XOCECO LET3250, Service Manual

Page 1: ...COLOR TELEVISION LET3250 TS3250 ...

Page 2: ...CONTENTS Safety Precautions Alignment instruction Debugging instruction Block diagram IC Block diagram Wiring diagram Exploded view Part list Schematic diagram 1 2 3 9 10 14 15 17 35 ...

Page 3: ...familiar with the necessary precaution on this receiver The following are the necessary precautions to be observed before servicing this chassis 1 Since the power supply circuit of this receiver is directly connected to the AC power line an isolation transformer should be used during any dynamic service to avoid possible shock hazard 2 Always discharge the picture tube anode to the CRT conductive ...

Page 4: ...use of substitute replacement parts which do not have the same characteristics as specified in the parts list may create shock fire X RAY RADIATION or other hazards 2 Alignment items and procedure The alignment flow chart see below figure 3 TEST EQUIPMENT 3 1 AUDIO VOLTAMETER EEPROM copy B check Field breadth and field line RF AGC adjust Audio check Focus adjust and aging VG2 adjust White balance ...

Page 5: ... and no sync and sound abnormity electrophoresis of it 4 4 White balance and screen grid voltage adjustment After enter P5 of factory menu use remote sensor directly to adjust white balance by pressing the following digital buttons 1 R BIAS 2 G BIAS 3 B BIAS 4 R BIAS 5 G BIAS 6 B BIAS press p p button to select picture mode custom T1 T2 bright soft nature user custom will be display on the screen ...

Page 6: ...ltage and filament voltage check Connect a high voltage meter between anode cap of picture tube and the ground measure the filament voltage using rms voltmeter set the picture mode to standard the high voltage 29KV 1 5KV filament voltage 6 3 0 1Vrms 4 12 x ray protection check Receive local TV signal set the picture mode to standard shorten the circuit and measure the value of TP1 TP2 restart the ...

Page 7: ... linearity scanning and geometric distortion and over scanning coincide with it P3 50 V SIZE 50HZ field amplitude 75 4 10 V SHIFT 50HZ field center 0 4 10 H PHASE 50HZ H center 10 4 10 V LINE 50HZ V line 16 4 10 V SC 50HZ field S correct 20 4 10 P4 EW 50 TITL 50HZ echelon correct 49 DC 50HZ H amplitude 35 AMP 50HZ pincushion correct 41 COR TOP 50HZ Top margin correct 6 COR BOT 50HZ bottom margin c...

Page 8: ...PF TEST Color band filter center frequency 0 fixed P9 OVER MOD SW Selection over modulation function 0 Fixed 0 nothing 1 have OVER MOD LVL Adjustment over modulation working point 0 fixed BLK STR Dark level expand starting control point 2 Fixed 0 40IRE 2 60IRE 3 OFF BLK GAIN Dark level expand gain 2 Fixed 0 MIN 2 MAX Y APF Selection color trap filter 1 0 trap filter 1 direct pass YcbCr Y C PRE ADJ...

Page 9: ...ce TV AV model RY TV Red chromatism DC level 8 4 4 adjustment dark white balance TV AV model BY YUV DVD input Blue chromatism DC level 8 4 4 adjustment dark white balance DVD input RY YUV DVD input Red chromatism DC level 8 4 4 adjustment dark white balance DVD input S TRAP TEST Sound trap filter adjustment 6 fixed LOW BRI Min brightness 28 fixed LOW CONT Min contrast 30 fixed P13 COL KILL Achroma...

Page 10: ...he unit no use VOL OFFSET 0 GAIN 3 PWM LOGIC 0 AVL MODE 2 AVL DET LEVEL 0 AVL SLOPE 0 PWM SET PWM VOL Volume control of PWM set 1 fixed 1 CHIP VOL Volume control of mono 0 fixed VOL 1 1 volume control speciality 20 fixed VOL 25 25 volume control speciality 60 fixed VOL 50 50 volume control speciality 90 fixed VOL 75 75 volume control speciality 100 fixed 72700 ALC ALC 1 fixed 1 ALC ON VOL Baseband...

Page 11: ...LECTION V OUT N301 LA78041 H OUT V302 2SC2539 T301 FBT CRT DRIVE CRT EHV 28V VIDEO REM IF RF SIF CHROMA R G B POWER N501 CQ12656RT AC 120V 110V 110V AUDIO AMP AN7522 14V H VCC N503 5V 1 V SWITCH 4053 V IN TV OUT VIDEO OUT AUDIO OUT V OUT A OUT Y Cr Cb AUDIO IN VIDEO IN S IN Y Cr Cb C P U A SWITCH 4053 MTS ...

