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Samsung SyncMaster BX2250, Service Manual

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Samsung SyncMaster BX2250 Service Manual Download Page 22

4-1

4. Troubleshooting

4. Troubleshooting

4-1. Troubleshooting

Set custom mode as follows before beginning a repair. 
• Resolution: 1920x1080 
• H-frequency: 67.5 kHz

 

• 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,Adapter.  
• When 5V is generated but a blank screen is displayed: IC604

 

• When 5V is not generated: CN601

“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.

Summary of Contents for SyncMaster BX2250

Page 1: ...50N BX2450L SERVICE Manual TFT LCD Monitor Contens BX2250 BX2250N BX2350 BX2450 BX2450N BX2450L Refer to the service manual in the GSPN see the rear cover for the more information 1 Precautions 2 Product specifications 3 Disassembly and Reassemble 4 Troubleshooting 5 Exploded View Part List 6 Wiring Diagram ...

Page 2: ... Disassembly and Assembly 3 1 3 1 Disassembly 3 1 4 Troubleshooting 4 1 4 1 Troubleshooting 4 1 4 2 When the power does Not Turn on 4 2 4 3 When the screen is blank Analog 4 4 4 4 When a blank screen is displayed Digital 4 7 4 5 Error Examples and Actions 4 10 4 6 Adjustment 4 11 5 Exploded View Part List 5 1 5 1 Exploded View 5 1 5 2 Parts List 5 2 6 Wiring Diagram 6 1 6 1 Wiring Diagram Main Boa...

Page 3: ...urope samsungportal com China http china samsungportal com Asia http asia samsungportal com Mideast Africa http mea samsungportal com This Service Manual is a property of Samsung Electronics Co Ltd Any unauthorized use of Manual can be punished under applicable International and or domestic law 2010 Samsung Electronics Co Ltd All rights reserved Printed in Korea P N BN82 01098A 00 ...

Page 4: ...he disassembly process 2 When disassembling the monitor do not use any metal tools except for the provided jig 3 Disassemble the monitor carefully as directed in the following procedures Description Photo Screws 1 Remove the stand body shown in the figure 2 Turn the monitor over and insert your hands into the top of the monitor at the center and separate the front cover in the direction of the arr...

Page 5: ...CTION cable and then remove the SHIELD COVER 4 Remove the LCD panel 5 Remove the four 2 screws shown in the figure 6 Remove the fiive 3 screws shown in the figure and remove the Bracket support 7 Remove the main PCB from the SHIELD cover The assembly is in the reverse order of disassembly ...

Page 6: ...ication Q ty SA SNA Remark CS02A BN96 14905C ASSY SHIELD P COVER 50Series 23 6 SECC 1 SNA F001A BN96 14906A ASSY COVER P FRONT 50Series 21 5 ABS PM 1 SA M0014 BN94 03654S ASSY PCB MAIN ATZ BX2250 1 SA M0215 BN07 00795A LCD PANEL M215HW01 V6 AU21507 6bit Hi FR 1 SA R001A BN96 14923A ASSY COVER P REAR 50Series 21 5 ABS HB 1 SA S001A BN96 14867A ASSY STAND P SET LM 50 SERIES ABS BK23 1 SA ...

Page 7: ...10 6 3V X5R 1005 1 SA 6 T0052 2703 000296 INDUCTOR SMD 680nH 10 1608 1 SA 6 HB01A 3711 005743 HEADER BOARD TO CABLE BOX 5P 1R 1 25mm A 1 SA 6 IS01A 1209 001838 IC SENSOR CT1C08 MLF 24P 4x4mm PLASTIC 5 1 SA 6 1405 001233 VARISTOR 30Vdc 5A 1 6x0 8x0 8mm TP 2 SA 6 AR30 2007 000074 R CHIP 100ohm 5 1 10W TP 1608 2 SA 6 BN41 01522B PCB MAIN BX50 Func FR 4 2 MP1 0 1 6 119x 1 SNA 2 BN68 03065B LABEL MONIT...

