LG Lafinion 55, Service Manual

Page 1: ...ERVICE MANUAL CAUTION BEFORE SERVICING THE CHASSIS READ THE SAFETY PRECAUTIONS IN THIS MANUAL CHASSIS SC 023A MODEL RP 21FB70 Lafinion 55 website http biz LGservice com e mail http www LGEservice com techsup html ...

Page 2: ...Sub carrier frequency 42 17 MHz Center frequency 44 MHz CHASSIS CONSTRUCTION IC Solid state chassis PICTURE TUBE Type No A51QDJ279X SOUND OUTPUT 3W 3W CABINET Plastic ABBREVIATIONS Used in this book ADJ Adjustment or Adjust AFC Automatic Frequency Control AGC Automatic Gain Control AMP Amplifier CRT Cathode Ray Tube DEF Deflection DET Detector FBT Flyback Transformer H V High Voltage OSC Oscillato...

Page 3: ...d on the chassis schematic and take corrective action 2 Read and comply with all caution and safety related notes on or inside the receiver cabinet on the receiver chassis or on the picture tube 3 Design Alteration Warning Do not alter or add to the mechanical or electrical design of this TV receiver Design alterations and additions including but not limited to circuit modifications and the additi...

Page 4: ...T 0 4 2 Adjustment 1 Press ADJ or SVC button on the remote control to make one horizontal line 2 Turn the Screen volume not to see one horizontal line and turn oppositely until it starts to display 5 Purity and Convergence Adjustment 5 1 Purity Adjustment 1 Preliminary steps 1 Receive Red Raster Pattern 2 Degauss CPT and Cabinet with degaussing coil 2 Horizontal Line Adjustment 1 Pre adjust Static...

Page 5: ...with the white balance meter 7 Focus Voltage Adjustment Adjust after operating the receiver enough 7 1 Preliminary steps 1 Receive Digital Pattern 2 Set Picture condition to CLEAR 7 2 Adjustment Adjust center focus with upper Focus volume and adjust corner focus with lower Focus volume Repeatedly adjust focus until getting proper focus 8 Sub Brightness Adjustment Do white balance adjustment first ...

Page 6: ... 7 S 8 S 9 S 10 S 11 S 12 S 13 S 14 S 15 S 16 S 17 S 18 S 19 S 20 S 21 S 22 S 23 S 24 S 25 S 26 S 27 S 28 S 29 S 30 S 31 Adjustment AGC Voltage Adj Horizontal Postilion Vertical Position Vertical SIZE R CUT OFF G CUT OFF B CUT OFF Inside TEST Pattern Range 0 63 0 31 0 7 0 63 0 255 0 255 0 255 0 127 0 127 0 63 0 15 0 15 0 3 0 3 0 1 0 1 0 3 0 7 0 1 0 1 0 1 0 3 0 3 0 7 0 3 0 1 0 1 0 1 0 1 0 1 0 70 OS...

Page 7: ... BPT TOF V AGC V R BIA SYN SEP VOL ATT OVER MOD OSD POSITION Initial setting 50 15 3 40 128 128 128 64 64 36 9 3 0 3 1 1 1 3 0 0 0 3 2 1 0 1 0 1 0 86 0 17 Remark Necessary Necessary Necessary Necessary Necessary Necessary Necessary Necessary Necessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unnecessary Unne...

Page 8: ... 8 EXPLODED VIEW RP 21FB70 943 400 510 174 504 120 600 320 330 300 530 310 121 153 150 170 913 112 500 ...

Page 9: ...0 5020V00905A BUTTON CONTROL RT 21FB70 ABS HF 380 6KEY LGEIN EXPORT 320 320 062H SPRING COIL 330 5020V00906A BUTTON POWER RT 21FB70 ABS HF 380 6KEY LGEIN EXPORT 400 3809V00431D BACK COVER ASSEMBLY RP 21FB70 DVD 1PHONE IN LOCAL 500 3141VMNN35T CHASSIS ASSEMBLY MAIN SC023A 21F ST S EAR DVD 11P FB70 LGEIN 504 351 015A LINK POWER S W 510 6871VSN175B PCB ASSEMBLY SUB CRTMIN SC023A 21 FLAT 530 6871VSMQ3...

Page 10: ... 10 EXPLODED VIEW Lafinion 55 112 913 150 153 510 174 943 400 500 300 540 530 310 120 600 700 170 330 ...

