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Changhong Electric LS07 Service Manual
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Changhong Electric LS07 Service Manual

Changhong Electric LS07 Service Manual

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LCD
SERVICE MANUAL
CHASSIS LS07
Please read this manual carefully before service.
TELEVISION

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Summary of Contents for Changhong Electric LS07

  • Page 1 TELEVISION SERVICE MANUAL CHASSIS LS07 Please read this manual carefully before service.
  • Page 2 PartⅢ: Signal Processing Flow chart ….……………………..16 PartⅣ: Typical troubleshooting processing flowchart and example……………………………………………………….21 PartⅤ: Spare part lists………………………………..………..26 Annex: 1、Circuit schematic diagram of LS07 chassis.……………27 2、Mainboard PCB diagram of LS07 chassis……………..40 3、Final Assembly diagram of LS07 chassis….…….....44 4、Final Wire Connection diagram of LS07 chassis……….45...
  • Page 3 PartⅠ: Specification , feature and Composition 1.1、 The Technical Specification： 20 inch LCD TV: Physical resolution :640*480(VGA), Audio power output:2*2W, Inside power module AC input voltage:AC 100～240V,50/60Hz.Standby power consuption ≤ Ⅱ、 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.
  • Page 4 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 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.
  • Page 5 Ⅳ. PCB assembly introduction The Constitution of the PCB is easier than LS07 chassis, all 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.
  • Page 6 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.
  • Page 7 RF tuner TDA5-E2I21RW2 AD converter and format MST718BE-LF transformer 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.
  • Page 8 ● Luminance Transient Improvement (LTI) ● 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 ●...
  • Page 9 GINP Analog Input Analog G Input of VGA GINM Analog Input Reference Ground for Analog G Input of VGA RINP Analog Input Analog R Input of VGA RINM Analog Input Reference Ground for Analog R Input of VGA C1INP Analog Input Analog Chroma Input for TV S-Video1 / Analog Composite Input of TV CVBS4 C1INM...
  • Page 10 HSYNCO Output Horizontal Sync Output BOUT[7]/LVB0M Output Blue channel Output [7] / LVDS B-Link Channel 0 Negative Differential Data Output BOUT[6]/LVB0P Output Blue channel Output [6] / LVDS B-Link Channel 0 Positive Differential Data Output BOUT[5]/LVB1M Output Blue channel Output [5] / LVDS B-Link Channel 1 Negative Differential Data Output BOUT[4]/LVB1P Output...
  • Page 11 ROUT[1]/LV Output Red channel Output [2] / LVDS A-Link Channel 3 Negative Differential Data Output ROUT[0]/LV Output Red channel Output [0] / LVDS A-Link Channel 3 Positive Differential Data Output External OSD Interface Pin Name Pin Type Function OSDR/GPIO I/O w/ External OSD R-channel Input / General Purpose _P30 5V-tolerant...
  • Page 12 Output SPI Interface Sampling Clock Output SPI Interface Data-In Input w/ 5V-tolerant SPI Interface Data-Out Output SPI Interface Chip Select GPIO_P00- I/O w/ 5V-tolerant General Purpose Input/Output; 4mA 58-64, 83 GPIO_P07 driving strength Input Interrupt Input for IR Receiver I/O w/ 5V-tolerant 3-Wire Serial Bus Data Input w/ 5V-tolerant 3-Wire Serial Bus Clock...
  • Page 13 AVDD_ADC 2.5V Power ADC Power 6, 21 AVDD_GMC 5V Power GMC Power AVDD_PWM 5V Power PWM Power AVDD_OPLL 2.5V Power OPLL Power AVDD_CDAC 2.5V Power Current DAC Power AVDD_XTAL 5V Power XTAL Power AVDD_MPLL 2.5V Power MPLL Power VDDC 2.5V Power Digital Core Power 50, 110 VDDP...
  • Page 14 · 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 ·...
  • Page 15 n.c. not connected TAGC tuner AGC output 4 MHz crystal or reference signal input VAGC VIF-AGC for capacitor n.c. not connected CVBS composite video output n.c. not connected AGND analog ground VPLL VIF-PLL for loop filter supply voltage AFC output output port 2;...
  • Page 16 TDA1517 pin function: SYMBOL DESCRIPTION -INV1 non-inverting input 1 SGND signal ground SVRR supply voltage ripple rejection output OUT1 output 1 PGND power ground OUT2 output 2 supply voltage M/SS mute/standby switch input -INV2 non-inverting input 2 PartⅢ: Signal Processing Flow chart This chapter mainly introduces analog signals process、video intensify process、TV system control process、TV supply system.
