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LCD TV

Service Manual

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Summary of Contents for LCT-17CHST

Page 1: ...LCD TV Service Manual ...

Page 2: ... 2 Model No LCT17CHST doc Version 1 0 MODEL LCT 17CHST CHASSIS INFO LS 07 ...

Page 3: ...AFETY PRECAUTION 4 MAIN FEATURE 6 ELECTRIC CIRCUIT 9 MAIN ICs FUNCTION 10 SYMPTOMS CORRECTION 24 LIST OF BREAKABLE MAINTENANCE PARTS 25 FACTORY MODE 26 EXPLODED VIEW 27 WIRING DIAGRAM 28 CIRCUIT DIAGRAM 29 WALL MOUNTING BRACKET INSTALLATION GUIDE 36 ...

Page 4: ... 4 IMPORTANT SAFETY PRECAUTION Model No LCT17CHST doc Version 1 0 ...

Page 5: ... 5 Model No LCT17CHST doc Version 1 0 ...

Page 6: ...nent video signal from such as DVD Conveniently Support format 480I 480P 576I 576P 720P 50 60HZ 1080I 50 60HZ 1080P 50 60HZ VGA input 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 Program lock and child lock function The function ...

Page 7: ...automatically Plug and play The TV works as the terminal Equipments of computer need not equip install software it is real Plug and Play Automatic correct By its automatic correct function the LCD TV can bring you the best view No Flicker no Radiation Green environmental protection Because of it s Advanced power Management mode the TV can realize standby and recall on function ACI function Auto ch...

Page 8: ...ck area of picture Raise the contrast in Dark Background Color Edge correct Increase the Steep of color signal edge make the edge of color Transition more clearly Brightness edge correct increase the steep of Brightness signal edge make the edge of picture is more clearly Super fine and inner fairness TFT 10 page teletext storage Dynamic comb filter Headphones output ...

Page 9: ...07 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 diagram of circuit Constitute as below ...

Page 10: ...7AWT Audio amplifier 3 U3 MST518 AD converter and format change 4 U2 UOC TDA15021H Video decode and MCU control 5 Q9 Si2311DS MOS switch 6 U11 U12 IRF7316 MOS switch 7 U19 NTMS10P02 MOS switch 8 U23 LM2596 5 0 Liner voltage IC 9 U1 24LC21A EEPROM save display parameter information 10 U4 24LC32A EEPROM save user control information 11 U6 U20 PI5V330A Video switch ...

Page 11: ...ble LVDS signal output Software switch MST518 Pin Function Pin Definition Pin Function CPU Interface 33 HWRESET Hardware reset high voltage enable 82 Chip select signal of three wire serial bus 83 data signal of three wire serial bus 84 SCL clock signal of three wire serial bus 85 INT interrupt 98 91 AD 7 0 Parallel bus the chassis is not used 125 BUSTYPE Bus type select Analog Interface 38 HSYNC0...

Page 12: ...tput 2 128 LVA3M LVDS output 3 127 LVA3P LVDS output 3 132 LVACKM LVDS clock signal output 131 LVACKP LVDS clock signal output 26 23 18 15 RB 7 0 TTL red signal channel 14 11 8 5 GB 7 0 TTL green signal channel 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...

Page 13: ... 13 MST518 Internal Diagram Model No LCT17CHST doc Version 1 0 ...

Page 14: ...port 4 3 16 9 display format z TOP FLOF TELETEXT 10 page receive display z Channel auto install ACI function can preset z 4 CVBS or 3 Y C input 1 CVBS output 2 YcrCb 2 RGB input z 4 AV audio input 1 AV adjustable audio volume output z Volume auto level control circuit z Global FM demodulation z Picture quality enhancement of dynamic peak value control skin color correct Gamma correct Black level e...

Page 15: ...el 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 left track audio input 54 AUDIOIN2R PC signal right track audio input 55 CVBS2 Y2 AV CVBS signal input 56 AUDIOIN3L Inside DVD module left track audio input 57 AUDIOIN3R Inside DVD module right track au...

Page 16: ...104 P02 12SDO2 Power Amplifier standby control signal 105 P01 12SDO1 TV DPF select control signal 106 P00 12SDII O Turn on control signal 107 P13 T1 MST chip select signal 108 P16 SCL UOCI2C bus clock line 109 P17 SDA UOCI2C bus data line 110 VDDP 3 3V 111 P20 TPWM Red indicator light control signal 112 P21 PWM0 Green indicator light control signal 113 P22 PWM1 TFT power supply control signal 114 ...

