Related Manuals for LG RT-20LA90
Summary of Contents for LG RT-20LA90
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Page 1: Service Manual
LCD TV SERVICE MANUAL CHASSIS : ML-041B MODEL : RZ-20LA90/RT-20LA90 CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. -
Page 2: Table Of Contents
CONTENTS CONTENTS ....................2 PRODUCT SAFETY ..................3 SPECIFICATION ..................6 ADJUSTMENT INSTRUCTION ...............10 HOTEL MODE..................12 TROUBLE SHOOTING ................15 BLOCK DIAGRAM...................20 WIRING DIAGRAM ..................22 EXPLODED VIEW .................. 23 EXPLODED VIEW PARTS LIST ..............24 REPLACEMENT PARTS LIST ............... 26 SVC. SHEET ....................- 2 -... -
Page 3: Product Safety
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 X-RADIATION, Shock, Fire, or other Hazards. -
Page 4: Servicing Precautions
SERVICING PRECAUTIONS CAUTION: Before servicing receivers covered by this service unit under test. manual and its supplements and addenda, read and follow the 2. After removing an electrical assembly equipped with ES SAFETY PRECAUTIONS on page 3 of this publication. devices, place the assembly on a conductive surface such as NOTE: If unforeseen circumstances create conflict between the aluminum foil, to prevent electrostatic charge buildup or... - Page 5 IC Remove/Replacement Some chassis circuit boards have slotted holes (oblong) through Circuit Board Foil Repair which the IC leads are inserted and then bent flat against the Excessive heat applied to the copper foil of any printed circuit circuit foil. When holes are the slotted type, the following technique board will weaken the adhesive that bonds the foil to the circuit should be used to remove and replace the IC.
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Page 6: Specification
SPECIFICATION NOTE : Specifications and others are subject to change without notice for improvement. 1. Application range This specification is applied to ML-041B chassis. 2. Requirement for Test Testing for standard of each part must be followed in below condition. (1) Temperature: 25°C ±... - Page 7 4. Feature and Function Item Specification Remark Teletext Top(option) TOP, FLOF REMOCON NEC Code PAL/ NTSC CVBS VIDEO Input Rear S-VIDEO Input Rear Component input Rear (option:NTSC, Non-EU) PERI TV Connector Full SCART : 1 Rear (option:EU) H/p input RS-232 Only Commercial Model Discrete IR Only Commercial Model...
- Page 8 6.Engineering Specification Item Specification Remark Power Supply LED Color H/V Sync Video Power Consumption Normal ≤ 65W GREEN On/On Active Suspend Mode Off/Off ≤ 1W Cut-off Switch off PBP SWAP ▶ ON/OFF ITEM Spectification Remark D-SUB Pin Configuraion 1: RED 2: Green 3: Blue 4: ID2(GND)
- Page 9 6-2.Power Item Unit Remark AC Power Shut Down Voltage DC Voltage, Inverter 11.4 11.4 DC Voltage, LCD Panel 11.4 12.6 DC Voltage, Audio 14.0 16.0 DC Voltage, Tuner(5) DC Voltage, Tuning(33) DC Voltage, VCTi(5) DC Voltage, VCTi(8) DC Voltage, VCTi(3.3) DC Voltage, VCTi(1.8) DC Voltage, GM2221 (3.3) DC Voltage, GM2221 (1.8)
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Page 10: Adjustment Instruction
ADJUSTMENT INSTRUCTION (Only RT-20LA90) 1. Application Object 2.2.1 Component Mode adjustment 2.2.1.1 Adjustment preparation This instruction is for the application to the LCD TV. ■Execution of RF no signal during Heat Run over 2. Adjustment 30min... ■The component jack(Y, Pb, Pr) of LCD TV is 2.1 Adjustment Details... -
Page 11: Svc Remocon
SVC REMOCON FUNTION REAMARK To turn the TV on or off POWER To turn the TV on automatically if the power is supplied to the TV. (Use the POWER ON POWER key to deactivate): It should be deactivated when delivered. To activate the mute function. -
Page 12: Hotel Mode
1.1. Channel Menu Display - Decide to enter 'Channel Menu' or not in the 'Main Menu' by setting 'Channel Menu Display' as Yes(Enter Possible) or No(Enter Impossible) on the "LG Hotel Mode" OSD. 1.2. Channel Change - Decide to change channel or not by setting 'Channel Change' as Yes(Change Possible) or No(Change Impossible) when present source is TV. - Page 13 1.3. Input Source Change - Decide to change input source or not by setting 'Input Source Change' as Yes(Change possible) or No(Change impossible). - When 'Input Source Change' is set to No(Change impossible), TV/AV key and Multimedia key doesn't work, and entering 'Input' item in the 'Main Menu OSD' is impossible.
