Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung Monitor Monitor 740NW - 940NW 740NW 740NW[4]

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                                                                                    13 Circuit Descriptions



13 Circuit Descriptions
13-1 Overall Block Structure
13-1-1 Power Tree




1. When the AD board is in DPMS state:
   1.1 The IP has been designed so that it operates with a power consumption of less than 0.6W of.
   1.2 The Scaler consumes power up to 37mA
   1.3 The power to the panel is switched off


2. When the AD board is operating normally:
   2.1 The maximum power consumption of the panel lamps is described below (It may vary depending on
       the panel manufacturer)
       17" : 4*(7.5mA*650mVrms)=4*4.9=19.6W
       19: : 4*(7.5mA*720mVrms)=4*5.4=21.6W
   2.2 The power consumption of the Panel Control board is as follows: 5V*720mA=3.6W
   2.3 The power consumption of the Scaler is as follows: 3.3V*245mA + 1.8V*300mA = 1.35W




                                                                                                      13-1
13 Circuit Descriptions

13-1-2 Main Board Parts




1. Inverter: A conversion device that converts DC    6. SCALER & EEPROM: I2C is a two-way serial
    rated voltage/current to high ones necessary        bus of two lines that supports communications
    for the panel lamp.                                 across the integrated circuits as well as
                                                        between FLASH and EEPROM.
2. DC/DC(Regulator): General term for DC to DC          In particular, FLASH and Scaler (GM5726) use
   converting devices.                                  the SDR direct bus for mutual communications,
   The IP board receives 5V and outputs 1.8 or          which is an effective, speedy system because it
   3.3V that is supplied to the scaler (GM5726).        allows 4 additional address/data lines com-
                                                        pared to the old serial systems.
3. Power MosFET: The IP board receives 5V and
   outputs a lower voltage in DPMS mode and          7. Function Key: A certain keystroke generates a
   supplies the whole 5V for the panel operating        certain electrical potential, which is transferred
   board in normal conditions. In that case, the        into ADC input port of the Scaler and then con-
   switching of Power MosFET is controlled by           verted to a digital value by the A/D converter of
   Micom.                                               the chip. The digital value (data) is a clue to
                                                        which key is entered. In practical, the voltage
4. Scaler: Receives the digital TMDS and analog         levels are set as below.
   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 oscilla-
   tor externally to supply power to both MCU and
   Scaler at the same time.




13-2
                                         13 Circuit Descriptions

13-1-3 IP BOARD BLOCK(POWER) Parts




13-1-4 IP BOARD BLOCK(INVERTER ) Parts




                                                           13-3
13 Circuit Descriptions

13-1-5 IP BOARD ( inverter ) PROTECTION Parts
BIZET INVERTER CONTROLER FAN7310 have 2-way of the PROTECTION MODE.


1. OVP[Over Voltage Protection] : If the Voltage of the series capacitors C10 & C15 is over the 2.0V, the
Inverter latched-off.[See the Picture1]


2. OLP[Over Load Protection] : If the inverter output harness is opened(No-output current), the base of the
                             Q1 turns on and chage the C9 ovter 2V and then, the Inverter latched-
                             off[See the Picture2]




                                                   Figure 1.




                                                                             Figure 2.

13-4

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