changhong global LS03 Service Manual
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10 BOUT[0]/LVB CKP Output Blue channel Output [0] / LVDS B-Link Positive Differential Clock Output 101 GOUT[7]/LVB 3M Output Green channel Output [7] / LVDS B-Link Channel 3 Negative Differential Data Output 99 GOUT[6]/LVB 3P Output Green channel Output [6] / LVDS B-Link Channel 3 Positive Differential Data Output 98 GOUT[5:4] Output Green channel Output
changhong global LS03, 15 3 PT2314 introduction Description PT2314 is a four-channel input digital audio processor utilizing CMOS Technology. Volume, Bass, Treble and Balance are incorporated into a single chip. Loudness Function and Selectable Input Gain are also provided to build a highly effective electronic audio processor having the highest performance and reliability with the least external components. All functions are programmable using the I2C Bus. The pin assignments and application circuit are optimized for easy PCB layout and cost saving advantage for audio application. Features CMOS Technolog
changhong global LS03, 16 4 LA72702NVA introduction Application US TV BTSC Decoder Characteristics With SIF circuit、alignment-free* STEREO channel separation * When Base Band signal input, separation is adjusted by input level. Dual Slave address(80h,84h) Functions SIF FM-Demodulator STEREO decoder dbx Noise Reduction STEREO detection STEREO detection sensitivity change function SAP demodulator SAP detection SAP output select 2-levels SAP detection sensitivity change function
changhong global LS03, 11 FB/GPIO_ P33 I/O w/ 5V-toleran t External Fast-Blank Input / General Purpose Input/Output; 4mA driving strength 76 Switching Power and PWM Interface Pin Name Pin Type Function Pin PWMOUT2 Output Switching Pulse Output for DC-DC Converter 38 FB2 Analog Input Error Voltage Feedback Input Pin for PWM2; voltage = 1.2V 39 SENSE2 Analog Input Sense Circuit Connection for PWM2 40 PWMOUT1 Output Switching Pulse Output for DC-DC Converter 41 FB1 A
21 4435 L32 12Vu U5 Vcc-Panel On/Off IRF7314 U1 On/Off TDA1517P U15 12VA 倍压 33V TUNER U17 7808 U2 PT2314 U16 9VA 2SC388 Q19 4435 U5 5V-DC Vcc-Panel Panel Panel On/Off L11 MST718 GMC-5V L16 MST718 PWM-5V L14 MST718 VAX-5V AMS1117.2.5 U7 L15 2.5V MST718 DPL-2.5V U22 U22 U22 U22 L10 MST718 U22 ADC-2.5V L17 MST718 U22 MPL-2.5V L13 MST718 CDAC-2.5V U22 IRF7314 U1 On/Off STV82
17 5 TDA1517 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 application
changhong global LS03, 24 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. VLCD of screen socket CON3(CON4) on main board is normal or not? Check Q5,U5,L6,L7,L8 etc related parts Check the soldering of screen socket on main board is OK or not? NO YES Switch signal source, use the oscillograph to check the signal input or not Patch solder YES NO Check PCB copper connect line Check U22 pe
changhong global LS03, 3 PartⅠ: 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、S-Video 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, 576i, 576P, 720P, 1080i formats. 5、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
changhong global LS03, 4 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 18、Super definition display panel 19、Dynamic comb filter 20、Headphones output(not include 02 series) Ⅱ. Circuit composition of the TV The LS03 chassis LCD TV is composed of regulating
changhong global LS03, 9 CVBS1M Analog Input Reference Ground for Analog Composite Input of TV CVBS1 31 CVBS2P Analog Input Analog Composite Input for TV CVBS2 32 CVBS2M Analog Input Reference Ground for Analog Composite Input of TV CVBS2 33 Pin Name Pin Type Function Pin VREXT_CDAC Analog Input Reference Current Generator, 820 ohm to Ground 116 HSYNCIN1 Schmitt Trigger Input w/ 5V-tolerant HSYNC / Composite Sync for VGA Input 1 125 VSYNCIN1 Schmitt Trigger Input w/ 5V-tolerant VSYNC for VGA Input 1 124 HSYNCIN2 Schmitt Trigger Input w/ 5V-tolerant HSYNC / Composite Sync for VGA Input 2 123 VSYNCIN2 Schmitt Tr
