LCD TELEVISION SERVICE MANUAL CHASSIS LS03
Contents
1. NO 7 Is U4 U6 U7 output Connect the wire port voltage normal again NO YES Check U4 U6 U7 Check each supply power pins voltage of Outside circuit U4 U6 U7 output to U22 are correct or not YES NO y Change U22 1 check peripheral parts of supply power pin 2 check the soldered joint is OK or not 22 2 Have sound no picture indicator light work normally indicator light work but black screen when pressing down the power supply or off Observe back lamp 15 on YES U4 U6 U7 output voltage is normal or not NO Check inverter supply power voltage and connect line NO Y Check U4 U6 U7Outside circuit YES Check each supply power pins voltage of U4 U6 U7 output to U22 are correct or not YES i Change U22 23 1 check peripheral parts of supply power pin 2 check the soldered joint is OK or not 3 White screen The reason of the troubleshoot is the signal electrode electrode haven t working voltage The TFT is always in transparent condition so the whole screen is in white raster LCD of screen socket CON3 CON4 on main board is normal or not NO YES Check Q5 US L6 L7 L8 Check the soldering of etc related parts Screen socket on main board is OK or2. 81 111 112 114 119 126 128 2 TDA9886 introduction The 9885 is an alignment free multistandard PAL NTSC vision and sound IF signal PLL demodulator for negative modulation only and FM processing The TDA9886 is an alignment free multistandard PAL SECAM and NTSC vision and sound IF signal PLL demodulator for positive and negative modulation including sound AM and FM processing FEATURES 5 V supply voltage Gain controlled wide band Vision Intermediate Frequency VIF amplifier AC coupled Multistandard true synchronous demodulation with active carrier regeneration very linear demodulation good intermodulation figures reduced harmonics and excellent pulse response Gated phase detector for L and L accent standard Fully integrated VIF Voltage Controlled Oscillator V CO alignment free frequencies switchable for all negative and positive modulated standards via I2C bus Digital acquisition help VIF frequencies of 33 4 33 9 38 0 38 9 45 75 and 58 75 MHz 4 MHz reference frequency input signal from Phase Locked Loop PLL tuning system or operating as crystal oscillator VIF Automatic Gain Control AGC detector for gain control operating as peak sync detector for negative modulated signals and as a peak white detector for positive modulated signals External AGC setting via pin OPI Precise fully digital Automatic Frequency Control AFC detector with 4 bit digital to analog conv
3. LVDS digital TFT LCD modules MST718 FEATURES Video Decoder Supports NTSC PAL and SECAM video input formats 220 NTSC and PAL comb filter for Y C separation of CVBS input Multiple CVBS and S video inputs Supports Closed caption and V chip Supports Teletext 1 5 ACC AGC and DCGC Digital Chroma GainControl Analog Input Supports RGB input format from PC camcorders and GPS Supports YCbCr inputs from conventional videosource and HDTV Supports SCART RGB Fast Blank Supports video input 4801 480p 5761 576p 720p 10801 RGB input resolution in 640x480 800x480 800x600 1024x768 and 1280x1024 SXGA _3 channel low power 10 bit ADCs integration for YCbCr and RGB Supports RGB composite sync input CSYNC SOY SOG HSYNC and VSYNC On chip clock synthesizer and PLL Auto position adjustment auto phase adjustment auto gain adjustment and auto mode detection Color Engine Brightness contrast saturation and hue adjustment 9 tap programmable multi purpose FIR Finite Impulse Response filter Differential 3 band peaking engine Vertical peaking Spatial noise reduction Luminance Transient Improvement LTT Chrominance Transient Improvement CTI Black Level Extension BLE White Level Extension WLE Favor Color Compensation FCC 3 channel gamma curve adjustment Independent 6 color of saturation hue and brightness control Scaling Engine Panel Interface Supports digital panels up to 1366x7
