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XOCECO LET2751 Service Manual

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COLOR TELEVISION
LET2751
(TS2751)

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Summary of Contents for XOCECO LET2751

  • Page 1 COLOR TELEVISION LET2751 (TS2751)

  • Page 2: Table Of Contents

    CONTENTS Safety Precautions………………………………………………………………………..…… Alignment instruction. ………………………………….…………………………….……. Debugging instruction …………………………………………….…………………………. Block diagram ……………………………..…..…..…..…..…..…….………….…………… IC Block diagram……………………..……………………….……………………………… Wiring diagram……………………………………………………………………………..… Exploded view………..…..…..…..…..…..…..…..…..…..…..…..…..…..…..…..…..…..…... Part list ………………………………………………………..……………......Schematic diagram …………………………………………………………………….……..

  • Page 3: Safety Precautions

    Note:This service manual is only for professional service personnel’s reference. Before servicing the unit, please read the following items carefully. 1. SAFETY INSTRUCTION AND GENERAL INSTRUCTION Before servicing and aligning this equipment, please read the following “X-RAY RADIATION PRECAUTION” , “SAFETY PRECAUTION” and “PRODUCT SAFETY NOTICE”. 1.1 X-RAY RADIATION PRECAUTION 1）...

  • Page 4: Alignment Instruction

    characteristics are often passed unnoticed by a visual inspection and the X-RAY RADIATION protection afforded by them cannot necessarily be obtained by using replacement components rated for higher wattage, etc. Replacement parts which have these special safety characteristics are identified in this manual and its supplement electrical components having such features are shaded on the schematic diagram and the parts list.

  • Page 5: Debugging Instruction

    3.2 OSCILLOGRAPH 3.3 HIGH-VOLTAMETER 3.4 DIGITAL MULTIMETER 3.5 AC ATTACK PULL TEST EQUIPMENT 3.6 SCAN frequency signal generator BT-3 4 Debugging instruction 4.1 enter into the factory debugging menu use to the remote control(RC-A23),follow to the blow model enter into the factory: DISPLAY →...
  • Page 6 4.7 Use white balancer to rectify the white balance under following conditions color temperature:12000K+8MPCD x =0.270± 0.008 Y=0.283±0.008; dark space: 4.5nit, bright space: 60nit Note:1. While the colour saturation changed from maximum to minimum, if the dark balance appears changeable,adjust RY.TV and BY.TV (P12) to let it coincide with white balance. 2.
  • Page 7 4.16 the factory menu adjustment model pre-set item Pre-set model P1-60 V SIZE 60HZ field amplitude V SHIFT 60HZ field center H-PHASE 60HZ H-center V LINE 60HZ V-line V SC 60HZ field S-correct V COMP field amplitude compensate fixed L.BLK Left blanking fixed R.BLK...
  • Page 8 SUB-COL Sub-colour fixed SUB-SHP Sub-definition fixed SUB-TINT Sub-tint fixed VOL.FIL Volume control ADC filter fixed OSD.COT OSD contrast fixed OSD.HPOS OSD center fixed Line AFC loop gain and sync fixed gate switch VIF SW IF3=45.75MHZ fixed SIF SW Sound IF0=4.5MHZ fixed VIDEO LEVEL VIDEO LEVEL...
  • Page 9 FBP BLK SW Horizontal blanking switch fixed,0=inside produce;1=FBP and inside logic “and” DC REST DC recover rate fixed,0=100% 1=107% Field frequency division CD.MODE fixed,0=auto model CORE GAIN Noise reduction fixed,0=OFF 1=MIN 3=MAX γ.GAMA r-correct fixed,0=OFF RGB DC output RGB TEMP.SW fixed temperature speciality A.MONI SW...
  • Page 10 AV selection AV input select(3=AV1/AV2/S/DVD) MTS IC selection 0=nothing,1=72700 2=AN5832 V.OFF.MOTE Turn off model 0=discharge,1=close PWR.MEM Turn on model 0=standby,1=auto turn on,2=memory 1115 select LV1115 fixed,0=nothing;1=have No signal background BLCK GROND 0=nothing 1/3=blue background;2=black background selection South America and North N/PN 0=south america;1=north america America selection...

  • Page 11: Block Diagram

    BLOCK DIAGRAM...

