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LG CF-14D70K Service Manual

Chassis: mc-019a
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P/NO : 3828VD0104T
All manuals and user guides at all-guides.com
Jan.,2002
Printed in Korea
COLOR TV
SERVICE MANUAL
CHASSIS : MC-019A
MODEL : CF-14/20/21D70K CF-14D10K
MODEL :
CF-20F60K CF-21F30K
MODEL :
CF-20/21S31KE/KEX
MODEL :
CF/CT-14/20/21K50KE/53KE
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 CF-14D70K

  • Page 1 All manuals and user guides at all-guides.com website:http://biz.LGservice.com e-mail:http://www.LGEservice.com/techsup.html COLOR TV SERVICE MANUAL CHASSIS : MC-019A MODEL : CF-14/20/21D70K CF-14D10K MODEL : CF-20F60K CF-21F30K MODEL : CF-20/21S31KE/KEX MODEL : CF/CT-14/20/21K50KE/53KE CAUTION BEFORE SERVICING THE CHASSIS, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. Jan.,2002 P/NO : 3828VD0104T Printed in Korea...
  • Page 2: Table Of Contents

    All manuals and user guides at all-guides.com 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 Exploded View ....................18 Exploded View Parts List ................19 Replacement Parts List ................
  • Page 3: Safety Precautions

    All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com 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.
  • Page 5 All manuals and user guides at all-guides.com 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.
  • Page 6: Specifications

    All manuals and user guides at all-guides.com SPECIFICA TIONS 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,L/L’ 32.9MHz (I/I) NTSC M 32.4MHz (D/K) NTSC 4.43 34.4MHz (M) Intermediate Frequency (Unit : MHz)
  • Page 7: Description Of Controls

    All manuals and user guides at all-guides.com DECRIPTIONS OF CONTROLS All the functions can be controlled with the remote control handset. Some functions can also be adjusted with the buttons on the front panel of the set. Remote control handset Before you use the remote control handset, please install the bat- teries.
  • Page 8 All manuals and user guides at all-guides.com 10. MUTE switches the sound on or off. 11. TV/AV selects TV or AV mode. clears the menu from the screen. switches the set on from standby. 12. I/II/ (option) selects the language during dual language broadcast. (option) selects the sound output.
  • Page 9 All manuals and user guides at all-guides.com Front panel Shown is a simplified representation of front or side panel. Here shown may be somewhat different from your set. VIDEO VIDEO ON/OFF MENU OK VIDEO (L)-AUDIO-(R) P-TURBO-S AUDIO AUDIO 2 3 4 TURBO ON/OFF MENU OK...
  • Page 10: Disassembly Instructions

    All manuals and user guides at all-guides.com 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

    All manuals and user guides at all-guides.com 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.
  • 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 AGC Voltage 2.7! 0.05V 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

    All manuals and user guides at all-guides.com 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...
  • Page 15 All manuals and user guides at all-guides.com 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.
  • Page 16 All manuals and user guides at all-guides.com 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...
  • Page 17: Block Diagram

    All manuals and user guides at all-guides.com BLOCK DIAGRAM - 17 -...
  • Page 18: Exploded View

    All manuals and user guides at all-guides.com EXPLODED VIEW : 14/20/21D70K - 18 -...
  • Page 19: Exploded View Parts List

    All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 14” 20” 21” 343-B52A 343-B52A SUPPORTER,PCB 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 6400VA0001B 6400VA0021B 6400VA0021B...
  • Page 20 All manuals and user guides at all-guides.com EXPLODED VIEW : 14D10K - 20 -...
  • Page 21 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 2055-00744N CPT SET A34KPU02XX 00T7ND 2055-00744K CPT SET A34KPU02XX 00L7ND 6400VA0001B SPEAKER,GENERAL 16 OHM 2.5/5W 84DB 150-D02W...
  • Page 22 All manuals and user guides at all-guides.com EXPLODED VIEW : 20F60K - 22 -...
  • Page 23 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 2426VDC0008 CPT SET 2055-01221H A48QAD220X 03T7ND 6400VA0019D SPEAKER,FULLRANGE H905/020801B 8OHM 7/1 150-D02Y COIL,DEGAUSSING CU 20”...
  • Page 24 All manuals and user guides at all-guides.com EXPLODED VIEW : 14/20/21K50KE/53KE - 24 -...
  • Page 25 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO LOCA. NO DESCRIPTIONS 14” 20” 21” 343-B52A 343-B52A 343-B52A SUPPORTER,PCB 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 2055-00744M 2055-01221M...
  • Page 26 All manuals and user guides at all-guides.com EXPLODED VIEW : 21F30K - 26 -...
  • Page 27 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. LOCA. NO PART NO DESCRIPTIONS 343-B52A SUPPORTER,PCB 2426VSD0019 CPT SET A51QAE320X000TIB 6400VA0019D SPEAKER,FULLRANGE H905/020801B 8OHM 150-D02X COIL,DEGAUSSING CU 21”...
  • Page 28 All manuals and user guides at all-guides.com EXPLODED VIEW : 14/20/21S31KEX - 28 -...
  • Page 29 All manuals and user guides at all-guides.com The components identified by mark critical for safety. EXPLODED VIEW PARTS LIST Replace only with part number specified. PART NO DESCRIPTIONS LOCA. NO 14” 20” 21” 2055-00744N 2426GCA40CP 2426VSD0019 CPT SET 6400VA0020D 120-C77G 120-C77G SPEAKER,FULLRANGE 6400VG0002A...
  • Page 30: Replacement Parts List

    All manuals and user guides at all-guides.com 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 D901 0DR210009AC DIODE,RECTIFIER BAV21 TP D902 0DR210009AC DIODE,RECTIFIER BAV21 TP IC01...
  • Page 31 All manuals and user guides at all-guides.com 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.
  • Page 32 CONNECTOR C815 0CK4710W515 470PF 500V K B TR C816 0CN1030F679 10000P 16V M Y TA52 P01A 366-921B CONNECTOR,2.5MM 3P GIL-G LG CABLE . C817 0CK4710W515 470PF 500V K B TR P301 366-043K CONNECTOR,PLUG(4P) C818 0CE107BH618 100UF KME 25V M FL TP5...
  • Page 33 All manuals and user guides at all-guides.com 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.
  • Page 34 6620VBA003A SOCKET,CPT PCS031A 7PIN R815 0RD0751H609 7.5 OHM 1/2 W 5.00% TA52 TH801 163-054F THERMISTOR,PTC J502P84D140M290Q TUNER,TAFL-G579D LG MULTI FS W/S 38. R816 0RD2001F609 2K OHM 1/6 W 5.00% TA52 TU101 6700VPF009V R901 0RD2200F609 220 OHM 1/6 W 5.00% TA52 “...
  • Page 35 All manuals and user guides at all-guides.com P/NO:3854VA0083A-S 2001.04.20...
  • Page 36 All manuals and user guides at all-guides.com PRINTED CIRCUIT BOARD WIRING DIAGRAM COMPONENT LOCATION GUIDE MAIN & CPT C01..B4 C403 ..G4 C607..B3 C811 ..G3 F812 ..E2 L801 ..E4 R05..B4 R218 ..D5 R554 ..D4 R820..F4 C02..B4 C404 ..G4 C611..B3 C812..E2 F801A ..G2 L802 ..E3 R06..B3 R219 ..D5...
  • Page 37: Svc. Sheet

    All manuals and user guides at all-guides.com SVC. SHEET : 3854V A0083A-S SVC. SHE...