Question about Samsung SyncMaster 930B 19" LCD Flat Panel Monitor

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I have a Samsung Syncmaster 930B code BI19BSSB s/n;BI19HVEA102669R when we plug it the power green ligh come ON but the screen stay Black on RGB in I did not try on DVI side could you help me for that Francois Giasson francois@coair.qc.ca

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  • francois432 Aug 10, 2009

    I have a Samsung Syncmaster 930B code BI19BSSB s/n;BI19HVEA102669R when we plug it the power green ligh come ON but the screen stay Black on RGB in I did not try on DVI side could you help me for that I know the green light is flashing also I opened it there is a small electronic boeard attatch to the DVI and RGB plug could it be this board i should chec for cold solder also on an other case they talked about backlight in trouble

  • francois432 Aug 10, 2009

    I have over here everything to solder contacts on PCB

    I am not able to separated screen with all PCB because of 2 grey wires on left side, one up and the other one at bottom

    also at the center they are some loose wire that hold everything

    can we remove them also they are at least 2 PCB wich one would be mostly in trouble one is connected direct to RGB plug

    also where is the ''inverter'' also I have no transfo direct cord from wall to monitor 120 v. i tryed with flaslight and I did not see anything even if it was plug . also i made a mistake the green light is not flashing but it is ON staydy

    can we have the service manuel for inside the monitor to see the drawing?

    if I open this monitor and take pictures of coposants would it be helpfull for you?



    Francois

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3 Answers

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Mostly the screen backlight circuit defected. If you can not DIY repair, send it to a repair store. You can do nothing outside of the monitor.

Posted on Aug 11, 2009

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Hi and welcome to FixYa,

If the Samsung would not likewise work in DVI mode and the computer it is attached to is confirmed to be operational, then the described problem on a Samsung Syncmaster almost always could be:

  • inverter (most likely);
  • power to the inverter or inverter / lamp controller (likely); and / or
  • CCF lamp (cold cathode florescent) (least likely).
All of the above would indicate a backlighting problem and not setting or configuration. A way to verify a backlighting issue is to shine a flashlight at an angle to the screen with the LCD monitor  turned on and the computer it is attached to booted. A dark semblance of the desktop would be slightly visible. Options are:
  • consider a DIY (do-it-yourself) repair only if familiar with electronic components & circuitry, in the use of a DVM/VOM and a soldering iron. It would be an advantage access to a Service Manual or at the very least a schematic diagram;
  • should you be uncomfortable with a DIY, seek the services of an authorized service center (specially if the unit is still under warranty) or a qualified professional.
It must be noted that there exists a possibility that it could simply be a heat related issue or a loose connection on any of related boards, a cold solder issue on the PCB (printed circuit board) or even a component failure (often capacitors) and therefore would not need a board replacement (if the attending tech is willing to do component level repair). Repair cost would then be dependent on the determined fault.

Good luck and thank you for asking FixYa.

Posted on Aug 10, 2009

  • Louie  Role
    Louie Role Aug 11, 2009

    Appreciate your postback and additional information and yes pictures of the different boards would help.

    Service Manual - The Service Manual is available for a fee and would be to your advantage or at the very least a schematic diagram. Sorry but no readily free downloads.

    The inverter board converts the DC supply into a high voltage, high frequency ACV for use of the CCF lamps.

    Having no "transfo" indicates that your version/model uses SMPS (switch mode power supply) where it converts the 120 ACV into different DC voltages for use of the different boards inside. its operation would be very similar to the power supply of a desktop computer.

    Two other significant information:


    • green light not blinking - indicates that the Samsung built-in diagnostics does not sense a fault which makes things more difficult;

    • no dark semblance of the desktop with the flashlight indicates that it is not a backlighting problem; and therefore initially/presumably, the inverter is not faulty.




  • Louie  Role
    Louie Role Aug 13, 2009

    Any development(s)?

