LG Electronics 20LS7D(C)-UB manual

LCD TV SER VICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. CHASSIS : LA74E MODEL : 20LS7D(C) 20LS7D(C)-UB website:http://biz.LGservice.com[...]

- 2 - CONTENTS CONTENTS .............................................................................................. 2 PRODUCT SAFETY ..................................................................................3 SPECIFICA TION ........................................................................................6 ADJUSTMENT INSTRUCTION ..[...]

- 3 - SAFETY PRECAUTIONS Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by i n t h e Schematic Diagram and Replacement Parts List. It is essential that these special safety parts should be replaced with the same components as recommended in this manual to prevent Shock, F[...]

- 4 - 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 t[...]

- 5 - 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 techni[...]

- 6 - SPECIFICA TION NOTE : Specifications and others are subject to change without notice for improvement . 4. General Specification(TV) No Item Specification Remark 1 Receiving System ATSC/64 & 256 QAM/ NTSC-M 2 Available Channel 1) VHF : 02~13 2) UHF : 14~69 3) DTV : 02-69 4) CATV : 01~135 5) CADTV : 01~135 3 Input Voltage 100-240V~, 50/60Hz[...]

5. Chroma & Brightness 5.1. FOR 23LC7D (CONDITION : EZ-Picture "Daylight") - 7 - No Item Min Typ Max Unit 1 White peak brightness 360 450 cd/m 260 450 cd/m 2 Contrast ratio 550 700 400 700 Refer to LCD SPEC. 3 Brightness uniformity 1.25 4 Color coordinate RED X Typ -0.03 0.638 Typ +0.03 5 Y Typ -0.03 0.337 Typ +0.03 6 GREEN X Typ -0.0[...]

- 8 - 5.1. FOR 20LC7D (CONDITION : EZ-Picture "Daylight") 6. Component Video Input (Y, CB/PB, CR/PR) No Resolution H-freq(kHz) V-freq(Hz) Pixel clock Proposed 1. 720*480 15.73 59.94 SDTV ,DVD 480I 2. 720*480 15.73 60.00 SDTV ,DVD 480I 3. 720*480 31.47 59.94 SDTV 480P 4. 720*480 31.50 60.00 SDTV 480P 5. 1280*720 44.96 59.94 HDTV 720P 6. 12[...]

No. Item Content Remark 1 Product Dimension Width(W) Length(D) Height(H) Before Packing 499.6 175.0 401.4 Head depth : 73.0mm After Packing 563.0 173.0 423.0 (stand detachable, 3 piece type) 2 Product Weight Only SET 6.22 Kg With Box 7.73 Kg 3 Container Loading Quantity Individual or Palletizing 20 ft 40 ft 40 ft_HC Indi. Wooden Indi. Wooden Indi. [...]

- 10 - ADJUSTMENT INSTRUCTION 1. Application Object These instructions are applied to all of the LCD TV, LA74E. 2. Notes (1) Because this is not a hot chassis, it is not necessary to use an isolation transformer. However, the use of isolation transformer will help protect test equipment. (2) Adjustments must be done in the correct order. (3) The ad[...]

- 11 - 3-4. Set Method (1) MCU Select: MTV512M64 (2) Option R/W Option: Auto Write(Verity) Jig Option: Myson Transmit Speed: Medium (3) Check: Just do it with blank micom. (4) PORT Chose Parallel Port (normal LPT1) Attention:You must chose EPP when select Rom BIAS at LPT 3-5. Download Method (1) Click the Load File. (2) Locate and select the correc[...]

5 . EDID (The Extended Display Identification Data) / DDC (Display Data Channel) Download This is the function that enables “Plug and Play". 5-1. HDMI EDID Data Input (1) Required Test Equipment 1) PC, Jig for adjusting DDC. (PC serial to D-sub Connection equipment) 2) S/W for writing DDC(EDID data write & read) 3) D-Sub cable (2) Prepar[...]

- 13 - 7. Adjustment of White Balance 7-1. Required Equipment (1) Color analyzer (CA-100 or CA210 similar product) (2) Automatic adjustor (with automatic adjustment necessity and the RS-232C communication being possible) 7-2. Connection Diagram of Equipment for Measuring (Automatic Adjustment) * RS-232C Command (Automatic Adjustment) 7-3. Adjustmen[...]

- 14 - 1. TV/CA TV doesn't display Check TU4002 Pin9(Video output) Can you see the normal signal? Could you measure voltage of TU4002 & IIC lines? Are they all normal? You should replace TUNER. You should check power line & IIC lines. Check the input(Pin63) of AV switch(IC5003). Can you see the normal waveform? After checking the Power[...]

- 15 - 2. Video doesn't display Check J5007 Pin2 Can you see the normal waveform? J5007 may have problem. Replace this Jack. Check the input(Pin1) of AV switch (IC5003). Pin1 is for video1,Pin8 is for video 2. Can you see the normal waveform? After checking the Power of AV switch you should decide to replace AV switch or not. Yes No No No No N[...]

- 16 - 3. Component doesn't display Check J5004 Can you see the normal waveform? J5004 may have problem. Replace this Jack. Check the input of Component switch(IC5001). Can you see the normal waveform? After checking the input TR of component, you should decide to replace component switch or not. No No No No No Yes Yes Yes Yes Yes Check the ou[...]

- 17 - 4. RGB_PC doesn't display Check input connect P7004. Can you see the normal waveform? P7004 may have problem. Replace this Jack. Check the input of Component switch(IC5001). Can you see the normal waveform? After checking the input TR of RGBHV, you should decide to replace these components or not. No No No No No Yes Yes Yes Yes Yes Chec[...]

