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 : LD31B/LD36B MODEL : 39LN54** 39LN54**-Z* 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 .............................................................. 10 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. 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 LD31B/ LD36B 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. 1 Resolution 720*576 H-freq(kHz) 15.625 V-freq(Hz) 50.00 13.5 Proposed SDTV ,DVD 576I 2 720*480 15.73 60.00 13.5135 SDTV ,DVD 480I 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 720*480 720*576 720*480 720*480 1280*720 1280*720 1280*720 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 1920*1080 15.73 31.25 31.50 31.47 37.50 45.00 44.96 28.125 33.75 33.72 56.25 67.50 67.432 27.00 26.97 33.
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 LED TV with LD31B / LD36B 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 * 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. 1) TV 2) AV (SCART / CVBS) 3) COMPONENT (480i) 4) HDMI * Display and Sound check is executed by Remote control.
* 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". 4.2. 3D function test (Pattern Generator MSHG-600, MSPG-6100[Support HDMI1.4]) * HDMI mode NO. 872 , pattern No.83 (1) Please input 3D test pattern like below. EZ ADJUST 0. Tool Option1 Whit Balance 1. Tool Option2 2. Tool Option3 Color Temp. 3. Tool Option4 R-Gain ◄ 4. Tool Option5 G-Gain 172 5.
4.4. MHL Test (1) Turn on TV (2) Select HDMI2 mode using input Menu. (3) Set MHL Zig(M1S0D3617) using MHL input, output and power cord. (4) Connect HDMI cable between MHL Zig and HDMI4 port. 6. Model name & Serial number D/L ▪ Press "Power on" key of service remote control. (Baud rate : 115200 bps) ▪ Connect RS232 Signal Cable to RS-232 Jack. ▪ Write Serial number ▪M ust check the serial number at the Diagnostics of SET UP menu. (Refer to below). 6.1. Signal Table CMD 4.5.
* Manual Download(Model Name and Serial Number) If the TV set is downloaded by OTA or Service man, sometimes model name or serial number is initialized.(Not always) There is impossible to download by bar code scan, so It need Manual download. 1) Press the "Instart" key of Adjustment remote control. 2) Go to the menu "6.Model Number D/L" like below photo. 3) Input the Factory model name or Serial number like photo. 7. MAC Address & CI+ key download 7.1 MAC Address 7.1.
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 automatic IP ▪ Setting state confirmation -> If automatic setting is finished, you confirm IP and MAC Address. 7.3. LAN PORT INSPECTION(PING TEST) Connect SET -> LAN port == PC -> LAN Port SET PC 7.3.1. Equipment setting (1) Play the LAN Port Test PROGRAM.
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 A10 Set + Stand A9 Stand Base + Stand Body A2 300 301 500 900 910 200 122 123 530 LV1 540 120 521 510 400 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 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.
Memory OPTION MODEL OPTION MODEL_OPT_0 MODEL_OPT_1 100 RF_SWITCH_CTL PIN NO. MODEL_OPT_3 PIN NO. B8 128M 0 0 128M+128M 0 1 256M 1 0 256M+128M 1 1 Note +1.10V_VDDC VDDC 1.05V +1.10V_VDDC VDDC : 2026mA MODEL_OPT_5 T24 NON_DVB_S DVB_S MODEL_OPT_6 B8 MIU1-NO_DDR MIU1-128M MODEL_OPT_7 A8 NON_DUAL_STREAM DUAL_STREAM 0.
L13 POWER BLOCK (POWER DETECT 2) PANEL_POWER FROM LIPS & POWER B/D +3.5V_ST --> 3.375V --> 3.46V +24V --> 3.78V --> 3.92V (3.79V) +12V --> 3.58V --> 3.82V (3.68V) Power_DET R402-*1 100 +12V +3.5V_SOC_RESET +12V L412 120 CIS21J121 Q402 +3.3V_Normal +3.5V_ST 3 R461 10K 2 R415 100 R426 10K R401 10K R462 10K R405 5.6K Q407 MMBT3904(NXP) B E POWER_DET_RESET Q405 MMBT3904(NXP) C406 0.1uF 16V PWR ON 1 2 DRV ON 3.5V 3 4 PDIM#1 3.5V CIC21J501NE L407 +24V C418 0.
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 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.
HDMI (REAR 1 / SIDE 1 MHL) HDMI_1 SIDE_HDMI (MHL) 5V_HDMI_4 GND BODY_SHIELD 5V_DET_HDMI_2 R807 20 19 R830 HP_DET 19 R803 HPD2 VA802 ESD_HDMI 3.3K 1.
SPDIF SPDIF OPTIC JACK +3.3V_Normal 5.15 Mstar Circuit Application 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.
