LG RZ-20LZ50 Service Manual
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LG RZ-20LZ50 Service Manual

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See also: Owner's Manual
LCD TV

SERVICE MANUAL

CHASSIS : ML-041B
MODEL : RZ-20LZ50/RT-20LZ50
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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Summary of Contents for LG RZ-20LZ50

  • Page 1: Service Manual

    LCD TV SERVICE MANUAL CHASSIS : ML-041B MODEL : RZ-20LZ50/RT-20LZ50 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 SVC REMOCON ..................12 HOTEL MODE..................13 TROUBLE SHOOTING ................16 BLOCK DIAGRAM...................21 WIRING DIAGRAM ..................25 EXPLODED VIEW .................. 26 REPLACEMENT PARTS LIST ............... 29 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.

  • 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 option : Non-EU, EU) TOP, FLOF,LIST 10 page REMOCON NEC Code PAL/ NTSC AV Input Rear S-Vedio Input Rear Component input Rear (option : NT, Non-EU) PERI TV Connector Full SCART : 1 Rear (option,EU) Ear-phone output RS-232...
  • Page 8 6.Engineering Specification 6-1.General Specification Item Specification Remark Power Supply LED Color H/V Sync Video Power Consumption Normal On/On Active ¡´ 65W GREEN Stand By Off/Off ¡´ 1W Cut-off Switch off PBP SWAP ¢” ON/OFF ITEM Spectification Remark D-SUB Pin Configuraion 1: RED 2: Green 3: Blue:...
  • 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) Japan only 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)

  • Page 10: Adjustment Instruction

    ADJUSTMENT INSTRUCTION 3.2.2 Component Mode Adjustment 1. Application Object (Model: Only RT, RM Model which is possible to input Component signal ) This document is applied to 20" Wide LCD TV which is manufactured in Monitor Factory or is produced on the basis 3.2.2.1 Adjustment preparation of this data.
  • Page 11 *Option(PAL) ITEM CONDITION REMARK ITEM CONDITION REMARK Option 1 Option 3 Side AV No: Side AV Off Language 0:ENGLISH ONLY Yes: Side AV On SCART No: Component input 1:English/German/Frenc Yes: SCART input h / I t a l i a n / S p a n i s h / No: PC Off Dutch/Swedish/Norwegia Yes: PC On...

  • Page 12: 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 13: 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 14 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 15 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.

  • Page 16: 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 17 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 Check inverter Change inverter Connector or inverter connector or inverter Fail Pass Change panel link...
  • Page 18 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 19 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 20 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...

  • Page 21: Block Diagram

    BLOCK DIAGRAM(RZ-20LZ50) - 21 -...
  • Page 22 BLOCK DIAGRAM DESCRIPTION(RZ-20LZ50) 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, SCART), and converts them into an analog RGB signal through the microcomputer (VCTI) combined with the video decoder that integrates various functions in one chip.
  • Page 23 BLOCK DIAGRAM(RT-20LZ50) - 23 -...
  • Page 24 BLOCK DIAGRAM DESCRIPTION(RT-20LZ50) 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.

  • Page 25: Wiring Diagram

    LOCAL KEY IR_LED - 25 -...

  • Page 26: Exploded View

    EXPLODED VIEW - 26 -...
  • Page 27 LCD(LIQUID CRYSTAL DISPLAY), V201V1-T02 VGA CHIMEI TFT COLOR NON 6304FAU017A LCD(LIQUID CRYSTAL DISPLAY), A201SN01-V6 AU TFT COLOR TN 500NITS 16MS 6304FLP171A LCD(LIQUID CRYSTAL DISPLAY), LC201V02-A3K7 LG PHILPS TFT COLOR VGA, 450NIT, 25MS, POL CHANGE 3809TKD006A BACK COVER ASSEMBLY, RZ-20LZ50 3808TKD003A B/C ASSY 3809TKD006H...
  • Page 28 CABINET ASSEMBLY, RZ-20LZ50 BRAND 3090TKD004A 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 3809TKD006J BACK COVER ASSEMBLY, RT-20LZ50 3808TKD003A SKD 3043TKK220A TILT SWIVEL ASSEMBLY, 23LZ50 BASE ASSY SKD...

