Internal Use Only North/Latin America Europe/Africa Asia/Oceania http://aic.lgservice.com http://eic.lgservice.com http://biz.lgservice.com LED TV SERVICE MANUAL CHASSIS : LD36M MODEL : 32LN52** 32LN52**-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 ..............................................................
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. Removal 1.
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to the LED TV used LD36M chassis. 2. Requirement for Test Each part is tested as below without special appointment. (1) Temperature: 25 °C ± 5 °C(77 °F ± 9 °F), CST: 40 °C ± 5 °C (2) Relative Humidity: 65 % ± 10 % (3) Power Voltage : Standard input voltage (AC 100-240 V~, 50/60 Hz) * Standard Voltage of each products is marked by models.
4. Model General Specification No.
5. External Input Support format 5.1. HDMI Input 1 (PC/DTV) No. PC(DVI) 1 2 3 4 5 6 7 8 9 Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) 640*350 720*400 640*480 800*600 1024*768 1152*864 1360*768 1280*1024 1920*1080 31.468 31.469 31.469 37.879 48.363 54.348 47.712 63.981 67.50 70.09 70.08 59.94 60.31 60.00 60.053 60.015 60.020 60.00 25.17 28.32 25.17 40.00 65.00 80.00 85.50 108.0 148.5 Proposed DDC EGA DOS VESA(VGA) VESA(SVGA) VESA(XGA) VESA VESA (WXGA) VESA (SXGA) HDTV 1080P 1 720*480 31.
5.3. USB Input format Category Photo Music Item JPG, PNG, BMP, TIF, TIFF, GIF 4096X4096 MP3 32kbps ~ 320kbps(Bit rate) 32kHz ~ 48kHz(Sample rate) WMA 128bps ~ 320kbps(Bit rate) 8kHz ~ 48kHz(Sample rate) WAV 1.44kbps(Bit rate) 44.1kHz(Sample rate) Category Video Movie Audio Specification Codec Media Container Profile/Level Support MPEG1/ MPEG2 DAT, MPG, MPEG, DVD, TS, TRP, TP 1920X1080 @ 30I MPEG4 (Divx 3.11, Divx 4.12, Divx 5.x, Divx 6, Divx HD, Xvid 1.00, Xvid 1.01, Xvid 1.02, Xvid 1.
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 LED TV with LD36M 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.
3.3. EDID data * After downloading, have to adjust Tool Option again. (1) Push "IN-START" key in service remote control. (2) Select "Tool Option 1" and push "OK" key. (3) Punch in the number. (Each model has their number) (4) Completed selecting Tool option. (1) HD HDMI EDID data(2D Model) 3.1. ADC Process * I f ADC processes as OTP, There is no need to proceed internal ADC. - Enter Service Mode by pushing "ADJ" key, - Enter Internal ADC mode by pushing "►" key at "7. ADC Calibration".
3.4. Function Check ▪ Normal line(LGD/CMI, March ~ December for Gumi, Global) - Check display and sound ■ Check Input and Signal items. 1) TV 2) AV (SCART / CVBS) 3) HDMI * Display and Sound check is executed by Remote control. Not to push the INSTOP key after completion if the function inspection. 4. Total Assembly line process 4.1.V-com adjustment V-Com ▲ ◄ 160 ▼ ► Press OK to Saver ■ V-com adjust (Variable range : ±5) - 5 digit move → push navigation key up or down.
* Auto-control interface and directions * CASE Cool Mode First adjust the coordinate 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 -E very 4 case have to fit y value by adjusting B Gain and then fit x value by adjusting R-Gain. - I n this case, increasing/decreasing of B Gain and R Gain can be adjusted. (1) Adjust in the place where the influx of light like floodlight around is blocked. (illumination is less than 10 lux).