AVDD_DDR0 1uF 0.1uF C1220 1uF C1241 1uF C1238 1uF C1219 1uF C1218 C1217 0.1uF 0.1uF C1239 C1206 L1202 CIC21J501NE C1251 R1227 R1228 +1.5V_DDR 10uF10V 2_DDR 1K 1% C1250 2_DDR 1K 1% C1249 2_DDR 0.1uF 2_DDR1000pF R1225 C1247 C1248 2_DDR 1K 1% 2_DDR 0.1uF OPT CLose to DDR3 DDR_1600_1G_SS DDR_1600_1G_SS IC1202 K4B1G1646G-BCK0 S7LR-M_NON_MS10 IC1201 K4B1G1646G-BCK0 IC101 MSD804KKX EAN61836301 EAN61836301 A3 VREFDQ A4 A5 L8 A6 ZQ A7 A8 B2 G7 C1208 0.
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.
Headphone *Option : HEAD_PHONE HEAD_PHONE HP_LOUT +3.5V_ST R1505 1K 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 HEAD_PHONE_POP JK1500 KJA-PH-0-0177 +3.
CI Region * Option name of this page : CI_SLOT (because of Hong Kong) CI SLOT CI TS INPUT AR1905 33 FE_TS_DATA[7] CI_MDI[7] CI_DATA[0-7] FE_TS_DATA[6] CI_MDI[6] FE_TS_DATA[5] CI_MDI[5] FE_TS_DATA[4] CI_DATA[0-7] CI_MDI[4] +5V_Normal C1906 10uF 10V R1903 10K CI_SLOT_JACK P1901 10067972-000LF +5V_Normal R1909 10K 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 43 9 CI_IORD 44 10 CI_IOWR 45 11 46 12 CI_MDI[0] 47 13 48 14
ETHERNET * H/W option : ETHERNET +2.5V_Normal ETHERNET L2101 BLM18PG121SN1D RJ45VT-01SN002 XRJV-01V-0-D12-080 1 2 3 4 5 6 7 8 1 2 3 4 ETHERNET_XMULTIPLE JK2100 ETHERNET_XML_EMI JK2100-*1 1 R2101 49.9 2 ETHERNET R2102 49.9 C2101 0.1uF ETHERNET 3 EPHY_TN 4 5 EPHY_RP ETHERNET R2103 49.9 ETHERNET R2104 49.9 5 6 6 7 C2102 0.1uF ETHERNET EPHY_RN 7 8 9 EPHY_TP ETHERNET 8 9 9 9 ETHERNET C2104 0.
NETCAST4.0 EU&CHUNA_TUNER_BLOCK ERROR & VALID PIN FE_TS_VAL_ERR RF_SWITCH_CTL TU2603 TDSS-G501D FE_TS_ERR +3.3V_TU Close to TUNER C2603 0.1uF 16V RF_SW_OPT TU2601 TDSQ-G501D TU2602 TDSQ-G601D R2628 0 FE_TS_VAL RF_SW_OPT R2603 0 GPIO must be added. R2614 100K R2611 100 TUNER_RESET 1 RESET 2 3 TU2604 TDSM-C601D SDA 4 4 3.3V 5 5 ALIF_[N] 6 6 1.
DVB-S2 LNB Part Allegro (Option:LNB) Input trace widths should be sized to conduct at least 3A Ouput trace widths should be sized to conduct at least 2A 3A +12V_LNB 2A D2705-*1 Max 1.3A 40V LNB_SX34 3.5A 30V SP-7850_15 15uH D2705 C2704 10uF 25V LNB C2705 10uF 25V LNB C2706 10uF 25V LNB close to Boost pin(#1) C2708 10uF 25V LNB A_GND LNB C2703 0.01uF 50V LNB C2707 0.1uF 40V LNB_SMAB34 L2702 LNB D2703 LNB A_GND LX VIN 14 GND 13 VREG R2703 36K ISET TCAP 0.
NC_1 NC_2 NC_3 NC_4 NC_5 NC_6 NC_7 L3402 10uH R3408 43 13 14 15 16 17 18 NC_8 19 20 NC_9 NC_10 21 NC_11 22 24 +3.3V_Normal 23 NC_12 AUDIO AMP(STA380BWEF) 12 GND_REG AUD_SCK C3414 330pF 50V R3410 43 R3411 43 [EP] 48 VDDDIG2 47 C3408 0.1uF 16V C3426 1000pF 50V C3419 0.22uF 50V C3423 0.22uF 50V C3427 1000pF 50V SPEAKER_R L3405 10uH L3401 CIS21J121 +3.3V_Normal SPK_R+ SPK_R- +24V 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.
LVDS (EU) [51Pin LVDS Connector] (For FHD 60Hz) FOR FHD REVERSE(10bit) [30Pin LVDS Connector] (For HD 60Hz_Normal) Change in S7LR HD FHD MIRROR P1100 Pol-change P1101 FF10001-30 FI-RE51S-HF-J-R1500 RXA4+ RXA0+ RXA0- RXA4- RXA0- RXA0+ RXA3+ RXA1+ RXA1- RXA3- RXA1- RXA1+ RXACK+ RXA2+ RXA2- RXACK- RXA2- RXA2+ RXA2+ RXACK+ RXACK- 1 1 2 2 LVDS_SEL 3 3 +3.3V_Normal 4 4 5 5 OPT R1100 3.
