Circuit Description - ViewSonic VP730 Service Manual

1.
WORKING THEOREM
A. Scaler
The TSU66AJ is total solution graphics processing IC for LCD monitors with panel resolutions up to SXGA. It is
configured with a high-speed integrated triple-ADC/PLL, an integrated DVI receiver, a high quality display
processing engine, and an integrated output display interface that can support LVDS panel interface format. To
further reduce system costs, the TSU66AJ also integrates intelligent power management control capability for
green-mode requirements and spread-spectrum support for EMI management. The TSU66AJ incorporates the
world' s first coherent oversampled RGB graphics ADC in a monitor controller system1. The oversampling ADC
samples the input RGB signals at a frequency that is much higher than the signal source pixel rate. This can
preserve details in the video signal that ordinarily would be lost due to input signal jitter or bandwidth limitations in
non-oversampled systems. The TSU66AJ also incorporates a new Dynamic Frame Rate (DFR) generator2 for
the digital output video to the display panel that preserves the advantages of a fixed output clock rate, while
eliminating the output end of frame short-line.
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B. MCU:
The MTV416M micro-controller is an 8051 CPU core embedded device targeted for LCD Monitor or LCD
TV application. It includes an 8051 CPU core, a 128K-byte internal program Flash-ROM, a 768-byte SRAM,
4 channels of PWM DAC, 4 channels of 6-bit ADC, and a built-in sync-processor. It also includes two IIC
Slave B ports, supporting VESA DDC/CI for both D-sub and DVI interfaces, and a Boot-Code-Free ISP (In
System Programming).
ViewSonic Corporation

4. Circuit Description

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