5. HI-POT Test 6.3. Method & notice 5.1. HI-POT auto-check preparation - Check the POWER cable and SIGNAL cable insertion condition 5.2. HI-POT auto-check (1) Pallet moves in the station. (POWER CORD / AV CORD is tightly inserted) (2) Connect the AV JACK Tester. (3) Controller (GWS103-4) on. (4) HI-POT test (Auto) - If Test is failed, Buzzer operates. - If Test is passed, GOOD Lamp on and move to next process automatically. 5.3. Checkpoint (1) Serial number D/L is using of scan equipment.
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 Connection : PCBA (USB Port) → USB to Serial Adapter (UC-232A) → RS-232C cable → PC(RS-232C port) * Caution : LJ21* chassis support only UC-232A driver. (only use this one.
SCREW ASSEMBLY WORKING GUIDE ■ Screw specification and application situation A A A • FAB31339403 (M3*L6, BK, Machine) A A • 4EA B B A B A A B A • FAB31639801 (M4*L10, BK, Taptite) • 9EA C C • FAB30016124 (M4*L14, BK, Machine) • 2EA Check Screw Type When Screw is assembled at 'A' Part. If 'B' Screw is used at the 'A' part, Module will get damaged. Copyright © LG Electronics. Inc. All rights reserved.
DISASSEMBLY WORKING GUIDE 1 2 Disassemble 2 screws that bind Stand Ass’y and set Disassemble 7 screws around the 4 edges of set after Separation Stand Ass’y 3 4 After opening cover of IR Ass’y Disconnect IR cable Disassemble 4 screws that fix Side AV bracket and Back-cover. 6 5 After lifting up back-cover slightly, Disconnect SPK cable Copyright © LG Electronics. Inc. All rights reserved.
DVB-T/C TDSS-G501D Copyright © LG Electronics. Inc. All rights reserved.
24V_Adapter Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes IC400 DCDC,IC IC404 DCDC,IC Q405 3.5V 12V 24V - 19 1.1V 1.5V IC407 LDO 3.3V 12V 5V IC403 DCDC,IC Q403 Q409 IC401 DCDC,IC 2.5V 1.8V IC402 LDO IC2603 LDO NVRAM, MAIN IC DDR MIAN IC Core TU MAIN IC TU, EEPROM NAND, MAIN IC Scart AMP PANEL USB, CI, Normal Audio AMP 24V LED Driver 2.
Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes T-CON NVRAM NVRAM IC104 - 20 - I2C_SDA/SCL 22Ω 0Ω 0Ω V-COM_SDA/SCL 1KΩ +3.3V_NORMAL 22Ω 2.2KΩ +3.3V_NORMAL SPI1_CK SPI1_DI I2C_SCKM2 I2C_SCAM2 I2S_IN_BCK I2S_IN_SD I2C_SCKM1 I2C_SDAM1 S7LRM MSD804KKX 33Ω 1KΩ 20pF AMP_SDA/SCL +3.3V_NORMAL TU_SDA/SCL 20pF 1KΩ +3.3V_TU Audio AMP IC3400 TU_A DEMOD 3.
EXPLODED VIEW IMPORTANT SAFETY NOTICE 120 Copyright © LG Electronics. Inc. All rights reserved. Only for training and service purposes A10 Set + Stand Stand Base + Stand Body A2 200 A31 A9 521 LV1 540 590 400 591 900 910 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.
IR/LED and Control +3.5V_ST R602 10K 1% R603 10K 1% CONTROL_NO_FILTER R611 0 CONTROL_FILTER L601 BLM18PG121SN1D R600 100 KEY1 CONTROL_FILTER C608 0.1uF 16V CONTROL_FILTER L602 BLM18PG121SN1D R601 100 P600 12507WR-08L KEY2 CONTROL_NO_FILTER R612 0 CONTROL_FILTER C609 0.1uF 16V 1 2 +3.5V_ST 3 L600 BLM18PG121SN1D 4 +3.5V_ST C602 0.1uF 16V C603 1000pF 50V R610 1.8K 5 LED_R/BUZZ OPT C607 0.1uF 16V R607 3.
