Samsung 2220WM - SyncMaster - 22" LCD Monitor Service Manual page 42

12-1-2 Main board Parts
(PC)ANALOG
R
G
B
HSYNC
Function Key
IP Board
1. Inverter: A conversion device that converts DC rated voltage/current to high ones necessary for the panel
lamp.
2. DC/DC(Regulator): General term for DC to DC
converting devices.
The IP board receives 5V and outputs 1.8 or
3.3V that is supplied to the scaler
(TSUM16AWK-LF-1).
3. Power MosFET: The IP board receives 5V and outputs a lower voltage in DPMS mode and supplies the
whole 5V for the panel operating board in normal conditions. In that case, the switching of Power
MosFET is controlled by Micom.
4. Scaler: Receives the analog R,G,B signals and convert them to proper reso- lutions using up- or down-
scaling that are transferred to the panel in the LDVS formats.
5. Crystal(Oscillator): Use one 14.318MHz oscillator externally to supply power to both MCU and Scaler at
the same time.
6. Scaler & EEPROM: I2C is a two-way serial bus of two lines that supports communications across the
integrated circuits as well as between FLASH and EEPROM.
In particular, MCU(TSUM16AWK-LF-1) and use the SDR direct bus for mutual communications, which is
an effective, speedy system because it allows 4 additional address/data lines com- pared to the old serial
systems.
7. Function Key: A certain keystroke generates a certain electrical potential, which is transferred into ADC
input port of the MCU and then con- verted to a digital value by the A/D converter of the chip. The digital
value (data) is a clue to which key is entered.
TSUM16AWK-LF-1
Display
Processing
Engine
Single
Interface
Engine
OSD
1.8V
3.3V
Regulator
Regulator
5V
Regulator
43
Response LVDS
Time Panel
Enhancement Interface
SDRAM
Clock
MCU
Generator
14.318MH 1MB 24C04
z Flash EEPROM
P
A
N
E
L