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My Samsung Syncmaster 941BW would not display, only a flashing blue power button; no on-screen-menu, nothing. I opened it up and the power supply had 9 CapXon brand capacitors. Two (C109 & C110) were bulging. I replaced all 9 caps except the huge 100uF 450V Cap and Presto-Magico....the monitor works fine now. If you are comfortable opening the monitor, removing the power supply card and replacing the caps...you can fix your for about $10 (replacement capacitors). Dave. Thanks for the tip, budmrtn!

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6ya6ya
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Posted on Jan 02, 2017

Starworx
  • 4 Answers

SOURCE: my monitor 940n samsung syncmaster gone in black...

I have just had this same problem. The problem mostlikely is a blown fuse on the inverter board. Mine was blown on the board and also a Capacitor (470nF/25V) was bad beside the Fuse.

I replaced both and monitor is working now again. After install the picture was a little grainy with little artifacts. In another post i found that the Power Supply board needs to be cleaned for unwanted residue. After that picture was fine again.

BEWARE that you need a soldering iron and a steady hand to replace these parts. If you are unfamiliar with soldering at all have an expert take a look at this. The Power boards uses 220v so DO NOT connect it to the Power when opened.

Starworx

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Posted on Dec 17, 2009

  • 732 Answers

SOURCE: I have a Samsung Syncmaster 932b LCD monitor.

savato321, Most black screen lcd monitor owners don't have the smarts to open up their monitors to do a VISUAL inspection of the "switch-mode-power-supply/inverter supply!!!! You're good. Now you will need to know some stuff about electrolytic filter capacitors! First, the "uf" or "UF" means micro-farad! It is just a rating given to express the storage capacity of the device. Next is the voltage rating. A 16v rating means that the capacitor should never be placed in a circuit where the voltage will exceed 10 to 12 volts DC. Your 820 uf cap rated at 25volts will most likely be in a 12 to 18volt dc circuit. Now for temperature rating. All caps have a maximum temp rating. Most clock radios, stereos, will use 85 degree centegrade rated caps. Printers,PCs,monitors, will use 105 degree C rated capacitors. Never replace with lower specification units! You can GO up but never DOWN. If 1000uf 25v is all you can get it's OK. If you can get 820uf 35v units and they are not too big and they will fit on the board sure you can use them. I would stick with the OEM design voltage rating. Electrolytic CAPS are polarized!! You must replace them + to + and - to -!!! If you screw -up they will blow-up!! The wire lead closest to the printed STRIPE on the cap will be the negative and the unmarked terminal will be the positive. If you visit www.ccl-la.com/badcaps.htm you will get more info on recapping your SMPS. You can also watch some DIY videos at YOUTUBE for "lcd monitor repair" that might be helpful. Also visually inspect the SMPS/inverter printed circuit board for "COLD" FROSTY looking solder joints. They should all have near mirror finish to them. Let us know the name of the BAD CAPS you remove from your unit. You may even want to document with pics with a digital camera what you find. Well, good luck guy. 12fixlouie

Posted on Dec 24, 2009

budmrtn
  • 11361 Answers

SOURCE: Hi, I have a Syncmaster

Not very often, it is the main DC filter caps on the primary side of the switching power supply, 100uf 450vdc is correct value. Just cut the wraper off with a razor blade then it will be easier to remove the bad caps.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Posted on Aug 12, 2010

Testimonial: "Thanks for your prompt help. I shall look at the other capacitors as well. Keep up the good work. Thanks again"

  • 2 Answers

SOURCE: Samsung syncmaster 204b not turning on- My

With certain Samsung models, not only do the capacitors go, but the MOSFETS will go as well, possibly a fuse. The MOSFETs are the big bulky black things with a silver tab and three legs. Should be between the capacitors and the transformers. Just pull those both out and test them (Google "test MOSFETS") One is probably bad but they must be replaced in pairs.

Posted on Dec 17, 2010

budmrtn
  • 11361 Answers

SOURCE: mine board dosen't work. I

That caps is for the Main AC side of the switching power supply which supplies about 160vdc (you can measure that voltage on the caps legs) to the MOSFET that drive the step down switching transformer that produces the 5v for logic board and the 12v for the backlights inverter circuits. The power supply is always running even if the power switch (soft switch (momentary)).
So you need to check those two DC voltages without hitting the power on switch, they shoud be present. You can also hook up the lamps to test the power supply function.
Please read my guides to learn more.
Basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm/
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series

Posted on Jun 24, 2011

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