Samsung 204B LCD Monitor Repair

October 30, 2009 by
Filed under: Uncategorized 

If you have a Samsung SyncMaster 204B monitor that either has a blinking power light or a very dark picture then this should help get you back running. There are 2 different versions of the power supply board and you will need to check your version before ordering. The standard power supply is the IP-43130B as shown in this guide, the other power board is the IP-58130 (NP-20) which is the 214T power board. The monitor dis-assembly is the same for both versions of board. You can check the capacitors in the center of the board, if they are 680uf then this is the correct kit, if they are 330uf then use the 214T parts kit available here.

Below you will find a full walk thru on repairing your LCD monitor. To do the repair you will need the following tools: Soldering iron, de-solder braid, Phillips screwdriver, flat blade screwdriver. You will also need the following electronic parts: Qty(2) 680uf 25v, qty(2) 820uf 25v capacitors, qty(1) 330uf 25v. We sell a repair kit with all of the parts for $12.00

If you don’t want to do the repair yourself, use the service request link above. Most monitor repairs run $30-35 plus return shipping.

Here we have a non functional Samsung SyncMaster 204B 20″ LCD monitor. This unit has a fast blinking power light. We have repaired several of these in our shop and they all have the exact same issue with the power supply. If you would prefer to watch a video on this repair it is available HERE.

First you need to remove the power cable, signal cable and the stand. To remove the stand you will need to remove the 2 thumbscrews, they are circled in yellow.
Once the base is removed you can easily remove the VGA or DVI signal cable and power cord. When working with a flat panel display it is best to put a towel down on your work space so you don’t scratch the front of the display.
To remove the cover you will need to use the small flat blade screwdriver. Across the bottom there are several release tabs, if you insert the screwdriver into the slot the case will release. When you get one corner released just work your way around.
After the screen unit is removed from the plastic case we can get down to the repair. We need to remove the power supply unit. You will need to unplug the control panel, circled in red. The remove the 6 screws that are holding the metal shield in place (yellow circles).
Now unscrew and remove the power supply board. To remove the board you need to unscrew the 5 screws circled to yellow and unplug the 2 backlight plugs and the signal cable, all circled in red.
The 5 capacitors that need to be replaced are circled in yellow. We have already replaced the capacitors in this picture. Before replacement all of these caps had very noticeable bulging tops.
The replacements are as follows:
C301 and C302 680uf 25v – yellow circles
C111 and C110 820uf 25v – red circles
C112 330uf 25v – blue circle
Be sure to reinstall the caps with the polarity stripe going the same direction as the old ones come out.
After the parts are replaced just reverse the procedure to reassemble the case. Now apply power and you should have a fully functional monitor again.

Updated 2/11/2012: We have added videos of this repair.
Part 1: Dis-assembly

Part 2: Board repair

The capacitor kit used in this repair is available here.
Part 3: re-assembly and testing

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23 Comments on Samsung 204B LCD Monitor Repair

  1. Mike on Sat, 1st May 2010 11:39 am
  2. Thanks loads for this.
    Saves me buying a new monitor.

  3. Laz on Sun, 6th Jun 2010 10:20 pm
  4. the only really hard part was opening the case; I found that firmly running an expired credit card in the seam along the long side of the case allowed the snaps to clear so the front part could lift off. I had to run the card all the way around before the two parts could be separated without breaking or damaging anything.

  5. Sharma on Thu, 26th Aug 2010 10:45 am
  6. Is this the problem also when the monitor takes some time to come to full brightness ?

  7. admin on Wed, 8th Sep 2010 8:51 pm
  8. Yes, The slow brightness is because the power supply board is taking a long time to get to full output voltage. The kit we have should get you back to full brightness in no time. You can get it here:

  9. Justin on Mon, 13th Sep 2010 8:44 am
  10. I was having this same problem so I ordered and installed the caps. Now all I get is a white screen. Did I do something wrong or did a different component now fail? Thanks for any suggestions.

  11. admin on Tue, 14th Sep 2010 7:56 pm
  12. Check the cable from the the video board to the display panel – its the flat cable about 1.5″ wide. If this cable is no connected securely then it will cause a white display.

  13. yuri on Sat, 16th Oct 2010 1:40 pm
  14. I am thinking about fixing the 204B as I have a slow (1-2min) and flickering start. However, I also have a pixel-thin line left to right at the bottom of the screen – will this repair fix it?

  15. CCL_TECH on Mon, 18th Oct 2010 1:14 pm
  16. The thin pixel line is not caused by a power issue, its caused by a faulty driver transistor on the LCD panel. This type of fault is not correctable except by swapping the panel out which is expensive.

