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Internal Use Only
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LED LCD TV
SERVICE MANUAL
CHASSIS : LD21A
MODEL : 19LS3500/350S/350T
MODEL : 19LS3500/350S/350T-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67360701 (1202-REV00) Printed in Korea
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CONTENTS CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SERVICING PRECAUTIONS ................................................................... 4 SPECIFICATION ...................................................................................... 6 ADJUSTMENT INSTRUCTION ............................................................... 9 DI
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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. General Guidance Leakage Current Hot Check
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SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service 2. After removing an electrical assembly equipped with ES manual and its supplements and addenda, read and follow the devices, place the assembly on a conductive surface such as SAFETY PRECAUTIONS on page 3 of this publication. aluminum foil, to prevent electrostatic charge buildup or expo- NOTE: If unforeseen circumstances create conflict between the sure of the assembly. following servicing precautions and any
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IC Remove/Replacement 3. Solder the connections. Some chassis circuit boards have slotted holes (oblong) through CAUTION: Maintain original spacing between the replaced which the IC leads are inserted and then bent flat against the cir- component and adjacent components and the circuit board to cuit foil. When holes are the slotted type, the following technique prevent excessive component temperatures. should be used to remove and replace the IC. When working with boards using the familiar r
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SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range 3. Test method This specification is applied to the LCD TV used LD21A 1) Performance: LGE TV test method followed chassis. 2) Demanded other specification - Safety : CE, IEC specification - EMC : CE, IEC 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 %
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No. Item Specification Remarks 1) PAL-BG 2) PAL-DK 2 Broadcasting system 3) PAL-I/I’ 4) SECAM L/L’ 5) DVB-T/T2/C/S ► DVB-T - Guard Interval(Bitrate_Mbit/s) 1/4, 1/8, 1/16, 1/32 - Modulation : Code Rate QPSK : 1/2, 2/3, 3/4, 5/6, 7/8 16-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 64-QAM : 1/2, 2/3, 3/4, 5/6, 7/8 ► DVB-T2 - Guard Interval(Bitrate_Mbit/s) 1/4, 1/8, 1/16, 1/32, 1/128, 19/128, 19/256, - Modulation : Code Rate QPSK : 1/2, 2/5, 2/3, 3/4, 5/6 Analog : Upper Heterodyne 16-QAM
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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 74.25 HDTV 720P 9 1280*720 44.96 59.94 74.176 HDTV 720P 10 1920
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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*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 60.020 108.0 VESA (SXGA) O FHD only 9 1920*1080 67.50 60.00 148.5 HDTV 1080P O FHD only DTV 1 7
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ADJUSTMENT INSTRUCTION (4) Click "Connect" tab. If "Can't" is displayed, check connection 1. Application Range between computer, jig, and set. This specification sheet is applied to all of the LCD TV with LD21A 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. (4) Input signal Un
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3.1. ADC Process 3.3. EDID data (1) ADC (1) HD RGB EDID data (RGB input : only LD21B support) - Enter Service Mode by pushing "ADJ" key, 0 1 2 3 4 5 6 7 8 9 A B C D E F - Enter Internal ADC mode by pushing "►" key at "7. ADC 0 00 FF FF FF FF FF FF 00 1E 6D a b 10 c 01 03 68 10 09 78 0A EE 91 A3 54 4C 99 26 Calibration". 20 0F 50 54 A1 08 00 81 C0 61 40 45 40 31 40 01 01 EZ ADJUST ADC Calibration 30 01 01 01 01 01 01 1B 21 50 A0 51 00 1E 30 48 88 0. Tool Option1 ADC Comp 480i NG 40 35 00 A0 5A
