Question about Samsung SyncMaster 740N 17" LCD Monitor

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Samsung Syncmaster 943n Black Screen when power is on want to know how and want is needed to fix

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Here are the service manuals:
http://elektrotanya.com/?q=showresult&megnev=samsung&megnev2=943&kategoria=monitor&kat2=all

Please read below before DIY repair.
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 (they should be replaced in a set), 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 SAMSUNG 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.

Basic LCD monitor troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Learn about bad caps: 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 Nov 11, 2010

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I have Samsung syncmaster 943N and have problem with vertical line in left corner of the screen??


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My SyncMaster 740n is stuck in power save mode. I have rebooted, unplugged power and vga chord...the thing was on and all of a sudden POOF it was black. The power light blinks every second or two.


zolio, Monitor most likely has "switch-mode-power-supply" problem!! click on blue highlighted "SyncMaster 740N" and read about similar BLACK SCREEN of DEATH failures and how to fix them!! Your monitor I suspect is no different than any other LCD with "cold-cathode-fluorescent-lamps" for backilghting that fail to light-up. You can even visit YOUTUBE for videos on fixing BSOD problems!! Also a ton of stuff here on FIXYA!!! Just read and follow some of the links!! you WILL find out about everything you DIDN'T know of HOW and WHY lcd monitors fail. And better still, LEARN how to do the repair work or contract out the work to a Technician or other monitor REFURBISHMENT depot. Have you tried SAMSUNG to do warranty work? If this response was of some help please rate on FIXYA . 12fixlouie

Nov 12, 2009 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

My Samsung 943N LCD monitor will work for 1 second and then goes black. When I choose the extended desktop option, for example, it will flash my desktop on the monitor for a second and then go black. I...


becky_bitz, Do this first! It is only a "rude&crude" evaluation of the state of the monitor's "switch-mode-power-supply" Reconnect 943N to a fully booted KNOWN GOOD pc that has WIN-desktop showing. Then and only then, turn on the 943N and note what happens. After the screen goes BLACK, shine a bright flashlight at the lower left corner to try and see if the WIN-START button can be seen or other desktop icons are being displayed even though the LCD panel appears to be black! If you see a very faint image the SMPS is only in partial SHUTDOWN and is still powering the VGA/LCD interface board to display the images. If you see NOTHING, then SMPS is in full SHUTDOWN mode. In either case, your monitor's SMPS is trying to save itself from a catastrophic, nonrecoverable failure.(smoke,fire) Becky, fear not the those last two words. In fact your words "work for 1 second" means that the 943N is a good candidate for repair even if to keep as a working spare! To help in your decision making process you should pay a 30 minute visit to YOUTUBE and search out and view some of the longer video clips of "LCD monitor disassembly" , "LCD monitor repair" and also visit some websites you find here on fixya. www.ccl-la.com/badcaps.htm , www.lcdparts.net , www.badcaps.net are just a few that will point out what is causing your "cold-cahtode-fluorescent-lamps" to fail after 1 second. If you still need help then do a comment to your original post and I will try to help you. lmistyrel @ aim.cm or 12fix louie on fixya. If this was of some help please rate on fixya.

Nov 08, 2009 | Samsung 943N LCD Monitor

1 Answer

Samsung


Please try to connect your monitor to another PC, if still the problem exist, then probably an internal electronic part/s is cold soldered / defective, which I suggest to bring the unit to an authorized service center to fix the problem. regards

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Flicker then display goes black


your monitor got trouble at:
1) monitor inverter board components fail like capacitor or MOSFET diver, it can repair or change this parts to fix.
2) there is disconnection between the inverter and CCFL lamps
need to check by technician, it could be fixed,
3) check the DCpower supply board capacitors swelling which need to reaplace, and fix it.
all steps need to do and fix it well.
hope help you something fixed, please take a rating let me know how much helped you thanks! keep in touch your question

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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...

http://pavel.kirkovsky.com/blog/2009/03/samsung-syncmaster-204b-repair/

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