- Page 14 1.10. Channel - Decide to turn on TV as set channel or last memorized channel or not by setting 'Channel' as On(Work) or Off(Do Not Work). - When 'On Monitor Operation' is set to Yes(Work), then user can enter 'Channel' and set the value. - When 'On Monitor Operation' is set to On(Work), setting 'Channel' value of ''On Monitor Operation' is possible and TV always turns on as set 'Channel' value.
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Page 15: Troubleshooting
TROUBLESHOOTING No power :[A]Process (LED indicator off) Check short of main B/D Check 15V or 5V or Change Lips Fail of Lips Pass Check Output of Change Q1100 Fail Q1100 Pass Check Output of Change IC1107, IC1104 IC1107, IC104 Fail Pass Change LED Assy Check LED Assy... - Page 16 No Raster :[B]Process Check LED Status Repeat A PROCESS on display unit Fail Check L900,L901 Change L900,L901, L902,L903 L902,L903 Fail Pass Check the input/ Change IC901 Output of IC901 Fail Pass Change inverter Check inverter connector or inverter Connector or inverter Fail Pass Change panel link...
- Page 17 No Raster on Component signal Repeat [A] Process Pass Check the signal of Check JA1200 or L1200, L1202, L1203 RCA CABLE Fail Pass Re-soldering or Check the input/ Change the defect part, Fail output of IC1 Check X11 Re-soldering or Check the input/output Change the defect part Fail...
- Page 18 No Raster on AV Signal No Raster on TV(RF) signal (Video, S-Video) Check 5V, 33V of TU1000 Repeat Check the output of Re-soldering or [A] Process TU1000 Fail Fail Change the defect part Pass Check the signal of Change L1209, L1210, L1209, L1210, L1212 L1212 Fail...
- Page 19 No Sound Check the Change source input input source Fail Pass Re-soldering or Check the input/output Change the defect part of IC1 Fail Check X11 Pass Re-soldering or Check the input/output Change the defect part of IC100,IC101 Fail Pass Check the speaker Change speaker Fail Pass...
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Page 20: Block Diagram
BLOCK DIAGRAM - 20 -... - Page 21 BLOCK DIAGRAM DESCRIPTION 1. Video Controller Unit & Display Data Conversion Unit The video controller unit receives the video signals inputted through the tuner, AV port (AV1, AV2, S-Video, component), and converts them into an analog RGB signal through the microcomputer (VCTI) combined with the video decoder that integrates various functions in one chip.
