akira LCT-20CVST Service Manual Download Page 35 | Manualshive

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Model No.: LCT-20CVST
Version: 1.0

U-COM

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Summary of Contents for LCT-20CVST

Page 1: ...LCT TV Service Manual ...

Page 2: ... 2 Model No LCT 20CVST Version 1 0 MODEL LCT 20CVST ...

Page 3: ... 20CVST Version 1 0 CONTENTS SPECIFICATION 4 ADJUSTMENT SPECIFICATION 8 PCB ASSEMBLY FUNCTIONAL DESCRIPTION 11 BLOCK DIAGRAM 16 IMPORTANT IC LIST 17 TROUBLE SHOOTING 18 EXPLODED VIEW 22 PART LIST 30 CIRCUIT DIAGRAM 32 ...

Page 4: ...y 12ms Viewing Angle R L 176 Degree U D 176 Degree Backlight Assembly 6 CCFL Contrast Ratio 350 1 In Out Jack Power Input AC100 240V 50 60Hz Antenna Input 75 Ohm Unbalanced Coaxial Cable PC Input 15 Pin D sub Jack Female Type RGB Analog Input Included Main Board PC Audio Input Phone Jack Stereo From PC Included Main Board Video Audio In Out Included Sub Board Video Input 1 Composite RCA 3Pin Inclu...

Page 5: ...ing the adjustment item Panel Option in mass production Electrical specification In Out Items Sub Items Specification Video 1 2 Level 1 0 1p_p 75Ω Analog RGB 0 7 0 1Vp_p 75Ω H Frequency 31KHz PC V Frequency 56 85Hz Y 1Vp_p Cb 0 7Vp_p DVD Level Cr 0 7Vp_p INPUT Sound Level 1 4 0 2Vp_p 0 5Vrms A V OUT Level 2 0 1Vp_p OUTPUT Sound Speaker RMS 5W 2 Input Voltage AC 90 265 Vac Input Frequency 47 63Hz O...

Page 6: ...480 37 500 75 000 31 500 VGA 640 x 480 43 269 85 008 36 000 OSD Specification PICTURE CONTRAST BRIGHTNESS COLOR TEMPERAT PC input mode only STANDARD 6500K USER RESET 9300K SHARPNESS Not Available PC MODE COLOR Not Available PC MODE SOUND TREBLE BASS BALANCE S MODE GEOMETRY PC input mode only H POSITION V POSITION AUTO POSITION FUNCTION TRACKING PC input mode only AUTO TRACKING CLOCK PHASE INFORMAT...

Page 7: ...COLOR GAIN OPTION MX88L281 1 MST9883 1 PC input mode only MST9883 2 PC input mode only SUB C VCO SUB C CHG CURRENT INIT VCO CURRENT VPC3230 excluding PC MODE CONTRAST BRIGHTNESS PEAKING CIP CONTRAST CIP BRIGHT In mass production adjust only Factory ADJ item do not adjust other Modes In the time of variation of A S initial condition of screen quality built in other Modes for controlling ...

Page 8: ...y adjustment 1 Connect the outlet VIDEO PATTERN GENERATOR ANALOG RGB SEPARATE H V OUT to INPUT 15PIN D sub with VGA CABLE 2 TEST PATTERN 1DOT MOIRE PATTERN 3 Select Output FORMAT into 640 x 480 60HZ 4 Turn on the SET and them select in PC MODE 4 Adjustment Instruction 1 Press SEL Power Key in Front panel at the same time go to Factory mode 2 Select CLOCK DELAY including in FACTORY ADJ MENU with CH...

Page 9: ...In Factory mode select Auto Color Gain in Factory ADJ Press VOL UP KEY and then displaying the phrase Processing AUTO Adjustment start When adjustment is completed the phrase Processing disappears Caution In the course of Processing do not remove the signal Setting Instruction for OPTION 1 OPTION X2 BYPASS Using 6 BIT PANEL Back Light Control of Inverter Bright Max LOW Min HIGH 2 OPTION X2 INVERT ...

