XOCECO LET2053, Service Manual

Page 1: ...COLOR TELEVISION TS2053 LET2053...

Page 2: ...CONTENTS Safety Precautions Alignment instruction Debugging instruction IC Block diagram Function introduction to pin Wiring diagram Exploded view Part list Schematic diagram 1 2 3 9 10 15 16 18 34...

Page 3: ...elow 1 2 SAFETY PRECAUTION WARNING Service should not be attempted by anyone unfamiliar with the necessary precaution on this receiver The following are the necessary precautions to be observed before...

Page 4: ...placing any of these components read the parts list in this manual carefully The use of substitute replacement parts which do not have the same characteristics as specified in the parts list may creat...

Page 5: ...or 2 if V2 3 5V then the voltage is 1 or 2 after adjustment the picture should not appear no sync distortion and moire White balance and screen grid voltage VG2 adjustment After enter PAGE3 of factory...

Page 6: ...BY DC and YUV RY DC PAGE4 to let it conincide with white balance 4 7 High voltage and filament voltage check Connect a high voltage meter between anode cap of picture tube and the ground measure the...

Page 7: ...5 2 H PHASE 50HZ H center 6 4 5 2 V LINE 50HZ V line 13 4 5 2 V SC 50HZ field S correct 10 4 5 2 P5 LINE Level bright line 0 0 normal 1 Level bright line RB Red cut off 100 4 4 GB Green cut off 100 4...

Page 8: ...C PRE ADJ Pre shoot 3 fixed 0 narrow 3 width OVER ADJ overshoot 3 Fixed a 0 narrow 3 width C VCO ADJ Color VCO frequency adjustment 4 fixed 0 4 7 120KHZ 0 90KHZ P10 BRT ABL DEF Brightness ABL 0 fixed...

Page 9: ...tic level 5 fixed 0 30dB 3 40dB VCO FREQ VCO frequency 32 fixed P14 Y GAIN 0 fixed Y TH 0 fixed B OFFSET 0 fixed B WIDTH 0 fixed C OFFSET 0 fixed C WIDTH 0 fixed CAN V CHIP V CHIP 0 1 1 CAN V CHIP OPT...

Page 10: ...xed VOL 75 75 volume control speciality 82 fixed 72700 ALC ALC 1 fixed 1 ALC ON VOL Baseband model input level adjustment 0 The unit no use SAP LEVEL SAP level 1 fixed SIF M BB M SIF and baseband mode...

Page 11: ...9 IC BLOCK DIAGRAM LA76931...

Page 12: ...panded video input and Y input 2 50 12 R ouput 2 65 53 Colour APC filter 3 40 13 G ouput 2 65 52 Selection video output and FSC output 2 40 14 B ouput 2 67 51 Cr input 2 50 15 AKB undo 2 31 50 4 43 MH...

Page 13: ...cicuit power input provide starting and stabling Operating current 23 4 Vfb Connect it with inverting input terminal of PWM comparator the collector of optical coupler can be connected to it To work s...

Page 14: ...12 AN7522 Pins function pin function pin function 1 power 7 GND input 2 CH1 output 8 CH2 input 3 GND 9 volume 4 CH1 output 10 CH1 output 5 Stand by 11 GND CH2 output 6 CH1 input 12 CH1 output LA78040...

Page 15: ...l input 23 AC coupling input 6 GND 24 ALC filter 7 SAP carrier level check 25 R output 8 26 L output 9 SIF decoupling filter 27 Reference voltage DC3 8V 10 mute 5V 28 AC coupling input 11 Serial data...

Page 16: ...V STEREO 3 0V STEREO SAP 3 8V 15 SAP detection sensitivity 33 Sub carrier input 3 579545MHZ 200Mv 16 dbx RMS detection 34 Filter adjustment check 17 Dbx broad band detection 35 Pilot dispel reference...

Page 17: ...XS501 XS202 XS203 XS701 TUNER XS601 XS602 XS301 XS604 XS201 XS302 N201 XS502 CRT DEGASSINGP COIL M108 FOCUS SCREEN MAIN BOARDP667 TSC30 01 POWER SWITCH KEY BOARDP667 TS2130 05 XS901 XS902 SPEAKER XS60...

Page 18: ...3 2 1 4 5 6 7 8 9 1 0 1 5 1 6 1 7 1 1 12 13 14 18 1 9 2 0 21 24 23 2 2...

Page 19: ...9 SPEAKER BRACKET 870 20849 00 10 FRONT CABINET ASSY 611 C53Y1 0H1 11 LED COLUMN 700 60164 00 12 DECORATIVE PIECE 743 10125 T0 13 BUTTON 877 50433 T0 14 BUTTON BOARD 782 TS2153 0500 15 MAIN BOARD ASSY...

Page 20: ...10012 00 BRAIDED WIARE SPRING 851 23010 11 SCREW SJ2824 ST3X10C D Zn 851 23010 11 SCREW SJ2824 ST3X10C D Zn 851 23010 11 SCREW SJ2824 ST3X10C D Zn 851 23012 14 SCREW SJ2824 ST3X12C Y 851 23012 14 SCRE...