- 18 - 5. HDMI doesn't display Check input connect J7101. Can you see the normal waveform? J7101 may have problem. Replace this Jack. Check DDC communication lines(IC702 Pin5,6) After checking the Power of this chip, you should decide to replace this or not. No No No No No Yes Yes Yes Yes Yes Check HDCP communication lines(IC701 Pin5,6) After [...]

BLOCK DIAGRAM - 19 - CX A 2069Q (IC5003) LCD Mo d u l e SVHS BCM 3550K P B5G (IC1001) M S T3382M (IC7004) EEPROM CV BS LCDS TV Tuner AT_ TU_V MM1 73 1 XV BE (IC5001) RG B Y PB PR COM_ Y PB PR Y CB CR RG B _L R AUO _ LR COM_ LR FMS64 00 S (IC4006) M_Y C MAIN Y MAIN_ C SP ( R) SP ( L ) SP_L SP_R P7 00 9 P7 01 0 Ea r p h o n e M C33078DR (IC7002) C553[...]

- 20 - EXPLODED VIEW 300 200 580 520 521 530 531 400 431 430 440 450 120 590[...]

- 21 - EXPLODED VIEW P ARTS LIST No. PART NO. DESCRIPTION EAB35995501 Speaker,Full Range A11 EN1227C-6710 3W 8OHM 80DB 300HZ 31 X 78.5 X 21 LUG KOREA 6304FAU027A LCD,Module-TFT T200XW02-V0 T200XW02-V0 AU TFT COLOR TN,450NITS,600 BY 1,8MS ABJ32724402 Cabinet Assembly 20ls7d la74e 20” cabinet assy dtv-us_CSKD ACQ32625702 Cover Assembly 20LS7D LA74E[...]

- 22 - C1001 0CE107WF6DC MVK6.3TP16VC100M 100uF 20% 16V 80MA -40TO+ C1007 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C1008 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1009 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C1010 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C101 1 0CK104BF56A C1005X7R104KET 100[...]

- 23 - C2603 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C2604 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C2605 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C2606 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C2607 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C3005 0CK475CC94A C1608Y5V0J475ZT[...]

- 24 - C4044 0CE107WF6DC MVK6.3TP16VC100M 100uF 20% 16V 80MA -40TO+ C4046 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C4047 0CE107WF6DC MVK6.3TP16VC100M 100uF 20% 16V 80MA -40TO+ C4047 EAE30840201 4SVPC330M 330uF 20% 4V 2.32A -55TO+105C SV C4048 0CK104BF56A C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C4056 0CK104BF56A C1005X7R104KET 100nF[...]

- 25 - C6001 0CK105CD56A C1608X7R1A105KT 1uF 10% 10V X7R -55TO+125C C6002 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C6003 0CK103BH56A C1005X7R1E103KT - 10nF 10% 25V X7R -55TO+12 C6004 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V C0G -55TO+125 C6004 0CC101CK41A C1608C0G1H101JT 100pF 5% 50V C0G -55TO+125 C6005 0CE107WF6DC MVK6.3TP16VC100M 1[...]

- 26 - D4005 0DD184009AA KDS184 KDS184 TP KEC - 85V - - - 300MA KEC D4005 0DD184009AA KDS184 KDS184 TP KEC - 85V - - - 300MA KEC D4007 0DR340009AA MBRS340 525MV 40V 4A 0SEC 0F 0W DO214 R/TP D4008 0DS226009AA KDS226 1.2V 85V 300MA 2A 4NSEC 150MW SOT23 D5001 0DD184009AA KDS184 KDS184 TP KEC - 85V - - - 300MA KEC D5001 0DD184009AA KDS184 KDS184 TP KEC[...]

- 27 - AR2017 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP AR2200 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4P 8P AR2201 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4P 8P AR2202 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4P 8P AR2203 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4P 8P AR2204 EBC32260405 MNR04M0APJ680 68OHM 5% 1/16W 4P 8P AR2205 EBC3[...]

- 28 - R1 185 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R/TP RO R1234 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R1235 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R1236 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R2000 0RJ0222C692 MNR04 M0APJ 220 22OHM 5% 1/16W 1005X4 R/TP R2002 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/[...]

- 29 - R3203 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R4000 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R4000 0RN6801F409 RN-96T1F6K80 6.8KOHM 1% 1/6W 3.2X1.8MM NON R4001 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R4001 0RN2201F409 RN-96T1F2K20 2.2KOHM 1% 1/6W 3.2X1.8MM NON R4002 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/[...]

- 30 - R4147 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R4147 0RJ1001C678 MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R4148 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R4155 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R4158 0RJ6801D677 MCR03EZPJ682 6.8KOHM 5% 1/10W 1608 R/TP R R4158 0RJ6801D677 MCR03EZPJ682 6.8KOHM 5% 1[...]

- 31 - R6031 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R6032 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R6033 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R6034 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R6034 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R6035 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/1[...]

- 32 - R7300 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 R/TP ROH R7301 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W 1608 R/TP ROH R7302 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 R/TP ROH R7303 0RJ3900D677 MCR03EZPJ391 390OHM 5% 1/10W 1608 R/TP RO R7304 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W 1608 R/TP ROH R7305 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/1[...]

- 33 - SW4002 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF SW4003 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF SW4004 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF SW4005 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF SW4006 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 160GF SW4007 140-058B EVQPB205K 1C1P 15VDC 0.02A VERTICAL 1[...]

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Mar., 2007 Printed in Korea P/NO : MFL37186102[...]