Question about Samsung SyncMaster 940BF (Black) 19" LCD Monitor

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Samsung 940bf-screen stays black

I have a samsung 940BF pc screen and latley the power button just keeps on flashing while the screen still stays black(it also makes a clicking sound when the light shuts off).It used to start up after a few minutes but now it got worse and it still stays black after a couple of hours. Can this problem somehow be fixed or do I have to buy a new screen?

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Your monitor is having a problem with the power supply. Because of the small spaces in the monitor case heat builds up and causes parts called capacitors to blow. If you can solder you should be able to do the repair yourself. Go to our web pageSamsung 940bf-screen stays black - 2.gif at: and look at the pictures and repair guides. Open your monitor and look for parts that look like the pictures. Replace any that you see and your monitor should be back operational.Be sure to install the new parts with the polarity stripe on the side going the same direction as the bad ones came out. You will need to replace them with a high quality part with high temp value (105c). If you don't want to do the repair yourself we do offer a repair service.

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

Corporate Computer2.gif

Posted on Sep 10, 2009

  • Buddy Mcsparrin Sep 11, 2009


    You have a power supply dieing in the monitor. There are parts called capacitors that blow out because of the heat trapped in the monitor case. When they blow out you get the type problems you have either no power or a blinking power light. If you go to our web site at and look at the pictures you will see what I am describing. You can open the back of you monitor and replace any of them that look like the pictures and you should be back going again. Be sure to resolder the new ones with the stripe on the side going the same way as the stripe on the bad one. Also be sure to use capacitors with a high heat value, the values of the caps will be printed on the side of the bad ones. We carry them in stock if you need to order them, make a list of the bad ones and email me for pricing. If you don't want to do the repair yourself we do offer a repair service $35 + return shipping.

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

    Corporate Computer


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Samsung 940bf-screen stays black? This trouble maybe power supply or inverter boards is defective.
first you can test the voltage of the multr,and then check which part is defective.From can find those parts
if you have any question,please let us know,we sincerely hope we can help you!
you can also check this boards whether suit you:

Posted on Dec 19, 2014

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Posted on Jan 02, 2017

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After replacing screen there is a grayish look during light hours

you replaced the inside LCD screen?
i guess there is a full story here, but...?????
light hours,?
you mean with windows open and the screen goes gray?

some monitors and tv's do that, now. called GREEN MODE.
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elaborate what you see better may be we can hone in on the reasons. and the what you touched inside.

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My 19 samsung computer lcd monitor problem

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