4. Red channel Output 4 LVDS A Link Channel 88 Waar o ROUTT 3 L Output Red channel Output 3 LVDS A Link Negative 87 ECCE Tr RN ROUT 2 L Output Red channel Output 2 LVDS A Link Positive Differential Clock Output ull ROUT 1 L Output Red channel Output 2 LVDS A Link Channel 85 3 Negative Differential Data Output 18 ROUTT OJ L Output Red channel Output 0 LVDS A Link Channel 84 Waar esie bee Ou _ External OSD Interface OSDR GPI w P30 5V toleran t OSDG GPI I O w O P31 5V toleran t OSDB GPI I O w O P32 5V toleran t External OSD R channel Input General Purpose Input Output 4mA driving strength External OSD G channel Input General Purpose Input Output 4mA driving strength External OSD B channel Input General Purpose Input Output 4mA driving strength I O w P33 5V toleran External Fast Blank Input General Purpose I Input Output 4mA driving strength Switching Power and PWM Interface PWMOUT2 Switching Pulse Output for DC DC Converter FB2 Analog Input Error Voltage Feedback Input Pin for 39 PWM2 voltage 1 2V SENSE2 Analog Input Sense Circuit Connection for PWM2 PWMOUTI Switching Pulse Output for DC DC Converter 1 Analog Input Error Voltage Feedback Input Pin for 42 PWMI voltage 1 2V SENSEI Analog Input Sense Circuit Connection for PWM1 PGOOD Power Good Indicator Interna
5. corresponding standard physical resolution digital color signal and corresponding sync clock signal to TFT control the TFT to display image correctly 4 TV power supply system L44 mW Inverter Ul U15 Eum DEBE s 33V U2 ull OVA M U4 05 5V DC Vcc Panel Panel On Off L11 U22 AA 9MC 5V msr L16 U22 mean Ei y 07 115 25y UI Qn Off U6 US 8 18 5 The location of main components and socket on mainboard and definition a A Uu Un BER i Pel B E Socket definition NO Name Connect object Function description 1 Connect outside SCART signal input 2 Connect outside HD audio input 3 Connect outside HD YPbPr input 4 Connect outside VGA input 5 Connect outside VGA audio input 6 Connect adapter outside power 7 Connect inside supply power board module 8 Connect display screen 9 Connect display screen 10 MST718 debug socket Not used 11 Connect remote control Look circuit diagram receiving board the fifth pin is 3 3V 12 Connect TV K board Look circuit diagram the second pin is 3 3V 13 Connect speaker 14 Connect speaker 15 Connect earphone output board 16 Connect inverter 12V 12V backlight switch GND GND GND Description of Main component No Name Element Function
6. input modes Demodulator SCART SCART only and PS three stereo outputs Loudspeakers Headphone and SCART e High end audio DAC e S PDIF output for connection with an external amplifier decoder e Internal multiplexer for the S PDIF output to share the internal S PDIF output and the S PDIF output generated by the external decoder of the digital broadcast 9 149 e Specific stand by mode Loop through e Control by PC bus two PC addresses e System PLL and Clock Generation using either a single quartz oscillator or a differential clock 4 1517 introduction The TDA1517 is an integrated class B dual output amplifier in a plastic single in line medium power package with fin SIL9MPF a plastic rectangular bent single in line medium power package with fin RBS9MPF or a plastic heat dissipating dual in line package HDIP18 The device is primarily developed for multi media applications FEATURES Requires very few external components High output power Fixed gain Good ripple rejection Mute standby switch AC and DC short circuit safe to ground and VP Thermally protected Reverse polarity safe Capability to handle high energy on outputs VP 0 V No switch on switch off plop Electrostatic discharge protection TDAI517 pin function SYMBOL PIN DESCRIPTION INVI 1 non inverting input 1 SGND 2 signal ground SVRR 3 supply voltage ripple rejection output OUTI 4 o
7. not YES NO Switch md Source use the oscillograph to check Patch solder the signal input or not YES NO Check PCB copper Check U22 peripheral connect line circuit is normal or not change the trouble parts 24
