LG RF-21FA20, Service Manual

Page 1: ...E MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS MC 014A MODEL RF 21FA20 Q PQ MODEL CF 21Q20EH website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...2 Safety Precautions 3 Specifications 4 Control Descriptions 5 Disassembly Instructions 8 Adjustment Instructions 9 T rouble Shooting 12 Exploded View 16 18 Exploded View Parts List 17 19 Replacement Parts List 20 SVC Sheet ...

Page 3: ...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 of...

Page 4: ...O OSD On Screen Display WINDOW 3D Type O Voice coil impedance 8 ohm O Sound output 10W 10W Max 12W 12W Dual Stereo AV Stereo O External connection Head Phone Jack A V in 1 pair A V in out O External In Output Audio In 0 5Vrms 3db over 10Kohm Audio Out 0 5Vrms 3db below 1Kohm Video In Out 1Vp p 3db 75ohm O Feature Auto programme Manual programme Digital Eye Digital Comb Filter Auto Sleep Dynamic Fo...

Page 5: ...6 TURBO PICTURE SOUND BUTTON selects Turbo picture sound 7 D D E E Programme Up Down selects a programme or a menu item switches the set on from standby F F G G Volume Up Down adjusts the volume adjusts menu settings OK accepts your selection or displays the current mode 8 NUMBER BUTTONS switches the set on from standby or directly select a number 9 PSM Picture Status Memory recalls your preferred...

Page 6: ...P or Q VIEW returns to the previously viewed programme 17 SLEEP sets the sleep timer COLOURED BUTTONS These buttons are used for teletext only TELETEXT models or programme edit Battery installation The remote control handset is powered by two AAA type batteries To load the batteries turn the remote control handset over and open the battery compartment Install two batteries as indicated by the pola...

Page 7: ...rent mode D D E E Programme Up Down selects a programme or a menu item switches the set on from standby F F G G Volume Down Up adjusts the volume adjusts menu settings 8 D D E E adjusts the function or selects a programme switches the set on from standby 9 AUDIO VIDEO IN SOCKETS AV2 Connect the audio video out sockets of external equipment to these sockets 10 HEADPHONE SOCKET option Connect the he...

Page 8: ...2 Remove respective 6 screws for speaker on the front cabinet Fig 2 2 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 TUBE HANDLING CAUTION Due to high vacuum...

Page 9: ...he best focus of area A 4 Repeat above step 2 and 3 for the best overall focus O Deflection Data Adjustment Line SVC 2 NOTE How to enter into the Line Service Mode with a remocon 1 Power off 2 Press the Red button 3 Press the Green button 4 Press the Yellow button 5 Press the Cyan button 6 Press the OK button 7 Power On 1 Preparation for Deflection Adjustment 1 Tune the TV set to receive a PAL B G...

Page 10: ...l X 268 8 Y 273 8 6 Adjust High Light status of RG and BG with VOL or VOL at CG 370 until X 268 8 Y 273 8 7 Repeat above step 5 and 6 until each status of High Light and Low Light Initial Data List PAL VA VL SC VS HS EW ET EP ES EC POP P Vertical Amplitude Vertical Lineality S Correction Vertical Shift Horizontal Shift East West Width East West Trapezim East West Parabola East West Symmet East Wes...

Page 11: ...ith REAR AV2 Without TEXT With TEXT Without TOP TEXT With TOP TEXT NO Channel Name Display Channel Name Display Without TURBO Function With TURBO Function Without TURBO BOOSTER With TURBO BOOSTER Cable Band AGC ADJ 0 1 0 1 0 1 0 1 0 1 0 1 0 1 2 3 MONO VOL SYS A2 ST DUAL CH AU 200PR Option Code Function Remark Rear AV2 Option Except China Australia China Australia NO 200PR Option With 200PR Option ...

Page 12: ...Z 18V Check Replace Q401 Q402 T401 110V 33V Check Replace D850 L853 T402 Check the voltage at pin 54 of IC01 3 3V 0V Check Replace IC853 3 FR406 D408 D858 Q856 Check Replace Q05 IC851 IC802 3 IC856 No Power ON SMPS working No Power Not working SMPS 130 380V 0V 0V Check the voltage at pin4 of STR Check Replace IC801 and the secondary section High Low 0V 0V 0V NORMAL NO Check Replace FR403 FR413 D40...

Page 13: ...m at pin42 44 of IC01 Check the waveform at pin14 of IC141 Check Replace ICN01 Check Replace IC141 Check Replace IC01 Check Replace CPT PCB Assy NG 6 0 6 4Vrms 0V Normal Normal No Abnormal Normal Normal No Check Replace IC01 Check Replace FR402 D404 IC302 Check the waveform at pin36 of IC01 Check the waveform at pin1 of IC302 Check the waveform at R406 Check Replace Q302 Q303 Check Replace D401 D4...