USB (SIDE) +5V_USB OPT ZD700 5V C700 22uF 10V 3 1 2 SIDE_USB1_DM SIDE_USB1_DP 5 4 USB DOWN STREAM 3AU04S-305-ZC-(LG) JK700 D700 RCLAMP0502BA OPT 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. Copyright © 2013 LG Electronics. Inc. All rights reserved.
Serial Flash for SPI boot(OS) +3.5V_ST +3.5V_ST SPI_FLASH_MACRONIX OPT R1301 4.7K +3.5V_ST IC1300 MX25L8006EM2I-12G CS# /SPI_CS OPT R1300 10K SO/SIO1 SPI_SDO WP# /FLASH_WP GND 1 8 2 7 3 6 4 5 C1300 0.1uF VCC HOLD# SCLK SPI_SCK SI/SIO0 R1302 33 SPI_SDI SPI_FLASH_WINBOND IC1300-*1 W25Q80BVSSIG CS DO[IO1] %WP[IO2] GND THE SYMBOL MARK OF THIS SCHEMETIC DIAGRAM INCORPORATES SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM X-RADIATION.
CI Region * Option name of this page : CI_SLOT (because of Hong Kong) CI SLOT CI TS INPUT CI_DATA[0-7] CI_DATA[0-7] +5V_Normal C1906 10uF 10V R1903 10K CI_SLOT_JACK P1901 10067972-000LF FE_TS_DATA[7] FE_TS_DATA[6] FE_TS_DATA[5] CI_MDI[5] FE_TS_DATA[4] CI_MDI[4] AR1906 35 1 36 2 37 3 CI_TS_DATA[4] 38 4 CI_TS_DATA[5] 39 5 CI_TS_DATA[6] CI_TS_DATA[7] 40 6 41 7 42 8 AR1901 33 R1905 43 9 44 10 CI_IOWR 45 11 46 12 CI_MDI[0] 47 13 CI_MDI[1] 48 14 CI_MDI[2] 49 15 CI_
AUDIO AMP(STA380BWEF) NC_2 NC_3 NC_4 NC_5 NC_6 NC_7 NC_1 R3408 43 12 GND_REG C3418 0.22uF 50V C3424 1000pF 50V C3421 0.22uF 50V C3425 1000pF 50V C3422 0.22uF 50V C3426 1000pF 50V C3423 0.22uF 50V C3427 1000pF 50V SPK_L+ SPEAKER_L SPK_L- 48 VDDDIG2 C3414 330pF 50V R3410 43 [EP] 47 C3408 0.1uF 16V R3411 43 COIL_ABCO L3405 10uH C3419 0.22uF 50V SPK_R+ SPEAKER_R SPK_R- +24V +3.3V_Normal L3401 UBW2012-121F AUD_LRCK R3402 10K AUD_LRCH C3407 0.
MSTART DEBUG_4PIN JP_GND4 JP_GND3 JP_GND1 P3900 12505WS-04A00 JP_GND2 MSTAR_DEBUG_4P 1 2 3 RGB_DDC_SCL 4 RGB_DDC_SDA 5 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. Copyright © 2013 LG Electronics. Inc. All rights reserved.
RS-232C RS232C_DEBUG_4P +3.5V_ST P4000 12507WS-04L R4001 100 VCC R4000 100 PM_RXD PM_TXD PM_RXD GND RM_TXD 1 2 3 4 5 GND 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. Copyright © 2013 LG Electronics. Inc. All rights reserved.
EU NOT USED TP (ERRC) BR_RESET_DEMOD RF_SWITCH_CTL HP_ROUT HP_LOUT SIDE_HP_MUTE HP_DET EPHY_TN EPHY_RN EPHY_TP EPHY_RP LNA_CTRL_1 LNA_CTRL_2 LNA2_CTL IF_AGC_SEL DEMOD_SDA DEMOD_SCL S2_RESET 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.
