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akira LCT-20CHST Service Manual

Chassis: ls-07
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Summary of Contents for akira LCT-20CHST

  • Page 1 LCT TV Service Manual...
  • Page 2 -2 - Model No.: LCT-20CHST Version: 1.0...

  • Page 3: Table Of Contents

    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 WIRING DIAGRAM ..........................47 EXPLODED VIEW..........................48 PART LIST ............................. 49 Model No.: LCT-20CHST Version: 1.0...

  • Page 4: Specification And Feature

    As the Terminal display Equipments of computer, it can connect with computer conveniently. It can connect with Computer audio card by its own Audio connection line ,so you can listen the audio information from computer. Model No.: LCT-20CHST Version: 1.0...
  • Page 5 Auto identify and demodulate IGR, and decode NICAM digital accompanying sound. p. Zoom image function Support follow zoom function: Full screen mode, 4:3 mode (16:9 TFT), 16:9 (4: 3 TFT), Movie mode, Sub-title movie mode. q. Light weight, small dimension, low power consumption Model No.: LCT-20CHST Version: 1.0...
  • Page 6 The Europe LS07 chassis LCD TV is composed of Steady voltage circuit、inverter Circuit, RF circuit, video Strengthen circuit, video Processing circuit, Power Enlarge circuit, VGA circuit, system control circuit and key control circuit. The block diagraph of circuit Constitute is below: Model No.: LCT-20CHST Version: 1.0...
  • Page 7 -7 - Model No.: LCT-20CHST Version: 1.0...
  • Page 8 Inverter board module (include inverter circuit) The function of the inverter is supply power to light tube in TFT and lighten the back lamp Unit of TFT module, so the user can see the image on TFT. Model No.: LCT-20CHST Version: 1.0...

  • Page 9: The Function Introduction Ls07 Chassis Lcd Tv's Main

    Support H/V sync, composite sync, green composite sync input, and detect automatically by itself Programmable 10 bit Gamma correct, the brightness and contrast is adjustable 8 color, 256 Character OSD Built-in DDC circuit inside Low standby power Support TTL, double LVDS signal output, Software switch Model No.: LCT-20CHST Version: 1.0...
  • Page 10 Analog green signal input channel 1 SOGIN1 Green sync signal input channel 1 BIN1M Analog blue signal input channel 1 regrounding voltage BIN1 Analog blue signal input channel 1 REXT Outside connect 390Ω with 3.3V Model No.: LCT-20CHST Version: 1.0...
  • Page 11 129, 139, 151 19, 102, 114, 142 VDDC Digital circuit power supply 1, 9, 20, 21, 37, 42, 45, 51, 57, 59, 76, 81, 89, 100, 101, Digital circuit ground 112, 113, 130, 140, 141, 152 Model No.: LCT-20CHST Version: 1.0...
  • Page 12 4 CVBS or 3 Y/C input, 1 CVBS output, 2 YcrCb/2 RGB input 4 AV audio input, 1 AV adjustable audio volume output Volume auto level control circuit Global FM demodulation Picture quality enhancement of dynamic peak value control, skin color correct, Gamma correct, Black level extension. Model No.: LCT-20CHST Version: 1.0...
  • Page 13 Vertical sync output VIFIN1 VIFinput 1 VIFIN2 VIFinput 2 Outside connect vertical ramp capacity IREF Recurrent input GNDIF IF grounding SIFIN1 SIF input 1 SIFIN2 SIF input 2 AGCOUT Tuner RF AGC control voltage output Model No.: LCT-20CHST Version: 1.0...
  • Page 14 Main channel right track output AUDOUTHPL Earphone channel left track output AUDOUTHPR Earphone channel right track output CVBS/PIP CVBS/PIP output Scan modulate output FBISO Flyback input/sandcastle output or composite H/V timing output HOUT Horizontal sync signal output Model No.: LCT-20CHST Version: 1.0...
  • Page 15 Remote control signal input P10/INT1 DPF clock line P11/T0 DPFdata line VDDC2 +1.8V VSSC2 Grounding P04/12SWS MST reset signal P03/12SCLK HD Pc select control signal P02/12SDO2 Power Amplifier standby control signal P01/12SDO1 TV_DPF select control signal Model No.: LCT-20CHST Version: 1.0...
  • Page 16 DVD key-press signal input P33/ADC3 TV key-press signal input VSSC Grounding P24/PWM3 Background control signal output P25/PWM4 SAW filter control signal VDDC3 +1.8V VSSC3 Grounding P12/INT2 MST interrupt signal input P14/RX MST data line P15/TX MST clock line Model No.: LCT-20CHST Version: 1.0...
  • Page 17 -17 - TDA15021H inside block diagram Model No.: LCT-20CHST Version: 1.0...
  • Page 18 V signal output V signal output U signal output U signal output Ground Ground Luminance output Y signal input Supply voltage Supply power SCAVEM output Scan velocity modulate output Not connected Grounding Not connected Grounding Model No.: LCT-20CHST Version: 1.0...
  • Page 19 -19 - TDA9178 inside block diagram: Model No.: LCT-20CHST Version: 1.0...
  • Page 20 Not connected 15, 16 Supply voltage ＋12V power supply Mode select switch Work mode select Inverting input Reverse input terminal （connect capacitor to ground ） 1, 2, 4, 6, 7, 10, Ground 11, 14, 19, 20 Model No.: LCT-20CHST Version: 1.0...
  • Page 21 -21 - TDA1517 inside block diagram: Model No.: LCT-20CHST Version: 1.0...

