LG CF-20/21S12EH Service Manual Download Page 2

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CONTENTS

Contents ................................................................................................................ 2

Safety Precautions ............................................................................................3

Specifications ..................................................................................................... 4

Control Descriptions ....................................................................................... 6

Disassembly Instructions ..............................................................................9

Adjustment ...........................................................................................................10

Troubleshooting..................................................................................................14

Exploded View .................................................................................................. 16

Exploded View Parts List ..............................................................................17

Replacement Parts List ............................................................................... 20

SVC. Sheet ................................................................................................................

Summary of Contents for CF-20/21S12EH

Page 1: ...CE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS MC 84D MODEL CF 20 21S42EH MODEL CF 20 21S12EH website http biz LGservice com e mail http www LGEservice com techsup html Jan 2001 Printed in Korea P NO 3828VD0062G ...

Page 2: ...Contents 2 Safety Precautions 3 Specifications 4 Control Descriptions 6 Disassembly Instructions 9 Adjustment 10 T roubleshooting 14 Exploded View 16 Exploded View Parts List 17 Replacement Parts List 20 SVC Sheet ...

Page 3: ...ys perform an AC leakage current check on the exposed metallic parts of the cabinet such as antennas terminals etc to be sure the set is safe to operate without damage of electrical shock Leakage Current Cold Check Antenna Cold Check With the instrument AC plug removed from AC source connect an electrical jumper across the two AC plug prongs Place the AC switch in the on positioin connect one lead...

Page 4: ... IF Vision IF 38 0MHz Color IF 33 57MHz PAL 34 42MHz NTSC Sound IF 32 5MHz B G 32 0MHz I I I 31 5MHz D K K1 33 5MHz M Power consumption 20 95W 21 100W Antenna input impedance VHF UHF 75ohm Unbalanced type Voice coil impedance 8ohm OSD On Screen Display Window 3D TYPE External in output Headphone SCART or Phone Jack Option Audio In 0 4Vrms 3dB over 10Kohm Audio Out 0 4Vrms 3dB below 1Kohm Video In ...

Page 5: ...HZ 60HZ PAL 6 5MHZ 60HZ SECAM 5 5MHZ 60HZ SECAM 6 0MHZ 60HZ SECAM 6 5MHZ 60HZ NTSC 3 58 5 5MHZ NTSC 3 58 6 0MHZ NTSC 3 58 6 5MHZ Receiving Channel VHF Band PAL SECAM B 2 12 PAL SECAM D 1 12 SECAM K1 2 9 NTSC M US 2 13 NTSC M JAPAN 1 12 UHF Band PAL SECAM G 21 69 PAL I 21 69 SECAM K 21 69 PAL K 13 56 NTSC M US 14 78 NTSC M JAPAN 13 62 Function Reception of broadcast and play back for Video Tape Rec...

Page 6: ...me Up Down switches the set on from standby selects a programme or a menu item scans programmes automatically F G Volume Down Up adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 5 DUAL option selects the language during dual language broadcast option selects the sound output 6 ARC Aspect Ratio Control changes the picture format 7 EYE option switches t...

Page 7: ... powered by two AA type batteries To load the batteries turn the remote control handset over and open the battery compartment Install two batteries as indicated by the polarity symbols and marked inside the compartment Note To avoid damage from possible battery leakage remove the batteries if you do not plan to use the remote control handset for an extended period of time 5 8 2 4 7 1 3 6 9 0 PSM Q...

Page 8: ...a menu item F F G G Volume Down Up adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 6 DTS Digital Turbo System SOUND option selects Digital sound DTS PICTURE option selects Digital picture 7 EYE option adjusts picture according to the surrounding conditions 8 AUDIO VIDEO IN SOCKETS AV2 option Connect the audio video out sockets of external equipment t...

Page 9: ... speaker R L on the front cabinwet 3 Refer ro Exploded View for disassembling woofer speaker in the back cover CPT Removal 1 Pull out the CPT board from the CPT neck 2 Place the front cabinet on soft material not to mar the front surface or damage control knobs 3 Remove 4 screws securing the picture tube mounting brackets to the front cabinet 4 Carefully separate CPT from the front cabinet PICTURE...

Page 10: ...the RF signal is at least 1mV 60dBu the picture will be noise free in any area Adjusting RF AGC to one end of rotation will usually cause a relatively poor signal to noise ratio Adjusting to the other end of rotation will usually cause a degradation of over load capabilities resulting in color beats or adjacent channel interference O Screen Voltage Adjustment 1 Tune the TV set to receive a digital...

