 50V +3.3V_Normal REAR_AV R2837 10K REAR_AV R2838 1K AV_CVBS_DET OPT D2817 5.6V REAR_AV C2813 0.
AUDIO AMP(STA380BWE) +24V_AMP +24V C3403 0.1uF 16V 13 NC_1 14 NC_2 15 NC_3 16 NC_4 17 NC_5 18 NC_6 19 NC_7 20 NC_8 L3402 10.0uH 21 NC_9 C3402 0.1uF 50V C3400 0.1uF 50V 22 NC_10 +3.3V_AMP 23 NC_11 24 NC_12 L3400 CIS21J121 NC_13 25 12 GND_REG NC_14 26 11 VDD_REG NC_15 27 10 OUT1A VDDDIG1 28 9 GND1 GNDDIG1 29 8 VCC1 IC3400 STA380BW FFX3B 31 +3.3V_AMP EAPD/FFX4A 32 C3404 2.
Contents of LCD TV Standard Repair Process No. Error symptom (High category) Error symptom (Mid category) Page 1 No video/Normal audio 1 2 No video/No audio 2 3 A.
Contents of LCD TV Standard Repair Process Detail Technical Manual No.
Standard Repair Process Error symptom LCD TV A. Video error Established date No video/ Normal audio Revised date 2012. 01 .14 1/14 First of all, Check whether all of cables between board is inserted properly or not. (Main B/D↔ Power B/D, LVDS Cable,Speaker Cable,IR B/D Cable,,,) ☞A1 No video Normal audio Normal audio Y ☞A4 Check Back Light On with naked eye N Move to No video/No audio Y On Check Power Board 12v,3.5v etc.
Standard Repair Process LCD TV Error symptom A. Video error Established date No video/ No audio Revised date 2012 . 01 .14 2/14 ☞A4 No Video/ No audio Check various voltages of Power Board ( 3.5V,12V,20V or 24V…) Normal voltage? N Y Check and replace MAIN B/D End Replace Power Board and repair parts Copyright © 2012 LG Electronics. Inc. All rights reserved.
Standard Repair Process Error symptom LCD TV ☞ A5 Check RF Signal level Normal Signal? Y A. Video error Established date Picture broken/ Freezing Revised date 2012. 01 .14 3/14 . 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%) Check whether other equipments have problem or not.
Standard Repair Process Error symptom LCD TV ☞ A5 Check RF Signal level Normal Signal? N A. Video error Established date Tuning fail, Picture broken/ Freezing Revised date 2012. 01 .14 4/14 Check RF signal cable (DVB satellite signal or not) Check whether other equipments have problem or not. (By connecting RF Cable at other equipment) → Set-Top-Box, Different maker TV etc Check satellite setting. - Check LNB frequency.
Standard Repair Process LCD TV Error symptom ☞A7 Check color by input -External Input -COMPONENT -RGB -HDMI/DVI A. Video error Established date Color error Revised date 2012. 01 .
Standard Repair Process LCD TV Error symptom A. Video error Established date Vertical / Horizontal bar, residual image, light spot, external device color error Revised date 2012. 01 .
Standard Repair Process LCD TV Error symptom B. Power error Established date No power Revised date ☞A11 Check Power LED . Stand-By: Red 2012. 01 .14 7/14 ☞A13 DC Power on by pressing Power Key On Remote control Y Power LED On? N Normal N operation? Check Power On ‘”High” OK? Y Replace Power B/D N Y Check Power cord was inserted properly Replace Main B/D ☞A4 Measure voltage of each output of Power B/D N Normal? Y Close Y ※ Check ST-BY 3.
Standard Repair Process LCD TV Error symptom B. Power error Established date Off when on, off while viewing, power auto on/off Revised date 2012. 01 .
Standard Repair Process LCD TV Error symptom C. Audio error Established date No audio/ Normal video Revised date ☞A15 No audio Screen normal Check user menu > Speaker off 2012. 01 .14 9/14 ☞A16 N Off Check audio B+ 24V of Power Board Normal voltage Y Cancel OFF Check Speaker disconnection Y N Replace Power Board and repair parts N Disconnection Replace MAIN Board End Y Replace Speaker Copyright © 2012 LG Electronics. Inc. All rights reserved.
Standard Repair Process LCD TV Error symptom C. Audio error Established date Wrecked audio/ discontinuation/noise Revised date 2012. 01 .
Standard Repair Process Error symptom LCD TV D. Function error Established date Remote control & Local switch checking Revised date 2012. 01 .14 11/14 1. Remote control(R/C) operating error ☞A17 Check R/C itself Operation Normal Y operating? ☞A17 Check & Repair Cable connection Connector solder N Normal operating? Y Check R/C Operating When turn off light in room Check & Replace Baterry of R/C If R/C operate, Explain the customer cause is interference from light in room.
Standard Repair Process LCD TV Check input signal Error symptom Y Signal input? N Established date External device recognition error Revised date Check technical information - Fix information - S/W Version Check and fix external device/cable Copyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposes D. Function error Technical information? N 2012. 01 .
Standard Repair Process LCD TV Identify nose type Error symptom Circuit noise Mechanical noise E. Noise Established date Circuit noise, mechanical noise Revised date Check location of noise 13/14 Replace PSU (with LED driver) OR Replace LED driver Check location of noise ※ Mechanical noise is a natural phenomenon, and apply the 1st level description. When the customer does not agree, apply the process by stage.
Standard Repair Process LCD TV F. Exterior defect Error symptom Zoom part with exterior damage Exterior defect Module damage Replace module Cabinet damage Replace cabinet Remote controller damage Stand dent Copyright © 2012 LG Electronics. Inc. All rights reserved. Only for training and service purposes Established date Revised date 2012. 01 .