website:http://biz.LGservice.com LCD TV SERVICE MANUAL CHASSIS : LA74E MODEL : 20LS7D(C) 20LS7D(C)-UB CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CONTENTS CONTENTS .............................................................................................. 2 PRODUCT SAFETY ..................................................................................3 SPECIFICATION ........................................................................................6 ADJUSTMENT INSTRUCTION ...............................................................10 TROUBLE SHOOTING ............................................................................
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 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, 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 3. Test method 1) This spec sheet is applied all of the 20/23" LCD TV with LA74E chassis.
5. Chroma & Brightness 5.1. FOR 23LC7D (CONDITION : EZ-Picture "Daylight") No 1 2 Item Min White peak brightness 360 450 cd/m 260 450 cd/m 550 700 400 700 Typ -0.03 0.638 Typ +0.03 Contrast ratio 3 Brightness uniformity 4 Color coordinate 1.25 Y Typ -0.03 0.337 Typ +0.03 GREEN X Typ -0.03 0.299 Typ +0.03 Y Typ -0.03 0.604 Typ +0.
5.1. FOR 20LC7D (CONDITION : EZ-Picture "Daylight") No 1. 2. Item White peak brightness Contrast Ratio 3. Brightness uniformity 4. Color coordinate BLUE WHITE White Balance Target Typ Cool Medium Warm 360 450 cd/m 250 450 cd/m2 600 700 400 700 Viewing angle 7. Color Temperature Unit Remark 2 PSM : Daylight PSM : Daylight Refer to LCD SPEC. X 0.640 +/- 0.03 Y 0.330 +/- 0.03 X 0.290 +/- 0.03 Y 0.600 +/- 0.03 X 0.150 +/- 0.03 Y 0.060 +/- 0.03 X 0.295 +/- 0.
7. RGB input (PC/DTV) No Resolution H-freq(kHz) V-freq.(Hz) Pixel clock(MHz) Proposed PC 1 640*350 31.469 70.08 25.17 DOS O 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 59.87 79.50 VESA(WXGA) O 7 1360*768 47.712 60.01 85.50 VESA(WXGA) O 8 1366*768 60.023 60.00 80.00 8. Mechanical specification <20LC7D> No.
ADJUSTMENT INSTRUCTION 3-2. JIG Connection 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 adjustments must be performed in the circumstance of 20±5°C of temperature and 65±10% of relative humidity if there is no specific designation.
3-4. Set Method 4. ADC-Set Adjustment (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 4-1. Synopsis ADC-Set adjustment to set the black level and the Gain to optimum. 4-2.
(3) 23LS7D-UB : HDMI 5. EDID (The Extended Display Identification Data) / DDC (Display Data Channel) Download EDID Block 0, Byte 0 - 127 [00H-7FH] Block Type : EDID 1.3 0 This is the function that enables “Plug and Play". 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 FF FF FF FF FF FF 00 1E 6D 01 00 01 01 01 01 10 00 10 01 03 80 33 1D 96 0A CF 74 A3 57 4C B0 23 5-1.
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) Full White Pattern COLOR ANALYZER TYPE; CA-210+
TROUBLESHOOTING 1. TV/CATV doesn't display Check TU4002 Pin9(Video output) Can you see the normal signal? No Could you measure voltage of TU4002 & IIC lines? Are they all normal? No You should check power line & IIC lines. Yes Yes Check the input(Pin63) of AV switch(IC5003). Can you see the normal waveform? You should replace TUNER. No After checking the Power of AV switch you should decide to replace AV switch or not.
2. Video doesn't display Check J5007 Pin2 Can you see the normal waveform? No J5007 may have problem. Replace this Jack. Yes Check the input(Pin1) of AV switch (IC5003). Pin1 is for video1,Pin8 is for video 2. Can you see the normal waveform? No After checking the Power of AV switch you should decide to replace AV switch or not. No After checking the Power of AV switch you should decide to replace AV switch or not. No After checking the Power of LPF you should decide to replace LPF or not.
3. Component doesn't display Check J5004 Can you see the normal waveform? No J5004 may have problem. Replace this Jack. Yes Check the input of Component switch(IC5001). Can you see the normal waveform? No After checking the input TR of component, you should decide to replace component switch or not. No After checking the Power of component switch you should decide to replace component switch or not. No After checking the Power of MST3382M you should decide to replace MST3382M or not.
4. RGB_PC doesn't display Check input connect P7004. Can you see the normal waveform? No P7004 may have problem. Replace this Jack. Yes Check the input of Component switch(IC5001). Can you see the normal waveform? No After checking the input TR of RGBHV, you should decide to replace these components or not. No After checking the Power of RGB switch you should decide to replace component switch or not. No After checking the Power of MST3382M you should decide to replace MST3382M or not.
5. HDMI doesn't display Check input connect J7101. Can you see the normal waveform? No J7101 may have problem. Replace this Jack. Yes Check DDC communication lines(IC702 Pin5,6) No After checking the Power of this chip, you should decide to replace this or not. No After checking the Power of this chip, you should decide to replace this or not. No After checking the trace of TMDS lines and power of MST3382M, you should decide to replace MST3382M or not.