Page 10: ...t of VIDEO PATTERN GENERATOR to the input terminal of CVBS TEST PATTERN Select COLOR BAR PATTERN Turn on the SET and then select in VIDEO MODE 4 Adjustment Instruction Press SEL Power Key in Front Panel at the same time and go to Factory mode Select VPC3230 in Factory mode Adjust to the following levels with VOLUME UP DOWN CH UP DOWN a CONTRAST 52 b BRIGHT 9 c PEAKING 0 d CIP CONTRAST 12 e CIP BRI...

Page 11: ... Video input RCA 1P jack JA201 Sound input RCA 4P jack JA204 Video 2 DVD input RCA 4P Jack JA206 Head phone output Ear phone jack EJ310CD 5 A 3 5 CN21M Tuner connector 8 Moles 53014 08 CN70M Inverter connector 12 Molex53015 12 CN01M OSD Control connector 8 Molex53015 08 CN002 RS232 Control connector option 4 Molex 53015 04 CN25M Speaker Connector 4 Molex 53015 04 CN72M Interface connector 40 PH03 ...

Page 12: ...ol by voltage method 8 BRTC Backlight ON OFF signal 9 NC 10 GND 11 GND 12 GND GND CN25M speaker connector Pin No Symbol Description 1 R Speaker out right 2 R GND 3 L GND 4 L Speaker out left CN72M interface connector Pin No Symbol Description 1 VLCD 12Vcc 2 VLCD 12Vcc 3 RA0 Red Data LSB 4 RA1 Red Data 5 RA2 Red Data 6 RA3 Red Data 7 RA4 Red Data 8 RA5 Red Data 9 GND Ground 10 GND Ground 11 RA6 Red...

Page 13: ... GA4 Green Data 20 GA5 Green Data 21 GA6 Green Data 22 GA7 Green Data MSB 23 BA0 Blue Data LSB 24 BA1 Blue Data 25 GND Ground 26 GND Ground 27 BA2 Blue Data 28 BA3 Blue Data 29 BA4 Blue Data 30 BA5 Blue Data 31 BA6 Blue Data 32 BA7 Blue Data MSB 33 GND Ground 34 GND Ground 35 LVSYNC Vertical sync 36 LCKA Dot Clock 37 GND Ground 38 GND Ground 39 LHSYNC Horizontal Sync 40 LDTC Data Enable ...

Page 14: ...ntrol PCB connector and switch identification Reference Description Connector type Sw1 POWER IT 1102AH T Sw2 SELECT IT 1102AH T Sw3 VOL IT 1102AH T Sw4 VOL IT 1102AH T Sw5 CH IT 1102AH T Sw6 CH IT 1102AH T Sw7 Menu IT 1102AH T LED LED SAM3270 RM03 Remocon reciver Rom N338TM2 CNC01 OSD Connector MOLEX 53015 0810 Tuner board Tuner control board assembly ...

Page 15: ...g PAL B GD K I SECAM L L LOW 48 25MHz 168 25MHz VHF HI 175 25MHz 463 25MHz Channel UHF 471 25MHz 855 25MHz TUNER PCB connector and switch identification Pin No Symbol Description 1 VCC 5V 2 GND GND 3 SDA I2C serial Data 4 SCL I2C serial clock 5 GND GND 6 CVBS CVBS out 7 GND GND 8 SIF Sound if out ...

Page 16: ... 16 Model No LCT 20CVST Version 1 0 BLOCK DIAGRAM ...

Page 17: ... IC Video S W TEA6425D SOIC 1 IC302 5 IC ADC MST9883C 110 LQFP 80 1 IC360 6 IC Memory HY57V16160DTC 7 SOP 50 2 IC701 IC702 7 IC Micom S3P863AXZZ OTP DIP DIP 1 IC0001 8 IC TTX SAA5264PS M3 0104 DIP DIP 1 ICX1 9 IC Audio AMP TDA1519B SOT110 1 IC251 10 IC RGB S W TEA5114A DIP DIP 1 ICS1 11 IC EEPROM 24C16 ROM DIP DIP 1 IC002 12 IC Logic N74F14D SOIC 1 IC362 13 IC EEPROM 24C02 DIP DIP 1 ICX2 14 IC Res...

Page 18: ...hart PC stable adjustment The image is too light or too dark Adjust the brightness and contrast Horizontal bars appear to flicker jitter or shimmer on the image Adjust the clock function Auto tracking will clear it automatically Vertical bars appear to flicker jitter or shimmer on the image Adjust the phase function and then adjust the clock function Auto tracking will clear it automatically Auto ...

