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XOCECO LC-30K9A(W), Service Manual

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L40K9A SCH.

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Summary of Contents for LC-30K9A(W)

Page 1: ...COLOR TELEVISION LC 30K9A W LC 40K9A...

Page 2: ...Trouble shooting Principle analysis of L30K9A w and 40K9A BLOCK DIAGRAM Wiring diagram Serial No of Parts Identification criteria for the bright spot and dark spot of the LCD screen Troubleshooting gu...

Page 3: ...chen or nearby fire source heating equipment and devices or exposure to sunlight etc Otherwise bad effect will result 2 5 If any foreign substance such as water liquid metal slices or other matters ha...

Page 4: ...as commmonly called ghost shadow The extent of the residual picture varies with the maker of LCD screen This phenonmenon doesn t represent failure This ghost shadow may remain in the picture for a pe...

Page 5: ...o central signal source check if various TV functions station skipping modulate quantity control etc check if the output of earphone and speaker are normal Combined test for general assembly Input AV...

Page 6: ...that of the seventh grade to 400nit Fix B CUT and B DRV at 128 Adjust R G CUT to set the second color coordinates to 270 283 Adjust R G DRV to set the seventh grade color coordinates to 270 283 Repeat...

Page 7: ...over Adjust the value of Option to 9 S bright to 124 S contrast to 140 4 3 2 White balance adjustment of TV channel Input AV signal PM5518 grey grade signal enter the adjustment menu of white balance...

Page 8: ...e broadcast signal itself is not good Check 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 i...

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: ...ected Check if the cable connection is loose When playing VHS picture search tape there are lines at the top or bottom of the picture When being played or in pause VHS picture search tape sometimes ca...

Page 11: ...te RGB signal of VGA undergoes A D conversion before being subject to selection and digit display processing together with another route of signal including OSD GAMMA calibration brightness and contra...

Page 12: ...U2 MICRO CONTRLER TSC80251G2D U4 FLASHMEMORY IR SIF AV1 SVHS R L AV2 R L D4 1 R L D4 2 R L VGA R L PCMCI R L AV R L OUT NA04 AUDIO PROCESSOR MSP3420 U34 HEF4052 NA05 SRS 3D STEREO CONTROLLER M62494 N...

Page 13: ...OR N401 M62429E N404 LX1722 Amplifier SPEAKER VGA N301 Image Processor Scaler MCU OSD DC IN connector PANEL DXE N201 DXO N202 DS90C383 LVDS DRIVER BOX power monitor power lamp panel 2 x 4 48bit R L DV...

Page 14: ...the operation of IC 27 28 PIN output left and right sound channel R L to speaker processor 36 37 PIN AV OUT of sound R L 47 48 PIN D4 1 D4 2 PCMCIA YCbCr selected input R L 50 51 PIN Input of VGA R L...

Page 15: ...PIN Input Y of PCMCIA YCbCr 6 PIN Input V of PCMCIA YCbCr 31 34 37 40 PIN output format signal of ITU R656 70 PIN Video of AV OUT 71 PIN Input C of SVHS 72 PIN input Video SVHS in priority of Y or AV...

Page 16: ...ortA 7 0 GPIO PWM IR Decoder A 19 1 D 15 0 CS 1 0 2 Wire Serial Microprocessor Bus Display Timing Generator Memory Out Bus Memory Buffer Processor Memory Interface Memory In Bus OSD VYUV 7 0 VCLK VPEN...

Page 17: ...15 4 JAG ASM...

Page 18: ...16 5 SiI170...

Page 19: ...17 6 LX1722...

Page 20: ...18 WIRING DIAGRAM 1 L30K9A W...

Page 21: ...19 2 L40K9A...

Page 22: ...353 80251 10 Self produced Infra red receive assy 667 L30K9 09 667 L40D9 09 Self produced KEY board assy 667 L30K9 05 Self produced PCMCIA board assy 667 L40D9 90 N8 ES6420 353 64200 20 Self produced...