Page 14: ...eck the waveform at pin47 of ICN01 Check Replace XN01 ICN01 Check the waveform at pin12 of IC141 Check Replace IC01 Check Replace Z102 IC141 5V 0V Check the waveform at pin21 22 of ICN01 Check the waveform at pin1 3 of ICN02 Check Replace ICN02 Check Replace P605 6 A H P Jack Check Replace ICN01 No Sound Picture OK No Sound from H P Jack Option Main Sound OK 0V 32V Yes No No NORMAL Abnormal Normal...

Page 15: ...the waveform at pin21 of IC01 CVBS In Check Replace ICN01 Check Replace IC01 IC141 Is there video signal at pin13 of ICN101 Check Replace ICN101 IIC Bus Is there video signal at pin28 of ICP101 Check pin15 18 of ICP01 Check CP131 Check Replace ICP01 IIC Bus Check pin27 30 of IC01 Check RP11 14 CP15 18 Check Replace IC01 7 Don t Catch Channel No PIP 0V 33V 0V 5V No Yes Abnormal Normal Normal Abnorm...

Page 16: ...913 170 150 153 112 520 P801 530 560 600 700 330 320 310 120 300 123 943 400 550 510 540 EXPLODED VIEW 21FA20 16 ...

Page 17: ...14A 21 FCD 8 LGEIL 6871VSM941D PWB ASSY CPT 014A 21 N A 520 6871VMM725B PWB ASSY MAIN 014A 21FA20PQ 8 IL 6871VMM725L PWB ASSY MAIN 014A 21FA20PQ N ALLIED 6871VMM725C PWB ASSY MAIN 014A 21FA20Q 8 IL 6871VMM725D PWB ASSY MAIN 014A 21FA20 8 IL 530 6871VSM943A PWB ASSY MPX 014A 6871VSM943B PWB ASSY MPX 014A FA20PQ 8 IL 540 6871VSM942A PWB ASSY PIP 014A Q20 8 LGEIL 550 6871VSM945A PWB ASSY IF 014A 8 LG...

Page 18: ... 18 913 170 150 153 112 400 943 560 120 124 123 300 700 330 315 320 310 P801 520 530 550 540 EXPLODED VIEW 21Q20 ...

Page 19: ... 5020V00337B BUTTON POWER 400 3809V00154X BACK COVER ASSY 510 6871VSM941A PWB ASSY CPT 014A 21 FCD 8 LGEIL 520 6871VMM725A PWB ASSY MAIN 014A 21Q20EH 530 6871VSM943A PWB ASSY MPX 014A 540 6871VSM942A PWB ASSY PIP 014A Q20 8 LGEIL 550 6871VSM945A PWB ASSY IF 014A 8 LGEIL 560 6871VSM944A PWB ASSY CONTROL 600 6871VSM944A PWB ASSY Q20 SIDE AV LGEIL 700 0IGL120104A IC CDS SENSOR MODULE P1201 04 913 332...

Page 20: ...EC TR KTA1024 Y KTA949 TP KEC TR KSC945C Y TP SAMSUNG TR KTA1266 TP Y KTA1015 KEC LOCA NO PART NO DESCRIPTION HIC01 ICN01 ICP01 ICP02 ICN02 IC01 D850 IC03 ICN03 ICN05 IC05 IC06 IC07 IC09 ICN101 IC141 IC301 IC601 IC302 IC801 IC802 IC803 IC851 IC853 IC855 IC856 IC901 IC1610 D101 D301 D302 D401 D403 D404 D405 D406 D408 D410 D412 D501 D503 D505 D506 D601 D602 D603 D802 D803 D804 0IZZVF0017B 0IZZVF0017...

Page 21: ... C208 C209 C302 C303 C306 C307 C308 C309 C310 C312 C313 C314 C315 C401 C402 C403 C405 C406 C407 C408 C409 C410 C411 C412 C413 C414 C415 C416 C417 C419 C420 C421 C422 C501 C503 C504 C507 C510 C511 C512 C516 C517 C518 C520 C559 C563 C564 C565 0CK224DF56A 0CK224DF56A 0CE106DF618 0CE226DF618 0CE227DD618 0CE226DF618 0CE226DF618 0CQ3341N401 0CE107BK618 0CQ2231N509 0CQ1031N509 0CE476DJ618 0CN4710K519 0CQ...

