Samsung Syncmaster 743b Service Manual

2-2 
2. Product specifications

2-2. Spec Comparison to the Old Models
ModelMckinley(943NW / 943NWX) Mendel(931BW)
Design
Size19”19”
Resolution 1440 x 9001440 x 900
InputAnalog / DVI Digital with HDCPAnalog / Digital with HDCP
Response Time5ms(W to B)4ms(G to G)
Viewing Angle170/160(CR>10)160/160(CR>10)
 Brightness300cd/m²300cd/m²
Contrast 1000:1700:1
MagicBright7 step7 step
Feature
Magic Color
Color Effect
Magic Bright3
Magic Tune (Premium)
Magic Color
Magic Bright3
Magic Tune (Premium)
 
*Color Effect...

2-3
2. Product specifications

2-3. Accessories
ProductDescriptionCcde. NoRemark
Quick Setup GuideBH68-00376L
Samsung Electronics 
Service center
Warranty Card
(Not available in all locations)BH68-00633B
User’s Guide,
Monitor Driver,
Natural Color Pro Software
BN59-00585A
D-Sub(15 Pin) CableBN39-00244G
Power Cord3903-000082
2-4. Accessories (Sold separately)
ProductDescriptionCcde. NoRemark
DVI CableBN39-00246KSamsung Electronics 
Service center
 

2-4 
2. Product specifications
Memo
 

7-1
7. Schematic Diagram
7. Schematic Diagram
7-1. Circuit Descriptions
LocationFunctionRemark
Scaler
IC200
Besides the ADC, LVDS, and scaling part, an MCU is embedded as well. All of 
them are integrated into one chip.SE556M-LF
Flash
Memory
IC201
Stores the MCU program embedded in the scaler. It is of a flash type and 
rewritable.MX25LV512
IC203Stores the OSD and various timing values.24C08
IC202The memory to which DIGITAL DDC data is input24C02
RegulatorAn IC that receives DC voltage inputs. It is...

7-2 
7. Schematic Diagram

7-2. Schematic Diagrams (Scaler Part)
P
A
N
E
L
24C08EEPROM1MBFlash
InterfaceEngine
Inverter
3.3VRegulator1.8VRegulator
14.318MHzXTAL
(PC)ANALOGRGBHSYNCVSYNC
Function Key
DisplayProcessingEngine
LVDSPanelInterface
OSDClockGeneratorMCU
SE717M-LF
+5+5+5+5
8Bit8Bit
+5+5
ISPISP
7-3. Schematic Diagrams (Power Flowchart)
IC 601(NCP1117ST33T3G)
IC 602(NCP1117DT1815G)
IP
Board
IP
Board
IC 203(AT24C08)
IC 200Scaler
5V
3.3V
1.8V
IC 201(MX25L1005MC)
Panel
5V
3.3V
3.3V
 

7-3
7. Schematic Diagram

7-4. Schematic Diagrams (IP Board)
SMPS Part
 

7-4 
7. Schematic Diagram
Inverter Part
 

7-3
7. Schematic Diagrams
7-5. Schematic Diagrams  (Main PBA)
This Document can not be used without Samsungs authorization.
105C
105C
105C
SDR3.3VDDCVDDP
AVDC1.8
VDDCVDDP
VDVI
SDR3.3
AVDC3.3
AVDC3.3
AVDC1.8
VDVI
CHK_DSUB56OHM
100PF+3.3V_DIODE
R111
390OHMC110
4.7NF
4.7NF4.7NF10NF4.7NF4.7NFRED+
RED-
BLU+HSYNC
VSYNC
+3.3V_DIODE15PFBAV99
100OHM
C108
4.7NF
2SC2412K-Q
DDC_SDA_VGADDC_SCL_VGA
56OHM
C106
C107
GRN+C111
2
BLU-C112
R122
GRN-
100OHM100OHMAGND
AGNDQ205
100KOHMR225
10KOHMR222
2
1
C116
1R121
21BD102...

4-1
4. Troubleshooting
4. Troubleshooting
4-1. Troubleshooting
Set custom mode as follows before beginning a repair. 
• Resolution: 1440 x 900 
• V-frequency: 60 Hz
If the screen is blank, check whether the power cord is connected correctly.
The circuits to check: 
• When the raster does not appear: The Function PCB, Main PCB, I/P PBA 
• When 5V is generated but a blank screen is displayed: Main PCB 
• When 5V is not generated: I/P PBA
“Press the MENU button and hold down the, “ (Enter, Source)” button...

4-2 
4. Troubleshooting

4-2. When the Power Does Not Turn On
Symptom- 
 
When turning on the Power button after connecting the power cable, the LED at the front of the monitor does not operate.
Major checkpoints - 
 
When turning on the Power button after connecting the power cable, the LED at the front of the 
monitor does not operate.
- Check the IP board power fuse and the IP board output power.
- Check the connections for the IP board and the Main board inside the monitor.
- Check the Main board...