ViewSonic VG511s, Руководство по обслуживанию

Страница: 10 / 38

WORKING THEOREM
A. DC-DC CONVERTER
This brick converts the 12V input voltage to 5V for panel use and 3.3V for controller use.
It consists of a PWM IC (AP1501), flywheel Diode (D1), buck choke (L2), and capacitor (C70,71).
AP1501 is a PWM generator working at 150Khz.
Self protection features include a t
wo
stage frequency reducing current limit for the output
switch and an over temperature shutdown for complete protection under fault condition.
B. A/D converter
The MST 9030A is a highly integrated TFT LCD controller chip with the latest MST advanced imageprocessing technology
and an integrated ADC/PLL. The MST 9030A has advanced programmable non-linear parametric
cubic based scaling engine with proprietary sharpness adjustment and text enhancement. MST9030A supports both analog
and digital interfaced inputs with an internal ADC/PLL.
The MST9030A has robust handling of a wide variety of TFT LCD panels and strong support of standard
or non-standard input timings.
.
Integrated high speed triple 8-bit ADC/PLL support up to 140MHz for XGA-75Hz
.
Advanced image processing with proprietary non linear parametric cubic based scaling engineSupport dual interface
with an integrated ADC/PLL
.
Robust auto configuration for input mode detection and
clock frequency and phase recovery for standard or
nonstandard input timing
.
Support video processing with on-chip 2D de-interlacing
and color space conversion
.
Support programmable Gamma Correction
.
GPIO pins for flexible system design
D. MCU:
The MTV312MV64AJ micro-controller is an 8051 CPU core embedded device specially tailored to LCD monitor
applications.
It include an 8051 CPU core, 1024-byte SRAM, 14 built-in PWM DACs, VESA DDC interface,
4 channel 6bit A/D converter,
a 64 K-byte internal program Flash-ROM .
4. Circuit Description
7
ViewSonic Corporation
Co
nfidential - Do Not Copy VG511s
VG512s