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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Hello,
Swollen, Bulged, Bad Capacitor The main cause of this power up problem are bad capacitors on your power if the capacitor is bad
What you need for the opening of the television is Screw driver, Soldering iron(40watts+), Desoldering braid, Soldering wire, and capacitors.
Now lets talk about the specs, capacitors hold 3 important value:
1. The capacitance measured in uF(micro farads) (ex. 2200uF), 2. Voltage (ex. 10v), 3. Temperature (ex. 105°C)
Important Notes:
Flat panel Television power supply capacitors has 10v installed on the board and it is attached to a 12v bus which is causing to bulged.

Look at the bad capacitor and get the right information from it, remember uF, voltage and temperature. Mine, I only change 2 capacitors. It needed two 2200 uF, when I first saw my power supply it was really easy to spot the bad caps. Some Samsung LCD owners did went ahead replace all the capacitors on the power supply to make sure. Now if you’re like me, an inexperience solder, I would not recommend changing all the capacitors because to me it was time consuming for a noob(newbie) like me ^_^.

Few things to take note, always make sure you have the right polarity. Negative part is where the colored stripe on the capacitor.
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If you are qualified. Do this :

1 - Check the power cable.
2 - Check the printer if smells like burn. If yes continue
3 - Check the fuse in the power supply
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5 - Replace the capacitors deformed for equal capacitors

WARNING: High Voltage!! Do at your own risk!!

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2 Answers

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

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

2 Answers

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.

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2 Answers

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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.

Buddy
Corporate Computer
www.ccl-la.com

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1 Answer

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

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1 Answer

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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.

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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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