Question about Samsung SyncMaster 740N 17" LCD Monitor

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Syncmaster 740 power supply problem

3 capacitors (820 uF) deformed, fuse 301 dead (probably 3A) and sc on C 231 (5,2 uF - probably). changed the 3 capacitors with 1000 uF, but 3 A fuse burned again. still have a black screen. any idea or a power supply diagram can help. thanks!

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I would check all the transistors (especially the larger ones) for shorts. If you can separate the power supply from the other circuits (such as by unplugging a connector to other boards), I would do this and see if the fuse still blows. If it doesn't, then the trouble is in another area, perhaps the LCD driver circuits.

Posted on Dec 30, 2008

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2 Answers

The screen not appear anything


There should be 3 820uf capacitor that need to be replaced on the power board.

Mar 10, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

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Please help, my monitor is blank.


this problem is releted with monitors SMPS (power supply board)
pls find that a capicitor 470/10v or 820/10v is dameged in secondry
side of sm transformer whitch filter +5v and +14 v is rusted or plucked?
then change it or replace the power supply board.

Feb 12, 2010 | Samsung SyncMaster 740N 17" LCD Monitor

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I have three blown capacitors. they say 820uf 25v. they all solder to the same part on the board. is it necessary to have three of the caps at 820uf 25v. or can they be added up like 820+820+820=2460uf 25v


Hello,

You need to have the 3 capacitors. There is not a 2460uf capacitor, If one of the 3 fail then the other two will still work, if you have just one capacitor and it fails then you have a dead power supply with the first failure.

Buddy
Corporate Computer
www.ccl-la.com

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Hello,

The flashing power button is caused by a blown power supply. If you can solder then you should be able to do the repair yourself. Check out our web site at: www.ccl-la.com We have a step by step repair guide to repairing this model, showing how to open the case and do the repair. The repair requires replacing 5 small parts, about 15 minutes total time. If you don't want to do the repair yourself we do offer repair services, check our site for details.

I hope this helps, if so please rate our solution.

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TRY IT BY RESTARTING OR GO TO SERVICE PROVIDER

Aug 22, 2009 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

No display.


If the capacitor are deformed maybe are in bad conditions,overheated and probably the cause of the problem replace them

Nov 28, 2008 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

How do I open a samsung 740N LCD Monitor


Lift the front frame. You must try to lift it from the inner side using your fingers (no tools , you may scratch the lcd panel). A little force is necessary especially at the corners. Once you lift the panel from all four sides then the corners will come out.

Note: A common problem with this monitor is the psu. A small number of capacitors fails. You will notice 3 electrolytic capacitors have been deformed and if there is no power you will find a small 3A fuse (looks like a resistor) blown.

Sep 30, 2008 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

Syncmaster 740n blinking blue power light + Dell lcd situation


There are two reasons why capacitor blow up is higher voltage than it can take or higher temperature than the mark on the capacitor.When I repair psu I always change ALL capacitors,primary and secondary section.Bad capacitor in primary section is usually reason for overvoltage in secondary.Fuse is in power line of 820mF.As I remember they are paralel connected so follow +line back to the diode.There is a small green component looks like resistor betwen diode and capacitors.
Same thing is with other two monitors princip is the same.

Jul 28, 2008 | Samsung SyncMaster 740N 17" LCD Monitor

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You have problem with the psu.Three capacitors 820mF/25V are dead and there is a fuse 3A worn out

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Hi this is the way how to examine what's wrong with your LCD monitors. After you turned it on and the screen blacked out or stopped working, you have to check that if you can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,

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