Question about Samsung SyncMaster 740N 17" LCD Monitor

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Syncmaster 740n blinking blue power light + Dell lcd situation

You have problem with the psu.Three capacitors 820mF/25V are dead and there is a fuse 3A worn out
Can you please put some more details that why it happened and whats PSU?
I found the Capacitors where is the fuse.and what shall I change to get it back.
Also can you tell me about dell lcd as I have 15'', 17'' models. I changed the cap in 17'' dell it worked for once then again one of the capacitor is blown and I can see the burnt cap c70...
saadsatti@hotmail.com

will appriciate ur time n concern
cheers

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  • Saad Nawaz Jul 31, 2008

    Thanks SANJIN. Now the problem is to find the capacitors in the market which I coudn't find anywhere in UK market. 820uf 25v is not available on ebay or maplins. what to do..



    Thankfull to you for your response and information.

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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.

Posted on Jul 31, 2008

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I replace 820mf/25 with 1000mf/25 these wil work


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http://www.ccl-la.com/blog/index.php/capacitors/

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