Page 8: ... 4 SNA 4 Q101 0501 000445 TR SMALL SIGNAL KTC3875S Y NPN 150mW SOT 3 SA 4 0501 002654 TR SMALL SIGNAL 2PD601ASL NPN 250mW SOT 6 SA 4 0505 001089 FET SILICON AO3409L P 30V 2 6A 0 097 0 1 SA 4 0505 002421 FET SILICON AOD464 N 105V 40A 28mohm 100 1 SA 4 Q409 0505 002560 FET SILICON AO6415 P 20V 3 3A 0 15ohm 2 SA 4 IC112 1103 000129 IC EEPROM 24C02 2Kbit 256x8 SOP 8P 5x4mm 1 SA 4 IC112 1103 001310 IC ...

Page 9: ...AVR63 2007 001323 R CHIP 3Kohm 5 1 16W TP 1005 2 SA 4 2007 007132 R CHIP 15Kohm 1 1 16W TP 1005 3 SA 4 2007 007136 R CHIP 4 7Kohm 1 1 16W TP 1005 1 SNA 4 2007 007319 R CHIP 390ohm 1 1 16W TP 1005 1 SNA 4 2007 007463 R CHIP 1 1Kohm 1 1 16W TP 1005 2 SA 4 2007 009923 R CHIP 0 3ohm 1 1 4W TP 3216 3 SNA 4 C258 2203 000236 C CER CHIP 0 1nF 5 50V C0G 1608 5 SA 4 C409 2203 000292 C CER CHIP 0 01nF 5 50V ...

Page 10: ...TOR 24Vdc 1 6x0 8x0 36mm TP 2 SA 3 0201 001059 ADHESIVE SIL 9590 WHT CARTRIGE 0 001 SNA 2 CS02A BN96 14905C ASSY SHIELD P COVER 50Series 23 6 SECC 1 SNA 3 CB02 BN61 06624A BRACKET FRAME 50Series 24 SECC T0 8 1 SNA 3 BN63 07206C SHIELD MAIN 50Series23 6 SECC T0 8 HDMI 1 SNA 3 T0073 AA63 01110C GASKET EMI 42D5 1 0 10 22 45Kg m2 Fabric 1 SNA 3 M0131 AA63 01134A GASKET JD26KO Conductive Fabric 10mm 1 ...

Page 11: ...2563A A S R CHIP 2007 008925 1 SNA 3 BN81 02613A A S BEAD AXIAL 3301 001982 1 SNA 3 BN81 02900A A S ADHESIVE SL 0201 002112 0 006 SNA 3 BN81 02901A A S SOLDER BAR 0202 001695 2 4 SNA 3 BN81 02902A A S SOLDER WIRE 0202 001703 0 001 SNA 3 BN81 02921A A S MLCC CHIP ML59 00005T 2 SNA 3 BN81 03067A A S BAR CODE LABEL ML68 00582L 1 SNA 3 BN81 03176A A S SOLDER BAR 0202 001692 2 4 SNA 3 BN81 03177A A S S...

Page 12: ...N81 05553A A S NUT HEXAGON 6021 000139 1 SNA 3 BN81 05554A A S DC POWER CABLE ML39 00603M 1 SNA 3 BN81 05555A A S DC POWER CABLE ML39 00603L 1 SNA 3 BN81 05556A A S HARNESS SOCKET ASSY INLET ML39 00607 1 SNA 3 BN81 05557A A S HARNESS SOCKET ASSY INLET ML39 00607 1 SNA 3 BN81 05558A A S CASE BOTTOM ML61 00158A 1 SNA 3 BN81 05559A A S CASE COVER ML61 00158B 1 SNA 3 BN81 05560A A S SUPPORT SPACER ML6...