  • Page 29: Replacement Parts List

    REPLACEMENT PARTS LIST(RZ-20LZ50) 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 30 DATE: 2004. 11. 12. DATE: 2004. 11. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C902 0CH3103K516 10000PF 50V 10% B(Y5P) 2012 C122 0CC100CK41A 10PF 1608 50V 5% R/TP NP0 C955 0CH5390K416 39PF 50V 5% NP0 2012 R/TP...
  • Page 31 DATE: 2004. 11. 12. DATE: 2004. 11. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION ZD201 0DZ510009EE UDZ S 5.1B TP ROHM-K SOD323 L888 0LC0233002A 3.3UH CERATECH R/TP ZD211 0DZ510009EE UDZ S 5.1B TP ROHM-K SOD323 L889...
  • Page 32 DATE: 2004. 11. 12. DATE: 2004. 11. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R999 0RH1000D622 100 1/10W 5 D.R/TP 0RJ2701D677 2.7K OHM 1/10 W 5% 1608 R/TP R136 0RH8202D622 82K 1/10W 5 D.R/TP...
  • Page 33 R2208 0RN2000F409 200 1/6W 1% TA52 C1217 0CH3104K946 100000PF 50V Z F 2012 R/TP SW2200 140-313A TACT 2LEAD 100G(TA) LG C&D N C1218 0CH6331K416 330PF 50V J NP0 2012 R/TP SW2201 140-313A TACT 2LEAD 100G(TA) LG C&D N C1219 0CH6331K416...
  • Page 34 DATE: 2004. 11. 12. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION R1228 0RH0752D622 75 1/10W 5 D.R/TP R1229 0RH0752D622 75 1/10W 5 D.R/TP ZD1210 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 ZD1211 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 ZD1215 0DZ620009HB UDZ S 6.2B TP ROHM SOD323 20 ZD1216 0DZ620009HB...
  • Page 35 REPLACEMENT PARTS LIST(RT-20LZ50) 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 36 DATE: 2004. 11. 18. DATE: 2004. 11. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION C1112 0CK225DFK4A "2.2UF 2012 16V 20%,-20% F(Y5" C122 0CC100CK41A 10PF 1608 50V 5% R/TP NP0 C1113 0CK225DFK4A "2.2UF 2012 16V 20%,-20% F(Y5"...
  • Page 37 DATE: 2004. 11. 18. DATE: 2004. 11. 18. *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION *S *AL LOC. NO. PART NO. DESCRIPTION / SPECIFICATION IC902 0TF492509AA SI4925DY TP TEMIC 30V 6.1A IC905 0IZZTSA003A "ML-041B VGA PAL 20"" CMO ATME" Q1150 0TR322809AB KTC3228-Y(KTC2383) TP KEC TO...
  • Page 38 DATE: 2004. 11. 18. DATE: 2004. 11. 18. *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 0RJ1000D677 100 OHM 1/10 W 5% 1608 R/TP C933 0RH0000D622 0 OHM 1 / 10 W 2012 5.00% D-CMO...
  • Page 39 IR & DAUL BOARD R2207 0RN3301F409 3.30K 1/6W 1% TA52 R2208 0RN2000F409 200 1/6W 1% TA52 SW2200 140-313A TACT 2LEAD 100G(TA) LG C&D N C2101 0CH3104K566 0.1UF 50V 10% X7R 2012 R/TP SW2201 140-313A TACT 2LEAD 100G(TA) LG C&D N L2101 6210TCE001A...
  • Page 40 Date: 2004. 05. 07 P/No.:3854TN1001A...
  • Page 41 Date: 2004. 05. 07 P/No.:3854TN1001A...
  • Page 42 Nov., 2004 P/NO : 3828TSL106G Printed in Korea...

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