SERVICE MANUAL
Contents
1. 80078 i INVHOVIG 42018 ANI 9100 OL 0 LNdNI WALSAS OL 56 6 E NI OACIA S Ae 04 5 u3J4ng E 20 0 A OACIA S 6 D NI LOACIA 0 2 O3dIl S Z G mj 7 7 9 dido 2 53579 MS S 220 01 1 1231465 LNdNI 18721 195 WALSAS vas 4 2 13430 NVHOVIG 0078 W31SAS OL Nay anv HD 5 13 29 4 dvul any dV 29 8 D ENGL 7 Ex als 415 e 415 4 HW 169 MVS m SS39Oud TVNDIS 41 LEI aas SEND Vdd NIVIN VNOIS ZZ 73 19 E gt L3120BLIF 1 2 Audio Block Diagram 0078 O3GIAGI OL ANI O LNANI vas 9078 1OH1NOO bon IN31SAS OL AWMION 31nW olanv o H NO d o AS L08N IO 83395 1080 10845 Logar i N LoL 1 5 OIGNV 10821 208 10 208 0 HO 1 H3MV3dS 20845 AN gt2. 60110 1 980130 10S NOLLO3NNOO ON 90078 125 it 00 OL __ 31nwW oranv H NO d 9 108 H3IH3ANOO de 37318 AS AE 283 LOE NY 7 AHOW3W 14121 G 21 01 94 7959 195 5 H3MOd OL ERRORS O LNdNI 21 g 2 e 91 Q1 H NO d lt 42018 1101191908 12 1 rav LHOrmiovag 4 11191708007 OL s et 20119 85019 Nado sna 8 58 E 10018 N 20988 No sz d OL HOSN3S 1 LOLAOH 2115 9 9 LOLX en CQ 5 AJA 11793 e vOLNTO HOLIMS A3M VOLNO Q A NO d 13934 12 19538 ISLO ALOWSY L NFA3 27139 83770811092 AL 22221 4 ____ ____ UE System Control Block Diagram L3120BLS 1 1 IF Video Block Diagram 980139 INVHOVIG 39018 01 OL
3. C XE OX R168 1004 9 169 1004 924 4 9 es mo 4 9 gt lt 3 16 1 T C CVBS gt AVA 22 C uc XEXEX Oo mi O m TUNERCLK 08 X161 11 27972 0161 0162 Tap m amp Wt m CONTINUE LCD MAIN 2 2 SCL SD m N 3 A4 m gt LCD MAIN 2 2 ALt1 5V D CECD 14 2 CLEAR 3V A i CLKV i I E A369 1 saa 101 761 617 6 1 Tot 017 D 0 0 1301 C333 8304 CONTINUE C332 R301 LK1608 A392 T 22K 0301 MAIN 2 2 350P 277 120K T 100 1 5 24 28C4081T 1060 S VIDEO C E 25591887667 CONTINUE 2 1 10100 MAIN 2 2 S VIDEO Y C335 C334 8303 8305 e 7 22K EG 2 _ ee 2 9 L3120SCL1 LCD Main 2 2 Schematic Diagram LCD MAIN 2 2 Hef No Position D V uL EM ICS TO MAIN CBA onore 81 10151 LCD MAIN CBA UNIT d IC171 IC191 cornue Qo une i 192 LCD MAIN
4. 1 N 5 88114 1 410348 HdIN3 3d dm CC c c 009093 WHLOAdS 100 9 dys TAONVO 83173 Tu HO H 135440 uar 4 OOV 730 0 135440 69 7303 4 HoT 138330 91794 Oauais Zp a VO by 99 315 LAdNI 315 55390 71215 0101 dvS SLIN 16821 72 6 419 NI 8 LoOlany 77 4 NI n 7 Lolanv so L3120BLA 1 3 LCD Block Diagram 4 oe Y ____ 97 70 87 O ISWNH et ANIN3A3 wnopr weno Z mm En eh 60 1 15 zt 34340 55 1915 gou 55390984 1915 89 St 2 68 0 86011