Page 13: ...blue ToC 1 SNA 3 T0527 BN68 00513A LABEL E PASS ALL MODEL YUPO 110G 50X15 1 SNA 3 BN68 01789A MANUAL FLYER WARRANTY CARD Chinese Art 1 1 SNA 3 BN68 02975A MANUAL FLYER CHINA 50SERIES SyncMaster C 1 SNA 2 BN39 01353A CBF SIGNAL HDMI DVI CABLE HDMI DVI cable 1 SA 0 1 BN92 06360A ASSY P MATERIAL S22AJ W W 1 SNA 2 T0214 0203 001595 TAPE OPP MASKING OPP 2 0 075 75 800M CLR 1 68 SNA 2 6902 000061 BAG AI...

Page 14: ... American National Standards Institute ANSI C101 1 Leakage Current for Appliances and Underwriters Laboratories UL Publication UL1410 59 7 With the unit completely reassembled plug the AC line cord directly into a 120V AC outlet With the unit s AC switch 4 first in the ON position and then OFF measure the current between a known earth ground metal water pipe conduit etc and all exposed metal parts...

Page 15: ...move the instrument s ground lead last 1 3 Static Electricity Precautions Some semiconductor solid state devices can be easily damaged by static electricity Such components are commonly called Electrostatically Sensitive Devices ESD Examples of typical ESD are integrated circuits and some field effect transistors The following techniques will reduce the incidence of component damage caused by stat...

Page 16: ... it from being exposed 4 to moisture Otherwise it may cause a fire or electric shock Make sure to turn the power off and unplug the power cord from the outlet before repositioning the product Also check 5 the antenna cable or the external connectors if they are fully unplugged Damage to the cord may cause fire or electric shock Keep the antenna far away from any high voltage cables and install it ...

Page 17: ...1 4 1 Precautions Memo ...

Page 18: ... 2655 V Scanning Frequency Horizontal 30kHz 81kHz Vertical 56 Hz 75 Hz Display Colors 16 7 Million colors Maximum resolution Horizontal 1920 Pixels Vertical 1080 Pixels Input Signal Analog 2 x HDMI with HDCP Analog Analog 2 x HDMI with HDCP Input Sync Signal Seperate H V sync Composite H V Sync on Green Level TTL level Maximum Pixel Clock rate 164 Mhz Active Display Horizontal Vertical 476 64 H x ...

Page 19: ...Sync Signal Seperate H V sync Composite H V Sync on Green Level TTL level Maximum Pixel Clock rate 164 Mhz Active Display Horizontal Vertical 531 36 H x 298 89 V 521 28 H x 293 22 V AC power voltage Frequency AC 110V 130V 60Hz AC 200V 240V 50Hz Power Consumption MAX30W Typ 27W Dimensions Set W x D x H 577 3 x 350 4 x 67 54 mm Without Stand 577 3 x 350 4 x 67 54 mm Without Stand Weight Product Ship...

Page 20: ...GA 1 DCR MEGA 1 DCR MagicBright 3 step 4 step Feature MagicAngle Image Size Magic Bright3 Picture Mode Magic Tune Magic ECO Magic Return Win7 Magic Bright Magiclux MagicECO MagicReturn MagicAngle 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 d...

Page 21: ...Setup Guide BN68 02964A Samsung Electronics Service center Product Warranty Not available in all locations BH68 00261F User Manual BN59 01093A D Sub Cable BN39 00244H HDMI to DVI Cable BN39 01353A Power Cord 3903 000192 DC Adapter BN44 00139C Cleaning Cloth BN63 02368B Stand BN96 14867A ...

Page 22: ... 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 Adapter When 5V is generated but a blank screen is displayed IC604 When 5V is not generated CN601 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 ...

Page 23: ...1 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 Diagnostics Yes Check the connection status for the function assy Yes No Is DC 5V measured at pins 3 5 of the IC604 IIs DC 3 3V measured at pin 5 of IC601 when pin 4 is DC 5V Check the circuits related to IC601 No Yes Check the circuits re...

Page 24: ...4 3 4 Troubleshooting 4 2 1 Circuit diagrams when the power does not turn on ...

