Question about Samsung SyncMaster 204B 20.1" LCD Monitor

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Flickers on start up and very slow going to normal viewing colors and lighting

When i turn on my pc and monitor the monitor stays black for maybe 2 minutes, eventually you can see the picture dim and flickering. after maybe another 2 minutes the picture is viewable but the picture is weak. after another 5 minutes the picture is ok. but if i shut the monitor down for say maybe 5 to 10 minutes it does the same thing again. What is wrong with my monitor?

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  • Anonymous Aug 01, 2008

    on start up or after powersaver shutdown it takes a while before the screen resumes full brightness and contrast

    Don't know how to fix that.

  • milercards Oct 11, 2008

    Monitor remains black at start up, or flickers and then might eventually come on. If I turn the monitor power button on/off a few times it will usually begin to flicker and then fire up - sometimes full on, sometimes dimly, then brighten as it "warms up"

  • iron1958 Oct 26, 2008

    I have the same problem,,, description of yours is ditto on mine. If I unplug it then plug it back in (at the back it helps. I have a couple of times just tapped the back area around the power cord area ans it came back up. I am suspecting a bad cap in the power supply. At first I was thinking maybe cold solder joint, I haven't done any taking apart to look at.

  • rayefan Nov 05, 2008

    I have this same problem and it is driving us CRAZY! I have had this monitor for almost two years, I think! But, within the past couple of months this has been our problem.... AAUGH!

  • Richard4242 Nov 19, 2008

    I have the same problem only it finally quit entirely!
    Turn it on, after a minute you see it getting brighter as it flashes on
    and off. After a few minutes it gets steady but still dim. Then a few minutes later it is as good as new.... but now it is DEAD. Gone, Kaput... Nada.. zip.
    I will open it and dig in this weekend with my test equipment and
    see what I can find. If I find a single responsible part I will let oy la know.
    I assume it is a power supply issue - this looks like a bad or failing
    capacitor issue of some sort.

  • andy22nj3 Jan 16, 2009

    My monitor just started doing this, but no flickering. I just dark on startup and dim at log in, but after a few minutes it's ok. I'll check Samsung's website.

  • Anonymous Jan 29, 2009


  • andy22nj3 Jan 30, 2009

    I called Samsung. My monitor is under warranty. I will be send my monitor for repair. It's been two weeks and I still do have the shipping label.

  • mark204b Feb 20, 2009

    There is nothing we can do to fix this, because the backlight needs replace by the factory. This monitor has been discontinued but Samsung will more than likely offer you another if yours is still under warranty as they did for me. I dont suggest opening the monitor up therefore killing your warranty. So..... the answer is the monitor is burning up and needs to be replaced by Samsung. Go to their site and talk with them and they will help you. = ) good luck. I recieved my new monitor within 1 month,,, we traded new for old over the counter at UPS.

  • Anonymous Feb 27, 2009

    Same issue - after turning on, or exiting powersaver mode, the screen is black and SLOWLY fades in, with some real flickering. It's happening more and more lately - I think it may be getting to be time to exchange it.

  • Anonymous Mar 01, 2009

    Great diagnosis and recommendation. What if its not under warranty... has anybody tried a manual fix. Probably cheaper to replace than fix anyway... I bet. :(

  • Anonymous Mar 01, 2009

    I had the same problem. I replaced C110 and C111 with 1000uF 35V electrolytics. The only challenge is getting the bezel split open. Use a small screwdriver and gently split open bezel and back cover. Starting at top side and work your way down both sides to the bottom. Small cable harness is connected to front switches that needs to be disconnected.

    Monitor now works good as new.

  • kb1cih Mar 03, 2009

    I noticed my 204b was a bit dimmer, and was flickering a bit when i turned it on yesterday, but brightened up to normal after a minute or two. I've had the monitor 4 years with no problems until then.
    A few more on/off cycles have verified that it wasn't a fluke, so cracking the case will be in my future soon i'm guessing.

    A big thanks to Guest (or possibly Richard4242) for recommending C110 and C111. When it finally gets to be a problem, i'll crack the housing open and replace them. I have become a Samsung LCD fan since then and am glad it's something i most likely can fix for a couple dollars. Thanks again guys!

  • kghongaku May 11, 2010

    anyone know how to open the case? there are no screws?


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FIXED: I took the advice to replace C110 and C111 with 1000uF 35V electrolytics ( $3.18 and a pretty easy time prying open the case with a medium-small flathead screwdriver, disconnecting a few connectors, 4 silver screws (2 on the left & 2 on the right of the LCD), 2 black screws on the back of the metal case, 3 black and one brass screw on the PC board, and it works like new.

HINT: Be sure to insert your new capacitors correctly (positive and negative sides). The capacitor has + and - sides (the - side was marked on mine). The bottom of the PC board (where you apply solder) has a + marked on the positive side.

For the faint of heart: I am an inexperienced and HORRIBLE solderer and know close to nothing about capacitors, resistors, etc. So, if I can do it you can too!!!

Posted on Mar 03, 2009

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Repair verified! My local elecronics supplier had the correct 1000uf caps in stock, and my 204b is good as new.

Posted on Mar 03, 2009

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I sent my monitor back to Samsung for repair.

Posted on Feb 15, 2009

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Had the same problem here !

C110 and C111 on the power supply unit are busted.
I replaced then with 2 ELCO's from 1000 picofahrad 25 V.

Voila!! runs like new.

Posted on Jan 30, 2009

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  • 202 Answers

It may be the fault of your picture tube.

Posted on Jul 28, 2008

  • Bailey's Appliance Service

    It's an LCD Flat Screen Monitor. There is no picture tube.


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