Iiyama PLE1700S, Service Manual

Page: 17 / 41

PLE1700S Service Manual
-16-
05/12/2006
7. WORKING THEOREM
A. DC-DC CONVERTER
This brick convert is the 110-220AC input voltage to 12V AND 3.3V output for invert use and
panel use and system controller use .
3.3V Out put at L804
VCC 12V In put at L803,F901
B. Scaling controller
The ADC is to convert RGB analog signal to digital signal that scaling chip can acknowledge.
The HSYNC input receives a logic signal and provides the frequency reference for pixel clock
generation.
The scaling IC is to converts the input signal ranging from VGA to SXGA into SXGA resolution
that panel can acknowledge.
GENERAL DESCRIPTION
The TSUM57AK 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, a high quality display
processing engine, and an integrated output display interface that can support RSDS panel
interface format.To further reduce system costs, the TSUM57AK also integrates intelligent power
management control capability for green-mode requirements and spread-spectrum support for EMI
management.
The TSUM57AK incorporates the world’s first coherent oversampled RGB graphics ADC in a
monitor controller system.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 TSUM57AK also incorporates a new Dynamic Frame Rate (DFR) generator 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.
PIN DESCRIPTION
Analog Interface
Pin Name Pin Type Function Pin
Schmitt Trigger Input HSYNC0
w/ 5V-tolerant
Analog HSYNC input 63
Schmitt Trigger Input VSYNC0
w/ 5V-tolerant
Analog VSYNC input 64
REFP Internal ADC top de-coupling pin 62
REFM Internal ADC bottom de-coupling pin 61
RIN0P Analog Input Analog red input 59
RIN0M Analog Input Reference ground for analog red input 58
SOGIN0 Analog Input Sync-on-green input 57
GIN0P Analog Input Analog green input 56
GIN0M Analog Input Reference ground for analog green input 55
BIN0P Analog Input Analog blue input 54
BIN0M Analog Input Reference ground for analog blue input 53
REXT External resistor 390 ohm to AVDD_DVI 51
DVI Interface
Pin Name Pin Type Function Pin
R+ Input DVI Input C RED 39
R- Input DVI Input Channel – RED 40
G+ Input DVI Input C GREEN 42
G- Input DVI Input Channel – GREEN 43
B+ Input DVI Input C BLUE 45
B- Input DVI Input Channel – BLUE 46