Samsung Syncmaster 743b Service Manual
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![Page 16
1-1
1. Precautions
1. Precautions
1-1. Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against\
potential hazards such as
electrical shock.
1-1-1. Warnings
For continued safety, do not attempt to modify the circuit board.
Disconnect the AC power and DC power jack before servicing.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.
It is essential that service technicians have an...](http://img.usermanuals.tech/thumb/66/52524/w64_samsung_syncmaster_743b-service-manual-15.png "Page 16
1-1
1. Precautions
1. Precautions
1-1. Safety Precautions
Follow these safety, servicing and ESD precautions to prevent damage and to protect against\
potential hazards such as
electrical shock.
1-1-1. Warnings
For continued safety, do not attempt to modify the circuit board.
Disconnect the AC power and DC power jack before servicing.
1-1-2. Servicing the LCD Monitor
When servicing the LCD Monitor, Disconnect the AC line cord from the AC outlet.
It is essential that service technicians have an...")
![Page 17
1-2
1. Precautions
1-2. Servicing Precautions
WARNING: An electrolytic capacitor installed with the wrong polarity might explode.
Caution:
Before servicing units covered by this service manual, read and follow t\
he Safety Precautions section of
this manual.
Note:
If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
1-2-1 General Servicing Precautions
Always unplug the unit’s AC power cord...](http://img.usermanuals.tech/thumb/66/52524/w64_samsung_syncmaster_743b-service-manual-16.png "Page 17
1-2
1. Precautions
1-2. Servicing Precautions
WARNING: An electrolytic capacitor installed with the wrong polarity might explode.
Caution:
Before servicing units covered by this service manual, read and follow t\
he Safety Precautions section of
this manual.
Note:
If unforeseen circumstances create conflict between the following servicing precautions and any of the
safety precautions, always follow the safety precautions.
1-2-1 General Servicing Precautions
Always unplug the unit’s AC power cord...")
![Page 18
1-3
1. Precautions
1-4. Installation Precautions
For safety reasons, more than two people are required for carrying the p\
roduct.
Keep the power cord away from any heat emitting devices, as a melted covering may cause fire or electric shock.
Do not place the product in areas with poor ventilation such as a booksh\
elf or closet. The increased internal
temperature may cause fire.
Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed
to...](http://img.usermanuals.tech/thumb/66/52524/w64_samsung_syncmaster_743b-service-manual-17.png "Page 18
1-3
1. Precautions
1-4. Installation Precautions
For safety reasons, more than two people are required for carrying the p\
roduct.
Keep the power cord away from any heat emitting devices, as a melted covering may cause fire or electric shock.
Do not place the product in areas with poor ventilation such as a booksh\
elf or closet. The increased internal
temperature may cause fire.
Bend the external antenna cable when connecting it to the product. This is a measure to protect it from being exposed
to...")
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 - Grey scale: Images are displayed in a grey tone on the screen. - Green: Images are displayed in a green tone on the screen. - Aqua: Images are displayed in a blue tone on the screen. - Sepia: Images are displayed in a brown tone on the screen. Image Size : If the resolution is not wide resolution, this option allows the screen size to be selected as normal or wide.