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Page 22: Wiring Diagram
LOCAL KEY IR_LED - 22 -... -
Page 23: Exploded View
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Page 24: Exploded View Parts List
CABINET ASSEMBLY, RZ/RT-20LA90 BRAND 3091TKL116A C/SKD 6306V20002A LCD(LIQUID CRYSTAL DISPLAY), V201V1-T02 VGA CHIMEI TFT COLOR NON 6304FLP171A LCD(LIQUID CRYSTAL DISPLAY), LC201V02-A3K7 LG PHILPS TFT COLOR VGA, 450NIT, 25MS, POL CHANGE 3809TKD002M BACK COVER ASSEMBLY, RZ-20LA70 3808V00427 ML041B(SCART) 3809TKD002R BACK COVER ASSEMBLY, RM-20LA70 3808V00427 FOR RUSSIA (ML041B) -
Page 25: Exploded View Parts List
6304FLP171A LCD(LIQUID CRYSTAL DISPLAY), LC201V02-A3K7 LG PHILPS TFT COLOR VGA, 450NIT, 25MS, POL CHANGE or 6304FLP188A LCD(LIQUID CRYSTAL DISPLAY), LC201V02-A3KA LG PHILPS TFT COLOR PB FREE MODULE , SS D-IC 3809TKD009C BACK COVER ASSEMBLY, RZ-20LA70 3808V00427 ML041B, PHANTOM OF 3809TKD002U... -
Page 26: Replacement Parts List
REPLACEMENT PARTS LIST(RZ-20LA90) For Capacitor & Resistors, the CC, CX, CK, CN, CH : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit in the CQ : Polyestor RS : Metal Oxide Film P/No. means as follows; CE : Electrolytic RN : Metal Film CF : Fixed Film RH : CHIP, Metal Glazed(Chip) - Page 27 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C955 0CH5390K416 39PF 50V 5% NP0 2012 R/TP 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 C1001 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y...
- Page 28 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION FET & TRANSISTOR ZD211 0DZ510009EE UDZ S 5.1B TP ROHM-K SOD323 D1151 0DZ330009DF MTZJ33B TP ROHM-K DO34 0.5W IC1107 0TF492509AA SI4925DY TP TEMIC 30V 6.1A...
- Page 29 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C932 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D 0RJ0000D677 0 OHM 1/10 W 5% 1608 R/TP C933 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D...
- Page 30 75 1/10W 5 D.R/TP R2208 0RN2000F409 200 1/6W 1% TA52 R1232 0RH5101D622 5.1K 1/10W 5 D.R/TP SW2200 140-313B TACT 2LEAD 160G(TA) LG C&D N R1233 0RH4703D622 470K 1/10W 5 D.R/TP SW2201 140-313B TACT 2LEAD 160G(TA) LG C&D N R1234 0RH5101D622 5.1K 1/10W 5 D.R/TP...
- Page 31 DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1203 0RH0752D622 75 1/10W 5 D.R/TP R1204 0RH0752D622 75 1/10W 5 D.R/TP R1207 0RH0752D622 75 1/10W 5 D.R/TP R1210 0RH0752D622 75 1/10W 5 D.R/TP R1212 0RH0752D622 75 1/10W 5 D.R/TP R1214 0RH0752D622 75 1/10W 5 D.R/TP...
- Page 32 REPLACEMENT PARTS LIST(RT-20LA90) For Capacitor & Resistors, the CC, CX, CK, CN, CH : Ceramic RD : Carbon Film charactors at 2nd and 3rd digit in the CQ : Polyestor RS : Metal Oxide Film P/No. means as follows; CE : Electrolytic...
- Page 33 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C955 0CH5390K416 39PF 50V 5% NP0 2012 R/TP 0CC102CK41A 1000PF 1608 50V 5% R/TP NP0 C1001 0CK103CK51A 0.01UF 1608 50V 10% R/TP B(Y...
- Page 34 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION 0IKE702700D "KIA7027AF 3, SOT-89 TP RESET" Q100 0TR387500AA CHIP 2SC3875S(ALY) BK KEC - 0IMCRAL006A AT24C16AN-10SI-2.7 ATMEL 8P Q1000 0TR388109AA...
- Page 35 DATE: 2004. 11. 25. DATE: 2004. 11. 25. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1154 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D 0RJ1500D677 150 OHM 1/10 W 5% 1608 R/TP R1155 0RH1002D622 10K OHM 1 / 10 W 2012 5.00%...
- Page 36 0RN2000F409 200 1/6W 1% TA52 ZD1207 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 SW2200 140-313B TACT 2LEAD 160G(TA) LG C&D N ZD1212 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 SW2201 140-313B TACT 2LEAD 160G(TA) LG C&D N ZD1213 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20...
- Page 37 Date: 2004. 05. 07 P/No.:3854TN1001A...
- Page 38 Date: 2004. 05. 07 P/No.:3854TN1001A...
- Page 39 NOV, 2004 P/NO : 3828TSL108Q Printed in Korea...