Page 17: ... 17 TDA15021H Internal Block Diagram Model No LCT17CHST doc Version 1 0 ...

Page 18: ...Definition Pin Function 1 Sandcastle input Sandcastle input 2 Not connected Grounding 3 ADC input 1 A D converter input 1 4 ADC input 2 A D converter input 2 5 ADC input 3 A D converter input 3 6 Luminance input Y input 7 Address selection input I2C address choose input port 8 U signal input U input 9 V signal input V input 10 Test pin Grounding 11 Serial clock input I2C bus I2C bus clock signal 1...

Page 19: ... 19 DA9178 Internal Block Diagram Model No LCT17CHST doc Version 1 0 ...

Page 20: ...ure protect circuit d low noise switch e Constant gain TDA1517 PIN FUNCTION Pin Definition Pin Function 3 Non inverting input Audio input 5 Supply voltage ripple rejection Bias circuit filter 8 9 Output Audio output 12 13 N C Not connected 15 16 Supply voltage 12V power supply 17 Mode select switch Work mode select 18 Inverting input Reverse input terminal connect capacitor to ground 1 2 4 6 7 10 ...

Page 21: ...72 pin combined with UOC to form a loop circuit 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 III Digital Signal Processes The analog RGB signal output from UOC and RGB signal output from DFP are switched and selected by a PI5V330A input it in...

Page 22: ...turned off z V2_5M MST518 digital core supply power supply z V3_3M MST518 supply power supply 2 The constitute and distributing of the TV LM2596 5 0 7805 Double voltage IRF7316 NCP1117 LM 1084_3 3V LM 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 23: ...4LC32A EEPROM store user control information M Q9 Si2311DS MOS switch N U12 IRF7316 MOS switch O U1 24LC21A EEPROM store display parameter information SOCKET AND DEFINITION ITEM NAME FUNCTION 1 PWM PWM Dimming 2 APWM Analog PWM dimming 3 ON OFF Backlight On Off 2 4 5 0V On 0 1V Off 4 GND 5 RX0 LVDS signal 6 RX0 LVDS signal 7 GND 8 RX1 LVDS signal 9 RX1 LVDS signal 10 GND 11 RX2 LVDS signal 12 RX2 ...

Page 24: ...e from DDC Display Data Channel when turning on the TV DDC is in chassis 24LC21 No picture but sound on LOGO when turning on the TV poor light is bright Check the connect line in up screen and connect the line No picture no sound no snowflake in TV condition but AV is normal Check the outside of RF also bus and power supply there is no problem but no output from RF so the RF is disabled LCD TV can...

Page 25: ...690 033 1 8669000331J Main board groupware JUJ6 690 033 6 8669000336J Remote panel groupware JUJ6 694 016 8669400160J Key press panel groupware JUJ6 694 015 8669400150J Earphone panel groupware JUJ6 695 002 8669500020J TFT LTM170W1 L01 68219601701 TFT LC171W03 68211710305 INVERTER panel groupware INV17 4505 59324125010 Samsung screen use INVERTER panel groupware INV17 6506 59324165060 LG screen us...

Page 26: ...rol after exiting from the factory mode you should turn on 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 Quick access key for Language IFPL Adjust the scale of picture and sound in the IF signal TOP Tune AGC voltage M13 Quick access key for DVD DVD Switch for DVD source DPF Switch for DPF source M17 LOGO ON...

Page 27: ... 27 EXPLODED VIEW Model No LCT17CHST doc Version 1 0 ...

Page 28: ... 28 WIRING DIAGRAM Model No LCT17CHST doc Version 1 0 ...

Page 29: ... 29 CIRCUIT DIAGRAM Model No LCT17CHST doc Version 1 0 ...

Page 30: ... 30 Model No LCT17CHST doc Version 1 0 ...

Page 31: ... 31 Model No LCT17CHST doc Version 1 0 ...

Page 32: ... 32 Model No LCT17CHST doc Version 1 0 ...

Page 33: ... 33 Model No LCT17CHST doc Version 1 0 ...

Page 34: ... 34 Model No LCT17CHST doc Version 1 0 ...

Page 35: ... 35 Model No LCT17CHST doc Version 1 0 ...

Page 36: ...it for drilling The drilling holes should conform to the specifications 7 To avoid fire and shock do NOT place radiator heater or humidifier below the installed TV 8 The TV should be kept away from moisture sensors and power line The TV should be kept away from impact and vibration 9 Ensure that the power supply be disconnected before installation for fear of fire and shock Wall mounting Installat...

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