+1.5V_DDR +1.5V_DDR 1uF 1uF C1241 1uF C1238 1uF C1219 1uF C1218 C1217 0.1uF 0.1uF C1239 C1206 C1251 A-MVREFCA 10uF10V 1000pF 0.1uF C1204 1% R1204 R1205 1K C1203 C1202 1K 1% A-MVREFDQ 1000pF 0.1uF 1K 1% 1% 1K C1201 R1202 R1201 +1.5V_DDR CLose to Saturn7M IC CLose to DDR3 DDR_1600_2G_HYNIX IC101 MSD804KKX IC1201 H5TQ2G63DFR-PBC EAN61829203 N3 M8 A0 A1 A2 A3 A4 R1203 A5 L8 ZQ +1.5V_DDR 240 1% A7 A8 B2 10V 10uF C1205 D9 10V 10uF C1227 G7 C1207 0.
FULL SCART SCART AMP +12V COMPONENT & AV NOT USE TP(LN52) EU C2817 0.1uF 50V AV_CVBS_DET IC2801 AZ4580MTR-E1 EU R2861 2.2K OUT1 DTV/MNT_L_OUT EU C2821 10uF 16V EU R2866 33K OPT R2865 470K EU C2823 33pF IN1- EU R2868 10K 8 1 IN1+ VEE VCC EU 2 7 OUT2 3 6 IN2- 4 5 IN2+ EU R2867 33K EU R2869 10K EU C2822 10uF 16V DTV/MNT_R_OUT OPT R2864 470K EU C2824 33pF EU R2862 5.6K EU R2863 5.6K SCART1_Lout EU 330pF C2819 EU R2860 2.
HDMI(REAR 2 Without MHL) HDMI_2 HDMI_1(ARC) 5V_HDMI_1 5V_HDMI_2 5V_DET_HDMI_2 5V_DET_HDMI_1 ESD_HDMI VA800 ESD_HDMI D808 R809 10K R804 10K R800 1K R802 1K C C ESD_HDMI D809 Q801 MMBT3904(NXP) B ESD_HDMI VA802 R806 10K JK800 R829 100 ESD_HDMI 5V D810 R803 1.
L13 Adapter POWER BLOCK Power_DET ADAPTER JACK +24V_LED_DRIVER JK400 KJA-DC-1-0032 4 4 2 2 PD_+12V --> 3.69V PD_+24V_ADAPTER --> 3.81V +24V_ADAPTER L421 UBW2012-121F +24V_ADAPTER PD_+24V_ADAPTER R494 27K 1% 1 +3.5V_ST +12V R488 100K PD_+12V R450 2.7K 1% VCC C411 0.1uF 16V PD_+24V_ADAPTER R495 5.1K 1% 3 RESET 2 RESET_IC_SOC_RESET R463 10K +3.5V_SOC_RESET R402-*1 100 PWR_DET_ON_SEMI IC408 NCP803SN293 RESET_IC_SOC_RESET R402 300 POWER_DET 1 PD_+12V R496 1.2K 1% C474 0.
