Question about Samsung 931BF 17" LCD Monitor

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My lcd samsung 931 bf displays the desk for about 2s then it vomes black

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Look for bad caps first, then the inverter circuits.
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.
http://en.wikipedia.org/wiki/Capacitor_plague
Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
http://www.badcaps.net

Posted on Aug 23, 2010

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Posted on Jan 02, 2017

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HAVE YOU PHYSICALLY PICKED UP THE PHONE AND LOOK ON THE BOTTOM ?? MOST HAVE A LOW, MEDIUM OR OFF SWITCH FOR THE RINGER ON THE BOTTOM OF THE UNIT.

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I have problem with my monitor LCD 931 BW. after turn on the monitor,the monitor display windows but after 4 5 seconds,the monitor will black.but the power at the button is turn on, whats the problem...


You need to try it with another PC first to make sure it is not PC problem, most failures in monitors are due to bad caps as you can see the failed SAMSUNG albums.
Please read my guide and look at the albums so you will have more understanding if it turns out to be the monitor problem.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

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.
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.

Mar 10, 2011 | Samsung 19" LCD Syncmaster 931BW Monitor

1 Answer

My wife's mom bought us a desk top p.c with this samsung 906bw


Well, seems like the CPU is the source of the problems, not the LCD Monitor.

The simple way to check it is by remove the cable from CPU unit, see for any sign such us color pattern moving or any sign.

the other way is, try using other CPU or Laptop, then connect it to the LCD Monitor.If it works, then you need to repair your CPU.

Hope it's working

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Monitor syncmaster samsung 940 BF becomes black after a few sec.


Try to boot the system with safe mode and check whether you are getting display. if yes, need to download latest driver for display card. if No, then check the monitor cable was properly connected or monitor may faulty. Replace/repair the same will solve your problem.

Also check the DPI and resolution configured in display properties.

Revert back for more clarifications or assistance required.

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1 Answer

Samsung SyncMaster 931 BF CCFL voltage only stays up for few seconds at turn-on and then randomly for a few seconds at a time--any simple fixes ?


Robbert_R_V, Have you visited YOUTUBE to search out and view some of the longer video clips of "LCD monitor disassembly" or "LCD monitor repair" or www.ccl-la.com/badcaps.htm site run by "buddymc" on fixya. Do that first!!! FYI !! Also try www.lcdparts.com for some additional info. Here is a hint of a similar TECHNOLOGY that you are dealing with. Have you seen the CURLIE-Q energy-efficent CFL light bulbs at the homecenter stores? They have what is called an ELECTRONIC BALLAST circuit called a CONVERTER! AC to AC. You have a ballast called an INVERTER. DC to AC 800v to 1200v to light-up your thin, straight, tubes hung on the backside of your LCD glass panel! If this info was of some help, please rate this response on fixya. Bye for now. 12fixlouie

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Laptop screens are LCD (liquid Crystal Display, most laptop screen are made up of 5-7 layers with the LCD plate in the back all bound together in an aluminum frame with the backlight installed on the bottom to light the LCD up. Thses can be disassembled and the inner plate replaced, but it is cheaper to just replace the whole unit.

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2 Answers

Samsung LE32R87B


The fact that this is on all inputs suggests that teh screen is faulty, i would bring it back and get it replaced.

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