- 19 - USB SVHS CXA2069Q ( IC5003) 9V AT_TU_V EEPROM EEPROM RGB Y PB PR 5V ( IC3001) TPS2052B MST3382M ( IC7004) 9V FMS6400S ( IC4006) EEPROM Y CB CR I2C_2 EEPROM AT24C512 5V I2C_0 BCM3550KPB5G ( IC1001) A1. 2V_BCM A2. 6V_BCM D2. 6V_BCM 3. 3V A3. 3V_BCM M_CLK 3. 3V MTV416GMF ( IC4015) KEY1 2. 6V_BCM KIA7029 LRD_R LRD_G IR KEY2 P4007 3.
300 590 120 200 580 520 521 531 530 - 20 430 431 440 400 450 EXPLODED VIEW
EXPLODED VIEW PARTS LIST No. PART NO. DESCRIPTION 120 EAB35995501 Speaker,Full Range A11 EN1227C-6710 3W 8OHM 80DB 300HZ 31 X 78.
REPLACEMENT PARTS LIST DATE: 2007. 03. 10. LOC. NO. PART NO. DESCRIPTION / SPECIFICATION CAPACITORs C1001 0CE107WF6DC MVK6.
LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO.
LOC. NO. PART NO. C4044 0CE107WF6DC C4046 0CK104BF56A C4047 0CE107WF6DC C4047 DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION MVK6.3TP16VC100M 100uF 20% 16V 80MA -40TO+ C5002 0CK103CK56A 0603B103K500CT 10nF 10% 50V X7R -55TO+125C C1005X7R104KET 100nF 10% 16V X7R -55TO+125 C5003 0CH3104K566 0805B104K500CT 100nF 10% 50V X7R -55TO+125 MVK6.
LOC. NO. PART NO. C6001 0CK105CD56A C6002 0CK103BH56A C6003 0CK103BH56A C6004 C6004 DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1608X7R1A105KT 1uF 10% 10V X7R -55TO+125C C7170 0CE227WF6DC C1005X7R1E103KT- 10nF 10% 25V X7R -55TO+12 C7170 EAE30840201 4SVPC330M 330uF 20% 4V 2.
LOC. NO. PART NO. D4005 0DD184009AA D4005 0DD184009AA D4007 D4008 DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION KDS184 KDS184 TP KEC - 85V - - - 300MA KEC IC6001 0IPMG00063A MP1593DN-LF-Z 4.75TO28V 1.2V - SOIC R/TP 8 KDS184 KDS184 TP KEC - 85V - - - 300MA KEC IC6004 0ITH638300C THC63LVDM83R 3VTO3.6V 500MW TSSOP R/TP 56P 0DR340009AA MBRS340 525MV 40V 4A 0SEC 0F 0W DO214 R/TP IC7001 0ICB533100A CS5331A-KSZR 4.75TO5.25V 48KHZ 18BIT 0SPS 0DS226009AA KDS226 1.
LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO.
LOC. NO. PART NO. DESCRIPTION / SPECIFICATION LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1185 0RJ1000D677 MCR03EZPJ101 100OHM 5% 1/10W 1608 R/TP RO R3020 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R1234 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R3023 0RJ0000C678 MCR01MZPJ000 0OHM 5% 1/16W 1005 R/TP ROHM R1235 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R3025 0RJ4701C678 MCR01MZPJ472 4.
LOC. NO. PART NO. R3203 0RJ0222C678 R4000 0RJ1001C678 R4000 DESCRIPTION / SPECIFICATION LOC. NO. PART NO. MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R R4080 0RJ4701C678 MCR01MZPJ472 4.7KOHM 5% 1/16W 1005 R/TP R MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R4082 0RJ0222C678 MCR01MZPJ220 22OHM 5% 1/16W 1005 R/TP - R 0RN6801F409 RN-96T1F6K80 6.8KOHM 1% 1/6W 3.2X1.
LOC. NO. PART NO. R4147 0RJ1001C678 R4147 0RJ1001C678 R4148 DESCRIPTION / SPECIFICATION LOC. NO. PART NO. MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R5048 0RJ0822C678 MCR01MZPJ820 82OHM 5% 1/16W 1005 R/TP ROH MCR01MZPJ102 1KOHM 5% 1/16W 1005 R/TP ROH R5049 0RJ1502D677 MCR03EZPJ153 15KOHM 5% 1/10W 1608 R/TP RO 0RJ1000C678 MCR01MZPJ101 100OHM 5% 1/16W 1005 R/TP RO R5050 0RJ6801D677 MCR03EZPJ682 6.
LOC. NO. PART NO. R6031 0RJ0222C678 R6032 0RJ0222C678 R6033 DESCRIPTION / SPECIFICATION LOC. NO. PART NO.
LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R7300 0RJ0332C678 MCR01MZPJ330 33OHM 5% 1/16W 1005 R/TP ROH L6003 EAP32842805 R7301 0RJ0682D677 MCR03EZPJ680 68OHM 5% 1/10W 1608 R/TP ROH L7008 0LCML00020B Inductor,Multilayer,Chip MLI-201209-6R8K 6.
LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 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 160GF LOC. NO.
P/NO : MFL37186102 Mar.
