XOCECO LC20H3D, Service Manual

Page 1: ...COLOR TELEVISION LC20H3D...

Page 2: ...Method of software upgrading Brief introduction and working principle of L20H3 Wiring diagram Serial NO of parts Identification criteria for the bright spot and dark spot of the LCD screen Troubleshoo...

Page 3: ...other matters happens to fall into the module be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high...

Page 4: ...isplaying still picture in high brightness for a long time 3 Points for attention during installation 3 1 The front panel of LCD screen is of glass Wheng installing it please make sure to put it in pl...

Page 5: ...er the indication lamp of the infrared receiving board turns blue or yellow Measure L102 PIN2 to be5 0 V measure L107 PIN2 to be 3 3 V d Flash write DDC program Input YprPb signal check if the display...

Page 6: ...perature so that x 270 y 283 red color temperature is constant as128 g Exit from the factory menu and enter route RGB Input 60Hz pane signal C_Hat_16x12 W through port VGA Enter the user menu and adju...

Page 7: ...e clock MHz H SYNC kHz V SYNC Hz remark 640x480 60 25 175 31 469 59 900 720x400 70 28 322 31 469 70 086 800x600 60 40 000 37 879 60 317 1024x768 60 65 000 48 363 60 004 640x480 75 31 500 37 500 75 000...

Page 8: ...if the outdoor antenna is disconnected Check if the antenna is correctly oriented Fringe in picture Check if the antenna is correctly oriented Maybe there is electric wave reflected from hilltop or b...

Page 9: ...e liquid crystal TV set and make proper adjustment according to the signal types Picture too bright and there is distortion in the brightest area Check if the contrast setting is too high Possibly the...

Page 10: ...emote control so as to enable the liquid crystal TV set to recheck the signal and then to display correct picture signal Method of software upgrading Steps of software upgrading are as follows 1 Selec...

Page 11: ...equency signal undergoes an integrated tuner TUNER1 before a color full video signal is generated This video signal then enters analog board decoder IC N303 VCT3833 Pin19 where it is processed and it...

Page 12: ...10 BLOCK DIAGRAM...

Page 13: ...Ground Ground Ground VCC CTL H IN1 L IN2 Red 1 input Green 1 input Blue 1 input Red 2 input Green 2 input Blue 2 input VD 1 input VD 2 input VD output Blue output Composite sync output Composite vide...

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Page 16: ...GPIO PWM IR Decoder A 19 1 D 15 0 CS 1 0 2 Wire Serial Microprocessor Bus Memory Out Bus Memory Buffer Processor Memory Interface Memory In Bus OSD VYUV 7 0 VCLK VPEN PW130 ImageProcessor Internal Blo...

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Page 20: ...ply L switch VCO 21 20 18 Loop filter 14 Offset comp optional 26 FPLL 0 90 VIF amp 6 7 8 15 VIF CAGC CBL Take over point SIF input switch CAGC 22 12 4 9 16 13 Standard switch 23 VS 17 CRef Intercarrie...

Page 21: ...IN Y Cb Cr 4ps X208 PW1306 4ps X602 9ps X203 9ps X102 5ps X603 30ps X204 8ps KEY BOARD back TOLCDPANEL Vout Lout Rout Vin Lin Rin AUDIO IN HEAD PHONE S VHS MSP3420 VCT3803 4ps X609 9ps X603 5ps X602...

Page 22: ...is identified as a dark spot if it is dark in the state of white field and its dark size remains unchanged 4 Definition of two neighboring points Defects of a group of picture elements RB RG GB 15 17...

Page 23: ...signal Check whether U1 pin 11 have output waveform Check N8 pin3 pin 5 s input signal Replace N8 Yes No Yes No No No Yes No No 21 Troubleshooting guide No raster Does the logo appear on the screen wh...

Page 24: ...B Hors Vers at X7 Check whether N1 has 5V power supply Check whether X9 pin 1 pin 2 have 5V power input Replace N2 Replace V105 V17 Replace N1 Measure N1 pin 33 pin 35 waveform Measure N1 pin 42 pin...

Page 25: ...1 2 3 4 5 6 7 8 9 101112 13 14 15 16 17 18 23 EXPLODED VIEW...

Page 26: ...le 808 60865 02 6 Button 667 L20H3 05 7 Screw 851 13010 11 8 Screw 851 34008 51 9 Speaker 384 40906 00 10 Remote receiver board 667 L20H3 09 11 LED column 706 60188 100 12 LOGO No number 13 Front cove...

Page 27: ...LINE BLUE GREEN RED 665 D0002 422 VIDEO LINE YELLOW WHITE RED 665 D0002 490 CONNECT LINE SP0402201043 02 665 N0300 00 COAXIAL CABLE CSYV 2B 300 666 12301 00 FERRITE BEAD TY23X13 5X6 666 12301 00 FERR...

Page 28: ...20H3 DIGISTAR 881 80773 00 OPERATION CARD Digistar L20H3 881 80788 00 REGISTER CARD DIGISTAR 881 80790 00 EXTENDED CARD DIGISTAR 15 20LCD 881 80811 00 ACKNOWLEDGEMENT CARD DIGISTAR 886 31021 00 ACCESS...