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
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 used in circuits that stabi\ lize the DC voltage. NCP117DT18T5G APL1117-33VC
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
7-3 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 21BD101 2 1ZD104 2 1 ZD105 MGND2 MGND1 98765432 121110 1 CN600 2 1 C230 2 1 C610 1+3.3V 1+14V 2 1R226 C632C631 R233 R215 3 2 1 Q201 R234 R216 C228 C213 C229 R223C209 R217 C207 C211 X201 C210 R232R273 C212 99989796959493929190 9 89888786858483828180 8 79787776757473727170 7 6968676665 6463626160 6 59585756555453525150 5 49484746454443424140 4 39 383736353433323130 3 29282726252423222120 2 19181716151413 128127126125124123122121120 12 119118117116115114113112111110 11 109108107106105104103 102101100 10 1 IC200 2 1 C220 1+5V_PANEL TP1+1.8V+5V_IP_3 KEY1_OUTKEY2_OUT LED_G GND_7GND_6GND_5 BL_ENBL_ADJ_ANALOG +5V_IP_2+5V_IP_1 GND_9GND_8 BL_ADJ_PWM GND_4 GND_3 R229R270 R230 3 2 1 Q203 R235 C208 R218 R219 3 2 1 Q204 R271 R211R210 C234 R253R252 R212R213SDASCLWCVCC VSSE2NC_2NC_1 GND_10 WPSOCSVCC_F SISCLKHOLD C622C621C620C619C618C617C614C613C612C641C636C635C638 C627C626C623 C600C605C601C604C603 C630C628 C640 C637 C206R214 R255R612 LVB0MLVB0PLVB1MLVB1PLVB2MLVB2P LVBCKMLVBCKPLVB3MLVB3PLVA0MLVA0P LVA1MLVA1P LVA2MLVA2PLVACKMLVACKPLVA3MLVA3P 87654321 IC203 87654321 IC201 R236 21C231 MGND2 MGND1 987654 30 3 29282726252423222120 2 19181716151413121110 1 CN400 R224 Q202654321 Q206 2 1C629 MGND13 2 1 IC601 D601D60032 1 IC602 2 1C639ZD601 R209R208 R245 R250R251 ZD204 ZD203ZD202C205C221C204C218 3 2 1 Q601 R601R602 R600 R126 C202 C201 C115 C117C125C124 D108D110D109 R131R130 R125 C109 R123 R119 R115 R112 R116 R207 R113R114 R117R118 R120 R206 ZD201 MGND2 MGND1 9 8 7 6 5 4 3 2 15 14 13 12 11 10 1 CN101 100OHM EDID_PROTECT LVBCKPLVBCKM LVB2PLVB2M 3KOHM 1UF PANEL_EN 5.6V100UF NCP1117DT18T5G 100NF16V 100UF16V 10KOHM 16V100NF 16V S1G400V400VS1G 100UF100NF16V100NF NCP1117ST33T3G 100NF100NF16V16V16V16V16V100NF100NF 50V DDC_SCL_VGA 10KOHM RX2- 3KOHM MCL 5.6V 100OHM 3.3KOHM 50V 50V S-24CS08AFJ-TB-1GE 3.3KOHM 100PF 14.31818MHZ LVA3M 2SC2412K-Q 10KOHM KTC3875S-Y 1UF CHK_DVIPANEL_ENKTC3875S-Y 10V KEY1HDCP_HOTPLUGKEY2BL_ADJ_PWM 10KOHM 100OHM 4.7KOHM LVB3M LVB0P BL_EN 50V 10OHM 100OHM 100NF100NF16V 10KOHM SI3443BDV 1UF SDO BL_ADJ_ANALOG 10KOHM4.7KOHM KTC3875S-Y 16V16V 100NF 100NF100NF16V 16V 10V10V DDC_SCL_DVIDDC_SDA_DVI SOGGRN+ 10KOHM 10KOHM 10KOHM 100NF16V100NF 75OHM 100OHM100NF 10KOHM F_PROTECT KTC3875S-Y2KOHM LVB1P 100NF 10KOHM 100NF16V LVACKMLVACKPLVA3MLVA3P F_PROTECT MDA LED_GREEN DDC_SDA_VGAVSYNCHSYNC RED+RED- GRN-BLU+BLU- RXC-RXC+ RX0-RX0+ RX1-RX1+ RX2+ WR_PROTECTCHK_DSUB SDISCKCSZ LVB0MLVB0PLVB1M LVB2MLVB2PLVBCKMLVBCKPLVB3MLVB3P LVA0MLVA0PLVA1MLVA1PLVA2MLVA2P SDO 16V LVA0P 2KOHM 100NF LVACKM LVA1PLVA1M 10KOHM 5.6V 75OHM 75OHM CSZ 5.6V5.6V 10KOHM 100OHM100OHM 16V100NF16V 16V 100NF16V 100NF LVA2M 50V LVACKP 390OHM 4.7KOHM 22PFLVA0MLVB3P 50V SOG LVB1PLVB1M LVA2P LVA3P