Page 22: ...10 C911 C912 C913 C1101 C1102 C1111 C1112 C1118 C1208 C1664 C1680 C1681 C1682 C1683 C1685 C1686 C1687 C1688 C1689 C1690 C1692 C1693 C1694 CN05 CN07 CN10 CN11 CN12 CN13 CN16 CN19 CN20 CN21 CN23 CN24 CN29 CN30 CN32 CN34 CN35 CN36 CN37 CN38 CN39 CN40 CN41 0CE107DF618 0CN2230H949 0CE106DR618 0CQZVBK002A 0CE475DR618 0CK1020W515 0CK10201515 0CK1020W515 0CE476DF618 0CK22202515 0CE107DD618 0CN4710K519 0CQ...

Page 23: ...9 L71 L101 L102 L121 L141 L142 L401 L402 L501 L853 L901 L1111 L1112 L1113 L1114 LN01 LN03 LN04 LN05 LN06 LN07 LN08 LN101 LP01 LP12 LP13 LP14 T401 T402 T802 JW1B P605B P651B P652A P901 P902 P1203 F854 F855 FR401 FR402 FR403 FR406 FR413 0LA0102K119 0LA0102K119 0LA1000K119 0LA0470K119 0LA1000K119 0LA0102K119 0LA0102K119 0LA0102K119 0LA0470K119 0LA0680K119 0LA0122K119 150 717K 6140VE0001N 0LA0471K119 ...

Page 24: ...226 R227 R241 R302 R305 R306 R307 R308 R309 R310 R311 R312 R313 R314 R315 R316 R317 R319 R320 R321 R322 R323 R324 R325 R326 R327 R328 R330 R331 R401 R402 R403 R404 R405 R408 R409 R410 R411 R413 R414 R415 R416 R417 R419 R421 R422 R423 0RD4700F609 0RD1800F609 0RD0752F609 0RD5101F609 0RD5101F609 0RD1000F609 0RD5101F609 0RD5101F609 0RD0752F609 0RD0101H609 0RN4700F409 0RD1002F609 0RD2202F609 0RD2000F60...

Page 25: ...6 W 5 00 TA52 6 2K OHM 1 6 W 5 00 TA52 4 7K OHM 1 6 W 5 00 TA52 3 3 OHM 1 2 W 5 00 TA52 1K OHM 1 6 W 5 00 TA52 3 3 OHM 1 2 W 5 00 TA52 68K OHM 1 6 W 5 00 TA52 150 OHM 1 6 W 5 00 TA52 1K OHM 1 6 W 5 00 TA52 LOCA NO PART NO DESCRIPTION 0RKZVTA001K 180 A03H 0RD0681H609 0RD4701F609 0RD1001F609 180 A01D 0RKZVTA001C 0RD3301F609 0RS2202K607 0RS2702K607 0RD3301F609 0RD3601F609 0RS0221K607 0RD0332H609 0RD0...

Page 26: ... 6 W 5 00 TA52 10 OHM 1 6 W 5 00 TA52 10 OHM 1 6 W 5 00 TA52 LOCA NO PART NO DESCRIPTION SG901 SG902 SG903 SW01 SW02 SW03 SW04 SW05 SW06 SW801 SW1101 SW1102 SW1103 SW1104 SW1111 T801 X01 X141 XN01 XP01 Z141 Z142 A1 A2 A2 A2 JK201 JK202 JK1101 JK1201 P02A PA1101 SK901 TH801 TU101 TU121 VD801 VD1111 165 004A 165 004A 165 004A 140 315A 140 315A 140 315A 140 315A 140 315A 140 315A 6600VM2002A 140 315A...

Page 27: ...P N 3854VA0087A S1 1 2 Date 2001 03 19 ...

Page 28: ...01A F1 P02A F1 P03A C1 P04A C1 P05A C1 P06A B1 P08A C1 P09A C4 P09B C1 P141A A4 P201A D5 P202A C5 P203A C5 P401A F4 P401B F4 P401C F4 P401D F4 P402A F5 P402B F5 P403A E5 P551A B4 P552A C4 P605A A3 P651A A1 P653A A1 P801A G1 P801B G1 P802A E1 P802B E1 P803A F1 P803B F1 Q01 D1 Q02 E1 Q03 B2 Q04 B2 Q05 B1 Q201 D5 Q301 D4 Q303 D4 Q401 G4 Q402 G3 Q403 G3 Q501 C5 Q503 C3 Q505 C2 Q506 C2 Q507 C2 Q508 B2 ...

Page 29: ...SVC SHEET 3854V A0087A S1 ...

Page 30: ...Mar 2001 P NO 3828VD0070E ...