MAIN FEATURE .........................4 MAIN ICS FUNCTION INTRODUCTION ...................8 SYMPTOMS AND CORRECTION ...................46 LIST OF BREAKABLE AND MAINTENANCE PARTS .............47 FACTORY MODE AND NOTICE ....................49 CIRCUIT DIAGRAM .........................53 WIRING DIAGRAM........................66 EXPLODED VIEW ........................67 PART LIST ..........................68 Model No.: LCT-26CHSTP.doc Version: 1.0...
Automatically on/off in certain preset time, and transmit automatically to the fixed channel Blue background noise reduction In TV, AV (S-Video), YCbCr, and YPbPr modes, screen displays soft blue background if there is no signal input Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 5
Power Energy Saving Mode and work again when it received a valid VGA signal or press any button on the panel/remote control. Plug and Play It is no need to equip any installation software when the product is used as computer terminal display equipment Legerity, convenience, low power consumption Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 6
Unit IC Compositions: LS08 chassis LCD TV is mainly composed of regulator IC, RF IC, video processor IC, Power Amplify IC, Analog Video IC, System Control IC and Key Control IC, see this IC frame as below: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 7
Screens for LS08 have built-in adverse transformer, which change DC to high voltage AC signal lightening the back light; The LCD screen is used to display the image after the image signal has been processed by the main board. Model No.: LCT-26CHSTP.doc Version: 1.0...
U700 GM1501-BD Video processor U201 TDA15021H/N1B07 AV decoder U402 SAA7115HL/V1 Sub channel video decoder U305 SM5302AS-G-ET High definition signal filter U400 TDA8759HV/8/C1 Video signal modulus transformer TDA9178T/N1 Video signal picture amendment U600 MT46V2M32LG-4 Frame buffer Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 9
IIC bus (Clock) IIC bus (Data) Power supply To produce 0~30V tune voltage to 0~30V Intermediate frequency output (NC) Intermediate frequency output (NC) Band control Band control Auto gain control VEDIO CVBS signal output Power supply AUDIO Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 10
Embedded IC for adjustments of gain, contrast, brightness, color saturation, hue and flesh tone. Efficiency in reducing EMI electromagnetism inference power consumption Inclined grain processing with small angle High quality video processing Programmable output format Embedded LVDS transport Advanced OSD Embedded micro controller Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 11
ADC3.3Vpower supply A12, B12, C12 LBADC_IN1~ ADC analog input channel LBADC_IN3 LBADC_RETURN Channel analog ground LBADC-GND Power supply voltage analog ground OCM bus port AA1~AA3, Y1~Y3, OCMADDR0~ Address input output port W1~W3, V1~V4, OCMADDR19 U1~U4, T1~T3 Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 12
Red signal or V/Cr/Pr signal input A19, B18, B19, D18 B23, B24, B25, A24 VBLU7~ VBLU0 Blue signal or U/Cb/Pb signal input A25, C23, C24, D24 Screen Control Port PPWR Screen power control PBIAS Screen bias control Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 13
Crystal oscillator interface VDDD33_PLL, Digital power supply VDDD33_SDDS VDDD33_DDDS VSSD33_PLL Digital ground VSSD33_SDDS VSSD33_DDDS VDDA33_RPLL Analog power supply VDDA33_FPLL VDDA33_SDDS VDDA33_DDDS VSSA33_RPLL Analog ground VSSA33_FPLL VSSA33_DDDS VSSA33_DDDS TCLK Reference clock signal input ACS_RSET_HD External resistance port Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 14
L23, M23, P23, R23, T23, V23, W23, Y23, AA23, AB23, AC23 VDDA18_DLL 1.8V power supply VSSA18_DLL Power supply ground Digital power supply K10, K11, K16, K17, CORE_1.8 1.8V power supply L11, L16, T11, T16, T17, U10, U11, U16, Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 17
Output format RGB 4:4:4, YUV 4:4:4, YUV 4:2:2, CCIR 656 or YUV 4:2:2 semi-planar standard on output bus I²C bus control Programmable clock phase adjustment cells Amplifier bandwidth of 100 MHz Integrated PLL divider Power-Down mode Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 19
80,79,78 R/Pr1~ R/Pr3 Red/red-chrominance channel analog input 89~92,97~101 TST0~TST17 Reserved for test 112,121,122, 124,125,160~163 Power-down control input Output enable input I²C bus address control input COAST PLL control input GAIN Gain input CLAMP Clamp input Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 20
9W /Ch into an 8Ω load from 12Vsupply; Efficient, class D operation eliminates heat sinks and reduces power supply requirements; 32-step DC volume control from -40db~36db; Line outputs for external headphone; Thermal and short-circuit protection Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 21
(tied to pins 46 and 47 internally), not connected to PVCCL or AVCC. PVCCR 46, 47 – Power supply for right channel H-bridge (tied to pins 38 and 39 internally), not connected to PVCCL or AVCC. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 22
DC voltage that sets the gain of the Class-D and VAROUT outputs. VREF Analog reference for gain control section. V2P5 2.5-V Reference for analog cells, as well as reference for unused audio input when using single-ended inputs. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 24
Output buffer gain switching function: 0, 6dB (input-to-output AC signal gain) Channel-to-channel gain difference: 0.5dB(±5% supply voltage variation) Channel-to-channel phase difference: 3.5 degree Output signal harmonic distortion (all channels): 1.5% Cutoff frequency: 5.8 to 37MHz variable SM5301AS Internal Block Diagram: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 25
Analog RINA or YINA signal input. Sync signal is input on SYNCIN pin. RINB/YINB Analog RINB or YINB signal input. Sync signal is input on SYNCIN pin. 4, 8, 28 No connection (leave open or connect to ground) Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 26
