Samsung 2220WM - SyncMaster - 22" LCD Monitor Instrukcja serwisowa - Strona 42

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1. No Picture (Vga Mode)

12-1-2 Main board Parts

(PC)ANALOG

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

Response

LVDS

Time

Panel

Enhancement

Interface

SDRAM

Clock

MCU

Generator

14.318MH

1MB

24C04

Flash

EEPROM