5. 30 OCHO CIO DOG OG CJ ED GI d21 5530084 IWNDIS 007 LINN 2 0 7 8 n m TWNOIS VEOLNO INVHOVIG 49018 O3GIAAI OL L3120BLLCD SCHEMATIC DIAGRAMS CBA S AND TEST POINTS Standard Notes Many electrical and mechanical parts in this chassis have special characteristics These characteristics often pass unnoticed and the protection afforded by them cannot necessarily be obtained by using replacement components rated for higher voltage wattage etc Replacement parts that have these special safety characteristics are identified in this manual and its supplements electrical components having such features are identified by the mark A in the schematic diagram and the parts list Before replacing any of these components read the parts list in this manual carefully The use of substitute replacement parts that do not have the same safety characteristics as specified in the parts list may create shock fire or other hazards Notes 1 Do not use the part number shown on these drawings for ordering The correct part number is shown in the parts list and may be slightly different or amended since these drawings were prepared All resista
6. MAIN 2 5 785 7 727722727 77 2 2 OMM 6952 MAIN E TRANSISTOR ZA 2 gt CONTINUE AUDIO1 L IN D e CN113 REG SV 1 ER lt A 10852 TC4052BF EL INPUT SELECT 51 58325 1 N SS 7 R829 8842 22K Lim R830 8843 22K 22K AUDIO SIGNAL PROCESS NOISE FILTER SPECTRAL DE EMPH WIDE BAND 7 WIDE BAND L RT7 RMS DET ms FILTER SWITCH SPECTRAL 2 1 RMS DET FILTER 1 3 CONTINUE MAIN 3 5 INPUT O INV 1 INV TU VIDEO Gol REGt5V 2 MAIN 1 5 C738 40739 REGt5V 2 01 1 100 10V VTt33V 8 9 7 24 032 2541175 3 5 FSC Pe BUS OPEN e R50 0 BUFFER 1K SF 11 SAFHM45M7VAJZO 1803 SAW FILTER C36 4039 C37 47P 842 se R36 qe MAIN 1 5 1 INPUT O D31 155400 M61116FPTFOG process C30 C41 4 1 NO CONNECTION CN113 meom CN113 IS USED T 1 C27 C28 0 0187 0 047 I I 150uH FOR ADJUSTMEN AT FACTORY 2 4 L3120SCM2 Main 3 5 Schematic Diagram MAIN 3 5 VIDEO SIGNAL AUDIO SIGNAL 781 IC801 TRANS
7. 4 5 IC Cee 601 TRANSISTORS A T2 0644 155400 661 i TESTPOINT 5 402 PROTECT 2 CONTINUE AL 6 VT 33V P ON L L3120SCM4 Main 5 5 Schematic Diagram MAIN5 5 oo 0408 25 2785 9 3 SWITCHING Qus AMET aar Qu aca E Qua A08 Bret CN402 Y BACK LIGHT 1 5 BACKLIGHT ADJ PROTECT 1 A C408 0 13 250V T402 INVERTER TRANS AD4 2562231 SWITCHING CN403 3 TESTPONT 0 ero 89 m TP408 zs 2541887 A 25 2785 SWITCHING d en VOLTAGE PROTECTOR 12 8 C 12 1 eee 0 8475 T R476 0 1 10K 0404 2562785 OVER CURRENT PROTECTOR 6 0409 MTZJT 776 2B lt T403 INVERTER TRANS 0452 PROTECTOR CN403 AL 13V 11 LIGHT Pp WOK 9423 2562785 gt BYER VOLTAGE 403 PROTECTOR SWITCHING BACKLIGHT ON 120 0 TCHING 0401 25 2120 0 TANE BACKLIGHT ON 0 1 0 1 0404 8482 2582785 10K OVER VOLTAGE PROTECTOR 32 1 1 0430 155400 L2 8448 0422 9441 1 R440 56 1584004 330 0 71D 48 CIE Q415 25 2231 So R442 SWITCHING 3 3K y Z AA AB AC AL 2 L3120SCM5 Function Schematic Di