32inch_Adapter T6900 13I-DD01 L6900 D6903 BFS3550R2BD8G SF20D600D2 A2 PATTERN WIDTH 10mm 1 To bo obsolete 4 C +24V_LED_DRIVER L6901 BFS3550R2BD8G A1 OPT C6916 10uF 35V 42inch_Adapter C6915 470uF 35V NRA C6900 470uF 35V NRA OPT C6917 10uF 35V OPT C6918 10uF 35V C6919 10uF 35V OPT C6925 1000pF 630V C6924 1000pF 630V 3 2 32inch_Adapter 32inch_Adapter 42inch_Adapter C6907 33uF 160V NRA 42inch_Adapter T6900-*1 13I-DD02 1 3 R6979 150 R6978 R6977 150 150 R6976 150 R6975 150 R6974 150 R6973
MODEL OPTION MODEL OPTION 1K 1K MODEL_OPT_HD R226 R211 MODEL_OPT_0 R203 Memory OPTION PIN NO. LOW MODEL_OPT_4 MODEL_OPT_6 PIN NO. U23 PIN NO. B8 128M 0 0 128M+128M 0 1 256M 1 0 256M+128M 1 1 HIGH Memory MODEL_OPT_AJ 1K 1K PIN NAME +3.3V_Normal MODEL_OPT_DVB_T2(O) R208 R206 MODEL_OPT_M120(O) MODEL_OPT_MIU0_2G 1K 1K +2.5V_Normal R221 1K MODEL_OPT_DVB_S(O) R222 R291 MODEL_OPT_MIU1_1G MODEL_OPT_DUAL(O) R290 R201 OPT 1K 1K +2.5V_Normal +3.
LN52_LVDS (EU) FOR FHD REVERSE(10bit) Change in S7LR MIRROR [51Pin LVDS Non-Reverse Connector] (For FHD 60Hz) FHD P1100 Pol-change RXA4+ RXA0+ RXA0- RXA4- RXA0- RXA0+ RXA1- [30Pin LVDS Connector] (For HD 60Hz_Normal) RXA3+ RXA1+ RXA3- RXA1- RXA1+ HD RXACK+ RXA2+ RXA2- 10031HR-30 P1101 FI-RE51S-HF-J-R1500 PANEL_POWER RXACK- RXA2- RXA2+ 1 RXA2+ RXACK+ RXACK- 2 RXA2- RXACK- RXACK+ 3 RXA1+ RXA3+ RXA3- 4 RXA1- RXA3- RXA3+ 5 RXA0+ RXA4+ RXA4- 6 RXA0- RXA4- RXA4+ 1
IC102 K9F1G08U0D-SCB0 NC_9 NC_10 CLE ALE /PF_CE1 PF_ALE WE /PF_WE WP /PF_WP AR104 22 NC_11 R106 1K NC_12 NC_13 R102 3.3K NC_14 NC_15 36 14 35 15 34 16 33 17 32 18 31 19 30 29 20 21 28 22 27 23 26 24 25 VCC_2 10uF 10V CAP_10uF_X7R C103 0.
Close to the tuner NETCAST4.0_EU_TUNER_BLOCK This was being applied to the only china demod, so this has to be deleted in both main and ISDB sheet. +3.3V_TU IF_AGC_SEL IC2603 AP1117E18G-13 TU2601 TDSS-G501D(B) LNA2_CTL +1.8V_TU TU_SIF TU_CVBS INADJ/GND +3.3V_TU OUT R2614 100K R2611 100 R2632 1 TUNER_RESET C2622 0.1uF 16V 1 2 3 4 5 6 7 8 9 10 11 B1 B1 A1 NC_1 RESET TU_I2C_FILTER R2609-*1 MLG1005SR27JT OPT C2653 20pF 50V Vo=VREF*(1+R2/R1) +3.3V_TU VREF=1.25V C2641 0.
Standard Repair Process LCD TV Error symptom A. Video error Established date No video/ Normal audio Revised date 2013. 01 .09 1/14 First of all, Check whether all of cables between board is inserted properly or not.
Standard Repair Process LCD TV Error symptom A. Video error Established date No video/ No audio Revised date ☞A4 No Video/ No audio Check DC24V from Adapter Normal voltage? Y N 2013. 01 .09 2/14 Check and replace MAIN B/D End Replace Power Board and repair parts Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process LCD TV ☞ A5 Check RF Signal level Normal Signal? Y Established date A. Video error Error symptom Picture broken/ Freezing 2013. 01 .09 Revised date 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? Y N Established date A. Video error Tuning fail, Picture broken/ Freezing 2013. 01 .09 Revised date 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 A. Video error Established date Color error Revised date 2013. 01 .
