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akira LCT-20CHST, Service Manual

The Akira LCT-20CHST is a high-quality television set with exceptional features. Ensure proper maintenance and repair with the Service Manual available for free download from manualshive.com. This comprehensive manual will guide you through troubleshooting and fixing any issues that may arise with your TV. Download your manual now for optimal performance.

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Model No.: LCT-20CHST 
Version: 1.0 

 

   

 

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Summary of Contents for LCT-20CHST

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

Page 2: ...2 Model No LCT 20CHST Version 1 0 M M Mo o od d de e el l l L L LC C CT T T 2 2 20 0 0C C CH H HS S ST T T C C Ch h ha a as s ss s si i is s s L L LS S S 0 0 07 7 7...

Page 3: ...SPECIFICATION AND FEATURE 4 THE FUNCTION INTRODUCTION LS07 CHASSIS LCD TV S MAIN 9 SIGNAL PROCESSING FLOWCHART 22 SPARE PART LIST AND EASY DAMAGE PART LIST 34 FACTORY MODE 36 CIRCUIT DIAGRAM 37 WIRIN...

Page 4: ...t CATV function Can receive 470MHZ CATV Programs can store 100 programs Program number display 0 99 b AV Audio and AV Video input In scart mode the system can automatically activate scart checking fun...

Page 5: ...ff in about 30 Seconds automatically and enter into standby condition press down Power P P Number key of Remote control or the PC signal appearance again the TV will be on automatically j Plug and pla...

Page 6: ...r Transition more clearly Brightness edge correct increase the steep of Brightness signal edge make the edge of picture is more clearly s Super fine and inner fairness TFT t 10 page teletext storage u...

Page 7: ...7 Model No LCT 20CHST Version 1 0...

Page 8: ...rom UOC is received by MST518 and accomplishes A D conversion output suitable digital color signal to drive circuit of TFT 8051 Processor inside UOC is responsible for co operation the each part of wo...

Page 9: ...p MST518 is a high performance high integration image processor which is designed for LCD it can support SXGA format 1280 1024 it integrates a group of AD converter high quality format transform syste...

Page 10: ...ference voltage 79 REFP internal ADC decouple 80 REFM internal ADC decouple 75 RIN0 Analog red signal input channel 0 74 RIN0M Analog red signal input channel 0 regrounding voltage 73 SOGIN0 Green syn...

Page 11: ...l 4 3 154 153 150 147 BB 7 0 TTL blue signal channel GPIO Interface 87 GOUT1 PWM1 PWM output 1 86 GOUT0 PWM0 PWM output 0 2 BYPASS Outside connect filter capacitor 29 DDC_DAT Analog interface DDC data...

Page 12: ...circuit good performance simple craft and etc It matched with company s high performance price ratio and high product efficiency demanding It is suitable for 4 3 or 16 9 50 60HZ and A100 120HZ TV syst...

Page 13: ...T Crystal oscillator output 12 VSSA1 Grounding 13 VGUARD SWIO Protecting voltage input or I O 14 DECDIG DECDIG signal input 15 VP1 5V 16 PH2LF The second grade horizontal phase lock filter 17 PH1LF Th...

Page 14: ...annel 49 AUDIOIN4L HD signal left track audio output 50 AUDIOIN4R HD signal right track audio output 51 CVBS4 Y4 S video luminance signal input 52 C4 S video chroma signal input 53 AUDIOIN2L PC signal...

Page 15: ...BCLIN Beam current limiter input 84 BLKIN Black current input 85 RO R basic color signal input 86 GO G basic color signal output 87 BO B basic color signal output 88 VDD3 3 3V 89 VREFAD_NEG 0V 90 VRE...

Page 16: ...power supply control signal 114 P23 PWM2 Inside DVD module power supply control signal 115 P30 ADC0 Reserve IO port 116 P31 ADC1 Earphone insert identify signal input 117 VDDC1 1 8V 118 VDD18 1 8V 119...

Page 17: ...17 Model No LCT 20CHST Version 1 0 TDA15021H inside block diagram...