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If the screen is totally black & not a slightly dark grey shade then it would appear the backlights of the screen are not switching on. This would be a problem with either the backlights themselves which would mean the screen needing replaced, or a fault with the power supply/inverter board. If the power supply is feeding the voltage to the inverters then there will be a problem will the inverter. If you have access to a backlight tester you can chack the screens backlights & this will tell you if the screen is ok.If you are unable to check these things yourself then if you take to a service repair center they will be able to easily diagnose which area of the monitor is at fault.

Posted on Jul 18, 2009

  • David Low Aug 12, 2009

    Hi Francois, The board with the RGB connector is your main signal board, if you are getting no picture this can be the problem, BUT if you cannot see any signs of your backlights coming on then this will be where your problem lies. Your wires in the middle will be the LVDS connector to the screen for processing the signal. The two wires on the left at the top & bottom are the backlight connectors to the screen & the plug sockets on the circuit board is from the "inverter" . You would need to check that you have the voltage supplies from the power supply to the inverter stage, all the information you have provided ( green light on, no backlight, no display) would indicate that the problem is in the inverter or power supply stage & a circuit diagram would be benifical if you are confident with fault finding procedures.

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The 930B and the 710T use the same power supply/inverter boards. Below is a link to a repair guide for the 710T unit that should get you going in the right direction.

http://www.ccl-la.com/blog/index.php/repairing-the-samsung-syncmaster-710t/

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I have a power light on my Samsung syncmaster 930b but no image at all is this just a lamp issue or is it a dead moniter.


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Feb 02, 2010 | Samsung SyncMaster 930B 19" LCD Flat Panel...

2 Answers

My Samsung Syncmaster 930B was working fine unti I disconnected and then reconnected it to my computer. Now I get a black screen with a roaming box that says, "check signal cable".


Hello
1st Pull all power from pc from the wall.Plug back in and start pc up.
While starting hold down the f8 key and select safe mode.

once in go to control panel and select display.

set resoulution to default 60 hz and screen size to 800 by 600.

Reboot.

You may need to readjust your screen again.

Hope this helps.

Jan 14, 2010 | Samsung SyncMaster 930B 19" LCD Flat Panel...

2 Answers

SyncMaster 930B takes 20 minutes at least to become visable


IT SHOWS THAT THE PROBLEM IS IN THE POWER SUPPLY SECTION OF THE LCD. CHANGE THE CAPACITORS PLACED IN THE POWER SUPPLY SECTION. IT WILL WORK.
DONT FORGET TO VOTE.

Oct 10, 2009 | Samsung SyncMaster 930B 19" LCD Flat Panel...

1 Answer

Monitor will not turn on and the green light just flashes


There's an internal hardware electronic part/s of your samsung syncmaster 930 that is cold soldered / defective. I suggest to bring the unit to an authorized service center to fix the problem. regards

May 29, 2009 | Samsung SyncMaster 930B 19" LCD Flat Panel...

2 Answers

Screen is black and the green light is flashing


Monitor is definitely bad then, could be bad capacitors on the power board but getting it repaired at a shop would cost more then just buying a brand new monitor.


May 15, 2009 | Samsung SyncMaster 930B 19" LCD Flat Panel...

1 Answer

Sumsung 930b goes dim,and flickers after about 3 min.


This sounds like the inverter has gone bad. If the bulb were bad only, you would see a faint image on the screen with a flashlight.

The problem is on this monitor, it will probably cost about $100 or so to take it to a shop to get it fixed, and that is nearing the cost of a new monitor.

If you are a little bit handy, and can disassemble the monitor, you can replace the inverter. The hardest thing about this, is getting the monitor faceplate open. Just use something firm and softer, such as a nylon spudger (this is something you can find online) or you can carefully use a thin scredriver. You just have to be careful, those cases are really tight.

Here is a good guide for general ideas on how it is done.
http://www.instructables.com/id/Replace-LCD-Backlight-Inverter-on-Any-Monitor-for-/

Paul

Apr 09, 2009 | Samsung SyncMaster 930B 19" LCD Flat Panel...

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