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* Connecting picture of the measuring instrument 3.4 Function Check (On Automatic control) - Check display and sound Inside PATTERN is used when W/B is controlled. Connect to ■ Check Input and Signal items. auto controller or push Adjustment R/C POWER ON -> Enter 1) TV the mode of White-Balance, the pattern will come out. 2) AV (SCART / CVBS) 3) COMPONENT (480i) 4) RGB (PC : 1024 x 768 @ 60hz) (* RGB input : LD21B only support) Full White Pattern CA-210 5) HDMI COLOR 6) PC Audio In (* exce
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* Manual W/B process using adjust Remote control. 5. HI-POT Test ▪ After enter Service Mode by pushing "ADJ" key, 5.1. HI-POT auto-check preparation ▪ E nter White Balance by pushing " " key at "8. White ► - Check the POWER cable and SIGNAL cable insertion condition Balance". EZ ADJUST White Balance 5.2. HI-POT auto-check Cool Color Temp. 0. Tool Option1 (1) Pallet moves in the station. (POWER CORD / AV CORD is R-Gain 172 1. Tool Option2 G-Gain 172 2. Tool Option3 tightly inserted) B-Gain 19
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6.3. Method & notice 7. MAC Address & CI+ key download (1) Serial number D/L is using of scan equipment. 7.1 MAC Address (2) Setting of scan equipment operated by Manufacturing 7.1.1 Equipment & Condition Technology Group. (3) Serial number D/L must be conformed when it is produced in ▪ Play file : Serial.exe production line, because serial number D/L is mandatory by ▪ MAC Address edit D-book 4.0. ▪ Input Start / End MAC address * Manual Download(Model Name and Serial Number) 7.1.2 Download
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7.2 LAN Inspection 7.2.1. Equipment & Condition ▪ Each other connection to LAN Port of IP Hub and Jig 7.2.1. 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. (2) Input IP set up for an ins
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DISASSEMBLY 2 3 1 [Caution] Please unlock latches from Bottom Side, for separating Back Cover from CABINET [Method] Firstly , Grab left side of Speaker Vent Hole( ①) and then unlock left side latches( ②) slowly. Secondly, Grab center( ③) of Back Cover and then separate Back Cover slowly. Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 16 - Only for training and service purposes
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BLOCK DIAGRAM CI Slot Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 17 - Only for training and service purposes LVDS X-tal 24M FFC(HD 30P) X201 (HD 50Hz) ATV : IF +/ - SI2176 TU_CVBS SERIAL FLASH SPI IC1401 (8Mbit) SIF MX25L8006EM2I -12G DDR3 (1Gbit) DDR3 Add. TMDS IC1201 HDMI1/2(DVI) DDR3 Data K4B1G1646G BCK0 SERIAL FLASH I2C CVBS, Y/ Pb/Pr, L/R Component/AV IC104 ( 256Kbit) COMMON R1EX2425BSAS0A NAND FLASH IC102 (1Gbit) K9F1G08U0D- SCB0 PCM_A[0:7] L LG G2
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EXPLODED VIEW 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 X-RADIATION, Shock, Fire, or other Hazards. Do not modify the original design without permission of manufacturer. Copyright © LG Electronics. In
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Contents of LCD TV Standard Repair Process No. Error symptom (High category) Error symptom (Mid category) Page Remarks 1 No video/Normal audio 1 2 No video/No audio 2 3 Tuning fail, Picture broken/ Freezing 3, 4 A. Video error 4 Color error 5 Vertical/Horizontal bar, residual image, 5 6 light spot, external device color error 6 No power 7 B. Power error Off when on, off while viewing, power 7 8 auto on/off 8 No audio/Normal video 9 C. Audio error 9 Wrecked audio/discontinuation/noise 10 10 Re
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Contents of LCD TV Standard Repair Process Detail Technical Manual No. Error symptom Content Page Remarks 1 Check LCD back light with naked eye A1 2 LED driver B+ 24V measuring method A2 A. Video error_ No video/Normal audio 3 Check White Balance value A3 4 Power Board voltage measuring method A4 6 TUNER input signal strength checking method A5 A. Video error_ No video/Video lag/stop 7 LCD-TV Version checking method A6 9 LCD TV connection diagram A7 A8 Check Link Cable (LVDS) reconnection