Page 29: ...5 L601 471 2010K 003 PEAKING COIL SPT0305 100K 5 L603 471 2010K 003 PEAKING COIL SPT0305 100K 5 L605 471 2010K 003 PEAKING COIL SPT0305 100K 5 L606 471 2010K 003 PEAKING COIL SPT0305 100K 5 L607 471 2...

Page 30: ...14 455 12110 H0 SMD RESISTOR FTR0603101JR R328 455 12110 H0 SMD RESISTOR FTR0603101JR R334 455 12110 H0 SMD RESISTOR FTR0603101JR R603 455 12110 H0 SMD RESISTOR FTR0603101JR R604 455 12110 H0 SMD RESI...

Page 31: ...R0603104JR R619 455 12410 H0 SMD RESISTOR FTR0603104JR R624 455 12410 H0 SMD RESISTOR FTR0603104JR R628 455 12410 H0 SMD RESISTOR FTR0603104JR R630 455 12410 H0 SMD RESISTOR FTR0603104JR R633 455 1241...

Page 32: ...603CG182J250BA C431 456 2218H 11 SMD CAPACITOR 0603CG182J250BA C435 456 2222H 11 SMD CAPACITOR 0603CG222J250BA C437 456 2222H 11 SMD CAPACITOR 0603CG222J250BA C438 456 2310R C1 SMD CAPACITOR 06032E103...

Page 33: ...ACITOR 0603CG221J500BA C310 456 3122H 11 SMD CAPACITOR 0603CG221J500BA C315 456 3122H 11 SMD CAPACITOR 0603CG221J500BA C316 456 3147H 11 SMD CAPACITOR 0603CG471J500BA C405 456 3147H 11 SMD CAPACITOR 0...

Page 34: ...YTIC CAPACITOR CD110 10V 47uF M C330 464 6C647 M02 ELECTROLYTIC CAPACITOR CD110 10V 47uF M C340 464 6C647 M02 ELECTROLYTIC CAPACITOR CD110 10V 47uF M C344 464 6C647 M02 ELECTROLYTIC CAPACITOR CD110 10...

Page 35: ...CD110 16V 100uF M C104 464 6D722 M0 ELECTROLYTIC CAPACITOR CD110 16V 220uF M C711 464 6D747 M0 ELECTROLYTIC CAPACITOR CD110 16V 470uF M C103 464 6D747 M0 ELECTROLYTIC CAPACITOR CD110 16V 470uF M C105...

Page 36: ...TOR CDPS 10V 22uF M C115 454 03622 MA SMD ELECTROLYTIC CAPACITOR CDPS 10V 22uF M C121 454 03622 MA SMD ELECTROLYTIC CAPACITOR CDPS 10V 22uF M C129 454 03622 MA SMD ELECTROLYTIC CAPACITOR CDPS 10V 22uF...

Page 37: ...R227 455 12075 H0 SMD RESISTOR FTR0603750JR R228 455 12110 H0 SMD RESISTOR FTR0603101JR R104 455 12110 H0 SMD RESISTOR FTR0603101JR R106 455 12110 H0 SMD RESISTOR FTR0603101JR R110 455 12110 H0 SMD R...

Page 38: ...H0 SMD RESISTOR FTR0603332JR R707 455 12233 H0 SMD RESISTOR FTR0603332JR R713 455 12233 H0 SMD RESISTOR FTR0603332JR R721 455 12247 H0 SMD RESISTOR FTR0603472JR R105 455 12247 H0 SMD RESISTOR FTR06034...

Page 39: ...0K J R901 455 30047 H9 SMD RESISTOR ARV241 47 J R333 455 30047 H9 SMD RESISTOR ARV241 47 J R334 455 30047 H9 SMD RESISTOR ARV241 47 J R335 455 30047 H9 SMD RESISTOR ARV241 47 J R336 455 30047 H9 SMD R...

Page 40: ...ACITOR C2012Y5V1E104ZT C317 456 2410R C2 SMD CAPACITOR C2012Y5V1E104ZT C351 456 2410R C2 SMD CAPACITOR C2012Y5V1E104ZT C501 456 2410R C2 SMD CAPACITOR C2012Y5V1E104ZT C503 456 2410R C2 SMD CAPACITOR C...

Page 41: ...56 3033H 11 SMD CAPACITOR C1608CH1H330JT C911 456 3033H 11 SMD CAPACITOR C1608CH1H330JT C912 456 3118H 11 SMD CAPACITOR 0603CG181J500BA C223 456 3118H 11 SMD CAPACITOR 0603CG181J500BA C225 456 3118H 1...

Page 42: ...1 25T 1 8AW X2 851 13010 11 SCREW P T3X10A DZn 877 50449 00 KEY 877 60609 0T0 BUTTON COVER PLATE SILVERY WHITE 667 L20H3 09 IR RECEIVE ASS Y 667 L20H3 09 IR RECEIVE ASS Y MANUAL INSERTION 340 10084 90...

Page 43: ...ASS Y 852 34008 81 SCREW B M4X8 D Zn 855 B0016 00 EXPANDING BOLT M8X72 855 C4030 00 SCREW 4X30 605 L20H37 00 WALL MOUNT GUIDE 0520 886 31511 00 WALL MOUNT PACKING BOX 887 21167 00 WALL MOUNT ACCESSORY...

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