Question about Samsung SyncMaster 204B 20.1" LCD Monitor

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Samsung syncmaster 204b

My screen just developed a tiny black horizontal line all the way across it. Restarting the computer does nothing. If I refresh the monitor the line goes white them back to black. It is about 3/4 of the way up from the bottom. Whats up?

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Re: samsung syncmaster 204b

Yes. There is no vertical deflection. The circuit that controls vertical deflection is bad. This is an easy fix for a TV tech. Take it to the TV repair shop.

Posted on Jun 20, 2008

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Posted on Mar 08, 2008

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This is a common problem with the Samsung 204B units that have been in service for a few years. Parts called capacitors in the power supply start failing and causing the board to not start correctly. The blinking power button is just the power supply restarting over and over. The monitor is easily repairable, you just need to replace the 5 capacitors that have failed. Here is a link to a page that shows how to open the monitor, get to the power supply board and what to replace.

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


Sep 17, 2011 | Samsung SyncMaster 204B 20.1" LCD Monitor

1 Answer

SyncMaster 204B - when pc goes into blank screen mode (normal) the monitor does go black (normal). But when waking up PC the monitor just start flashing the screen extremely fast, progressing slower and...


Yes, The repair is simple, it requires changing out 5 capacitors. We have a full repair guide posted on our web site at: We also have a parts kit available for $12 shipped.

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

Corporate Computer

Mar 03, 2010 | Samsung SyncMaster 204B 20.1" LCD Monitor

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How i can fix my 21.5" computer samsung monitor, the display is slightly stretched

Set your screen resolution to 1600 x 1200, the native resolution of the screen.

Oct 11, 2009 | Samsung SyncMaster 204B (Silver, Black)...

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I have a 204b moniter that the lower half of the screen faded to black then shows two half screens that are filled with so many vert lines that you can't see whats on the screen.

the screen is toast. if its black and not showing whats suppose to be on the other half.if you tried restarting the computer and unplugging the monitor and it is still happening then there is nothing to do. monitors are not built to last long, the cheap ones. it is good to get one with a good warranty because the pixels go out.

Sep 29, 2009 | Samsung Computer Monitors

1 Answer

Samsung SyncMaster 204B The blue power button is on but the screen is black. When I turn it off and back on it shows the screen for a second then goes black. Can you please help me. Thanks

Got the same problem, happened yesterday for me, Did some research and it looks like its bad capacitors in the back, check out this page for more information... i'm taking mine to an electrician to fix today... luckily he's related and should be able to fix it on the cheap...

Apr 02, 2009 | Samsung SyncMaster 204B 20.1" LCD Monitor

1 Answer

Black Line bottom of LCD Monitor

May be a manufacture defect or the Screen goes wiped out during transportation.

Call to the support for warranty issues immediately.


Sep 26, 2008 | Samsung SyncMaster 204B 20.1" LCD Monitor

1 Answer

Ghosting, Flickering, Green Sparkeling Lines, Color Washout.

I had a similar problem on a different monitor and fixed the green sparkles by selecting a lower refresh rate.

Aug 15, 2008 | Samsung SyncMaster 204B 20.1" LCD Monitor

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