SCART / COMPONENT&COMPSIT SCART AMP COMPONENT +12V JK2802 PPJ245-02 7E [GN]E-LUG 6E [GN]C-SPRING 4E [GN]CONTACT D2820 ESD_COMP_ZENER_ROHM 5D [BL]C-SPRING D2821 ESD_COMP_ZENER_ROHM 4C 6C +3.3V_Normal [RD2]CONTACT [RD2]E-LUG-S 5B [WH]C-SPRING D2822-*1 ESD_COMP_ZENER_KEC AV_CVBS_DET OPT C2802 0.
Standard Repair Process Error symptom LCD TV 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. (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 24v, 12v,3.5v etc.
Standard Repair Process LCD TV Error symptom A. Video error Established date No video/ No audio Revised date 2013. 01 .09 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 © 2013 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 2013. 01 .09 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 A. Video error Established date Tuning fail, Picture broken/ Freezing Revised date 2013. 01 .09 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 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 B. Power error Established date No power Revised date ☞A11 Check Power LED . Stand-By: Red 2013. 01 .09 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 Y Check Power cord was inserted properly Replace Main B/D ☞A4 Measure voltage of each output of Power B/D N Normal? Y Y ※ Close 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 .
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 ☞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 © 2013 LG Electronics. Inc. All rights reserved.
Standard Repair Process LCD TV C. Audio error Error symptom Wrecked audio/ discontinuation/noise Established date 2013. 01 .
Standard Repair Process Error symptom LCD TV D. Function error Established date Remote control & Local switch checking Revised date 2013. 01 .09 11/14 1. Remote control(R/C) operating error ☞A17 Check R/C itself Operation ☞A17 Check & Repair Cable connection Connector solder Normal Y operating? 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 Signal input? Established date D. Function error Error symptom External device recognition error 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 information? 2013. 01 .
Standard Repair Process LCD TV Error symptom E. Noise Established date Circuit noise, mechanical noise Revised date 2013. 01 .09 13/14 Replace PSU(with LED driver) Identify nose type Circuit noise Check location of noise Mechanical noise 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 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 © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes Established date Revised date 2013. 01 .
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 Content Page 21 Check front display LED A11 22 Check power input Voltage & ST-BY 3.5V A12 Checking method when power is ON A13 POWER BOARD voltage measuring method A4 POWER OFF MODE checking method A14 Checking method in menu when there is no audio A15 Voltage and speaker checking method when there is no audio A16 23 B. Power error_No power 24 Remarks 25 26 B.
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 93.2~118.5V applying to Module from Power Board. Output 93.2~118.5V 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 7. 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 Edge LED Check the DC 24V, 12V, 3.5V. 18 Pin (Power Board ↔ Main Board) - Common Copyright © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes 1 Power on 2 DRV ON 3 3.5V 4 PDIM#1 5 3.
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 Content A. Video error_Video error, video lag/stop LCD-TV Version checking method 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 Established date Revised date 2013. 01 .09 A12 Edge LED Check the DC 24V, 12V, 3.5V. 18 Pin (Power Board ↔ Main Board) - Common Copyright © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes 1 Power on 2 DRV ON 3 3.5V 4 PDIM#1 5 3.
Standard Repair Process Detail Technical Manual LCD TV Error symptom B. Power error _No power Content Checking method when power is ON Established date Revised date 2013. 01 .09 A13 Edge LED Check the DC 24V, 12V, 3.5V. 18 Pin (Power Board ↔ Main Board) - Common Copyright © 2013 LG Electronics. Inc. All rights reserved. Only for training and service purposes 1 Power on 2 DRV ON 3 3.5V 4 PDIM#1 5 3.
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 Error symptom LCD TV Content C. Audio error_No audio/Normal video Checking method in menu when there is no audio Established date Revised date 2013. 01 .09 A15 Checking method 1. Press the MENU button on the remote controller 2. Select the AUDIO function of the Menu 3. Select Sound Out – TV Speaker *If you set Sound-Out menu as External Speaker/LG Sound Sync, TV Speaker will not work. Copyright © 2013 LG Electronics. Inc.
Standard Repair Process Detail Technical Manual LCD TV Error symptom C. Audio error_No audio/Normal video Content Voltage and speaker checking method when there is no audio Established date Revised date Check the DC 24V, 12V, 3.5V. 2013. 01 .09 A16 ① 18 Pin (Power Board ↔ Main Board) - 공통 ② ② 1 Power on 2 DRV ON 3 3.5V 4 PDIM#1 5 3.5V 6 PDIM#2 7 GND 8 GND 9 24V 10 24V 11 GND 12 GND 13 12V 14 12V 15 12V 16 N.
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 A17 ② P600 ③ ④ ① ② 1 2 3 4 5 6 7 8 9 GND KEY1 KEY2 3.5V_ST GND LED_R/BUZZ IR GND GND Checking order 1, 2. Check IR cable condition between IR & Main board. 3. Check the st-by 3.5V on the terminal 4. 4.