  • Page 22: Signal Processing Flowchart

    Further, AV, S-Video, YC signal of inside DVD (some types of TV have not) is also decoded inside of UOC chip, switch internal UOC with TV input and output a RGB color analog signal, send it to back-end process. Model No.: LCT-20CHST Version: 1.0...
  • Page 23 VCC5A: +5V power supply software can turn off V3_3D:UOC digital part supply power supply V1_8V1:UOC digital part constant supply power supply V1_8V2:UOC digital part power supply can be turned off V2_5M:MST518 digital core supply power supply V3_3M:MST518 supply power supply Model No.: LCT-20CHST Version: 1.0...
  • Page 24 . 3V PWRON VDPLL VCC5_SW Filter IRF7316 LM 1117_2 V2.5M Filter VCC5 . 5V V3_3D V1_8V1 NPC1117D NCP1117 V1_8V2 NTMS10 P02R FB39 V3_3M VLCD FB40 NTMS10 VCC5 P02R FB41 TO DPF OR DVD LM2596- C294 Model No.: LCT-20CHST Version: 1.0...
  • Page 25 - 25 - 5. The main element in main board and location of socket and definition Model No.: LCT-20CHST Version: 1.0...
  • Page 26 Connect display screen（TTL LG 20”, 17” screen） MST518 debug socket Supply DVD or DPF power Look circuit diagram, the first, second, third pin are 3.3V Connect inverter +12V, +12V, poor light switch, GND, DND, GND Model No.: LCT-20CHST Version: 1.0...
  • Page 27 LM2596-5.0 Linear voltage IC LM2596-5.0 Linear voltage IC NTMS10P02 MOS switch TDA1517AWT Audio power amplifier TDA1517AWT Audio power amplifier 24LC32A EEPROM(store user control information) Si2311DS MOS switch IRF7316 MOS switch 24LC21A EEPROM(store display parameter information) Model No.: LCT-20CHST Version: 1.0...
  • Page 28 . C h an g e U 2 2 、 ch eck th e jo in tin g is O K o r n o t. Model No.: LCT-20CHST Version: 1.0...
  • Page 29 Check U13、U22 which output from U13、U22 to U2 is Outside circuit normal or not? One pin no voltage 1、check supply power pin outside Change U2 parts of an apparatus 2、check the jointing is OK or not Model No.: LCT-20CHST Version: 1.0...
  • Page 30 OK or not? apparatus Switch signal source,use the oscillograph to check the signal input Patch jointing or not Check PCB copper aluminium Check U2 outside circuit is normal or connect line not ,change the fault ones. Model No.: LCT-20CHST Version: 1.0...
  • Page 31 OK or not normal normal normal Check FB1、FB2、FB3、 Check U2 outside Check the output of 85th、 circuit is normal or FB4、FB5 inductance are 86th、87th pin of U2 not,change fault ones normal or not Model No.: LCT-20CHST Version: 1.0...
  • Page 32 Example 1: Can’t turn on the TV Troubleshoot phenomenon: After connect power supply and turn on the power supply , the “AKIRA” logo will not appear on screen. Press the key or use the remote control, the TV has no reflect, no display and black screen.
  • Page 33 UOC by oscillograph, according to signal flow chat, measure R227、 R157、 U8、 C130 one by one, and observe the waveform is ok or not, find the back end of C130 have not waveform, change C130 and troubleshooting disappear. Model No.: LCT-20CHST Version: 1.0...