Page 12: ...10 MAIN IC LA76930 BLOCK DIAGRAM ...

Page 13: ... 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 MHZ crystal 2 73 16 Field sawtooth filter to capacitance 2 16 49 Cb input 2 50 17 Field output 2 34 48 Fast blank out input 0 18 VCO Reference voltage 1 65 47 R input 1 89 19 H BUS VCC 5V 27mA 6 81 46 G input 1 90 20 H APC f...

Page 14: ... high Level availability 0 35 VDD 5 00 31 I2C DATA 5 00 34 x T2 4 50 32 I2C CLOCK 5 00 33 x T1 2 70 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 ...

Page 15: ...13 FSCQ1265RT ...

Page 16: ...14 WIRING DIAGRAM ...

Page 17: ...EXPLODED VIEW ...

Page 18: ...NET ASSY 611 F50A3 0H1 10 SIDE AV BOARD ASSY 667 TS2950 29 11 12 SPEAKER 384 32108 50 13 STANDBY BUTTON 877 60594 00 14 BUTTON CAP 877 60542 00 15 BUTTON CAP 877 60534 01 16 RUBBER WASHER 868 20123 00 17 SPEAKER BRACKET 870 20693 00 18 LED COLUMN 700 60149 00 19 BUTTON 877 50409 00 20 CRT FIXED BLOCK 868 20319 00 21 COMPONENT NUT 648 30003 00 22 CRT 335 3412M 00U 23 CRT BOARD 667 TSE30 02 24 COVER...

Page 19: ...HT COVER BOARD MOLD GREY 808 70239 00 EVA GLUE 150X50X1 838 10012 00 BRAIDED WIARE SPRING 851 23012 11 SCREW SJ2824 ST3X12C DZn 851 23012 11 SCREW SJ2824 ST3X12C DZn 851 24014 11 SCREW SJ2824 ST4X14C D Zn 851 24014 11 SCREW SJ2824 ST4X14C D Zn 851 24014 11 SCREW SJ2824 ST4X14C D Zn 851 24014 11 SCREW SJ2824 ST4X14C D Zn 851 24014 14 SCREW SJ2824 ST4X14C Y 851 24014 14 SCREW SJ2824 ST4X14C Y 851 24...

Page 20: ...72 00 SERVICE CARD 27 32 CRT 881 TS32507 00 OPERATION CARD 886 31222 00 CARTON BOX COVER 886 31223 18 CARTON BOX LET3250 LEGEND 887 20044 01 POWER CORD COVER 887 21134 P0 PE PEARL COTTONPALSTIC BAG 1800X1400 887 21188 00 CLASPER PALSTIC BAG 350X250RED TRANSPARENT 893 10300 11 NUT GB6170 86 M3 D Zn 893 10300 11 NUT GB6170 86 M3 D Zn 893 20800 11 NUT GB6172 86 M8 D Zn 893 20800 11 NUT GB6172 86 M8 D...

Page 21: ... RS04 467 1C115 H03 CARBON RESISTOR 1 6W 150Ω J RS09 467 1C168 H03 CARBON RESISTOR 1 6W 680Ω J RS05 467 1C168 H03 CARBON RESISTOR 1 6W 680Ω J RS10 467 1C210 H03 CARBON RESISTOR 1 6W 1K J RS03 467 1C210 H03 CARBON RESISTOR 1 6W 1K J RS08 467 1C233 H03 CARBON RESISTOR 1 6W 3 3K J RS01 467 1C418 H03 CARBON RESISTOR 1 6W 180K J RS02 471 2068K 103 PEAKING COIL LGA0410 68uH K LS01 998 JUMPER WIRE WS01 4...

Page 22: ...5 H0 METAL RESISTOR 2W 15kΩ JL R421 467 8E227 H0A SOLID RESISTOR 1 2W 2 7KΩ J R413 467 8E227 H0A SOLID RESISTOR 1 2W 2 7KΩ J R414 467 8E227 H0A SOLID RESISTOR 1 2W 2 7KΩ J R415 340 00001 00 DIODE 1N4148 VD401 340 00001 00 DIODE 1N4148 VD402 340 00001 00 DIODE 1N4148 VD403 471 2068K 10 PEAKING COIL LGA0410 68uH K L402 343 18150 10 TRANSISTOR 2SC1815 Y V404 998 JUMPER WIRE R410 998 JUMPER WIRE R411 ...