changhong global LS03, 2 CONTENTS PartⅠ:Specification, feature and Composition ……………………………………3 PartⅡ: Function introduction about the main integrated circuit ………………..6 PartⅢ: Signal Processing Flow chart ….………………………………………….18 PartⅣ: Typical troubleshooting processing flowchart …………………………..21 Annex: Circuit schematic diagram
changhong global LS03, 8 Pin Name Pin Type Function Pin VMID Mid-Scale Voltage Bypass 2 VCLAMP CVBS/YC Mode Clamp Voltage Bypass 3 REFM Internal ADC Bottom De-coupling Pin 4 REFP Internal ADC Top De-coupling Pin 5 PRINP Analog Input Analog Pr Input of HDTV 7 PRINM Analog Input Reference Ground for Analog Pr Input of HDTV 8 PBINP Analog Input Analog Pb Input of HDTV 9 PBINM Analog Input Reference Ground for Analog Pb Input of HDTV 10 SOY Analog Input Sync-on-Y slicer input 11 YINP Analog Input
changhong global LS03, 23 2、 Have sound no picture, indicator light work normally indicator light work, but black screen when pressing down the power supply Observe back lamp is on or off Check inverter supply power voltage and connect line NO U4,U6,U7 output voltage is normal or not? YES Check U4,U6,U7Outside circuit NO Check each supply power pins voltage of U4,U6,U7 output to U22 are correct or not? 1、check peripheral parts of supply power pin . 2、check the soldered joint is OK or not. Change U22 YES YES NO
changhong global LS03, 22 PartⅣ: Typical troubleshooting processing flowchart . Typical troubleshooting flowchartⅠ 1、No anything(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 inside) output 12V normal? repair or change adapter NO The connection of Main board and key board ,remote control board is reliable or not? YES Is U4,U6,U7 output port voltage normal? Connect the wire again NOYES Check U4,U6,U7 Outside circuit Check each supp
changhong global LS03, 5 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 include 02 series) It is composed of a earphone outlet, user can Listen by earphone conveniently. 5、 Inverter board assembly(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.
changhong global LS03, 13 2 TDA9886 introduction: The TDA9885 is an alignment-free multistandard (PAL and 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, redu
changhong global LS03, 14 VIF1 1 VIF differential input 1 VIF2 2 VIF differential input 2 n.c. - not connected OP1 3 output port 1; open-collector FMPLL 4 FM-PLL for loop filter DEEM 5 de-emphasis output for capacitor AFD 6 AF decoupling input for capacitor DGND 7 digital ground n.c. - not connected AUD 8 audio output TOP 9 tuner AGC TakeOver Point (TOP) for resistor adjustment SDA 10 I2C-bus data input and output SCL 11 I2C-bus clock input SIOMAD 12 sound intercarrier output and MAD select with resistor n.c. - not connected n.c. 13 not connected n.c. - not connected TAGC
changhong global LS03, 6 PartⅡ: Function introduction about the main integrated circuit . Main ICs and componentsⅠ Serial number Name model Main function 1 U4 MP1430DN-LF-Z Liner voltage IC 2 U8 PI5V330SQEX Video switch 3 U9 24LC21AT/SN EEPROM(save display parameter information) 4 U23 24LC32AT/SN EEPROM(save user control information) 5 U16 PT2314 Audio processor 6 U15 TDA1517P Audio power amplifier 7 U19 TDA9886TS/V4 single and multistandard alignment-free IF-PLL demodulators 8 U17 TAF5-C2IP1RW RF tuner 9 U22 MST718BU Proce
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