8. specific PC programming is required It offers various audio processing functions such as equalization loudness beeper volume balance and surround effects It provides a cost effective solution for analog and digital TV designs The STV82x7 is perfectly suited to current and future digital TV platforms based on audio video digital chips STD2000 DTV100 platform and the future WorldWide iDTV one chip which include an internal digital decoder MPEG Dolby Digital In the case where a Dolby Digital decoder is embedded in the audio video digital chip Virtual Dolby Digital could be obtained For the CTV100 120 platform the device is offered as an alternative solution to the first generation chassis that uses the STV82x6 Features e Single audio source processing IF source and or analog stereo input SCART one digital source with a maximum of 6 synchronous channels 5 1 is obtained across three PS e SIF input signal with Automatic Gain Control AGC e Digital Demodulator with automatic standard detection and demodulation for AM FM mono FM 2 carriers German or Korean FM 2 carrier and NICAM Analog matrix with five external inputs four SCART inputs 2 VRMS capable one analog mono input 0 5 VRMS one internal input from a digital matrix via a DAC three external outputs 2 VRMS capable one internal output for the digital matrix using an internal ADC e Digital matrix with three
9. 68 and 1440x900 Supports single dual 8 bit LVDS panel outputs Supports 8 bit TTL panel output Supports various displaying modes Supports horizontal panorama scaling Miscellaneous Built in MCU _3 wire serial bus interface for configuration setup Built in step down PWM circuits for input 2 5V Built in internal OSD with 512 programmable fonts 1 2 or 4 bit per pixel color 16 color palettes and 12 bit color resolution Supports external OSD Support CVBS out Spread spectrum clocks Optional 3 3V 5V output pads with programmable driving current 128 pin PQFP package MST718 pin function Analog Interface vw CAMP CVBS YC Mode Clamp Voltage Bypass 3 rM Infemal ADC Bottom Decoupling Pin 4 Rere imema ADC Top De coupling Pin 5 PRINM analog input om Ground for Analog Pr Input of ua PBINP Analog Input Analog Pb Input of HDTV for Analog Pb Input of PBINM alow lipu m Ground for Analog Pb Input o Analog Input Sync on Y slicer input Analog Input Analog Y Input of HDTV YINM Reference Ground for Analog Y Input of 1 Analog Input HDTV Analog Input Analog B Input of VGA BINM SOGIN GINP GINM RINP RINM CIINP CIINM Analog Input Reference Ground for Analog Chroma Input of TV S Videol Analog Composite Input of TV CVBS4 for Analog B Input of Aios ioni v E Ground for Analog B Input o Analog Input Syn
10. LCD TELEVISION SERVICE MANUAL CHASSIS 1 503 Please read this manual carefully before service 1 CONTENTS Part Specification feature and Composition Part Function introduction about the main integrated circuit Signal Processing Flow chart eee PartIV Typical troubleshooting processing flowchart Annex Circuit schematic diagram Part Specification feature and Composition I Main feature 1 Radio frequency input It can receive CATV signal 2 AV input Convenient for watching a DVD player VCR pickup camera or other playback devices 3 Scart input Convenient of receiving a high quality component signal from a DVD player 4 YPbPr input Capable of receiving the high definition YPbPr signal in 480i 480P 5761 576P 720P 10801 and 1080P formats 5 Scart output 6 VGA input a Convenient to connect with a host computer b Use as a data display terminal c Connect the 3 5mm diameter audio jack to your computer s soundcard to listen to stereo sound transmitted from your home computer 7 Program amp child lock function Capable of locking any program of the TV and the function button of the front panel 8 Timer function 9 Blue background with noise reduction In AV Scart and YPbPr modes screen displays soft blue background if there is no signal input 10 Multi Language on screen display menu Text and graphical user interface m