Two improved 9 Bit CMOS analog-to-digital converter in differential CMOS style; Automatic Clamp Control (ACC) for CVBS, Y and C; Enhanced Horizontal and vertical Sync Detection; P AL delay line for correcting PAL phase errors; Automatic TV/VCR detection; TV/VCR Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 28
“11h and 12h” RTS1 35 O real time status or RTS1 sync information, controlled by subaddr. “11h and 12h” RTCO Real time control output AMCLK Audio master clock output ASCLK Audio serial clock output Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 29
In ten bit video output mode: this signal represents the video bit 1. XCLK clock I/O expansion port data qualifier I/O expansion port XRDY task flag or read signal from scaler, controlled by XRQT (subaddr. 83H) Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 30
With an external FM tuner also signals with an IF frequency of 10.7 MHz can be demodulated. For the QIP90 versions this is valid only for the “stereo” versions Built-in adaptable brightness delay circuit Switch able brightness signal transmission rate Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 32
CVBS2/Y2 CVBS/Y input CVBSO/PIP CVBS/PIP signal output scan velocity modulation output FBISO/CSY flyback input/sandcastle output or composite H/V HOUT horizontal output VIN (R/PRIN2/CX) V-input for YUV interface UIN (B/PBIN2) U-input for YUV interface Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 33
Beam current limiter input Red output Green output Blue output INT0/P0.5 External interrupt 0 or port 0.5 (4 mA current sinking direct drive of LEDs) 98,99,102~109 P0.0~ P0.4 Data port 111~116,119,120 P1.0~P1.7,P2.0~P2.5, 122,123,126~ 128 P3.0~P3.3 Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 34
-34 - UOC Block Diagram: CHAPTER THREE SIGNAL FLOW ANALYSIS AND KEY POINT MEASURE DATA Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 35
5V is divided into two ways, one way is provided for other IC and apparatus, the 5V will be turned down under standby mode, but can not be cut off. The other 5V is provided for MCU, infrared receiver, EEPROM and so on, it would not be cut off under standby mode. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 36
U402 SAA7115 1, 25, 51, 75, 33, 43, 58, 68, 93, 8, 83 U504 U502 LM1117-1.8 LM2596-5.0 U700 GM1601 U505 LM1117-2.5 MCU5 JP1 the U305 the 2 U506 CN70 the 4 LM1117-3.3 CN70 the 3 Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 37
59 PIN Manostat Pin Voltage in Main Board Schedule Name Type PIN1(V) PIN2(V) PIN3(V) PIN4(V) PIN5(V) LM1117-1.8V LM1117-3.3V LM2596-5.0 U405 LM1117-3.3 78M08 U403 LM1117-1.8V U503 LM1806-3.3 U505 LM1117-2.5 U506 LM1117-3.3 U501 LM2596-5.0 U502 LM2596-5.0 U504 LM1117-1.8V Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 38
-38 - Main Components and Socket Locations and Definitions: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 39
Prepare to use JP701 Display CN306 Prepare to use AVP303 DVI audio input CN300 DVI port AVP300 VG audio input CN301 VGA port JPY400 HDTV AV input JPY401 JPY402 JPA400 SCART (1) interface JPA401 SCART (2) interface Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 41
UT1,The undulance of the 10 of SAA7115 also like this: RF input color stripe signal, the Pin85, Pin86, Pin87 of U201 output R,G,B signal undulance, the E pole undulance of Q171,Q172,Q173: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 42
U201, the 11 pin of U5, the 4 pin of parent/sub RF tuner: RF input color stripe signal, UOC vertical sync signal, the undulance of the 22th pin of U201, the pin of U400: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 43
-43 - RF input color stripe signal , UOC vertical sync signal , the undulance of the 22th pin of U201,the pin of U400: Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 44
RF input gray ladder signal, the TV signal undulance in the 19 pin of SAA7115: The 1KHz sound signal input, the undulance of the 60 , 61th pin of U201, the undulance of the 2th, pin of U6 also like this: Model No.: LCT-26CHSTP.doc Version: 1.0...
The LCD TV can not work abruptly, power off and turning it on controlled (inc red lamp is again. no but the TV is off, remote control and key press in TV can not control the TV, etc.) Model No.: LCT-26CHSTP.doc Version: 1.0...
HWUC_BRI denotes the name of adjusting item now, the 0X1F denotes the numerical value. Each adjusting item have only one index number, the operator press the numeric key or press P+/P- directly. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 50
2. When tuning the 16 item, the storage data will be cleaned off. Therefore, if not necessary, please do not adjust it, the items of index number 1, 2, 3, 4, 5, 6 are not necessary to adjust. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 51
Set the picture of LCD TV for standard condition Set the distance of light receiver of white balance from center place of LCD display screen for 15cm±3cm. Make sure that the environmental brightness is below 2cd/m2. Model No.: LCT-26CHSTP.doc Version: 1.0...
Page 52
Δuv 0, if not, it means abnormal color, then you should adjust values of R, G, B to 0, meanwhile, meet the color coordinates requirements. Model No.: LCT-26CHSTP.doc Version: 1.0...
-67 - EXPLODED VIEW 1. Connect each line bouquet and plug with line according to final wiring connection diagram. 2. Routing of the bouguet and plug with line is confirmed by professional technologist and paste adhensive tape at suitable position to fix them and require routing not dispersedness. 3.
PART NAME Chassis module Front frame module Back cover module Pedestal module Plug with line Power bracket Power filter Screw M3x6 Screw M3x8 Screw M3x8 Screw M4x8 Screw M4x20 Screw M3x10 Screw M3x12 Screw 6x16 Model No.: LCT-26CHSTP.doc Version: 1.0...
Need help?
Do you have a question about the LCT-26CHSTP and is the answer not in the manual?
Questions and answers