  • Page 34: Spare Part List And Easy Damage Part List

    JUJ6.695.002 8669500020J LTM170W1-L01 68219601701 LC171W03 68211710305 Samsung INVERTER panel groupware INV17-4505 59324125010 screen use LG screen INVERTER panel groupware INV17-6506 59324165060 Dynamoelectric speaker Y2898-01-5W-4Ω 56231105042 Remote control KLC5A(JUL2.018.351) 8201803510L Inner power supply module FSP084-1CD02C 67128084025 Model No.: LCT-20CHST Version: 1.0...
  • Page 35 LC201V02 68212010235 INVERTER panel groupware INV18-605D 59324106054 INVERTER panel groupware INV20-606A(D) 59324126061 Samsung Dynamoelectric speaker Y38106-01-5W-4Ω 56231105043 screen use Remote control KLC5A(JUL2.018.351) 8201803510L LG screen use Samsung Inner power supply module FSP084-1CD02C 67128084025 screen use Model No.: LCT-20CHST Version: 1.0...

  • Page 36: Factory Mode

    LOGO display or not BLUEBACK Blue screen switch AUTO Auto revise The fast key is the key of “title” INIT Initialization program The fast key is the key of “0” IIC BUS OPEN Open bus Model No.: LCT-20CHST Version: 1.0...