Page 19: ...Connecting a PC TV VCR Sound level is too low Check the volume level If the volume is still too low after turning the control to its maximum check the volume control on the computer sound card or software program Refer to your computer sound card or software documentation Sound is too high pitched or too low pitched Adjust the treble and bass to appropriate level TV signal is not received Ensure t...

Page 20: ...level Check IC803 4 DC12V level Check IC800 4 DC5V level Check replacement panel Replacement power cord Check CN70M 1 2 3 DC24V Check IC801 5 6 7 8 DC24V Check replacement IC806 Check replacement IC804 Replacement power B D Replacement IC803 Check IC801 Replacement IC800 NO NO NO NO NO NO NO YES YES YES YES YES YES YES ...

Page 21: ...ey control No LED key control Check CN01M pin spec check Check replacement OSD key Check IC001 2 3 7 35 pulse check OSD PCB short check OSD cable check IC800 4 DC5V level check Replacement U com IC001 Replacement OSD PCB or cable NO NO NO YES YES ...

Page 22: ... 22 Model No LCT 20CVST Version 1 0 EXPLODED VIEW ...

Page 23: ... 23 Model No LCT 20CVST Version 1 0 ...

Page 24: ... 24 Model No LCT 20CVST Version 1 0 ...

Page 25: ... 25 Model No LCT 20CVST Version 1 0 ...

Page 26: ... 26 Model No LCT 20CVST Version 1 0 ...

Page 27: ... 27 Model No LCT 20CVST Version 1 0 ...

Page 28: ... 28 Model No LCT 20CVST Version 1 0 ...

Page 29: ... 29 Model No LCT 20CVST Version 1 0 ...

Page 30: ...BHS M3x5 4 2 4 TTB TT 3x8 6 3 1 Main PCB 1 3 2 Speaker ass y 1 3 3 PTS TT 4x8 8 3 4 BMS 4x6 4 4 1 Power lips 1 4 2 Signal cable 1 4 3 BMS 4x6 4 5 1 EMI cover 1 5 2 Tuner PCB 1 5 3 Tuner cable 4 5 4 Lips cable 1 5 5 BMS M3x6 2 5 6 BTS TT 3x6 10 6 1 Rear cover 1 6 2 PTS TT 4x10 8 6 3 Tuner cover 4 6 4 WPTS TT 4x8 1 7 1 Base cover 1 7 2 Metal base 1 7 3 BTS TT 3x8 6 7 4 Hinge body 1 7 5 Base cover F ...

Page 31: ... 31 Model No LCT 20CVST Version 1 0 No Part name Qty 7 6 BHM M3x6 2 7 7 BHM M4x10 SEMS 4 7 8 Base cover R 1 7 9 BHM M3x6 1 8 1 Stand ass y 1 8 2 PMS M4x12 SEMS 4 8 3 Hinge cover 1 ...

Page 32: ... 32 Model No LCT 20CVST Version 1 0 CIRCUIT DIAGRAM BLOCK DIAGRAM PAL ...

Page 33: ... 33 Model No LCT 20CVST Version 1 0 BLOCK DIAGRAM NTSC ...

Page 34: ... 34 Model No LCT 20CVST Version 1 0 POWER ...

Page 35: ... 35 Model No LCT 20CVST Version 1 0 U COM ...

Page 36: ... 36 Model No LCT 20CVST Version 1 0 AD9883 ...

Page 37: ... 37 Model No LCT 20CVST Version 1 0 VPC3230 ...

Page 38: ... 38 Model No LCT 20CVST Version 1 0 SCALER ...

Page 39: ... 39 Model No LCT 20CVST Version 1 0 MEMORY ...

Page 40: ... 40 Model No LCT 20CVST Version 1 0 SOUND IC ...

Page 41: ... 41 Model No LCT 20CVST Version 1 0 SOUND AMP ...

Page 42: ... 42 Model No LCT 20CVST Version 1 0 TTX CAPTION ...

Page 43: ... 43 Model No LCT 20CVST Version 1 0 LVDS ...

Page 44: ... 44 Model No LCT 20CVST Version 1 0 KEY CONTROL ...

Page 45: ... 45 Model No LCT 20CVST Version 1 0 TUNER ...

Page 46: ......

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