Page 18: ...Pin name Function 1 Sand castle input Sand castle input 2 Not connected Grounding 3 ADC input 1 A D convertor input 1 4 ADC input 2 A D convertor input 2 5 ADC input 3 A D convertor input 3 6 Luminanc...

Page 19: ...19 Model No LCT 20CHST Version 1 0 TDA9178 inside block diagram...

Page 20: ...it is simple Mute standby is controllable Temperature protect circuit Low noise switch Constant gain TDA1517 PIN DESCRIPTION Pin Pin name function 3 Non inverting input Audio input 5 Supply voltage ri...

Page 21: ...21 Model No LCT 20CHST Version 1 0 TDA1517 inside block diagram...

Page 22: ...er supply form 0 32V tune voltage 10 NC Not connected 11 IF IF signal output 2 Image and sound process UOC chip receives the IF signal separated from SAW detect and decode Output RGB color analog sign...

Page 23: ...of input video signal the image auto optimization process then process memory buffer scaler chroma matrix circuit chroma look up table chroma space gain etc Output corresponding standard physical res...

Page 24: ...1117_2 5V U13 U11 VCC5 U18 U8 L3 C188 VCC5 32V VCC5A TO INVERTER TO TDA9178 V3_3M V2 5M V3_3D 12V VCC5_SW U14 U15 PWRON PWRON 7808 12Va NPC1117D U22 V1_8V1 U17 Fi l t er Fi l t er Fi l t er Filter VP...

Page 25: ...25 Model No LCT 20CHST Version 1 0 5 The main element in main board and location of socket and definition A 1 3 2 4 5 6 7 8 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 K E L...

Page 26: ...inside DVD signal input 11 J7 Connect inside DVD K panel Look circuit diagram the second pin is 3 3V 12 J12 Connect earphone output panel 13 J14 Connect speaker 14 J13 Connect speaker 15 J6 Connect T...

Page 27: ...nsition D U20 PI5V330A Video switch on off E U6 PI5V330A Video switch on off F U11 IRF7316 MOS switch G U9 LM2596 5 0 Linear voltage IC H U23 LM2596 5 0 Linear voltage IC I U19 NTMS10P02 MOS switch J...

Page 28: ...er or inside output 12V norm al M end or change adapter N O The connection of M ain board and key press rem ote plane is reliable or not Y ES Reset the connect lines Is U 13 U 22 output port voltage n...

Page 29: ...rve back lamp is on or off NO YES U13 U22 output voltage is normal or not Check U13 U22 Outside circuit NO YES Check each supply power pin voltage which output from U13 U22 to U2 is normal or not Chan...

Page 30: ...white raster VLCD of screen socketJ16 J17 J22 in main board is normal or not NO YES Check Q25 U19 FB39 FB40 FB41 ect parts of an apparatus Check the jointing of screen socket in main board is OK or no...

Page 31: ...or not Check U6 and i t s out si de ci r cui t i s nor m al or not Check the jointing of screen socket J16 J17 J22 in main board is OK or not the connection is OK or not TV AV condition picture differ...

Page 32: ...age display normally in non PC mode it is proved that the backend image public processing channel is ok namely U3MST518 and backend image signal processing circuit work normally In PC mode measure the...

Page 33: ...k the key press panel measure each resistance find R1 open circuit change it Example 5 The image is ok after turn on the TV but left speaker has no sound output Troubleshooting phenomenon the image is...

Page 34: ...rol KLC5A JUL2 018 351 8201803510L Power supply adapter FSP084 1CD02C 67128084025 W170F7E Material name Type module No Material code Remark Main board groupware JUJ6 690 033 1 8669000331J Main board g...

Page 35: ...are JUJ6 694 015 8669400150J Earphone panel groupware JUJ6 695 002 8669500020J Samsung screen use TFT A201SN01 68219020110 LG screen use TFT LC201V02 68212010235 INVERTER panel groupware INV18 605D 59...

Page 36: ...the TV again Now the introduction of the modes which are often used is below the others are design parameter mode not permit to modify M6 The fast key is the key of language IFPL Adjust the scale of...