11. akes the menu operation user friendly 11 Power energy Saving mode power management mode When used as PC display terminal without PC signal output the LCD TV will automatically power off within 30 Seconds and enter Power Energy Saving Mode It will automatically startup again when it receives a signal from the PC To start the TV manually with no signal press the number buttons or 1 P 1 P on the remote control 12 Plug and play No additional software is needed when the product is used as computer terminal display 13 Automatic picture s quality adjustment 14 No flicker no radiation greenness and health 15 Auto on as time is set 16 Zoom mode for19 22 Full screen 16 9 cinema Subtitle 17 Legerity convenient low power consumption 18 Picture quality enhancement function Dynamic skin color correct improve distort color in picture make it near to real color Black level extension darken the large part of black section to enhance pictures contrast in the dim background Color edge adjustment increase the steep of color signal edge make the edge of color transition more clearly Brightness edge adjustment increase edge gradient of brightness signal make the edge of picture more clearer 19 Super definition display panel 20 Dynamic comb filter 21 Headphones output not conclude 02 series 22 8 page teletext Circuit composition of the TV The Europe LS03 chassis LCD TV is composed of regulating voltage Circuit i
12. amp Unit of TFT module so the user can see the image on TFT Part Function introduction about the main integrated circuit I Main ICs and components Serial Name model Main function number 1 U4 MP1430DN LF Z Liner voltage IC 2 U8 PISV330SQEX Video switch 3 U9 24LC21AT SN EEPROM save display parameter information 4 U23 24LC32AT SN EEPROM save user control information 5 U11 STV 8217 Audio processor 6 U15 TDA1517P Audio power amplifier 7 U19 TDA9886TS V4 single and multistandard alignment free IF PLL demodulators 8 U17 TDA5 E2I21RW2 RF tuner 9 U22 MST718BE LF Processor with Video Decoder II The function introduction of main IC 1 The MST718BE is a high quality ASIC for NTSC PAL SECAM LCD TV application It receives analog NTSC PAL SECAM CVBS and S Video inputs from TV tuners DVD or VCR sources including weak and distorted signals as well as analog RGB input from GPS systems Automatic gain control AGC and 10 bit 3 channel A D converters provide high resolution video quantization With automatic video source and mode detection users can easily switch and adjust variety of signal sources Multiple internal adaptive PLLs precisely extract pixel clock from video source and perform sharp color demodulation Built in line buffer supports adaptive 2 D comb filter 2 D sharpening and synchronization stabler in a condense manner The output format of MST718BE supports 8 bit TTL or
13. c on Green slicer input Analog Input Analog G Input of VGA Reference Ground for Analog G Input of GA Analog Input Analog R Input of VGA Input of Anaise input Ground for Analog R Input o 20 Analog Input Analog Chroma Input for TV S Videol Analog Composite Input of TV CVBS4 N N N Composite Input of TV CVBS3 YSIINM Analog Input Reference Ground for Analog Luma Input of 25 TV S Videol Analog Composite Input of TV CVBS3 Reference Ground for Analog Chroma Input C2INM Analog Input of TV S Video2 YS2INP Analog Input Analog Luma Input of TV S Video2 Reference Ground for Analog Luma Input of 2 YS2INM Analog Input TV S Video CVBSIP Analog Input Analog Composite Input for TV CVBSI CVBSIM Analog Input Reference Ground for Analog Composite o eS mE CVBS2P Analog Input Analog Composite Input for TV CVBS2 Reference Ground for Analog Composite BS2M Analog Input Input of TV CVBS2 Pin Type VREXT CDAC Analog Input Reference Current Generator 820 ohm to Ground HSYNCINI Schmitt Trigger HSYNC Composite Sync for VGA Input w Input 1 5V tolerant VSYNCINI Schmitt Trigger VSYNC for Input 1 Input w 5V tolerant HSYNCIN2 Schmitt Trigger HSYNC Composite Sync for VGA Input w Input 2 5V tolerant VSYNCIN2 Schmitt Trigger VSYNC for Input 2 Input w 5V tolerant Digital Panel Output Interface HSYNCO Output HorizontalSyncOutpu