  • Page 12: Ic Block Diagram

    MAIN IC LA76930 BLOCK DIAGRAM...
  • Page 13 Function introduction to pin function Reference function Reference voltage voltage SIF output 2.28 PIF input1 2.86 PIF AGC 2.61 PIF input 2 2.86 SIF input 3.11 IF GND FM filter 2.64 RF AGC output 4.55 FM filter/sound output 2.25 Video output 2.30 Sound output 2.24...
  • Page 14 POWER H=OFF 5.00 L=ON Turn voltage 1.73 5.00 output Mute, high 5.00 Level availability I2C DATA 5.00 x T2 4.50 I2C CLOCK 5.00 x T1 2.70 AN7522 Pins function function function power GND input CH1+ output CH2 input volume CH1- output CH1+ output Stand-by GND (CH2 output)
  • Page 15 FSCQ1265RT...

  • Page 16: Wiring Diagram

    WIRING DIAGRAM...

  • Page 17: Exploded View

    EXPLODED VIEW...
  • Page 18 TS2751 DESCRIPTION PART# BACK CABINET 780-10908-040 REAR PANEL 808-1M650-040 MAIN BOARD FRAME 863-6A127U000H WASHER 868-10107-00 CRT SUPPORT 868-20175-00 POWER SWITCH/STANDBY 360-30028-00/667-TS32351-05 BUTTON BOARD FRONT CABINET 611-E50Y3J0H1C SIDE AV BOARD 667-TS2950-29 SPEAKER ST613-04 384-32108-50 TOUCH BUTTON 877-60595-00 BUTTON CAP 877-60531-00 BUTTON CAP (PLATING) 877-60530-01 WASHER 868-20217-00...