8. BACKLIGHT ADJ 5 VOLUME RESET BACKLIGHT SW US OPEN 1 7371 56 520 _______ R372 56 ise A374 ioa eie 0 C373 835 21 i34 R375 56 195 5 5 5 96 i5 53690 C270 LC271 gt pe 06 2 06 1 06 0 GND 0905 0914 0903 0902 0711 BRE 1 E H138 0 E H139 0 0 265 R160 100 C157 1 3 324 3 H141 100 C132 0 01 3 325 1 E R131 M H144 0 3 345 2 RIS6 0 0 154 i zz gt 2 in 2 2 D 3 D 3 D 3 3V 34 34 Ww lt OTe Tol reo ere NO CONNECTION CN105 ALTSV 1 GND 2 3 REMOTE 3 P ON H 4 NO CONNECTION 03111 77 1 NENNEN gt 5 O s NEM 17 7 PART MOUNTED NENNEN SD A MUTE 83510 26 84 R G B E lt 0 2 R352 0 VIDEO SIGNAL 41 8390 Blood do NI 731 0 Wd 00 00 01 o olo lt 0101 41 2 GND LEAR PROCESS 21 FOR CN111 EM SEL EJECT LCD MAIN 2 2
9. LIQUID 1FSA10070 CRYSTAL PANEL UNIT X X3 1EMN20510A NE903UD A ho MMA CBA MAIN CBA CHIP CERAMIC CAP CH J 11pF 50V CHIP CERAMIC 1608 J 68pF 50V CHIP CERAMIC 1608 CH J 68pF 50V CHIP ELECTROLYTIC CAP 47uF 10V PQ1LAX95MSPQ VOLTAGE REGULATOR LD1117SC R R8A01014A92FP 1ESA11081 CHD1JJ3CH110 CHD1JJ3CH680 CHD1JJ3CH680 CA1A470SP062 QD1BOOEDZAR7 D701 QSZBAOTSH053 NSZBAOTSS229 QSZAAORHTO70 K706 K707 K708 K709 K710 E NEN NU Do 5 1 RefNo Description are wous SSS Ro mas Ri Rib Ri moua CHIP RES 1608 1 10W J 10kQ CHIP RES 1608 1 10W J 100 Q CHIP RES 1608 1 10W F 240 Q CHIP RES 1608 1 10W J 1kQ o Rr4 Bras nouse Rr nouse Rr Rr nouse Ro ouse Rua Ras Ba ouse Rar ousa O oo ousa O oo Raos ouse O ooo o o r6 Rr nousa Ro RE wy o Noued Notused _ L3120PL WF15L5 L3120UL 2005 06 25
10. SC Main 1 5 Schematic Diagram MAIN 1 5 MAIN TO LCD MAIN Cen oss d Ars LP io wo fa 3 5 7V REGULATOR 1 1 1 1 1 0502 25 157 106 CONTROL caa 330 50V S SW gt 25 2120 0 0504 CBA UNIT 1554004 LCD CN102B CN102A 0505 CONTINUE 25 2120 0 3 5 22745 0 5 w s 77 EN EcL INPUT 0 CONTINUE 0 12 10533 88 MAIN 3 5 Ep TIE 45V REGULATOR 7717 P ON H D520 1120504 0507 MTZJT 776 2B IC672 D672 KIA7805API 155400 5V REGULATOR E sees ps LI 1 SELL ae 77 5 5 IGHT ADJ 1 C539 100P CONTINUE eral Ws E POE 0513 SWITCHING CONTINUE 207 eae 5 5 0510 2 7981108099 VT 33V PANEL 13 3v 5 KIA7805API 45V REGULATOR 8545 0515 22K 0 0512 25 2120 0 P ON ON oN E MAIN 4 5 77 777 LL 77072 P ON L 4 MEN DE MAIN 2 5 D668 8664 155400 0 0633 eSC4081T106G INVERTER 2 3 L3120SCM1 Main 2 5 Schematic Diagram
11. _____ 1 2 O3QI S MSS 21 L MSS 98 210 1044 91 8 2101044 on 8 5 _____ 10310844 81 6 11031094 20845 _____ vi _____ 20 21 O LNdNI LALS AN lezl AN 31nW olanv 1 3117110100 30 8 01NO llli 5010 ZH NO d 0 lyk CH NO d LL AN ejas ____ anmo 6 Si ____ amp 9 O33 9 2 18 A9 13Nvd 91 H NO d ono 83345 6 AGZ TANVd AGZ TANVd AN 4 AN L08dS 8 QNO 9 1 DN ______ L08NO LION s 5 6 61 5 11191790 8 9 APEFINVd 9 7 02 S N ae ee ae l av LHOIMOVa INOO 8 12 AN QNO 2 NOO A fN 6 _____ AN 1 ZJN ____ 910139 VLOLNO VZOLNO 8201 0 HONO ZLENO vao 01 L3120WI 4 1 Different parts from the original model 6615LF4 HetNo Description Patno MECHANICAL PARTS ho howa SY AGA RATINGLABELLSIZUL 6 LABEL EAS H3761UD MAKER NO ZLLFNSLE 1 OWNERS MANUAL L3120UL REMOCON UNIT 170 ECNLC301 NE903UD ELECTRICAL PARTS LCD MAIN CBA amp