14. description A 017 5 2121 2 RF input IF output B U11 STV82x7 Audio processor C U14 Ams1117 1 8 Low dropout voltage regulator E 015 1517 Audio power amplifier F U20 K3953M IF Filter for Video Applications G 018 K9656M IF Filter for Audio Applications H 019 TDA9886 Analog signal processor I U8 P15V330 Video switch G U13 Ams1117 3 3 Low dropout voltage regulator K U2 7808 THREE TERMINAL POSITIVE VOLTAGE REGULATORS L U22 MST718BE AD converter and format transformer M U9 24C21 EEPROM save display parameter information 20 N U24 PS25LV040 Serial Flash Memory U23 24C32 EEPROM save display parameter information P U4 MSP1430 Liner voltage IC Q U7 Ams1117 2 5 Low dropout voltage regulator R U6 Ams1117 3 3 Low dropout voltage regulator S U5 4435 9435 ARX4435 Transceiver for Macair H009 Specification T Ul IRF7314 HEXFET Power MOSFET 21 PartlV Typical troubleshooting processing flowchart Typical troubleshooting flowchart 1 Noanything haven t sound haven t picture haven t indicator light and no respondence to key remote control No answer no respondence to key and remote control button Is outside adapter or NO inside YES output 12V normal SEDI The connection of adapter Main board and key board remote control board is reliable or not
15. erter AFC bits readable via I2C bus TakeOver Point TOP adjustable via I2C bus or alternatively with potentiometer Fully integrated sound carrier trap for 4 5 5 5 6 0 and 6 5 MHz controlled by FM PLL oscillator Sound IF SIF input for single reference Quasi Split Sound QSS mode PLL controlled SIF AGC for gain controlled SIF amplifier single reference QSS mixer able to operate in high performance single reference QSS mode and in intercarrier mode switchable via I2C bus AM demodulator without extra reference circuit Alignment free selective FM PLL demodulator with high linearity and low noise 2C bus control for all functions 2C bus transceiver with pin programmable Module Address MAD Four I2C bus addresses via MAD TDA9886 pin function SYMBOL PIN DESCRIPTION 13 VIF differential input 1 VIF differential input 2 FM PLL for loop filter audio output tuner AGC TakeOver Point TOP for resistor adjustment I2C bus data input and output I2C bus clock input sound intercarrier output and MAD select with resistor SIF differential input 1 and MAD select with resistor SIF differential input 2 and MAD select with resistor not connected not connected output port 1 open collector 3 STV82x7 introduction The STV82x7 is a multistandard TV sound demodulator and audio processor This chip performs automatic multistandard analog TV stereo sound identification and demodulation no
16. l MCU Interface with Serial Flash Memory Pin Pin T Functi ee fein Pin Analog Input SAR Low Speed Bp Input 0 Ow S 3 Spp Oups SPmeeeDaudn GPIO I O w 5V tolerant General Purpose Input Output 4mA driving strength Input for IR Receive SDA I O w 5V tolerant 3 Wire Serial Bus Data 6 Input w 5V tolerant 3 Wire Serial Bus Clock Input tol t i nput w 5V toleran Power On Reset Signal Chip Selection for 3 wire Serial Misc Interface Pin Type RESET Schmitt Trigger Hardware Reset active high Input w 121 Analog Input Crystal Oscillator Input XOUT Analog Output Crystal Oscillator Output GPIO P24 Output General Purpose Input Output 4mA PWMD3 driving strength Pulse Width Modulation Output 4mA driving strength GPIO P25 Output General Purpose Input Output PWMD4 4mA driving strength Pulse Width Modulation Output 4mA driving strength Pulse Width Modulation Output pope 4mA driving strength Pulse Width Modulation Output tput 1 COM 4mA driving strength INT OUT Mode Detection Interrupt Output CVBSOI Analog Composite Output for CVBSO2 TV CVBSI CVBS2 cuc MCUSEL Input Embedded MCU selection 0 MCU on 1 MCU off Power Pins unas sans Fexim r fa AVDD MPLL 2 5 Power MPLL Power VDDC 2 5V Power Digital Core Power 50 110 Power GND Ground Ground 1 36 45 51 69