  • Page 19: Part List

    PART LIST PART# DESCRIPTION LOCA.NO. 100-TS27510-11 LET2751 100-TS27510-01 TS2751 100-U29F0-01FD ASSEMBLY ACCESSORY RATION U,V,29F6 BOARD 123-30001-04 TWIST WIRE 335-2942L-00 CRT A68QCP693X001 477-12904-00 DEGAUSS COIL DX-29! 488-10012-00 BATTERY 7＃( made in china 604-TS27517-00 OWNER'S MANUAL(LEGEND) 611-E51R3-0H1D FRONT CABINET ASS'Y 615-10079-00 CRT FIXER ASS'Y...
  • Page 20 RUBBER WASHER 868-20452-00 CUSHION 868-20462-00A CRT SUPPORT 868-20529-00 CRT SUPPORT 868-20553-00 CABINET BOTTOM CUSHION 880-10205-A57 BACK PLATE (LET2751,LEGEND) 880-10777-A1 FRONT LOGO LEGEND SILVERY GREY 10C29" 881-60085 BLANK WARNING LABEL 881-80672-00 SERVICE CARD ( 27-32 CRT) 881-TS27517-00 OPERATION CARD (LEGEND) 886-31150-30...
  • Page 21 364-3E123-00 40-PINS CONNECTORS L40P XS01 459-2410R-00 CERAMIC CAPACITOR DD308-63F104Z50 CS04 459-2410R-00 CERAMIC CAPACITOR DD308-63F104Z50 CS06 459-2410R-00 CERAMIC CAPACITOR DD308-63F104Z50 CS10 459-2410R-00 CERAMIC CAPACITOR DD308-63F104Z50 CS21 462-B0322-H02 POLYESTER CAPACITOR CL21X-50V-0.022uF-J CS05 462-B0333-H02 POLYESTER CAPACITOR CL21X-50V-0.033uF CS07 462-B0422-H02 POLYESTER CAPACITOR CL21X-50V-0.22uF-J CS11 464-60433-M0 ELECTROLYTIC CAPACITOR CD110-50V-0.33uF-M CS02...
  • Page 22 467-1C224-H0 CARBON RESISTOR 1/6W-2.4K-J R407 467-1C224-H0 CARBON RESISTOR 1/6W-2.4K-J R408 467-1C224-H0 CARBON RESISTOR 1/6W-2.4K-J R409 655-41201-240 X302 ( 4-PINS） LEAD WITH HOUSING 459-8222K-00 CERAMIC CAPACITOR DE1005B222K2K C407 464-6D722-M0 ELECTROLYTIC CAPACITOR CD110-16V-220uF-M C411 464-65610-M0 ELECTROLYTIC CAPACITOR CD288-250V-10uF-M C409 655-61201-173 X401 ( 6-PINS） LEAD WITH HOUSING 467-1C110-H0 CARBON RESISTOR 1/6W-100Ω-J R401...
  • Page 23 667-TSX51-01A\ MAIN PCB ASS'Y (MANUAL INSERTION ） JUMPER WIRE JUMPER WIRE L303 JUMPER WIRE L502 JUMPER WIRE N703 JUMPER WIRE V702(BC) JUMPER WIRE X301 JUMPER WIRE JUMPER WIRE 329-33204-00 CRYSTAL 32.768K G201 329-54401-00 CRYSTAL JA18 4.433619MHZ G202 340-00079-00 DIODE FR103 VD304 340-00079-00 DIODE FR103...
  • Page 24 364-99208-00 AV JACK AV901-5 XS601 457-12003-90U RELAY JQX-115F-012-1H1 ! RL01 458-07009-00 SAW FILTER M1859M Z201 459-6147K-00 CERAMIC CAPACITOR DE0705B471K1k C514 459-6210K-00 CERAMIC CAPACITOR DE0705B102K1K C503 459-6210K-00 CERAMIC CAPACITOR DE0705B102K1K C504 459-6210K-00 CERAMIC CAPACITOR DE0705B102K1K C505 459-6210K-00 CERAMIC CAPACITOR DE0705B102K1K C506 459-6210K-00 CERAMIC CAPACITOR DE0705B102K1K C508...
  • Page 25 467-8E422-H0 SOLID RESISTOR 1/2W-220KΩ-JL ! R504 467-8E522-H0A SOLID RESISTOR 1/2W-2.2M-J R501 467-8E582-H0A SOLID RESISTOR 1/2W-8.2MΩ-J R509 468-33207-00 POTENTIOMETER EVND8A-20K VR501 469-10023-00 THERMISTOR 96708 (9Ω) RT501 469-40004-00 THERMISTOR 5D2-14LC R502 470-00376-00U *SWITCHING TRANSFORMERSD4929A T501 471-2056H-60 PEAKING COIL LGA0307-56uH-J L601 472-10001-00 HORIZONTAL DRIVE TRANSFORMER XR0961 T302 472-27148-00 FBT BSC29-3988N A !
  • Page 26 851-24014-31 SCREW SJ2824 ST4X14C-D.Zn 851-24014-31 SCREW SJ2824 ST4X14C-D.Zn 851-53010-31 SCREW SJ2825 ST3X10FT-D.Zn 851-53010-31 SCREW SJ2825 ST3X10FT-D.Zn 851-53012-31 SCREW SJ2825ST3X12FT-DZn 851-53016-31 SCREW ST2825 ST3X16FT-D.Zn 852-13008-81 SCREW P(+) M3X8-D.Zn N505 852-13008-81 SCREW P(+) M3X8-D.Zn V306 863-6A127U000H MAIN FRAME (HIPS V0) 870-20690-U00A FBT BRACKET (HIPS V0) 881-60074-00 HIGH VOLTAGE WARNING LABEL 893-10300-11...
  • Page 27 JUMPER WIRE J221 JUMPER WIRE J222 JUMPER WIRE J223 JUMPER WIRE J224 JUMPER WIRE J225 JUMPER WIRE J226 JUMPER WIRE J227 JUMPER WIRE J228 JUMPER WIRE J229 JUMPER WIRE J230 JUMPER WIRE J231 JUMPER WIRE J231 JUMPER WIRE J232 JUMPER WIRE J233 JUMPER WIRE J234...