12. 1 2 5 H n 10193 268 1 IC201 h 5177 b I opo TRANSISTORS 4 0131 ge COWECTION Q201 H CONNECTORS a musco ee 100 NO PART MOUNTED CN312 C156 2185 For 011 0153 tee CN101B NL MAIN 1 75 io TO LCD MODULE Ev R184 81852 8188 4 7K V COM 1 0171 6 006 25 ins ues 117 C174 6179 5 1 4 9 4 9 Tae 3 DLE Du ZO 70471 8 1 R24 F W afew wees CONTINUE 80818 21 57 12575 att a FI T M 15 7 3 REGULATOR per s Tact avial 9 Hepa 2655 TEES gg wf 1 70 557 E one PQ4LAXS5MSPQ p 53 34 REGUL ATORI ICE f ester 7 7 1 EED 1 dis si LCD MAIN 1 2 CARE 4176 av 1 IC201 E 4 4 SHIICHING lt NEGON EG 5 DX RS ae NND Ceo MAIN 472 p FE 6815 2 10 L3120SCL2 WAVEFORMS WF1 WF9 Waveforms to be observed at Waveform check points Shown in Schematic Diagram Input NTSC Color Bar Signal with 1kHz Audio Signal WF1 1DIV 1 0V 10us 964 1DIV 1 0V 10 5 WF7 1DIV 200mV 20
13. 11 R392 R201 Pin 11 of CN103A Bough See pees ORTA S od eot WF2 1DIV 1 0V 20ns WF5 1DIV 1 0V 10115 WF8 1DIV 200mV 20us H365 H394 Pin 9 of CN103A AUDIO S VIDEO C WF3 1DIV 1 0V 20us WF6 1DIV 100mV 400us WF9 1DIV 200mV 20us H202 Pin 14 of IC801 Pin 7 of CN103A 3 4 L3120WF WIRING DIAGRAM 9 NI d NI NI LNO 91 10101 10100 LO3GIA amp f 31019 Eg E wle auo mE T 15 2 6 93 9v p o3 a teenaan 603 EIER _ 68 77 QNO VOLNO vOLNTO Mee 59997 za 065 ____ H ec 20 9 82 9 83 SESS SA 051 76 8 01 ESSERE eel Teor vaan YES on _ ____ IR Wm 340558 N3dO sna NOLLO3NNOO ON L INO 98 83880 01110 E LINE ______ Sd V AE mm V AE 1V 772 ast I T QNO 02 AOSdWS 6 AO3OIAS vas 61 s
14. ISTORS 946 Te MAIN 2 5 4 52801 ra SPEAKER Js wo a C716 2 2 10V Zi MAIN 2 5 ES S a e EE eS ne JK801 HEADPHONE JACK LB 1 5 CLNBO2 CN802 geo 3 7 E L CH 18 MAIN 1 5 VOLUME Ee ccc SL LL H806 dere pe 1 4081T106G BUFFER 0 1C781 TC4053BF EL 1 INPUT SELECTI 4 9 C787 0 017 2 4 os MAIN 1 5 C711 e 7 0 0703 AL 3 2SC4081T 1060 D535 BUFFER MTZJT773 9B TO LCD MAIN JK704 CBA UNIT AUDIO4 L CN103B CN103A JS813 IN 3 104 AUD do CONTINUE S VIDEO C 7 17812 25 4081 1060 1 5 48 aa EA AUDIO MUTE CVBS INVERTER z 2 2 2 t 110 110 1 11 1 10 01 4 elo POWER NU 5 ws 9 gt SWITCHING ALT7N D P ON OFF FSC NDS MAIN 2 5 FS BUS OPEN 2 5 REGt5V 1 4 L3120SCM3 Main 4 5 Schematic Diagram CAUTION Fixed voltage or Auto voltage selectable power supply ci