LVB0M 16V 100NF 16V100NF16V16V 16V16V100NF 16V16V100NF16V100NF 16V16V100NF100NF 16V100NF 100NF 16V100NF 16V100NF 22PF 100PF10V 10UF SCKSDI MX25L1005MC-12G 100OHM 100OHM100OHM 10KOHM 10KOHM 10KOHM 10KOHM 10OHM 16V100NF 100OHM 16V 100NF BL_ADJ_ANALOG 100OHM LED_GREEN 50V10NF 100OHM KEY1KEY2 10KOHM 100NF BAV99 50V22PF 100NF16V BAV99 5.6V 100NF16V BL_ADJ_PWM 16V BL_EN 50V10NF MDAMCLWR_PROTECT100OHM CN_S_012_G2 SMAW200A-12P 100NF 7.5KOHM +5V_EDID AGND AGNDAGNDAGNDAGNDAGNDAGND +1.8V AGND +5V_IP AGND +5V_IP AGND AGNDAGNDAGNDAGND AGND+5V_IP AGND +1.8V+3.3V AGND AGND +3.3V +5V_IP AGND AGND AGND +3.3V +5V_PANEL +5V_IP AGND +1.8V +3.3V +3.3V +1.8V AGND AGND +3.3V AGND AGND +14VAGNDAGND +1.8V AGND AGND +3.3V AGND +3.3V +5V_IP +3.3V AGND AGNDAGND AGND AGND AGND AGND AGNDAGNDAGNDAGND AGNDAGNDAGNDAGNDAGNDAGND AGND AGND +1.8V +3.3V +5V_PANEL AGNDAGNDAGNDAGND AGND AGNDAGNDAGND AGND AGND AGND AGND AGND +5V_IP AGND +3.3V AGND AGNDAGNDAGNDAGND OUTOUT C4 A2 C3C2 A1 C1 OUT OUTOUTOUTOUTOUT OUTOUT OUT OUT IN IN OUTOUT OUT IN OUT OUT OUT EBC ININ ININ ININ ININ ININ ININININININ IN ININ ININ OUTOUTOUTOUTIN OUT OUTININ OUTOUTOUTOUTOUT OUTOUT OUTOUTOUT OUT OUTOUT OUT OUTOUT OUTOUT OUTOUTGPIO_P01/SAR2GPIO_P02/SAR3 GPIO_P06GPIO_P07 GPIO_P26/PWM2 VDDCXOUTXIN GPIO_P00/SAR1GPIO_P17/SAR0 NCNCNCNCVDDPGNDVDDPGPIO_P25GPIO_P43 GPIO_P12/PWM3 RSTVDDPGNDGNDVDDCVCTRLBYPASSGND LVACKMLVACKPLVA3MLVA3PGPO[6]GPO[7]VDDCGPO_P03/PWM3GNDVDDPNCGNDGNDNCVDDPVDDP NCGNDGNDNCVDDPI2C_MCL/GPIO_P10 I2C_MDA/GPIO_P11MODEGPIO_P23/PWM1DDCA_SCLDDCA_SDAVSYNC0HSYNC0REFPREFMGNDRIN0PRIN0MSOGIN0GIN0PGIN0MBIN0PBIN0MAVDD_18AVDD_33RXCKNRXCKPGNDRX0NRX0PAVDD_33RX1NRX1PGNDRX2NRX2PAVDD_33REXTDDCD_SCLDDCD_SDAGPIO_P16GPIO_P15GPIO_P14/PWM0 VDDPVDDPVDDPGPO[0]GPO[2]GPO[4]VDDPVDDCGNDGPIO_P27/PWM2GPIO_P24GPIO_P42GPIO_P41GPIO_P04GPIO_P05GPIO_P22SDISCKCSZ LVB0MLVB0PLVB1MLVB1PLVB2MLVB2PLVBCKMLVBCKPLVB3MLVB3PNCNCGNDVDDPLVA0MLVA0PLVA1MLVA1PLVA2MLVA2P SDO GND OUT EBC OUT EBC IN INININ ININ SDAVSS /WCVCC SCLE2NCNC SIGND HOLD#VCC SCLKWP#SOCS# INININININ ININ ININININININ ININININININ IN IN EBC EBC DDSGDD OUT GNDOUTINVINVOUTADJ INOUTOUT IN IN IN EBC OUT 4&.- Scaler : SE657MRH-LF Scaler : SE757MH-LF Analgo Part Inverter & Function Connector
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 for more than five (5) seconds to return the monitor to factory mode. 1. 2. 3. 4.
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 power part and also check whether there is any abnormal output at any of the other output terminals. CN 600 IC 602 IC 601 Diagnostics Yes Check the connection status for the function assy. Yes Replace the IP board.NoIs DC 5V measured at pins 5, 6 of the CN600 connector when pins 3, 4 are 0V? IIs DC 3.3V measured at pin 3 of IC601 when pin 1 is DC 5V? Check the circuits related to IC601. No Yes Check the circuits related to IC602. NoIs DC 1.8V measured at pin 2 of IC602 when pin 3 is DC 5V? Yes Check and replace the IP board. CautionMake sure to disconnect the power before working on the IP board.