  • Page 17 Not connected +32V power supply，form 0～32V tune voltage Not connected 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 the main channel L/R audio signal from 8 pin.
  • Page 18 5、The location of main components and socket on mainboard and definition...
  • Page 20 Socket definition Name Connect object Function description Connect outside SCART signal input Connect outside HD audio input Connect outside HD-YPbPr input Connect outside VGA input Connect outside VGA audio input Connect adapter outside power Connect inside supply power board module Connect display screen Connect display screen MST718 debug socket...
  • Page 21 Ams1117-2.5 Low dropout voltage regulator Ams1117-3.3 Low dropout voltage regulator 4435(9435) ARX4435 Transceiver for Macair H009 Specification IRF7314 HEXFET Power MOSFET...
  • Page 22 DDC_SDA DVD_AUD_LIN SCL_MST DDC_SCL DVD_AUD_RIN CSZ_MST VGA_SCL EN_DPF_DVD RST_MST MUTE TV_VSYNC SVIDEO_Y1IN 10_VGA_UPDATE SVIDEO_C1IN 10_VGA_UPDATE UPDATE_CON VGA_SCL VGA_SDA DDC_SDA DDC_SCL SCL_UOC SDA_UOC Title LS07-CHN-LCDTV Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_200410 Drawn By:...
  • Page 23 R155 390 C133 SOGIN1 C146 HD_PC_SW 100pF 0: Select YPbPr PI5V330A CON7 1: Select PC 74LVC126A 74LVC126A Title LS07-CHN-CONNECTORS Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet of File: D:\lzy\ 设 计 文 件 \ls07\ 设 计 文 件 \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN...
  • Page 24 VCC5A C242 C244 R112 FB35 ECB2012M800T 4.7uF/50V 0.1uF R113 C147 C240 C241 C148 uPC574 0.1uF 47uF16V 47uF16V 0.1uF IN4148 R111 C239 22uF16V Title LS07-CHN-TUNER Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_200410 Drawn By:...
  • Page 25 2N3904 C106 R119 2.2K UOC_SIF2 220nF 47uF16V FB50 C103 R126 10nF IFGND SAW_SW IFGND Title LS07-CHN-UOCIII TAD12021H 2N3904 R125 IFGND Size Number Revision Ver 5.0 IFGND IFGND Date: 5-Apr-2005 Sheet of 设 计 文 件 设 计 文 件 File:...
  • Page 26 R151 FB47 ECI2012M2R4KT TV_HSYNC C252 R148 C257 C258 R241 74LVC126A 22pF R150 470pF 470pF Title LS07-CHN-MUX/AUDIO AMP/TDA9178 Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet of 设 计 文 件 设 计 文 件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_fo Drawn By:...
  • Page 27 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-CHN-MST518 Size Number Revision Ver 5.0 Orcad B Date: 5-Apr-2005 Sheet 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_2004 Drawn By:...
  • Page 28 PCLKO DCLK RBO6 RBO7 PDEO PVSO VSYNC PHSO HSYNC 33pF 33pF 33pF VLCD BBO[0..7] GBO[0..7] RBO[0..7] Title LS07-CHN-15" 17" 20" LCD Panel Size Number Revision Ver 5.0 Orcad B Date: 5-Apr-2005 Sheet 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_2004 Drawn By:...
  • Page 29 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-CHN-Sound Amplifier and Headphone Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_200410 Drawn By:...
  • Page 30 ON_PANEL 2N3904 To Inverter C228 0.1uF IRF7316 R196 3.3K R242 R203 CON6 R202 2N3904 Title LS07-CHN-POWER SUPPLY Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet of 设 计 文 件 设 计 文 件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_fo Drawn By:...
  • Page 31 UPDATE CON= +5V, VGA CONNECT WITH UOC MC14016BDR2 UPDATE CON= 0V, VGA CONNECT WITH DDC UPDATE_CON 4.7k 2N3904 Title VGA PORT UPDATE PROGRAM Size Number Revision Ver 5.0 Date: 5-Apr-2005 Sheet of 设计文件 设计文件 File: D:\lzy\ \ls07\ \Phase5_2004_1018_1022\LS07_MPCB_PH5_CHN_for_MP_200 Drawn By:...
  • Page 32 VOL- VOL+ MENU TV/VIDEO STANDBY V3_3D V3_3D 1.2K CON3 Title LS07 KEYBOARD Size Number Revision Date: 13-Jun-2005 Sheet File: E:\USER\ 蔡磊 机芯 \ls07-e\LS07_KEY_PH2.DDB Drawn By:...
  • Page 33 V3_3D 10uF16V 0.1uF AT138BT-09 V3_3D CON5 V3_3D V3_3D SML-020MVT / ROHM GREEN 2N3904 2N3904 Title LS07 KEYBOARD Size Number Revision Date: 13-Jun-2005 Sheet File: E:\USER\ 蔡磊 机芯 \ls07-e\LS07_IRLED_PH2.DDB Drawn By:...
  • Page 34 CON6 HEADPHONE JACKET Title Size Number Revision Date: 13-Jun-2005 Sheet of File: E:\USER\ 蔡磊 机芯 \ls07-e\LS07_HEADPHONE_PH2.DDB Drawn By:...