Page 11: ... VOL or VOL button for GG031 5 Adjust VOL or VOL button in each status of Rg Bg for X 281 8 Y 288 8 with color analyzer 6 Press OK V button to memorize the adjustment data O Hold Down check Short J139 and ZD747 and check if the TV set turns into stand by O HOTEL TV Mode NOTE This mode is useful for HOTEL TV MODEL Dealer or HOTEL manager can use this option 1 AFTER SELECTING HOTEL MODE CAN NOT CHAN...

Page 12: ... Data SYSTEM SCART EYE UBB AV2 Code 00 01 10 11 0 1 0 1 0 1 0 1 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01 01 01 01 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Function Remark BG I DK BG I DK M ONLY ONLY DUAL PHONO JACK AV1 SC...

Page 13: ... 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 M M M M E E E E M M M M E E E E M M M M E E E E M M M M E E E E 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 ...

Page 14: ... in out of IC841 Check u COM pin15 low Check replace Q802 Check replace D806 IC803 R809 Check replace Fuse DB801 IC801 Check replace DB801 R811 Normal Abnormal Yes Yes Yes Yes No No No No No No OK 254 340V Open 0V TROUBLESHOOTING NO RASTER SOUND OK Check the Heater voltage of CPT 6 6 5Vrms Check FR704 FR901 P302 P902 Check FBT T701 Check the Heater pulse of FBT T701 Check Ik Current of IC501 pin18...

Page 15: ...y OSD displayed Check receiving system in MENU excute Auto program Yes OK Not OK Check IC01 pin9 10 V Sync H Sync Check IC01 pin36 37 XLC EXLC IC01 No Go to NO SOUND PICTURE OK Does the Auto program operate properly Store in manual program MENU Check 5V 33V IIC Bus Line of TUNER Is the CVBS signal OK IC501 pin6 Check R G B signal at IC501 pin19 20 21 Check 5V 33V IIC Bus Line Yes Not OK Not OK OK ...

Page 16: ... 16 943 700 560 340 400 530 520 913 153 150 P801 170 112 320 330 122 121 550 120 310 600 EXPLODED VIEW 20 21S42EH ...

Page 17: ... 320 062E SPRING KNOB 330 5020V00363A 5020V00367A BUTTON POWER 340 5020V00364A 5020V00366A BUTTON CONTROL 2KEY 400 3809V00174B 3809V00174B BACK COVER ASSY LGEIL LOCAL 520 6871VMM678A 6871VMM678B PWB ASSY MAIN MC 84D 6871VMM678F 6871VMM678E PWB ASSY MAIN MC 84D IL LGEGF 530 6871VSM250H 6871VSM250H PWB ASSY AV ST LGEIL ONLY 550 6871VSM535A 6871VSM535A PWB ASSY CONT S40 FRONT CKD 560 6871VSM414A 6871...

Page 18: ... 18 913 510 112 153 170 150 511 400 943 121 104 300 700 310 320 330 120 520 530 P801 EXPLODED VIEW 20 21S12EH ...

Page 19: ...ET CPT EARTH 300 3091V00119B 3091V00119B CABINET ASSY 310 5020V00209A 5020V00208A BUTTON CONTROL 6KEY 320 320 062H 320 070G SPRING COIL 330 5020V00211A 5020V00210A BUTTON POWER 400 3809V00085A 3809V00085A BACK COVER ASSY 520 6871VMM678C 6871VMM678D PWB ASSY MAIN 530 6871VSM250H 6871VSM250H PWB ASSY AV ST LGEIL ONLY 700 0IGL120104A 0IGL120104A IC CDS SENSOR MODULE P1201 04 913 332 057B 332 057J SCR...

Page 20: ...PTION IC01 Ò ICS01 IC02 IC03 IC04 IC202 IC301 IC501 IC601 IC602 IC801 IC802 IC803 IC804 IC840 IC841 IC901 PG01 D01 D101 D401 D501 D502 D503 D504 D509 D741 D742 D743 D802 D803 D804 D805 D806 D807 D808 D901 D902 D903 D904 DB801 LD01 ZD01 ZD02 0ICTMHY007A 0ICTMHY008A 0ISG742900A 0IAL241600B 0IFA754207A 0ISA722200A 0ISG405200B 0IPH835150A 0IPH884212A 0ISG729700A 0IFA754207A 0ILI817000G 0ITF435000A 0IS...