Page 23: ...mm 5mm Total defected point 8 7 5 4 Notes 1 Definition of defected point bright spot dark spot It is identified as a defected point if its area exceeds 1 2 of a single picture element R G B 2 Definiti...

Page 24: ...CK LIGHT ON Back light off no no normal normal no no Check whether power supply IC Check power supply circuit and IC Check whether N205 pin3 the voltage changing low level Replace N205 No screen displ...

Page 25: ...waveform of NA05 pin1 and pin2 Check whether N401 pin2 and pin7 have output Check the pin2 of N404 output triangle waveform Check whether the front of L404 L405 L406 L407outpu ts waveform ratio 1 1 R...

Page 26: ...est U38 waveform from TXC TX0 TX2 Test whether U38 power supply 3 3V Test wether U38 pin2 pin4 pin5 pin57 waveform Check path turned 5V into 3 3v Replace U38 Test whether power supply 1 5v 2 5v 3 5v C...

Page 27: ...ture Enter factory adjustment menu execute CLEAR EEPROM after operation shut off and re put on to check if there is a picture change CPU board Calibrate CPU board Replace CPU board Screen display NO S...

Page 28: ...1 2 5 4 6 7 8 9 10 13 14 15 16 19 20 21 22 23 24 25 26 27 32 33 34 35 36 37 38 39 40 41 42 12 11 3 17 18 28 29 30 31 L30K9A W EXPLODED VIEWS...

Page 29: ...grille right 13 loudhailer left 34 speaker s front cover right 12 socket wp2 9c left 33 loudhailer right 11 speaker s front cover left 32 socket wp2 9c right 10 speaker grille left 31 speaker s front...

Page 30: ...1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 33 34 35 36 37 38 32 LC40K9A EXPLODED VIEWS...

Page 31: ...tor board 12 pnael connect parts left 33 shielding board 11 screw 32 shielding board 10 LED column 31 shielding cover 9 wall connect parts 30 shielding cover 8 transition parts B 29 socket 7 pnael con...

Page 32: ...L30K9A W SCH...

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Page 50: ...L40K9A SCH...

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Page 54: ...F CB27 0 1UF CB16 0 1UF 1 2 CB47 100UF CB55 0 1UF CB17 0 1UF CB37 0 1UF R24 0 OHM 1 2 CB23 100UF CB40 0 1UF IN 3 OUT 2 ADJ 1 N13 2830 3 3V CB36 0 1UF CB4 0 1UF CB5 0 1UF 1 2 CB22 10UF 1 2 X2 Power 1 2...

Page 55: ...R22 33OHM D0 3 D1 4 D2 7 D3 8 D4 13 D5 14 D6 17 D7 18 OC 1 CLK 11 Q0 2 Q1 5 Q2 6 Q3 9 Q4 12 Q5 15 Q6 16 Q7 19 N2 74HCT374 V1 FDN338P 1 2 C5 100UF 1 2 C7 47UF C8 0 1UF C14 0 1UF C12 0 1UF R11 10K V2 F...

Page 56: ...LA18 LA4 LA2 LA9 LD6 LD5 LD7 LD0 RST LA5 LA16 LA17 LA11 LA10 LD3 LD1 LA13 LA15 LA3 LA8 LA0 LA21 LA19 LA6 LD4 LA12 LA7 LA1 LD2 LA14 LD 0 7 LA 0 19 LD 0 7 A0 12 A1 11 A2 10 A3 9 A4 8 A5 7 A6 6 A7 5 A8 2...

Page 57: ...DMA7 62 DMA8 63 DMA9 64 DMA10 65 DMA11 66 VSS 67 DCAS 69 DSCK DOE 70 DWE 71 DRAS0 72 DBANK0 DRAS1 73 DBANK1 DRAS2 74 VSS 76 DB0 77 DB1 78 DB2 79 DB3 80 DB4 81 DB5 82 VSS 84 DB6 85 DB7 86 DB8 87 DB9 8...

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