ViewSonic VP930-2 VS10725, Service Manual

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4. Circuit Description
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).
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D o Not Copy V P930/b ViewSonic Corporation
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nfidential