Standard Repair Process LCD TV Established date A. Video error Error symptom Vertical / Horizontal bar, residual image, light spot, external device color error 2013. 01 .
Standard Repair Process LCD TV Error symptom ☞A11 Check Power LED . Stand-By : Red Y Power LED On? B. Power error Established date No power Revised date 2013. 01 .09 7/14 ☞A13 DC Power on by pressing Power Key On Remote control Normal N operation? N Y Check Power On ‘”High” Replace Adapter OK? Y Check Power cord was inserted properly Replace Main B/D ☞A4 Measure DC 24V from Adapter N Normal? Y Close ※ ☞A12 Check ST-BY 3.
Standard Repair Process LCD TV Established date B. Power error Error symptom Off when on, off while viewing, power auto on/off 2013. 01 .09 Revised date 8/14 Check outlet ☞A14 N Check A/C cord Error? Check Power Off Mode CPU Abnormal Replace Main B/D Normal? Y Abnormal 1 Replace Adapter ☞A13 Fix A/C cord & Outlet and check each 3 phase out (If Power Off mode is not displayed) Check Adapter voltage ※ Caution Check and fix exterior of Power B/D Part Copyright © 2013 LG Electronics. Inc.
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 2013. 01 .09 9/14 ☞A4 N Off Normal voltage Check DC24V from Adapter Y N Cancel OFF Check Speaker disconnection Y Replace Adapter N Disconnection Replace Main B/D End Y Replace Speaker Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process LCD TV Error symptom C. Audio error Wrecked audio/ discontinuation/noise Established date 2013. 01 .
Standard Repair Process LCD TV Established date D. Function error Error symptom Remote control & Local switch checking 2013. 01 .09 Revised date 11/14 - Remote control(R/C) operating error Replace Main B/D ☞A16 Check R/C itself Operation Check & Repair Cable connection Connector solder Normal Y operating? N Normal operating? N 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 D. Function error Error symptom External device recognition error Signal input? Y N Check and fix external device/cable Copyright © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes Check technical information - Fix information - S/W Version Technical N information? Established date 2013. 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 Main B/D Check location of noise 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 related to nose” in the Owner’s Manual.
Standard Repair Process LCD TV Error symptom Zoom part with exterior damage Exterior defect Revised date Module damage Replace module Cabinet damage Replace cabinet Remote controller damage 2013. 01 .09 14/14 Replace remote controller Stand dent Copyright © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes Established date F.
Contents of LCD TV Standard Repair Process Detail Technical Manual No.
Contents of LCD TV Standard Repair Process Detail Technical Manual Continued from previous page No. Error symptom 21 Content Page Check front display LED A11 Check power input Voltage & ST-BY 3.5V A12 23 Checking method when power is ON A13 24 POWER BOARD voltage measuring method A4 22 Remarks B. Power error_No power 26 B. Power error_Off when on, off while viewing POWER OFF MODE checking method A14 27 C.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_No video/Normal audio Content Check Back Light On with naked eye Established date Revised date 2013. 01 .09 A1 Power On -> disjoint back case -> check lighting at 2 points. Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_No video/Normal audio Content Inverter B+ 24V measuring method Established date Revised date 2013. 01 .09 A2 Measure DC 85_175V applying to Module from Power Board. Output 85~175V from Power Board -> supply to Module. Check Pin contacting statement and connection statement. Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_No video/Normal audio Content Check White Balance value Established date Revised date 2013. 01 .09 A3 Entry method 1. Press the ADJ button on the remote controller for adjustment. 2. Enter into White Balance of item 9. 3. After recording the R, G, B (GAIN, Cut) value of Color Temp (Cool/Medium/Warm), reenter the value after replacing the MAIN BOARD. Copyright © 2013 LG Electronics. Inc.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_No video/ Audio Content Power Board voltage measuring method Established date Revised date 2013. 