17. nverter Circuit RF circuit video enhancement circuit video Processing circuit Power amplifier circuit VGA circuit system control circuit and key control circuit The block diagram of circuit composition is below RF Input TDA9886 Video signal Slect input E e gt x A To panel MST718BE Video signpl Slect input P15V330 Adad AGH mdu copia Audio signal Slect input mdu opne Add A TDAISI7 Loudhailer Earphone m En 22 A amp M 4 PCB assembly introduction the Signal Processing are in Main board 1 Main board assembly Main board Module is the main part of Signal Processing in LCD TV The input signal is converted into uniform digital signal which can be identified by TFT under the control of system control circuit 2 Key board assembly It is composed of 7 function keys the user can operate the LCD TV conveniently by using this assembly 3 Remote control receiving board assembly It is composed of a work indicator light and a remote receive head The user use the remote control box by this module can operate the LCD TV conveniently and know the LCD TV work condition 4 Earphone output board assembly not conclude 02 series It is composed of a earphone outlet user can Listen by earphoneconveniently 5 Inverter board assembly include inverter circuit The function of the inverter is supply power to light tube in TFT and lighten the back l
18. t 80 Blue channel Output 7 LVDS B Link Channel 108 0M 0 Negative Differential Data Output OP 0 Positive Differential Data Output BOUT 5 LVB Output Blue channel Output 5 LVDS B Link Channel 106 1M 1 Negative Differential Data Output BOUT 4 LVB Output Blue channel Output 4 LVDS B Link Channel 105 IP 1 Positive Differential Data Output 2M 2 Negative Differential Data Output BOUT 2 LVB Output Blue channel Output 2 LVDS B Link Channel 103 2P 2 Positive Differential Data Output BOUTL I LVB Output Blue channel Output 1 LVDS B Link Negative 102 CKM Differential Clock Output BOUT O LVB Output Blue channel Output 0 LVDS B Link Positive 101 CKP Differential Clock Output Output Green channel Output 7 LVDS B Link Channel 3 Negative Differential Data Output OUT 6 LVB Output Green channel Output 6 LVDS B Link Channel 3 Positive Differential Data Output OUT 5 4 Green channel Output 5 4 97 96 96 Tuae Page unten ESL LVAOM Channel 0 Negative Differential Data POM GOUTDJ Green channel Output 2 LVDS A Link LVAOP Channel 0 Positive Differential Data Output GOUT 1 Output Green channel Output 1 LVDS A Link LVAIM Channel 1 Negative Differential Data Output GOUTT 0 Output Green channel Output 0 LVDS A Link 92 ROUTT S L Output Red channel Output 5 LVDS A Link Channel ERR Noite beetle ouput ROUT 4 L Output
19. utput 1 PGND 5 power ground OUT2 6 output 2 VP 7 supply voltage M SS 8 mute standby switch input INV2 9 non inverting input 2 Partlll Signal Processing Flow chart This chapter mainly introduces analog signals process video intensify process TV system control process TV supply system 1 IF RF process Completed by TAF5 E2121 RW2 RF tuner output IF signal The Function of RF tuner is below Pin symbol function 1 Auto gain control voltage 2 TU The TV do not connect 3 ADD ground 4 SCL I2C bus clock 5 SDA I2C bus data 6 BM 5 power supply 7 BM 5 power supply 8 NC Not connected 9 BTL 32 power supply form 0 32V tune voltage 10 NC Not connected 11 IF IF signal output 2 Image and sound process TDA9886 chip receives the IF signal separated from SAW filter detects and decodes Output CVBS analog signals from the 17 pin Output TV SIFP signal from 12 CVBS analog signals is decoded inside of MST718BE chip TV SIFP signal is decoded inside of STV82x7 chip then output the main channel L audio signal from 28 29 pin 3 Digital signal process The MST718BE receives analog NTSC PAL SECAM CVBS and S Video inputs It finishes the pixels ratio converting of input video signal the image auto optimization process then process via memory buffer scaler chroma matrix circuitm chroma look up table chroma space gain etc Output
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