Page 23: ... N501 352 24080 50 IC M24C08BN6 N202 352 40520 60 IC TC4052BP M N702 352 40530 00 IC TC4053BP M N601 352 75220 00 IC AN7522N M N701 352 76932 30 IC LA76932N 7N56P7 E 352 78041 00 IC LA78041 M N301 352 78050 00 IC KA7805 M N503 352 78050 00 IC KA7805 M N505 352 78090 40 IC TA78M09P D N201 364 32101 00 2 PINS CONNECTORS TJC3 02A X202 364 32108 00 2 PINS CONNECTORS TJC1 2A XS502 364 33101 00 3 PINS C...

Page 24: ...M0 ELECTROLYTIC CAPACITOR CD110 16V 470uF M C240 464 6D822 M0 ELECTROLYTIC CAPACITOR CD110 16V 2200uF M C721 464 6E822 M0 ELECTROLYTIC CAPACITOR CD110 25V 2200uF M C329 464 6F747 M0 ELECTROLYTIC CAPACITOR CD110 35V 470uF M C335 464 6F810 M0 ELECTROLYTIC CAPACITOR CD110 35V 1000uF M C317 467 1C075 H0 CARBON RESISTOR 1 6W 75Ω J R610 467 1C247 H0 CARBON RESISTOR 1 6W 4 7K J R202 467 2D247 F0 METAL RE...

Page 25: ... FIXED BLADE 741 10001 02 WIRE FIXED BLADE 742 30005 09 LINE TIE 775 10054 00 SOLDERING BLADE A1 775 10054 00 SOLDERING BLADE A2 775 60044 00 SOCKET PIN RT 01T 1 3B TP1 775 60044 00 SOCKET PIN RT 01T 1 3B TP2 775 60137 00 HOLLOW PILLAR φ2 36 14B R332 775 60137 00 HOLLOW PILLAR φ2 36 14B VD318 775 60137 00 HOLLOW PILLAR φ2 36 14B VD509 775 60137 00 HOLLOW PILLAR φ2 36 14B 808 60835 040 BLACK PLATE ...

Page 26: ...E J104 998 JUMPER WIRE J106 998 JUMPER WIRE J107 998 JUMPER WIRE J108 998 JUMPER WIRE J109 998 JUMPER WIRE J110 998 JUMPER WIRE J201 998 JUMPER WIRE J202 998 JUMPER WIRE J203 998 JUMPER WIRE J204 998 JUMPER WIRE J205 998 JUMPER WIRE J206 998 JUMPER WIRE J207 998 JUMPER WIRE J208 998 JUMPER WIRE J209 998 JUMPER WIRE J210 998 JUMPER WIRE J212 998 JUMPER WIRE J213 998 JUMPER WIRE J214 998 JUMPER WIRE...

Page 27: ...JUMPER WIRE J310 998 JUMPER WIRE J311 998 JUMPER WIRE J312 998 JUMPER WIRE J501 998 JUMPER WIRE J502 998 JUMPER WIRE J503 998 JUMPER WIRE J505 998 JUMPER WIRE J506 998 JUMPER WIRE J507 998 JUMPER WIRE J508 998 JUMPER WIRE J509 998 JUMPER WIRE J510 998 JUMPER WIRE J511 998 JUMPER WIRE J512 998 JUMPER WIRE J513 998 JUMPER WIRE J514 998 JUMPER WIRE J515 998 JUMPER WIRE J516 998 JUMPER WIRE J517 998 J...

Page 28: ...E S5295J VD301 340 00005 003 DIODE S5295J VD313 340 00011 003 DIODE 1N4002 VD308 340 00291 003 DIODE TEU2YX VD508 340 50470 003 ZENER DIODE HZ5B1 VD503 340 50560 003 ZENER DIODE HZ6B1 VD511 340 50750 003 ZENER DIODE HZ7C2 VD307 343 10150 104 TRANSISTOR 2SA1015Y Pr2 5 V202 343 10150 104 TRANSISTOR 2SA1015Y Pr2 5 V203 343 10150 104 TRANSISTOR 2SA1015Y Pr2 5 V304 343 10150 104 TRANSISTOR 2SA1015Y Pr2...