  • Page 28 JUMPER WIRE J519 JUMPER WIRE J521 JUMPER WIRE J601 JUMPER WIRE J602 JUMPER WIRE J603 JUMPER WIRE J604 JUMPER WIRE J605 JUMPER WIRE J701 JUMPER WIRE J702 JUMPER WIRE J703 JUMPER WIRE J704 JUMPER WIRE J705 JUMPER WIRE J706 JUMPER WIRE J708 JUMPER WIRE J709...
  • Page 29 343-18150-104 TRANSISTOR 2SC1815-Y V303 343-18150-104 TRANSISTOR 2SC1815-Y V305 343-18150-104 TRANSISTOR 2SC1815-Y V503 343-18150-104 TRANSISTOR 2SC1815-Y V505 343-18150-104 TRANSISTOR 2SC1815-Y V506 343-18150-104 TRANSISTOR 2SC1815-Y V507 343-18150-104 TRANSISTOR 2SC1815-Y V703 343-18150-104 TRANSISTOR 2SC1815-Y V704 343-23830-604 *TRANSISTOR 2SC2383-0 V301 343-27170-004 TRANSISTOR 2SC2717 V101 459-2015H-102 CERAMIC CAPACITOR CC45-CH1H150JYR C201...
  • Page 30 462-00315-H02 POLYESTER CAPACITOR CL11-100V-0.015uF-J C205 462-00315-H02 POLYESTER CAPACITOR CL11-100V-0.015uF-J C216 462-00322-H02 POLYESTER CAPACITOR CL11-100V-0.022uF-J C510 462-00333-H02 POLYESTER CAPACITOR CL11-100V-0.033uF-J C222 462-00347-K02 POLYESTER CAPACITOR CL11-100V-0.047uF-K C512 462-00410-K02 POLYESTER CAPACITOR CL11-100V-0.1uF-K C326 462-00410-K02 POLYESTER CAPACITOR CL11-100V-0.1uF-K C328 462-B0410-H02 POLYESTER CAPACITOR CL21X-50V-0.1uF-J C527 462-B0447-H02 POLYESTER CAPACITOR CL21X-50V-0.47uF-J C214...
  • Page 31 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C612 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C613 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C732 464-6D610-M02 ELECTROLYTIC CAPACITOR CD110-16V-10uF-M C733 464-6D622-M02 ELECTROLYTIC CAPACITOR CD110-16V-22uF-M C211 464-6D647-M02 ELECTROLYTIC CAPACITOR CD110-16V-47uF-M C212 464-6D647-M02 ELECTROLYTIC CAPACITOR CD110-16V-47uF-M C522 464-6D710-M02 ELECTROLYTIC CAPACITOR CD110-16V-100uF-M C314 464-6D710-M02 ELECTROLYTIC CAPACITOR CD110-16V-100uF-M C322...
  • Page 32 467-1C156-H03 CARBON RESISTOR 1/6W-560Ω-J R235 467-1C156-H03 CARBON RESISTOR 1/6W-560Ω-J R239 467-1C156-H03 CARBON RESISTOR 1/6W-560Ω-J R240 467-1C168-H03 CARBON RESISTOR 1/6W-680Ω-J R506 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R305 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R347 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R350 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R351 467-1C210-H03 CARBON RESISTOR 1/6W-1K-J R508...
  • Page 33 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R204 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R206 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R221 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R236 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R325 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R329 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R514 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R515 467-1C310-H03 CARBON RESISTOR 1/6W-10K-J R521...
  • Page 34 467-2D282-G03 METAL RESISTOR 1/4W-8.2K-G R311 467-2D356-H03 METAL RESISTOR 1/4W-56K-J R513 467-2D418-H03 METAL RESISTOR 1/4W-180K-J R512 471-2022K-003 PEAKING COIL SPT0305-220K-5 L201 471-2022K-003 PEAKING COIL SPT0305-220K-5 L202 471-2027K-003 PEAKING COIL SPT0305-270K-5 L203 471-2027K-003 PEAKING COIL SPT0305-270K-5 L204 471-2068K-103 PEAKING COIL LGA0410-68uH-K L102 471-2B68K-003 PEAKING COIL SPT0305-R68K-5 L101...
  • Page 35 667-TS2950-05 KEY BOARD ASS'Y 467-1C210-H0 CARBON RESISTOR 1/6W-1K-J R902 467-1C222-H0 CARBON RESISTOR 1/6W-2.2K-J R903 467-1C233-H0 CARBON RESISTOR 1/6W-3.3K-J R904 467-1C247-H0 CARBON RESISTOR 1/6W-4.7K-J R905 467-1C282-H0 CARBON RESISTOR 1/6W-8.2K-J R906 467-1C312-H0 CARBON RESISTOR 1/6W-12K-J R909 467-1C420-H0 CARBON RESISTOR 1/6W-200K-J R907 360-10001-00 TACT SWITCH KFC-A06-4X4.5X5B S901 360-10001-00...
