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Internal Use Only
North/Latin America http://aic.lgservice.com
Europe/Africa http://eic.lgservice.com
Asia/Oceania http://biz.lgservice.com
LED LCD TV
SERVICE MANUAL
CHASSIS : LD2AC
MODEL : 37LT360C 37LT360C-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67368106 (1205-REV00) Printed in Korea
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CONTENTS CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SERVICING PRECAUTIONS ................................................................... 4 SPECIFICATION ...................................................................................... 6 ADJUSTMENT INSTRUCTION ............................................................... 9 TR
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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 LD2AC 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 6 RGB Input RGB-PC Analog(D-SUB 15PIN) HDMI1-DTV/DVI PC(HDMI version 1.3) 7 HDMI Input (3EA) HDMI2-DTV Support HDCP HDMI3-DTV The number of Input ports is different by model. 8 Audio Input (1EA) RGB/DVI Audio In case of the RGB/DVI Audio input, 9 SDPIF out (1EA) SPDIF out EMF, 10 USB (1EA ) DivX HD, JPEG, MP3, DivX HD For SVC (download) CI : UK, Finland, Denmark, Norway , Sweden, Russia, DVB-T Spain, Ireland, Luxemburg, Belgium, Netherland CI+ : France(Canal+), I
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5.2. RGB Input (PC) No. Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed 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 1280*768 47.776 59.870 79.50 CVT(WXGA) X 7 1360*768 47.712 60.015 85.50 VESA (WXGA) X 8 1280*1024 63.981 60.020 108.0 VESA (SXGA) O 9 1600*1200 75.00 60.00 162.0 VESA (UXGA) X 10 1920*1080 66.587 59.934 138.5 HDTV
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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 LD2AC 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 4. Total Assembly line process (1) ADC 4.1. Adjustment Preparation - Enter Service Mode by pushing "ADJ" key, ▪ W/B Equipment condition - Enter Internal ADC mode by pushing "►" key at "7. ADC CA210 Calibration". : CCFL/EEFL -> CH9, Test signal: Inner pattern(80IRE) EZ ADJUST ADC Calibration LED -> CH14, Test signal: Inner pattern(80IRE) 0. Tool Option1 ADC Comp 480i NG ▪ Above 5 minutes H/run in the inner pattern. (“power on” key 1. Tool Option2 ADC Comp 1080p NG of adjus
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▪ Auto adjustment Map(using RS-232C to USB cable) 4.4. EDID data RS-232C COMMAND (1) All Data : HEXA Value [CMD ID DATA] (2) Changeable Data : Wb 00 00 White Balance Start *: Serial No : Controlled / Data:01 Wb 00 ff White Balance End **: Month : Controlled / Data:00 ***:Year : Controlled RS-232C COMMAND CENTER [CMD ID DATA] (DEFAULT) ****:Check sum MIN MAX Cool Mid Warm Cool Mid Warm 4.4.1. Auto Download R Gain jg Ja jd 00 172 192 192 192 ■ After enter Service Mode by pushing
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Gate Drive IC Interface (1) FHD RGB EDID data f. Vendor Specific(HDMI) 0 1 2 3 4 5 6 7 8 9 A B C D E F Input Model name(HEX) 00 00 FF FF FF FF FF FF 00 1E 6D a b 10 c 01 03 68 A0 5A 78 0A EE 91 A3 54 4C 99 26 HDMI1 67030C001000 20 0F 50 54 A1 08 00 31 40 45 40 61 40 71 40 81 80 HDMI2 67030C002000 30 01 01 01 01 01 01 02 3A 80 18 71 38 2D 40 58 2C 40 45 00 A0 5A 00 00 00 1E 66 21 50 B0 51 00 1B 30 HDMI3 67030C003000 50 40 70 36 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20
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4) Check the model name Instart menu. → Factory name displayed. 5. Model name & Serial number D/L (ex 42LD450-ZA) ▪ Press "Power on" key of service remote control. 5) Check the Diagnostics.(DTV country only) → Buyer model (Baud rate : 115200 bps) displayed.(ex 42LD450) ▪ Connect RS232 Signal Cable to RS-232 Jack. ▪ Write Serial number by use RS-232. ▪ M ust check the serial number at the Diagnostics of SET UP menu. (Refer to below). 5.1. Signal Table CMD LENGTH ADH ADL DATA_1 . . . Data_n C
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2. Check the method of CI+ key value (RS232) 6. CI+ Key Download method 1) Into the main ass’y mode (RS232 : aa 00 00) 6.1. Download Procedure CMD 1 CMD 2 Data 0 (1) Press "Power on" key of a service R/C. A A 0 0 (Baud rate : 115200 bps) (2) Connect RS232-C Signal Cable. 2) Check the mothed of CI+ key by command (3) Write CI+ Key through RS-232-C. (RS232 : ci 00 20) (4) Check whether the key was downloaded or not at ‘In Start’ CMD 1 CMD 2 Data 0 menu. (Refer to below). C I 2 0 3) resu
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TROUBLE SHOOTING 1. Check the booting Voltage 2. Digital TV Video Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 15 - Only for training and service purposes
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3. Analog TV Video 4. AV Video Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 16 - Only for training and service purposes
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5. RGB Video 6. HDMI Video Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 17 - Only for training and service purposes
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7. Audio of All iput 8. TV Audio Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 18 - Only for training and service purposes
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9. AV Audio 10. RGB Audio Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 19 - Only for training and service purposes
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BLOCK DIAGRAM Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 20 - Only for training and service purposes
