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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 : LD2AF
MODEL : 42LT640H 42LT640H-ZA
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : MFL67368114 (1205-REV00) Printed in Korea
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CONTENTS CONTENTS .............................................................................................. 2 SAFETY PRECAUTIONS ........................................................................ 3 SERVICING PRECAUTIONS ................................................................... 4 SPECIFICATION ...................................................................................... 6 ADJUSTMENT INSTRUCTION ............................................................. 10 BLO
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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 LD2AF 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 (2EA) RGB/DVI Audio In case of the RGB/DVI Audio input, 9 SDPIF out (1EA) SPDIF out Some models(LD21A,LD21C) are not supported. Antenna, AV1, AV2, Component, RGB, 10 Earphone out (1EA) . HDMI1, HDMI2, HDMI3 EMF, 11 USB (1EA ) DivX HD, JPEG, MP3, DivX HD For SVC (download) CI : U
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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*480 15.73 60.00 13.5135 SDTV ,DVD 480I 2 720*480 15.73 59.94 13.50 SDTV ,DVD 480I 3 720*480 31.50 60.00 27.027 SDTV 480P 4 720*480 31.47 59.94 27.00 SDTV 480P 5 1280*720 45.00 60.00 74.25 HDTV 720P 6 1280*720 44.96 59.94 74.176 HDTV 720P 7 1920*1080 33.75 60.00 74.25 HDTV 1080I 8 1920*1080 33.72 59.94 74.176 HDTV 1080I 9 1920*1080 67.50 60.00 148.50 HDTV 1080P 10
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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 1280*768 47.776 59.870 79.50 CVT(WXGA) Х 7 1360*768 47.712 60.015 85.50 VESA (WXGA) O 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 67.50
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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 LD2AF 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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(1) HD 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 10 09 78 0A EE 91 A3 54 4C 99 26 HDMI1 67030C001000B82D 20 0F 50 54 A1 08 00 81 80 61 40 45 40 31 40 01 01 HDMI2 67030C002000B82D 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 01 1D 00 72 51 D0 1E 20 HDMI3 67030C003000B82D 50 6E 28 55 00 A0 5A 00 00 00 1E 00 00 00 FD 00 3A 60 3E 1E 53 10 00 0A 20 20 20 20 20 20 d 70
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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) C heck 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. ▪ Must check the serial number at the Product/Service info.. (menu key -> red key -> select product/Service info) 5.1. Signal Table CMD LENGTH A
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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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BLOCK DIAGRAM B Bu uf ff fe er r B BIIu u C Cf f1 1 f fe e 9 9r r0 02 2 ( (P P1 19 90 01 1) ) C CII S Sllo ot t P Pr ro o: :IId diio om m S S0 00 01 1D D) ) T TU U3 37 70 02 2 - - T Tuner uner Copyright © LG Electronics. Inc. All rights reserved. LGE Internal Use Only - 16 - Only for training and service purposes X X- -t ta all 2 24 4M M B Bu uf ff fe er r B Bu uf ff fe er r P PII_ _T TS S_ _D DA AT TA A[ [0 0: :7 7] ] 7 74 4L LV VC C1 16 62 24 44 4 L LV VD DS S ( (8 8b biit t o or r 1 1
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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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IC102 NAND01GW3B2CN6E NAND FLASH MEMORY +3.3V_Normal IC101 +3.3V_Normal Boot from SPI CS1N(EXT_FLASH) 1’b0 LGE2112-T8 NC_1 NC_29 Boot from SPI_CS0N(INT_FLASH) 1’b1 1 48 NAND_FLASH_1G_NUMONYX PCM_D[0-7] NC_2 NC_28 EAN60762401 2 47 S7LR_DIVX_MS10 PCM_A[0-7] PCM_D[0] W21 NC_3 NC_27 PCMDATA[0]/GPIO126 3 46 PCM_D[1] AA18 22 PCMDATA[1]/GPIO127 NC_4 NC_26 PCM_D[2] AB22 4 45 AR101 PCMDATA[2]/GPIO128 PCM_D[3] AE20 NC_5 I/O7 PCM_A[7] PCMDATA[3]/GPIO120 R107 R109 5 44 PCM
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AUDIO OUT I2S_I/F AUDIO IN MODEL OPTION +2.5V_Normal +3.3V_Normal +3.3V_Normal PIN NAME PIN NO. LOW HIGH MODEL OPTION +1.10V_VDDC +1.10V_VDDC MODEL_OPT_0 AB3 FHD HD VDDC 1.05V VDDC : 2026mA MODEL_OPT_1 PHM_ON F4 PHM_OFF MODEL_OPT_2 AB2 NON_DVB_T2 DVB_T2 MODEL_OPT_3 T25 NON_3D 3D OPT R201 100 MODEL_OPT_0 OPT OPT OPT OPT OPT R202 100 MODEL_OPT_4 U23 NON_OLED OLED MODEL_OPT_1 OPT R203 100 MODEL_OPT_2 MODEL_OPT_5 OPT T24 NON_DVB_S R204 100 DVB_S MODEL_OPT_3 OPT R4031 100 MODEL_OPT_4 MODEL_OPT_6 B8 N
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MICOM MODEL OPTION +3.5V_ST +3.5V_ST +3.5V_ST IC302 74LX1G14CTR NC VCC MODEL1_OPT_0 R352 1 5 47K MODEL1_OPT_1 C309 BU300 MODEL1_OPT_2 1A 0.1uF PKLCS1212E4001-R1 +3.5V_ST SW300 2 16V MODEL_OPT_3 JTP-1127WEM 2 1 GND 1Y X300 3 4 1 C308 10MHz 2.2uF 43 10V 2 SIGN190368 +5V_ST R348 100K L302 +3.5V_ST BLM18PG121SN1D P301 Q306 Q307 Q310 Q308 Q309 12507WR-12L E E E E E 2SA1504S 2SA1504S 2SA1504S 2SA1504S 2SA1504S MODEL OPTION R310 R312 B B B B B 4.7K 4.7K C C C 1 PIN NAME PIN NO. HIGH LOW C C R336 22 P60