  • Page 36 *454-03647-MB SMD ELECTROLYTIC CAPACITOR CDPS-10V-47uF-M *454-03647-MB SMD ELECTROLYTIC CAPACITOR CDPS-10V-47uF-M *454-03647-MB SMD ELECTROLYTIC CAPACITOR CDPS-10V-47uF-M *454-03647-MB SMD ELECTROLYTIC CAPACITOR CDPS-10V-47uF-M *454-04622-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-22uF-M *454-04622-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-22uF-M *454-04622-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-22uF-M *454-04622-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-22uF-M *454-04622-MA SMD ELECTROLYTIC CAPACITOR CDPS-16V-22uF-M *454-06722-ME...
  • Page 37 *455-12210-F0 SMD RESISTOR FTM06031001FR *455-12210-F0 SMD RESISTOR FTM06031001FR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12222-H0 SMD RESISTOR FTR0603222JR *455-12310-H0 SMD RESISTOR FTR0603103JR *455-12310-H0 SMD RESISTOR FTR0603103JR *455-12310-H0 SMD RESISTOR FTR0603103JR *455-12310-H0...
  • Page 38 *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1 SMD CAPACITOR 06032E104M250BA *456-2410M-C1...
  • Page 39 *456-3210H-11 SMD CAPACITOR 0603CG102J500BA *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-12A18-K0 SMD COIL SGMI2012-1R8KT *474-25022-K0 SMD COIL NLC453232T-220K *474-25022-K0 SMD COIL NLC453232T-220K *474-25022-K0...
  • Page 40 342-08570-40 SMD TRANSISTOR BC857B VA21 342-08570-40 SMD TRANSISTOR BC857B VA22 353-32570-10 SMD ICSN74CBT3257CDR NA02 353-20890-80 SMD ICCXA2089Q NA01 353-40520-80 SMD IC HEF4052BT NA04 455-22000-H0 SMD RESISTOR RC11-1/8W-0-J CA118 455-22075-H0 SMD RESISTOR RC11-1/8W-75-J RA68 455-22075-H0 SMD RESISTOR RC11-1/8W-75-J RA65 455-22075-H0 SMD RESISTOR RC11-1/8W-75-J RA60 455-22075-H0 SMD RESISTOR RC11-1/8W-75-J...
  • Page 41 455-22156-H0 SMD RESISTOR RC11-1/8W-560-J RA63 455-22156-H0 SMD RESISTOR RC11-1/8W-560-J RA53 455-22156-H0 SMD RESISTOR RC11-1/8W-560-J RA59 455-22156-H0 SMD RESISTOR RC11-1/8W-560-J RA50 455-22210-H0 SMD RESISTOR RC11-1/8W-1K-J RA46 455-22210-H0 SMD RESISTOR RC11-1/8W-1K-J RA47 455-22210-H0 SMD RESISTOR RC11-1/8W-1K-J RA15 455-22210-H0 SMD RESISTOR RC11-1/8W-1K-J RA13 455-22210-H0 SMD RESISTOR RC11-1/8W-1K-J RA20...
  • Page 42 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA05 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA34 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA43 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA42 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA39 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA38 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA45 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA44 455-22410-H0 SMD RESISTOR RC11-1/8W-100K-J RA95...
  • Page 43 456-3001C-12 SMD CAPACITOR C2012CH1H010CT CA107 456-3001C-12 SMD CAPACITOR C2012CH1H010CT CA106 456-3056H-12 SMD CAPACITOR C2012CH1H560JT CA104 456-3122H-12 SMD CAPACITOR C2012CH1H221JT CA63 456-3147H-12 SMD CAPACITOR C2012CH1H471JT CA62 456-3147H-12 SMD CAPACITOR C2012CH1H471JT CA103 456-3210H-12 SMD CAPACITOR C2012CH1H102JT CA93 456-3210H-12 SMD CAPACITOR C2012CH1H102JT CA92 456-3210H-12 SMD CAPACITOR C2012CH1H102JT CA01...
  • Page 44 XS604 XS601 PIN6 G V G R L XS602 C741 C742 C743 C744 C601 C606 C604 R601 100p 100p 100p 100p 0.01uF 10u/16A 10u/16v R616 AN7522 N701 L601 4.7K 56uH R607 R608 R744 R743 R604 R606 R610 R615 100K 100K R602 R603 C610...

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Ts2751