Page 25: ... Diagnostics Yes Check the signal cables and their connections Yes No Check input part No Check the circuits related to IC400 No Check the circuits related to CN400 Do output signals appear at pins 8 to 30 of CN400 No Is DC 5V measured at pins 1 2 and 3 of the CN400 Do the Hsync and Vsync waveforms appear at pins 32 33 of IC400 respectively Do the RGB inputs appear at R106 R110 and R113 Is X401 os...

Page 26: ...4 5 4 Troubleshooting 4 3 1 When a blank screen is displayed Analog ...

Page 27: ...4 6 4 Troubleshooting 4 3 2 Waveforms when no screen is displayed Analog ...

Page 28: ... connector of the panel is connected correctly to the Mainboard Diagnostics Yes Check the signal cables and their connections Yes Check and replace the circuits related to 401 No Is X401 oscillating correctly Do the inputs appear at R171 to R176 and R241 to R246 Check input part No Yes Do output signals appear at pins 8 to 30 of CN400 Check the circuits related to CN400 No Yes Can DC 5V be measure...

Page 29: ...4 8 4 Troubleshooting 4 4 Circuit diagrams when a blank screen is displayed HDMI ...

Page 30: ...white screen is displayed regardless of the signals when turning on the monitor Cause This error occurs when only lamp power is supplied and the video signals are not input to the panel due to an LVDS cable connection error Action Replace the LVDS cable or connect the cable correctly so that the video signals can be supplied to the panel A Full White pattern is a feature of a TN panel when no vide...

Page 31: ...asic Service Items to Perform after Replacing a Board 1 Check the PC color adjustment status 2 Input DDC input both of Analog and HDMI 3 Check whether the appropriate MCU code for the model is input 4 Hard power the monitor off after entering service mode and performing a reset DDC EDIT Data Input 1 Use when updating the AD board code 2 Download the WinDDC program DDC Input program and Hex and DDC...

Page 32: ... The SVC Function OSD is displayed To exit the SVC Function turn the power off 3 Safe Mode When the input signal is higher than the supported frequency of the product safe mode gives users some time one minute to change the video card settings to the Recommended Mode settings Service Mode Moving around 1 Press the button to move to other items Panel information Micom version Micom checksum Select ...

Page 33: ...e setting to On or Off When replacing the panel After replacing the panel move to the Panel item and hold down the Menu button for five 5 seconds The Ch No is incremented by 1 and then both the On Time and Cycle are set to 0 This number is incremented by 1 ...

Page 34: ... DDC Manager MTI 2050 version or later 1 Click the Open F5 icon 2 Select Three EDID 3 Select one DDC file do it three times 4 Click Next 5 Enter the serial number and then press the Enter button When inputting one data select one EDID at steps 2 1 2 3 4 5 ...

Page 35: ...g the MCU Data 1 Check the following options Manufacture MSTAR Device Type TSUM16xxx Communication Port DSUB15 Analog External Memory PMC25LV020 2 Click the LoadFile button select an MCU code file and then click the Open O button 1 2 ...

Page 36: ...4 16 4 Troubleshooting 3 Click the Auto Program button 4 When programming and verification are complete hard power the monitor off and then on again 3 ...

Page 37: ...4 17 4 Troubleshooting Inputting the Code HDCP 1 Run the service exe file 2 Click the HDCP button ...

Page 38: ...4 18 4 Troubleshooting 3 Click the HDCP Write button and select MStar_HDCPKEY 4 Inputting the HDCP key is completed ...

Page 39: ...6 1 6 Wiring Diagram 6 Wiring Diagram 6 1 Wiring Diagram Main Board ...

Page 40: ...6 2 6 Wiring Diagram 6 2 Wiring Diagram Main Board 3722 002922 ...

Page 41: ...RTN4 Transmits the lamp current 60mA 70mA generated in the inverter to the lamp of the panel When a problem occurs The Blank Screen error may occur CN601 Transmits the input power of 90 to 263V to the adapter When a problem occurs The No Power error may occur CN100 Connects the function board When a problem occurs The No LED screen and Function failure errors may occur CN200 VGA signal input termi...

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