Samsung BN44-00129C Schematic

Page 1
13 Circuit Descriptions
13-1
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.
1.3 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
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13 Circuit Descriptions
13-2
13-1-2 Main Board Parts
LS17PEA, LS19PEA
LS19PEB
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13 Circuit Descriptions
13-3
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 (GM5726).
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 digital TMDS and analog R,G,B signals and convert them to proper reso­lutions 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, FLASH and Scaler (GM5726) use the SDR direct bus for mutual communications, which is an effective, speedy system because it allows 4 additional address/data lines com­pared 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 Scaler and then con­verted to a digital value by the A/D converter of the chip. The digital value (data) is a clue to which key is entered. In practical, the voltage levels are set as below.
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13 Circuit Descriptions
13-4
13-1-3 IP BOARD BLOCK(POWER) Parts
13-1-4 IP BOARD BLOCK( INVERTER ) Parts
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13 Circuit Descriptions
13-5
13-1-5 IP BOARD ( inverter ) PROTECTION Parts
Figure 1.
Figure 2.
Pebble 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 latched­off[See the Picture2]
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13 Circuit Descriptions
13-6
13-2 Trouble Shooting
13-2-1 IP BOARD(Power)
Check fuse
Change FUSE
Yes
No
3 pin of FDM0565R
Vcc system in normal: HIGH
Check the Vcc system
Yes
No
1 pin of FDM0565R
Check the drain system
Normal: Switching
Check the output current
Check the main switching
Check others Harness, Inlet
Power On
No
Check the
feedback system
No
Check the
protection system
No
Yes
Yes
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13 Circuit Descriptions
13-7
13-2-1 IP BOARD(Inverter)
Check the 13V line
Check the power system
Yes
No
1 and 2 pins of FDM0565R
Check Protection
Normal:0.6V~0.8V
Check the IC drive
Check MOSFET
Yes
No
1 and 2 pins of FDM0565R
Check Protection
Normal:0.6V~0.8V
Check the output current
Check the OVP and OLR
circuits
Check others
Power On
No
Check the feedback
system
No
Check any dimming
circuit
No
Yes
Yes
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13 Circuit Descriptions
13-8
13-3 IP BOARD(Power) Schematic Diagrams
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13 Circuit Descriptions
13-9
13-4 IP BOARD(Inverter) Schematic Diagrams
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Memo
13 Circuit Descriptions
13-10
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