Page 29: ...59 2322R 002 CERAMIC CAPACITOR CT1 10 2F4 63V 223Z C202 459 2347R 002 CERAMIC CAPACITOR CT1 14b 2E 63V 473Z C231 459 2410R 002 CERAMIC CAPACITOR DD308 63F104Z50 C228 459 2410R 002 CERAMIC CAPACITOR DD308 63F104Z50 C230 459 5122K 002 CERAMIC CAPACITOR RQC05B221K 6H46UA C302 459 5139K 002 CERAMIC CAPACITOR CK45 B2H391KYR C306 459 5168K 002 CERAMIC CAPACITOR RQC06B681K 6H46UA C315 459 5168K 002 CERAM...

Page 30: ...YTIC CAPACITOR CD110 50V 47uF M C509 464 62547 M02 ELECTROLYTIC CAPACITOR CD288 160V 4 7uF M C307 464 62547 M02 ELECTROLYTIC CAPACITOR CD288 160V 4 7uF M C338 464 6C710 M02 ELECTROLYTIC CAPACITOR CD110 10V 100uF M C105 464 6C710 M02 ELECTROLYTIC CAPACITOR CD110 10V 100uF M C209 464 6C710 M02 ELECTROLYTIC CAPACITOR CD110 10V 100uF M C225 464 6C747 M02 ELECTROLYTIC CAPACITOR CD110 10V 470uF M C218 4...

Page 31: ...0Ω J R108 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R110 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R218 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R219 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R224 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R228 467 1C110 H03 CARBON RESISTOR 1 6W 100Ω J R232 467 1C115 H03 CARBON RESISTOR 1 6W 150Ω J R107 467 1C120 H03 CARBON RESISTOR 1 6W 200Ω J R211 467 1C122 H03 ...

Page 32: ...J R220 467 1C247 H03 CARBON RESISTOR 1 6W 4 7K J R243 467 1C247 H03 CARBON RESISTOR 1 6W 4 7K J R313 467 1C247 H03 CARBON RESISTOR 1 6W 4 7K J R615 467 1C247 H03 CARBON RESISTOR 1 6W 4 7K J R616 467 1C247 H03 CARBON RESISTOR 1 6W 4 7K J R720 467 1C251 H03 CARBON RESISTOR 1 6W 5 1K J R516 467 1C251 H03 CARBON RESISTOR 1 6W 5 1K J R524 467 1C251 H03 CARBON RESISTOR 1 6W 5 1K J R526 467 1C251 H03 CAR...

Page 33: ...K J R733 467 1C410 H03 CARBON RESISTOR 1 6W 100K J R737 467 1C410 H03 CARBON RESISTOR 1 6W 100K J R743 467 1C410 H03 CARBON RESISTOR 1 6W 100K J R744 467 1C415 H03 CARBON RESISTOR 1 6W 150K J R225 467 1C439 H03 CARBON RESISTOR 1 6W 390K J R207 467 1C439 H03 CARBON RESISTOR 1 6W 390K J R222 467 1C468 H03 CARBON RESISTOR 1 6W 680K J R233 467 1C510 H03 CARBON RESISTOR 1 6W 1M J R223 467 1D227 H03 CAR...

Page 34: ...020025 50 RIVET GB876 86 2X2 5 COPPER M27 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M28 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M29 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M30 895 6020025 50 RIVET GB876 86 2X2 5 COPPER M31 895 6020025 50 RIVET GB876 86 2X2 5 COPPER T301 895 6020025 50 RIVET GB876 86 2X2 5 COPPER V302 895 6020025 50 RIVET GB876 86 2X2 5 COPPER 895 6025030 50 RIVET GB876 86 2...

Page 35: ...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 655 31201 108 3 PINS LEAD WITH HOUSING X902 655 41201 245 4 PINS LEAD WITH HOUSING X901 782 TS...

Page 36: ...68K TP1 TP1 TP2 TP2 V506 C1815 R524 5K6 R523 10K OFF ON C605 16V 10u C60810u 16V R612 100K R614 15K R613 6K8 R525 220 V505 C1815 R526 5K6 R5165K6 R515 5K6 R243 10K R527 100K C527 10n R528 5K6 S DET S DET KEY KEY S C VIN AV1 AV2 A REM REM 9v DVD DVD R244 1K8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 N601TC4053 TVO R620 75 R245 10K L203 68uH L204 68uH C245 0 1 3 1 2 N504 TL431 R706 10K R707 560K R708 1...