01 .09 A4 Check the DC 24V (L421) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_Video error, video lag/stop Content TUNER input signal strength checking method Established date Revised date 2013. 01 .09 A5 MENU => Press red key Remote controller=>signal test => Select channel When the signal is strong, use the attenuator (-10dB, -15dB, -20dB etc.) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_Video error, video lag/stop LCD-TV Version checking method Content Established date Revised date 2013. 01 .09 A6 1. Checking method for remote controller for adjustment Version Press the IN-START with the remote controller for adjustment Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom Content A. Video error _Vertical/Horizontal bar, residual image, light spot LCD TV connection diagram (1) Established date Revised date 2013. 01 .09 A7 As the part connecting to the external input, check the screen condition by signal Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom Content A. Video error_Color error Check and replace Link Cable(LVDS) and contact condition Established date Revised date 2013. 01 .09 A8/A9 1. Check and replace LVDS Cable 2. Check LVDS connection condition Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom A. Video error_Color error Content Adjustment Test pattern - ADJ Key Established date Revised date 2013. 01 .09 A10 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!) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Appendix : Exchange T-Con Board (1) Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken Solder defect, CNT Broken T-Con T-Con Defect, Defect, CNT CNT Broken Broken Solder defect, CNT Broken T-Con Defect, CNT Broken Abnormal Power Section Solder defect, Short/Crack Copyright © 2013 LG Electronics. Inc. All rights reserved.
Appendix : Exchange T-Con Board (2) Abnormal Power Section Solder defect, Short/Crack GRADATION Copyright © 2013 LG Electronics. Inc. All rights reserved.
Appendix : Exchange PSU(LED driver) No Light Dim Light Dim Light Dim Light No picture/Sound Ok Copyright © 2013 LG Electronics. Inc. All rights reserved.
Appendix : Exchange the Module (1) Panel Mura, Light leakage Crosstalk Panel Mura, Light leakage Press damage Press damage Crosstalk Un-repairable Cases In this case please exchange the module. Press damage Copyright © 2013 LG Electronics. Inc. All rights reserved.
Appendix : Exchange the Module (2) Vertical Block Source TAB IC Defect Horizontal Block Gate TAB IC Defect Vertical Line Source TAB IC Defect Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Vertical Block Source TAB IC Defect Horizontal line Gate TAB IC Defect Gate TAB IC Defect Un-repairable Cases In this case please exchange the module. Horizontal Block Gate TAB IC Defect Gate TAB IC Defect Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom B. Power error _No power Content Check front display LED Established date Revised date 2013. 01 .09 A11 Front LED control : Menu Option Standby light ON ST-BY condition: Red Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom B. Power error _No power Content Check power input voltage and ST-BY 3.5V 2013. 01 .09 A12 Check the ST-BY 3.3V (L405) Check the DC 24V (L421) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom B. Power error _No power Content Checking method when power is ON 2013. 01 .09 A13 Check the LED_ON HIGH (IC6900, pin No. 1) Check the DC 24V (L421) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom B. Power error _Off when on, off whiling viewing Content POWER OFF MODE checking method Established date Revised date 2013. 01 .09 A14 Entry method 1. Press the IN-START button of the remote controller for adjustment 2. Check the entry into adjustment item 3 Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom Content Established date Revised Voltage and speaker checking method when there is no audio date C. Audio error_No audio/Normal video 2013. 01 .09 A15 Check the DC 24V (L3401) Copyright © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process Detail Technical Manual LCD TV Error symptom D. Function error_ No response in remote controller, key error Content Remote controller operation checking method Established date Revised date 2013. 01 .09 A16 P600 ③ ① 1 2 3 4 5 6 7 8 GND KEY1 KEY2 3.5V_ST GND LED_R IR GND ① ② Checking order 1. Check IR cable condition between IR & Main board. 2. Check the st-by 3.5V on the terminal 4. 3.