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LG RT-21FB200PX Service Manual

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COLOR TV
SERVICE MANUAL
CHASSIS : MC-019B
MODEL : RT-21FB200PX
MODEL :
RT-21FB220PX
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 RT-21FB200PX

  • Page 1 COLOR TV SERVICE MANUAL CHASSIS : MC-019B MODEL : RT-21FB200PX MODEL : RT-21FB220PX CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.

  • Page 2: Table Of Contents

    CONTENTS Contents ......................... 2 Safety Precautions ....................3 Servicing Precautions ..................4 Specifications ..................... 6 Description of Controls .................. 7 Disassembly Instructions ................10 Adjustment ......................11 Purity & Convergence Adjustment ............14 Block Diagram ......................17 T rouble Shooting ....................18 Exploded View ....................22 Exploded View Parts List ................23 Replacement Parts List ................

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS IMPORT ANT SAFETY NOTICE Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by 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 transistors and semicounductor "chip" components. The manual and its supplements and addenda, read and follow the following techniques should be used to help reduce the SAFETY PRECAUTIONS on page 3 of this publication. incidence of component damage caused by static by static NOTE: If unforeseen circumstances create conflict between the electricity.
  • Page 5 c. Qulckly move the soldering iron tip to the junction of the Fuse and Conventional Resistor component lead and the printed circuit foil, and hold it Removal/Replacement there only until the solder flows onto and around both the 1. Clip each fuse or resistor lead at top of the circuit board component lead and the foil.

  • Page 6: Specifications

    SPECIFICATIONS Note : Specification and others are subject to change without notice for improvement. Video input system: PAL-B/G, D/K, I/I SOUND IF : 33.4MHz (B/G) SECAM-B/G, D/K 32.9MHz (I/I) NTSC M 32.4MHz (D/K) NTSC 4.43 34.4MHz (M) Intermediate Frequency (Unit : MHz) Power requirement : 110~240V, 50/60Hz VISION IF : 38.9MHz COLOR IF : 34.47MHz(4.43)

  • Page 7: Description Of Controls

    PLAY (Volume Up/Down) adjusts the volume. adjusts menu settings. P/STILL STOP 7. VCR BUTTONS control a LG video cassette recorder. LIST 8. SSM (Sound Status Memory) recalls your preferred sound setting. I/II/ 9. PSM (Picture Status Memory) EYE/ TEXT/ PIP/ recalls your preferred picture setting.
  • Page 8 13. MUTE switches the sound on or off. 14. TV/AV selects TV or AV mode. clears the menu from the screen. switches the set on from standby. 15. MENU selects a menu. selects an index page in the teletext mode (only TELETEXT models).
  • Page 9 RF/RT-21FA34 series RF/RT-21FB2 series MENU ON/OFF MENU OK ON/OFF 9 10 1 2 3 CF/CT-21Q64N/65N/66N series CF/CT-21Q20N/21N/22N series TV/AV VIDEO AUDIO ON/OFF TV/AV VIDEO AUDIO ON/OFF 1 2 3 6 7 9 10 10 9 6 7 8 CF/CT-21Q60N/61N/62N series CF/CT-15Q90N/91N/92N series TV/AV ON/OFF...

  • Page 10: Disassembly Instructions

    DISASSEMBLY INSTRUCTIONS Important note Chassis Assy Removal This set is disconnected from the power supply through the Grasp both side of Frame and pull it backward smoothly. converter transformer. An isolating transformer is necessary for service operations on the primary side of the converter transformer.

  • Page 11: Adjustment

    ADJUSTMENT Safety Precautions Option Code Function Remark 1. It is safe to adjust after using insulating transformer W/O TBS between the power supply line and chassis input to WITH TBS prevent the risk of electric shock and protect the instrument. W/O EYE 2.
  • Page 12 Table below. 5) Press the OK( ) button to memorize the data. Status Initial Data Remark 6700VPF009G Tuner P/N 6700VPF016A LG Innotek(W/S TUNER) Marker DAEWOO(W/S TUNER) 2.7! 0.05V 2.7! 0.05V AGC Voltage 6700VPF009S Tuner P/N BLO-R...
  • Page 13 2. Deflection Initial Setup Data Status Default 21" FLAT S/S 21" FLAT LG 3. Deflection Adjustment Procedure VL (Vertical Linearity) Adjust so that the boundary line between upper and lower half is in accord with geometric horizontal center of the CPT.

  • Page 14: Purity & Convergence Adjustment

    PURITY & CONVERGENCE ADJUSTMENT Caution: 5. Reconnect the internal degaussing coil. Convergence and Purity have been factory aligned. Do not attempt to tamper with these alignments. 6. Position the beam bender locking rings at the 9 o'clock However, the effects of adjacent receiver components, or position and the other three pairs of tabs (2,4 and 6 pole replacement of picture tube or deflection yoke may require the magnets) at the 12 o'clock position.
  • Page 15 1.ADJUST YOKE Z-AXIS FIRST 2 .ADJUST BEAM BENDER 2 POLE TO GET EQUAL BLUE MAGNET TO GET FOUR EQUAL COLOR CIRCLES COLOR CIRCLES MAGNETS 8. Referring to above, perform the following two steps: 6. Reconnect the internal degaussing coil and apply AC power. a.
  • Page 16 ROTATION DIRECTION RING MOVEMENT OF RED OF BOTH TABS PAIRS AND BLUE BEAMS OPPOSITE POLE SAME OPPOSITE POLE SAME UP/DOWN ROCKING OF THE YOKE LEFT/RIGHT ROCKING OF THE YOKE UP/DOWN ROCKING OF THE YOKE LEET/RIGHT ROCKING OF THE YOKE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF THE CAUSES OPPOSITE ROTATION OF RED CAUSES OPPOSITE SIZE CHANGE OF...

