Sony SDM-HS74, Руководство по обслуживанию

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DESCRIPTION OF BLOCK DIAGRAM
1. Video Controller Part & Display Data Transmitter Part.
This part amplifies the level of video signal for the digital conversion and converts from the analog video signal to the
digital video signal using a pixel clock.
The pixel clock for each mode is generated by the PLL.
The range of the pixel clock is from 25MHz to 135MHz.
This part consists of the Scaler, LVDS Tx, TMDS Rx, Reset IC.
The Scaler gets the video signals which were converted analog to digital, interpolates input to 1280 x 1024
resolution signal and outputs 8-bit R, G, B signal to transmitter.
Especially pre-amp / ADC / Video controller/ Transmitter are merged to one chip ‘MST9131A’ by MST.
This part transmit digital signal from the Scaler to the receiver of module.
2. Power Part
This part consists of the one 3.3V and one 2.5 regulators to convert power which is provided 5V by LIPS Board.
In particular, 5V is provided for LCD Panel. There is also 12V which is for Audio power.
Also, 5V is converted 3.3V and 2.5V by regulator. Converted power is provided for IC in the main board.
3. System Controller (Microprocessor) Circuit
1) Microprocessor (U501) distinguishes polarity and frequency by calculating horizontal and vertical sync input from
signal source.
2) Microprocessor (U501) carries out power control by sending power-down trigger signal to each IC.
3) Microprocessor (U501) communicates with EEPROM (704), and MST9131A (U201) through IIC or 8 bit bus line.
It is enable to control and communicate each devices.
4) Microprocessor (U501) let User adjust screen by OSD function.