Question about Samsung SyncMaster 740N 17" LCD Monitor

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My SyncMaster 740N will power up but only the top quarter of the screen is visible. The bottom 3/4 contains fine horizontal lines and info can not be seem. All the caps on the circuit board look good. Any help would be appreciated.

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Just see the manual of the monitor or c go to control panel the click on display and then check setting or call the vander

Posted on Dec 22, 2009

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Yes, this is rare but I have seen it before--not fixable if it is what I think it is----It is what is called a Dome effect---the shadow mask in the picture tube is actually contracting and or expanding depending on temperature---

Directly behind the phosphor coating (the stripes that you see on the screen) is a metal screen--the holes or perforations in it line up with the stripes on the phosphor screen.

Some masks either have a material or a defect causing the dome effect----Not likely to be anything else---a Pin amp problem will not usually act the way you describe but a shadow mask inside the picture tube will act exactly that way.

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Vertical lines on screen looks very bad


maybe your TV have a deffective LCD PANEL,cause those are the systoms of the deffective lcd panel..better to put your unit the nearest service cnter or well trained technician to do the job,,goodluck

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1 Answer

There is horizontal lines come in screen moving upward why is that happening its only 1 year old


This is 2008 model year. You need to open it and look inside to see if you do have bad DC filter caps with leaking/bulging tops, this happen after about 2 years.
See pictures of bad caps and failed SAMSUNG monitor due to bad caps here:
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

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1 Answer

740N blank screen


I would inspect all the caps, if you find even one bulging top/leak you should replace them as a set.
See failed SAMSUNG here, use good caps, such as PANASONIC FM or FC series from DIGIKEY.
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Service manuals:
http://elektrotanya.com/?q=showresult&megnev=SAMSUNG megnev2 =% 20 & 740N = & Category = & kat2 schematics

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This monitor contains a latches to open. Its recommended that you use suitable tools and service manual.

If the unit is in warranty its recommended that unit to be serviced by service Engineer.

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Hi,
It happens due to two cause first one is you have any power saver, speaker or any magmatic device near your monitor(screen) and other cause is your monitor going to damage. Please do not keep any things near monitor and check it. I hope it will work fine.

Good luck.

Thank you
Sachidanand

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