  • Page 37: Circuit Diagram

    EN_DPF_DVD CSZ_MST TV_KEY_DEC MUTE RST_MST DVD_KEY_DEC TV_VSYNC SDA_UOC SVIDEO_Y1IN SCL_UOC SVIDEO_C1IN 09_Power Supply 09_Power Supply +34V VLCD 10_VGA_UPDATE PWRON 10_VGA_UPDATE ON_PANEL UPDATE_CON ON_BACKLITE VGA_SCL EN_DPF_DVD VGA_SDA SDA_DPF DDC_SDA SCL_DPF DDC_SCL SCL_UOC SDA_UOC Title LS07-EU-LCDTV 1208.DDB Model No.: LCT-20CHST Version: 1.0...
  • Page 38 PC_VS PC_VSIN C122 47nF R153 G_GIN PB_IN R154 C123 47nF PC_BIN G_BIN 74LVC126A DVD_AUD_RIN U16D U16C R155 390 C133 SOGIN1 C146 HD_PC_SW 100pF 0: Select YPbPr PI5V330A 1: Select PC 74LVC126A 74LVC126A Title LS07-EU-CONNECTORS _EU_for_ Model No.: LCT-20CHST Version: 1.0...
  • Page 39 10nF C221 3.3K 10nF R110 SCL_UOC SCL_UOC IFGND SDA_UOC SDA_UOC +34V ECI2012K220T VCC5A C242 C244 R112 FB35 ECB2012M800T 0.1uF 4.7uF/50V R113 C147 C240 C241 C148 uPC574 0.1uF 47uF16V 47uF16V 0.1uF IN4148 R111 C239 22uF16V LS07-EU-TUNER Model No.: LCT-20CHST Version: 1.0...
  • Page 40 K9656M BA792 UOC_SIF1 Si2311DS 24LC32A R129 VCC5A IFGND DECDIG V1_8V2 FB43 C107 2N3904 C106 R119 2.2K UOC_SIF2 220nF 47uF16V FB50 C103 R126 10nF IFGND SAW_SW IFGND Title R125 LS07-EU-UOCIII TAD12021H 2N3904 IFGND IFGND IFGND U_for_M Model No.: LCT-20CHST Version: 1.0...
  • Page 41 470pF V3_3M R240 75 U10B TV_VSYNC 74LVC126A R139 4.7K TV_DPF_SW 2N3904 3.3K U10D C117 10uF16V TV_B 2N3904 R151 FB47 ECI2012M2R2KT TV_HSYNC C252 R148 C257 C258 R241 74LVC126A 22pF R150 470pF 470pF Title LS07-EU-MUX/AUDIO AMP/TDA9178 U_for_MP_ Model No.: LCT-20CHST Version: 1.0...
  • Page 42 C144 22pF R186 R189 C159 TV_DPF_RINM G_RM 47nF 47nF C157 14.318MHZ R187 R190 XOUT C160 TV_DPF_GINM G_GM 47nF C145 22pF 47nF BYPASS C158 R188 R191 C161 TV_DPF_BINM G_BM 47nF 47nF C262 0.1uF Title LS07-EU-MST518 41208.DDB Model No.: LCT-20CHST Version: 1.0...
  • Page 43 RBO0 BBO4 RBO1 BBO5 RBO2 BBO6 RBO3 BBO7 33 OHM RBO4 RBO5 PCLKO DCLK RBO6 RBO7 PDEO PVSO VSYNC PHSO HSYNC 33pF 33pF 33pF VLCD BBO[0..7] GBO[0..7] RBO[0..7] Title LS07-EU-15" 17" 20" LCD Panel 41208.DDB Model No.: LCT-20CHST Version: 1.0...
  • Page 44 OUT2A R163 C293 MODE OUT2B 2 HEA 100K SVRR 220uF16V R144 100uF16V 2.2K PGND R160 M_ROUT SGND R159 1.5K 2SA1162 PGND PGND C296 4.7nF R165 TDA1517AWT 2N3904 FB60 PGND Title LS07-EU-Sound Amplifier and Headphone 41208.DDB Model No.: LCT-20CHST Version: 1.0...
  • Page 45 NTMS10P02R C230 0.1uF C232 C231 0.1uF 100uF16V R207 VCC5 VCC5_SW R204 2.2K U11A ON_BACKLITE 2N3904 R206 3.3K ON_PANEL To Inverter 2N3904 C228 0.1uF IRF7316 R196 3.3K R242 R203 CON6 R202 2N3904 Title LS07-EU-POWER SUPPLY r_MP_2004 Model No.: LCT-20CHST Version: 1.0...
  • Page 46 DDC_SDA OUT2 CON4 VGA_SDA SCL_UOC CON2 OUT4 CON3 OUT3 DDC_SCL VGA_SCL UPDATE CON= +5V, VGA CONNECT WITH UOC MC14016BDR2 UPDATE CON= 0V, VGA CONNECT WITH DDC UPDATE_CON 4.7k 2N3904 Title LS07-EU-VGA PORT UPDATE PROGRAM 041208.DDB Model No.: LCT-20CHST Version: 1.0...

  • Page 47: Wiring Diagram

    -47 - WIRING DIAGRAM Model No.: LCT-20CHST Version: 1.0...

  • Page 48: Exploded View

    6. Check if each bottom could mark, if so, protect the four corners of the front frame with blue adhesive tape. The method is confirmed by technologist. Make sure the side with mark "O" should be forward the display panel then installing the power supply switch. Model No.: LCT-20CHST Version: 1.0...