  17. peregrine48 on Fri, 17th Jun 2011 2:22 pm
  18. Wow, Thanks Guys!

    This was my first real attempt at soldering.

    $12 to fix what was originally a couple hundred dollar monitor that I really liked.

  19. Frank Adams on Wed, 7th Mar 2012 2:08 pm
  20. It appears the two capacitors circled yellow are installed the wrong way round. Also, are you sure they should be 680uF as the ones in my monitor are 330uF. My electrolytics have a blue felt pen line on them .Would that be from the factory? It doesn’t look like they have been replaced at some time.

  21. CCL_TECH on Wed, 7th Mar 2012 3:35 pm
  22. Yes, There are two versions of the power supply board in the Samsung 204B. The beginning of the repair guides states this and shows the correct values for each board.

  23. WayneMV on Sat, 5th May 2012 10:22 am
  24. Is there a way to tell which revision of the power supply board one has from the serial number tag on the outside of the monitor, without having to open it?

  25. CCL_TECH on Mon, 7th May 2012 10:57 am
  26. Unfortunately no, Samsung swapped the power supplies around on that model when ever the standard power supply was out of stock so it could change within a production run without any notification.

  27. Eric B. on Mon, 28th May 2012 6:14 pm
  28. My SyncMaster 204B has been blinking and slow like this, but today it also came up with a red screen. I did some screen adjustment so that it’s not a bright red, but now has a slight blue tint. Would these failing capacitors cause the red screen as well?

  29. admin on Mon, 28th May 2012 8:11 pm
  30. Bad capacitors can cause that type of problem but it may also be caused by failing backlight bulbs. When the bulbs start failing they will put out red or pink light instead of pure white light. Check the capacitors in the unit and see if they are bulging, if no then the issue will be the back lights. They bulbs are replaceable but it does take a bit to replace them. Check the caps first and let us know what you find and we can go from there.

  31. newbie on Sat, 8th Dec 2012 10:20 pm
  32. My Samsung 204B would not start properly and I had to keep clicking the on/off power button multiple times before it would stop flickering and turn on. It got worse and worse and I was about to toss the monitor. My 11 yr old son told me we should try to fix it since it was a hi quality display. We had a chance encounter with this website, figured the symptoms matched the described issue on your website and purchased the repair kit and also the soldering iron kit. I have never done any soldering before. After reviewing a few youtube tutorials on soldering and your superb repair video for this display, my son and I undertook the repair today. Viola! It worked. I’m delighted because not only is my monitor working like new, but I also had a great time with my boy and I’m sure he’ll remember the project. Thank you Corporate Computer!!

  33. admin on Tue, 11th Dec 2012 5:23 pm
  34. Hello,
    We are glad to hear that your monitor is working well again and we are very happy to hear that you and your son had a good time doing the repair. Its always great to hear success stories but its even better when a father and son have a good time with a project.

  35. Andy on Sun, 10th Feb 2013 3:53 pm
  36. Thanks for this great guide!
    I also have this red screen issue and changed the caps. Unfortunately the problem stays the same.
    The OSD appears in normal colors. MENU Button didn’t work, Power Button only works when no display cable is connected.

    Do ya have any ideas?

    Thanks so much!

  37. Dave on Tue, 5th Mar 2013 12:36 pm
  38. I need the base and tower assembly. Anybody got onte?

  39. Dave on Tue, 5th Mar 2013 12:38 pm
  40. I need the base and tower assembly. Anybody got one?

  41. Dominic on Fri, 31st May 2013 4:41 pm
  42. Ok so I have one of these monitors! However it has the IP 45130 board in it. This is laid out exactly like the ip 43130 as shown in this guide but the caps are the same values as the ones on the IP-58130 (NP-20) which is the 214T! However, the board layout is totally different! I presume I should replace caps, like cap with like? On that score the 214T guide and cap set mention a 6th cap:a 47uf 50v. I can find this cap on my board but the instructions for the 214T only tell you to replace the 5 other caps. The 204B guide and cap set do not mention this 47uf 50v cap though I think I can see one in the picture above, just left of the yellow block which is left of the 820uf 25v caps. Any advice? This 47uf 50v cap does not appear to be blown! I’m really excited that I may get this monitor working!

  43. muresan on Tue, 8th Nov 2016 6:34 am
  44. Hi
     if you put a capacitor 470uF 35v instead of 680uF 25v is there a problem?

    thank you in advance

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