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Service manual guide for LCD TV Vestel 20″, 20” TFT-LCD TV is a Progressive TV control system based on the m-controller DA555X, with built-in deinterlacer and scaler. TFT TV is a progressive scan flicker free colour television with PC input, driving an SVGA(800*600) panel with 4:3 aspect ratio. The chassis is capable of operation in PAL, SECAM, NTSC (playback) colour standards and multiple transmission standards as B/G, D/K, I/I’, and L/L´. As the thickness of the TV set has a limit, a horizontal mounted tuner is used in the product, which is suitable for CCIR systems B/G, H, L, L´, I/I´, and D/K. The tuning is available through the digitally controlled I2C bus (PLL). Below you will find info on the Tuner in use. The MSP34×0G family of single-chip Multistandard Sound Processors covers the sound processing of all analog TV-Standards worldwide, as well as the NICAM digital sound standards. The AN7522 is an audio class-AB amplifier assembled in SIL-12 Pin Plastic Package specially designed for sound cards application. The LM2576 series of regulators are monolithic integrated circuits ideally suited for easy and convenient design of a step–down switching regulator (buck converter). External Crystal and Programmable Clock Speed • Single external 6MHz crystal, all necessary clocks are generated internally • CPU clock speed selectable via special function registers. Microcontroller Features • 8bit 8051 instruction set compatible CPU. • 33.33-MHz internal clock (max.) • 0.360 ms (min.) instruction cycle. The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. It has the same pin-out as National Semiconductor’s industry standard LM317. Connection Diagrams, The LM317T is an adjustable 3 terminal positive voltage regulator capable of supplying in excess of 1.5 amps over an output range of 1.25 to 37 volts. The main function of the IC is to switch 8 video input sources on 6 outputs. Each output can be switched on only one of each input. On each input an alignment of the lowest level of the signal is made (bottom of synch. top for CVBS or black level for RGB signals). Figure shows a simplified functional block diagram of the MSP 34×0G. BLOCK DIAGRAM and Circuit Diagram.

Tags : cpu clock speed, pal secam ntsc, ntsc playback, monolithic integrated circuits, lm1117, national semiconductor, voltage regulators, sound processors, external crystal, lm317t, colour standards, dropout voltage, deinterlacer, compatible cpu, buck converter

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