Page 21: ...80671 00 SERVICE CARD 20 24 CRT 881 TS20537 00 OPERATION CARD 886 31132 159 CARTON BOX LET2053 LEGEND 887 20044 01 POWER CORD COVER 887 20047 01 ACCESSORY PALSTIC BAG 887 21096 P0 PE PEARL COTTONPALST...

Page 22: ...ITH HOUSING XS902 877 50433 T0 KEY PLATE 782 TS2153 0500 BUTTON PCB 667 TS2153 09 IR RECEIVE ASS Y 340 00001 00 DIODE 1N4148 VD902 340 10039 20 LED HFR205 RED VD901 352 38060 60 IC HRM138BB3006 M N901...

Page 23: ...UMPER WIRE J036 998 JUMPER WIRE J037 998 JUMPER WIRE J038 998 JUMPER WIRE J039 998 JUMPER WIRE J040 998 JUMPER WIRE J041 998 JUMPER WIRE J042 998 JUMPER WIRE J043 998 JUMPER WIRE J044 998 JUMPER WIRE...

Page 24: ...8 JUMPER WIRE J091 998 JUMPER WIRE J092 998 JUMPER WIRE J093 998 JUMPER WIRE J094 998 JUMPER WIRE J095 998 JUMPER WIRE J096 998 JUMPER WIRE J097 998 JUMPER WIRE J098 998 JUMPER WIRE J099 998 JUMPER WI...

Page 25: ...NER DIODE HZ12B1 VD515 340 52840 0G ZENER DIODE RD30E B3 VD101 340 80022 00 RECTIFIER T2SB60 VD501 343 01800 00 TRANSISTOR KSE180 TO 126 V502 343 10150 104 TRANSISTOR 2SA1015Y Pr2 5 V202 343 10150 104...

Page 26: ...H271JYR C405 459 2127H 902 CERAMIC CAPACITOR CC45 SL1H271JYR C406 459 2210K 00 CERAMIC CAPACITOR CT1 06 2B4 63V 102K C333 459 2210K 002 CERAMIC CAPACITOR CK45 B1H102KYR C333 459 2215K 002 CERAMIC CAPA...

Page 27: ...U POLYESTER CAPACITOR MKP 300VAC 0 1UF M C502 462 2B422 M0U POLYESTER CAPACITOR 250VAC 0 22uF M C501 462 83356 H0 POLYESTER CAPACITOR CBB21 200V 0 056uF J C304 462 83433 H0 POLYESTER CAPACITOR CBB21 2...

Page 28: ...4 464 6D610 M02 ELECTROLYTIC CAPACITOR CD110 16V 10uF M C605 464 6D610 M02 ELECTROLYTIC CAPACITOR CD110 16V 10uF M C607 464 6D610 M02 ELECTROLYTIC CAPACITOR CD110 16V 10uF M C608 464 6D610 M02 ELECTRO...

Page 29: ...J R407 467 1C115 H03 CARBON RESISTOR 1 6W 150 J R107 467 1C118 H03 CARBON RESISTOR 1 6W 180 J R211 467 1C133 H03 CARBON RESISTOR 1 6W 330 J R203 467 1C133 H03 CARBON RESISTOR 1 6W 330 J R326 467 1C139...

Page 30: ...1 6W 10K J R206 467 1C310 H03 CARBON RESISTOR 1 6W 10K J R226 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 R514...

Page 31: ...03 METAL RESISTOR 1 4W 5 1K F R213 467 2D282 G0 METAL RESISTOR 1 4W 8 2K G R311 467 2D330 G03 METAL RESISTOR 1 4W 30K G R512 467 2D418 H03 METAL RESISTOR 1 4W 180K J R513 467 2E001 H0 METAL RESISTOR 1...

Page 32: ...2X3 VD509 667 TSP30 01U MAIN PCB ASS Y AUTOMATIC INSERTION 667 TSP53 01C MAIN PCB ASS Y AUTOMATIC INSERTION 681 40003 00 OK LABEL 706 20173 00 HEAT SINK N503 706 20173 00 HEAT SINK V502 706 20249 00 H...

Page 33: ...0 RIVET GB876 86 2X2 5 COPPER M119 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M119A 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M122 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M125 895 6020025 50 RIVET...

Page 34: ...655 61201 154 6 PINS LEAD WITH HOUSING 384 40308 40 SPEAKER ST511 02...

Page 35: ...I ST O VCC9V MODE O LA72700 NS01 S R DET NS01 LA72700 CS05 1uF CS06 0 1uF CS07 0 1uF RS02 100 RS03 100 CS08 0 1uF CS09 22uF CS10 4 7uF CS11 4 7uF CS12 3 3uF CS13 4 7uF CS14 4 7uF CS15 1uF CS 4n7 CS16...

Page 36: ...ON C612 16V 10u C613 16V 10u R614 100K G V1 R1 V2 R2 G L2 R517 5K6 R515 5K6 R243 10K R527 100K C527 10n KEY KEY S C V OUT V OUT REM REM 9V Y DVD G 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 N601 TC4053 R6...