15. Main Fuse F601 is blown first check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail 3 Note 1 Do not use the part number shown on the drawings for ordering The correct part number is shown in the parts list and may be slightly different or amended since the drawings were prepared 2 To maintain original function and reliability of repaired units use only original replacement parts which are listed with their part numbers in the parts list section of the service manual 4 Voltage indications on the schematics are as shown below Plug the TV power cord into a standard AC outlet Unit Volt 5 0 5 0 Power on mode 0 3 0 Power off mode Voltage Indicates that the voltage is not consistent here 5 How to read converged lines 1 D3 Distinction Area Line Number 1 to 3 digits Examples 1 71 03 means that line number 1 goes to the line number 1 of the area D3 2 1 1 means that line number 1 goes to the line number 1 of the area 6 Test Point Information D Indicates a test point with a jumper wire across a hole in the PCB gt Used to indicate a test point with a component lead on foil side e Used to indicate a test point with no test pin Used to indicate a test point with a test pin 2 2 LC2N
16. R 1 181 4776 efje ele 5 5 5 2 5 RBA01014AS2FP BACKLIGHT SW 4 LCD DRIVE GND BACKLIGHT ADJ GND NU LCD SIGNAL PROCESS 49 D4 TV MICRO CONTROLLER 48724 HMS1 E C382 C383 e 0 1 0 1 on gt 3 gs 092 co 2 2 GIIS 2 eio z 2 C229 C230 2 oja 2 PT 20 EE e ua m WT 4 1 384 56 1416 9385 56 pROTECT 2 cn 7 EAE PROTECT 3 R G B R L ____________ 8386 96 44 D4 0814 ODD C237 C238 Ce239 98 682 Teer gt R362 0 17 0 3 e 1 R363 1K 18 0812 gt TO FUNCTION CBA CLN104 LCD RGB SIGNAL PROCESS TIN 1 REMOTE LPF KEY IN LCD DRIVE CIRCUIT RUE C374 0 1 9011 KEY IN 1 8 0 vss e 5 0810 ALt3 V COM VDD33 21 GND vss 3 28 GE s Pb Cb Pr Cr R G B Y EE 56 cim p E UO R388 56 REMOTE P ON He 4 51 2 06
17. UPPLEMENT SERVICE MANUAL This service manual shows only the differences between the model WF15L5 and the original model 6615LF4 All other information is described in the service manual of the model 6615LF4 5 COLORLCD TELEVISION 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000 00000000000000 3 0000000000000000000000000000000000000000000000000000000000000000 0000000000000000 000000000000000 C 90 9000000 00000000000000 0000000000000 6000000000000 6000000000000 000000000000 000000000000 0000000000 00000000 000000000 00000000 0000000 0000 TABLE OF CONTENTS Block Diagrams Schematic Diagrams CBA s and Test Points Wiring Diagram Different parts from the original model 6615LF4 HANANI 11 AHOLOWS LV AN INAWLSNrav HOS 3 LINN 097 521 7 1HVd ON NOLLO3NNOO LINO nao 0831
