Service Manuals, User Guides, Schematic Diagrams or docs for : Samsung LCD TV BN44-00177B samsung_bn44-00177b_sip1920_monitor_932mw_power-inverter
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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)
4 x (7.5mA x 720mVrms)=4 x 5.4=21.6W
2.2 The power consumption of the Panel Control board is as follows: 5V x 720mA=3.6W
2.3 The power consumption of the Scaler is as follows: 3.3V x 245mA + 1.8V x 300mA = 1.35W
13-1
13 Circuit Descriptions
13-1-2 Main Board Parts
1. Inverter: A conversion device that converts DC
rated voltage/current to high ones necessary 6. SCALER & EEPROM: I2C is a two-way serial
for the panel lamp. bus of two lines that supports communications
across the integrated circuits as well as
2. DC/DC(Regulator): General term for DC to DC between FLASH and EEPROM.
converting devices. In particular, FLASH and Scaler (SE567MRH-
The IP board receives 5V and outputs 1.8 or LF) use the SDR direct bus for mutual commu-
3.3V that is supplied to the scaler (SE567MRH- nications, which is an effective, speedy system
LF). because it allows 4 additional address/data
lines compared 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
PROTECTION Parts
- PROTECTION Parts are divided two parts. When lamp voltage rose as absurd and lamp feedback electric
current would not be sensed. So all of the two halt IP-Board's function that prevent action the enemy more
than IP-Board's continous abnormality action.
- When Trans output voltage rose as absurd, become OVP and halts IP-board's function because the
divided voltage is inputted by IC(U201) 2 PIN.
- When lamp current is sensed, become OLP and halts IC because the IC(U201) 2 PIN is became
under 2.5V
13-4
13 Circuit Descriptions
13-2 Trouble Shooting
13-2-1 IP BOARD(Power)
Power On
No
Check Fuse (F101)
Yes
Change FUSE
IC101 Vst-Pin
No (Norma:High)
No
Check the short of AC part or Check the IC
Yes
IC101 D-pin
IC101 Vcc-Pin
No (Normal:9~16V)
No
Check the 13V output part Check the Vcc part
open Yes
IC101 D-Pin
(Normal:Switching)
No
Yes Check the Switching part
Output 13V
No (Normal:12~14V)
No
Check the protection system Yes Check the feedback system
Inlet/Output
Harness
No
Yes Check the Pin or wire
connection
Check others Harness, Inlet
13-5
13 Circuit Descriptions
13-2-1 IP BOARD(Inverter)
Power On
Check the 13V line
No
Yes Check the Adapter system
16Pin
(Normal:5Vtyp.)
No
Yes Check the Input Circuit
Control IC is
(Pin 12, 13 : chopping wave
Pin 8, 9 : square wave) No
Yes Check the Control IC & IC
Driver
Inverter Trans
No (Pin8,9 : square wave)
No
Check the Protection Circuit Yes Check the Half-bridge part
Output Current
No (Normal Output)
No
Check the Dimming Circuit Check the Feedback Circuit
Yes
Check others Harness, Inlet
13-6
13 Circuit Descriptions
13-3 IP BOARD(Power) Schematic Diagrams
13-7
13 Circuit Descriptions
13-4 IP BOARD(Inverter) Schematic Diagrams
13-8
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