Question about Samsung SyncMaster 740N 17" LCD Monitor

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720n problem Hi My screen is only about a year old and it keeps flashing - Auto adjustment locked. None of the buttons seem to work, sometimes the menu box comes up but I can't do anything with it and I can't make anything go away. Is driving me round the bend, can you help please?

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  • Anonymous Mar 27, 2008

    Same problem, only my monitor keep changing Magicbright modes constantly, and there's nothing one can do to make it stop. So far i haven't found the solution to the problem, and i can see that there's many people on the net complainig about it. If anyone knows plz help. It's drivin' me crazy...

  • pll8on Mar 31, 2008

    720n and 731n monitors are having the dame problem. My 731n starting doing this after after 6 months of use. If you registered your product after purchase I believe Samsung will replace by UPS'ing a replacement unit to a UPS center your home and you then, after it arrives, take your old unit to the center and drop it off and pick up the new unit - all at no cost.

    Phone Samsung at 1-800-726-7864

  • naddi Jul 01, 2008

    Two days ago we faced the same problem. The monitor is 1 year old. The menu appears and flashes on the screen by itself, the buttons do not seem to work a lot, different options from the menu change by themselves. I tried several things but obviously no one worked. I did the selftesting of the monitor also, the result was the monitor was all right, but the problem remains. We decided to switch off the PC and the monitor from the electricity when not using them, and at switching on after this it is ok for some time, but then the problem appears again. Unfortunately I have not registered the monitor on Samsung website, obviously I have to go to the service and try to use the guarantee. Will inform you on the outcome, but having in mind I live in Bulgaria, I am not so optimistic. Anyway, will keep you informed.



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  • 44 Answers

Better call the company. it's may be a processor problem..

Posted on Feb 22, 2008

  • bero123 Sep 14, 2011

    Problem is in OSD board - hardware part. If you open your monitor, and disconnect OSD board, problem will be gone, but you can't use OSD menu anymore. Or you could try fix little board, replace connector on board - the one that reacts when you push buttons on display. Or just remove connector that is making the problem.



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Related Questions:

1 Answer

Why my montior keep said auto adjustment locked and how would i release from lock?

just go to the settings of your to menu of it and try to find the unlocked.

Sep 18, 2011 | Samsung SyncMaster 720N Monitor

1 Answer

The Auto adjust keeps comming up in the middle of the screen how do i stop that!!!!

unscrew case remove white header plug from back of switches and done but no power light and buttons wont work but display is fine

May 27, 2011 | Samsung SyncMaster 720N Monitor

1 Answer

My brightness menu is locked on the screen and my monitor buttons aren't working .. I'm having a silver Samsung Syncmaster 720N.

OSD Lock & Unlock
When pressing the AUTO button after locking the OSD
When pressing the MENU button after locking the OSD
This is the function that locks the OSD in order to keep the current states of settings or prevent others
from adjusting the current settings.
Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment
lock function.
Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment
lock function.

Basic LCD monitor and TV troubleshooting guide:
Failed TV and Monitors pictures:

Learn about bad caps:

Capacitors kit: he can make you a set of caps for you.

Or just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

May 10, 2011 | Samsung SyncMaster 720N Monitor

1 Answer

Probably not only because I found several forums and the same claim as is my case .. initially function to adjust the brightness automatically .. 100% ... like I keep the button pressed continuously .....

Check out this link below for a PDF manual for your monitor. You can also update your drivers. There is a support here also. Just copy and paste into your browser.

Hope this helps. Let me know if I can help you with anything else.

Oct 04, 2009 | Samsung SyncMaster 720N Monitor

2 Answers

Samsung SyncMaster 720N ...

OK, I've figured it out! There's something wrong with the control chip, so if you don't have it under warranty, here's what you can do:
1. Turn off the monitor
2. Unscrew the face of the monitor
3. Remove the bottom part of the face from the backside, so you can see the chip
(the control chip is located on the face of the monitor, under the buttons)
4. You will see a small white connector about 5mm wide, UNPLUGG it
5. Put the small cable that you've unconnected under the front, so you can close the monitor back
6. Close the monitor and plug it back in

That's it. You won't be able to change your settings (they autoadjust anyway), but you won't have to throw the monitor away!


Aug 01, 2009 | Samsung SyncMaster 720N Monitor

2 Answers

Samsung Monitor 720N

check the resolution of the system make it as 600*800.

Jan 06, 2009 | Samsung SyncMaster 720N Monitor

1 Answer

Samsung prob

Here's a link to a troubleshooting guide

Maybe you should try re-setting it to factory settings.

Apr 04, 2008 | Samsung Syncmaster 17" 720N Monitor

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Samsung 731N Auto Adjustment

Hold menu button for 5-6 sec.
Enable od disable this funnction.

Nov 18, 2007 | Samsung SyncMaster 171S 17" Flat Panel LCD...

4 Answers

Popup on monitor screen

i had the same problem.i called up the service senter of samsung and they were like, press the menu button and hold it for some time.immediately press the auto button.this would do auto lock.i mean auto adjustment lock.that solved the problem somewhat in my monitor.its not a permanent solution but it can help...

Jun 23, 2007 | Samsung SyncMaster 712N 17" Flat Panel LCD...

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