Page 37: ...PWRON DVD_C2IN DVD_Y2IN DVD_AUD_LIN DVD_AUD_RIN EN_DPF_DVD MUTE TV_VSYNC SVIDEO_Y1IN SVIDEO_C1IN 04_UOCIII TDA15021H 04_UOCIII TDA15021H SANDC V_IN V_OUT Y_IN U_OUT U_IN Y_OUT SDA_UOC SCL_UOC TV_HSYN...

Page 38: ...47nF C122 47nF C123 47nF R155 390 C133 1nF SOGIN1 PC_RIN PC_GIN PC_BIN C125 0 1uF 3 2 1 14 7 U16A 74LVC126A 6 5 4 U16B 74LVC126A PC_HS PC_VS PC_HSIN PC_VSIN HD_PC_SW V3_3M 11 12 13 U16D 74LVC126A 8 9...

Page 39: ...6V C241 47uF16V C148 0 1uF R60 47 R61 47 R112 10K VCC5A IF_OUT AGC SDA_UOC SCL_UOC 34V LS07 EU TUNER C244 4 7uF 50V C242 0 1uF L5 ECI2012K220T D11 uPC574 R47 100 R105 4 7K R41 3 3K R110 100 C204 10nF...

Page 40: ...C 125 VDDC 100 VSSC 101 VDDC 117 VSSC 121 VDD3A 4 VDD3 88 VDD3A 94 GNDA 12 VCOMB 69 VSSCOMB 68 VREF 90 VSS_REF 89 GNDA 1 VADC 96 VSSADC 95 VDD18 118 VDDA 93 VDDP 110 GNDAUD 92 XIN 10 XOUT 11 VREF_SDAC...

Page 41: ...ECI2012M2R2KT C108 10uF16V C237 0 1uF C238 10uF16V C249 10uF16V C153 0 1uF C154 0 1uF FB45 ECI2012M2R2KT C253 470pF C254 470pF R137 4 7K R141 470 R138 10K C116 10uF16V R142 75 R134 75 VCC5A VCC5A TV_...

Page 42: ...M 146 DDC_CLK 30 DDC_DAT 29 DDCROM_CLK 31 DDCROM_DAT 32 LHS LVB3P 143 LVS LVB3M 144 REXT 55 RIN1 65 RIN1M 66 GIN1 63 GIN1M 64 SOGIN1 62 BIN1 60 BIN1M 61 HSYNC1 40 VSYNC1 41 GND 113 GND 130 GND 140 GND...

Page 43: ...R NC 50 NC 49 NC 48 GND 47 GND 46 VCC 45 VCC 44 VCC 43 VCC 42 GND 41 HSYNC 40 R5 31 R6 32 R7 33 GND 34 GND 36 DE 37 GND 38 VSYNC 39 DCLK 35 R4 30 G5 21 G6 22 G7 23 GND 24 R1 26 R2 27 R3 28 GND 29 R0...

Page 44: ...61 10K R156 4 7K ASTB PGND Q5 2N3904 C293 220uF16V D16 IN4148 12V 12V R144 220 R164 22K R165 33K R163 100K LS07 EU SoundAmplifierandHeadphone 1 2 3 4 5 6 J12 CON6 To Headphone R176 1K R177 3 3K Q16 2N...

Page 45: ...ON_PANEL C231 0 1uF C232 100uF16V VLCD 12V To Inverter VCC5 12V ON_BACKLITE R196 3 3K R204 2 2K C215 0 1uF C217 0 1uF R193 10K C216 0 1uF IN 1 GND 2 OUT 3 4 4 U18 MC7805CD2T 3 4 5 6 U12B IRF7316 C214...

Page 46: ...OUT3 9 OUT4 10 IN4 11 CON4 12 CON1 13 VCC 14 U24 MC14016BDR2 VCC5 C65 0 1uF R17 10k R18 4 7k UPDATE CON 5V VGA CONNECT WITH UOC UPDATE CON 0V VGA CONNECT WITH DDC VCC5 UPDATE_CON VGA_SCL VGA_SDA DDC_S...

Page 47: ...47 Model No LCT 20CHST Version 1 0 WIRING DIAGRAM...

Page 48: ...ation of certificate and breakable label is confirmed by technologist make sure the consistency of location 4 Suspending panel is covered by protective film 5 Paste insulative board onto transition as...

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