  • Page 17: Block Diagram

    BLOCK DIAGRAM EXT.RGB - 17 -...

  • Page 18: Trouble Shooting

    TROUBLE SHOOTING NO RASTER CHECK +B at D807 cathode Normal Abnormal Open Check Is the voltage at pin61,56 FUSE of AC line & 54 of IC01 3.3V? Check /replace Fuse,DB801 Is the voltage at pin14 Check the voltage Is the voltage at pin3 &...
  • Page 19 NO SOUND / PICTURE OK MONO Select correct system in menu Check the waveform Check the waveform Check the waveform at pin 44 of IC01 at pin 35 of IC501 at pin 4 of IC651 Check the waveform Check the waveform Check/Replace Q621 at pin 1 of IC601 at pin 2,7 of IC651...
  • Page 20 AV STEREO Select correct system in menu Check the waveform Check / Replace at pin 44 of IC01 IC01 Check the waveform Check the voltage at pin 15,18 of IC631 at pin 6 of IC631 Check the waveform Check/Replace at pin 4,12 of IC602 IC602 Check/Replace Check the voltage...
  • Page 21 NO PICTURE / NO SONUD Is any OSD displayed? Check IC01 pin50,51,52,53 Check receiving system in MENU (IK,R,G,B) & excute Auto-program. Does the Auto-program Check/ Replace operate properly. IC01 Store in manual-program MENU Check Check 5V, 33V & IIC Bus Line 5V, 33V &...

  • Page 22: Exploded View

    EXPLODED VIEW - 22 -...

  • Page 23: Exploded View Parts List

    COIL,DEGAUSSING CU 21” 60TURN 12 OHM D02N (NYL 6150Z-1223A DY DC21SPFL3 21”FCD PIN FREE (LEE 170-A01N CPT EARTH 21” 64T 2LUG 1P HSG 174-009Q POWER CORD(W/HOLD,HOUSING)L=300,4.0 3091V00439B CABINET ASSY (3090V00342) LG FLAT 5020V00657A BUTTON,CONTROL 320-062E SPRING,KNOB 5020V00656A BUTTON,POWER 3809V00296A BACK COVER ASSY SET DVD(1PHONE) .

  • Page 24: Replacement Parts List

    The components identified by mark critical for safety. REPLACEMENT PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTION LOCA. NO PART NO DESCRIPTION DIODE ICP01 0ISM948900A IC,SDA9489 28PIN SOP TP PIP D101 0DD414809ED DIODE,1N4148 TA IC01 0IZZVC0035D IC,PHILIPS 64P ST FARSI(DVD_ONLY) D102...
  • Page 25 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 26 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film critical for safety. the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 27 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film critical for safety. digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 28 The components identified by mark For Capacitor & Resistors, CC, CX, CK, CN : Ceramic RD : Carbon Film critical for safety. the charactors at 2nd and 3rd CQ : Polyestor RS : Metal Oxide Film digit in the P/No. means as CE : Electrolytic RN : Metal Film Replace only with part number specified.
  • Page 29 6200VQS004A FILTER,SAW 0FWK7252M EPCOS 38.9MHZ 5PIN Z551 6200VCT001B FILTER,BAND PASS LT5.5MH BAOTONG 5.5MHZ ACCESSORIES 3828VA0306B MANUAL,OWNERS MC019B AMATIS LG EN 077T TX 6710V00077T REMOTE CONTROLLER MC019B LG (ALL FUNCTION) 5010V00005D ANTENNA 2 POLE 3 SECTION 700MM 750MM N MISCELLANEOUS PA1101...
  • Page 30 P/NO:3854VA0083C-S(1/2) 2002.01.15...
  • Page 31 PRINTED CIRCUIT BOARD WIRING DIAGRAM COMPONENT LOCATION GUIDE MAIN & CPT(FLAT) C1 ..C4 C307..F4 C611..B3 C811 ..G3 IC621..A3 P301C ..F4 R22..E1 R301..E4 R594..B2 R909..A1 C01..B4 C401 ..G4 C612..B3 C812..E2 IC631..E1 P301D..G4 R23..E1 R302..E4 R601..B3 R910..A1 C2 ..C4 C402..F3 C621..A2 C813 ..D2 IC661 ..C2 P801A ..G1 R25..E1...

  • Page 32: Svc. Sheet

    SVC. SHEET : 3854V A0083C-S SVC. SHE...
  • Page 33 Sep.,2002 P/NO : 3828VD0115L Printed in Korea...

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Rt-21fb220px

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