18. agram FUNCTION CBA CBA UNIT CN104 KEY IN 2 LCD MAIN SW105 SKQSAB VOL DOWN INPUT SELECT 101 91477121112 IR SENSOR 0909 L3120SCF LCD Main 1 2 Schematic Diagram LCD MAIN 1 2 VIDEO SIGNAL TRANSISTOR 7 2 RRR amp 9 9 o 2 9 9 0 2 9 2 04241 NO CONNECTION CN102B 1 bb 1010 EL 5 lib ld 11117171717 0301 GND 1 8 9 917 15151711709 97512 1 1171171 111171 T 28798 712 CONNECTORS ____ 0 WF5 9119 e to 2 o o o o o B225 ui o C210 LAL LOL LOL LOL LOL 10 C216 19 OL LOL 10 3 TUE R236 FRF AA PF 3 22239 2 CN104 8 8888 go 58585 8 A S NR iN m CN105 R237 3 1 eem cm a CN211 PANELT3 3V CN311 1 F4 CN1028 Dess 7203 0 7204 0 Ree4 410 7227 v 2 PROTECT 1 AFT IN 1 INPUT 1 11 1 AUDIO MUTE 1 P ON H2 VOLUME P ON H 1 Raag C221 68P y gt gt CN311 TO LCD MODULE 5 w 2 4 793 ex Sar E
19. nce values are indicated in ohms K 10 M 10 Resistor wattages are 1 4W or 1 6W unless otherwise specified All capacitance values are indicated in uF P 109 111 All voltages are DC voltages unless otherwise specified 9r 2 Note of Capacitors ML Mylar Cap Metallized Film Cap SC Semiconductor Cap L Low Leakage type Temperature Characteristics of Capacitors are noted with the following 10 0 60 ppm C CSL 350 1000 ppm C Tolerance of Capacitors are noted with the following Z 80 20 Note of Resistors CEM Cement Res MTL Metal Res Fuse Res Capacitors and transistors are represented by the following symbols CBA Symbols Top View Bottom View Digital Transistor Electrolytic Capacitor e Bottom View m 2 Transistor or Digital Transistor Schematic Diagram Symbols Qp Top View Top View NPN Transistor PNP Transistor ECB ECB Top View Top View NPN Digital Transistor PNP Digital Transistor ECB ECB 2 1 LC2N SC LIST OF CAUTION NOTES AND SYMBOLS USED IN THE SCHEMATIC DIAGRAMS ON THE FOLLOWING PAGES 1 CAUTION CAUTION FOR CONTINUED PROTECTION AGAINST RISK OF FIRE REPLACE ONLY WITH SAME TYPE A V FUSE ATTENTION UTILISER UN FUSIBLE DE RECHANGE DE M ME TYPE DE A V 2 CAUTION Fixed Voltage or Auto voltage selectable power supply circuit is used in this unit If
20. rcuit is used in this unit If Main Fuse F601 is blown check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply Otherwise it may cause some components in the power supply circuit to fail C610 C654 100 t 100 eo eoo WIRE A D 137 8 0601 60 0659 25 3869 WIRE SWITCHIN6 S 5 7 C608 1000P 2KV R621 0609 820 207 775 68 5 D624 77338 C660 R622 WIRE 6800P MTZJT C63 T 3837 295 90635 D630 J5633 WIRE ERC84 009 mE iS POWER TRANS 45632 80534 2528 WIRE ERC84 009 C534 R634 63 68K P52501 1W ERROR VOLTAGE DET 14 4 CAUTION For continued protection against risk of fire replace only with same type 4 A 125V fuse 4A 125V N ATTENTION Utiliser un fusible de rechange de m me type de 4A 125V MAIN CBA R642 D647 D648 27K MTZJT 7739B 44155200 ac ERC81 004 gt 0633 8636 1 004 WIRE L C642 10 50V 80636 0645 BEAD FR154 gt A A 19 53 0845 D636 155133 7 0649 0 AKTAA31 AT fear 2 6 MATN 1 5 ALt 40V AL BV 12V NOTE The voltage for parts in hot circuit is measured using hot GND as a common terminal MAIN
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