Page 21: ... C527 C528 C531 C532 C533 C534 C537 C538 C539 C540 C541 C542 C543 C544 C545 C548 C550 C551 C552 C553 C601 C602 C604 C607 C609 C611 C613 C616 C633 C651 C652 C653 C659 C661 C662 C741 C743 C744 C745 C746 C747 C748 181 007H 0CE225CK636 181 007F 181 442Z 0CC2210K415 0CC2710K415 0CQ1021N509 181 442Z 0CN1040K949 0CE107DF618 0CE106DF618 0CN1010K519 0CE104DK618 0CQ2721N409 0CE105DK618 0CQ4721N509 0CN1020K5...

Page 22: ...18U 100V K POLY TP5 0 0056U 100V K POLY LOCA NO PART NO DESCRIPTION CS20 CS21 CS22 CS23 CS25 CS26 CS27 CS28 CS29 J123 FB601 FB602 FB741 FB801 FB802 FB803 FB804 FB805 L02 L03 L04 L05 L06 L101 L301 L302 L401 L503 L506 L507 L508 L510 L521 L522 L523 L652 L653 L802 L901 LS01 T401 T701 Ò 21Ó T802 AR01 FR703 0CQ5621N509 0CE474DK618 181 007H 0CE474DK618 181 007H 181 007H 0CE226DF618 0CE106DF618 0CN1040K94...

Page 23: ... R74 R80 R81 R82 R83 R84 R85 R86 R90 R91 R92 R101 R102 R103 R104 R105 R106 R108 R109 R110 R111 R115 R118 R208 R210 R229 R230 R235 R236 R236 R237 R238 R238 R240 R241 R242 R243 R290 R291 R301 R302 Ò 21Ó R304 Ò 21Ó R305 0RD2200F609 0RD1000F609 0RD2200F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1000F609 0RD1001F609 0RD1001F609 0RD4700F609 0RD4700F609 0RD4700F609 0RD...

Page 24: ...RIPTION R666 R667 R668 R742 R743 R745 R746 R747 Ò 21Ó R750 R752 R753 R754 R801 R802 R803 R804 R805 R806 R808 R809 R811 R812 R813 R814 R815 R816 R901 R902 R903 R907 R908 R909 R911 R912 R913 R914 R1101 R1102 R1103 R1104 R1105 RS01 RS02 RS03 RS04 RS05 RS06 SG901 SG902 0RD1000F609 0RD1002F609 0RD1000F609 0RD5100H609 0RD1000F609 0RF0222H609 0RD1001F609 0RS8201H609 0RD1002H609 0RD4701H609 0RD1201H609 0R...

Page 25: ...H PUSH SDKEA3 IEC 250V 8A HORIZO SWITCH TACT 2LEAD 100G TA LG C D NON SWITCH TACT 2LEAD 100G TA LG C D NON SWITCH TACT 2LEAD 100G TA LG C D NON SWITCH TACT 2LEAD 100G TA LG C D NON SWITCH TACT 2LEAD 100G TA LG C D NON SWITCH TACT 2LEAD 100G TA LG C D NON FILTER TRAP TPWA02B TF21 MURATA 5 5MHZ FILTER TRAP TPS6 0MB TF21 MURATA 6 0MHZ FILTER LINE SQE2930 18MH PHY TURN CRYSTAL HC49U SUNNY RADIAL 8 000...

Page 26: ...Service Sheet of MC 84A Service Sheet of MC 84A P N 3854VA0037A S 980427 Video Composite Sound Chroma WAVEFORM ...

Page 27: ...1 R19 D1 R20 D2 R21 F1 R22 D1 R24 D1 R25 C1 R26 B2 R27 B2 R28 D1 R29 D1 R30 D2 R31 D2 R32 C1 R33 C1 R34 D2 R35 B2 R36 D3 R38 D2 R39 D2 R40 C2 R42 C3 R43 C2 R44 C2 R52 C1 R53 C2 R54 D2 R57 D3 R58 D2 R59 D2 R61 D2 R63 D2 R65 D2 R68 D2 R70 D2 R72 D2 R74 D2 R80 D2 R81 D2 R82 D2 R83 D2 R84 C2 R85 C2 R86 C2 R90 C1 R91 D1 R92 D1 R101 B5 R102 B5 R103 B5 R104 A5 R105 A5 R106 B5 R108 B5 R109 B5 R110 B5 R111...

Page 28: ...SVC SHEET 3854V A0079A S ...

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