Page 11: ... NON 400 3809V00363E BACK COVER ASSEMBLY RP 21FC40 DVD 1PHONE CKD 3809V00363H BACK COVER ASSEMBLY LGETT 500 3141VMNN35Q CHASSIS ASSEMBLY MAIN 21F ST S EAR DVD 11P EYE FC40 LGEIN 3141VMNS61A CHASSIS ASSEMBLY MAIN SC023A LGETT 510 6871VSN175B PCB ASSEMBLY SUB CRTMIN SC023A 21 FLAT 6871VSN175A PCB ASSEMBLY SUB CRTMIN SC023A LGETT 530 6871VSMQ36C PCB ASSEMBLY SUB CONT SC023A FC40 CONTROL LED LGEIN 871...

Page 12: ...C804 IC805 Q101 Q102 Q12 Q13 Q16 Q191 Q192 Q220 Q241 Q301 Q401 Q402 Q403 Q504 Q621 Q671 Q672 Q901 Q902 Q903 Q904 D22 D23 D301 D302 0IMCRAL011A 0IFA754207A 0IKE780500P 0ISA795600A 0IPRPSA006A 0ICTMTO001C 0ICTMTO010A 0ISG729700A 0ISG726600A 0ISA722200A 0IFA754207A 0IMCRMN013A 0IFA753307A 0ILI817000G 0ILI817000G 0ISK665413C 0ISS781200H 0ISK110000A 0TR319709AB 0TR945009AA 0TR103009AD 0TR733009AA 0TR10...

Page 13: ...F STD 50V M LOCA NO PART NO DESCRIPTION C404 C406 C407 C408 C409 C412 C413 C414 C417 C5 C50 C502 C503 C506 C51 C511 C512 C513 C514 C517 C523 C524 C54 C540 C552 C56 C601 C602 C603 C605 C606 C607 C611 C612 C661 C662 C663 C664 C665 C666 C667 C668 C669 C670 C672 C673 0CK4710W515 0CE107DF618 0CE106DH618 0CE225DP618 0CE227DD618 181 013V 181 013P 0CK2220W515 181 015E 181 015D 181 091U 0CN1030F679 0CN1010...

Page 14: ...L1 L102 L104 L1301 L201 L202 L401 L402 L662 L802 L901 T402 T403 T801 FR301 FR401 FR403 FR501 FR805 FR816 J510 J627 J628 J671 R100 R101 R102 R103 R104 R105 R107 R11 R110 R1101 R1102 R1103 R1104 R111 R112 R1204 R1222 R123 R13 6613V00004B 380 068D 0LA0102K119 0LA0152K119 0LA0820K119 0LA1000K139 0LA0472K119 0LA0152K119 0LA0152K119 6140VE0001V 6140VB0001F 0LA0152K119 150 C02F 0LA2700K139 6174V 6006H 15...

Page 15: ...OCA NO PART NO DESCRIPTION R304 R305 R306 R307 R308 R309 R310 R311 R312 R315 R316 R37 R38 R39 R401 R402 R403 R404 R405 R406 R407 R408 R409 R410 R412 R413 R414 R416 R418 R420 R421 R423 R48 R501 R502 R503 R504 R505 R506 R507 R508 R509 R511 R512 R514 R521 R522 R524 R526 R527 0RD0471H609 0RD0561H609 0RD0471H609 0RD1202F609 0RD8202F609 0RD6801F609 0RD2002F609 0RD6801F609 0RD0101H609 0RD4702F609 0RD1502...

Page 16: ...R920 R921 R922 R923 SW1101 SW1102 SW1103 SW1104 SW1105 SW1106 SW1801 SW802 FB801 FB802 FB805 FB806 J231 T802 X1 X661 Z102 Z201 P1203A P1206A F801 PA1301 SK901 TH802 TU101 VD801 A1 A2 A3 A4 0RS2002K607 0RD1501H609 0RD1501H609 0RD4701F609 0RD1501H609 0RD1000F609 0RD4300F609 0RS2002K607 140 315A 140 315A 140 315A 140 315A 140 315A 140 315A 140 275B 6600VM1001A 140 275B 125 022K 125 022K 125 123A 125 ...

Page 17: ...Jan 2004 Printed in Korea P NO 3828VD0137R ...

Page 18: ... B3 J509 B4 J510 C4 J511 C4 J512 C5 J513 C5 J514 D5 J515 C3 J601 E1 J602 E1 J603 B2 J604 B2 J605 B2 J606 B2 J607 B2 J608 B2 J609 B2 J610 A3 J611 A3 J612 A2 J613 A2 J614 A2 J615 A2 J616 A2 J617 A2 J618 B2 J619 A3 J620 A4 J621 A4 J622 A4 J623 B4 J624 B4 J625 B4 J626 A4 J627 B4 J628 B4 J629 B4 J630 B4 J631 A3 J632 A4 J633 A2 J634 B2 J635 B2 J636 B2 J637 B2 J661 C2 J662 C1 J663 D3 J664 D3 J665 C2 J666...

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