Daewoo 42 Plasma - Model DT4280NH

Hello; Whenever there is a thin line one pixel wide is 999 times out of 1000 a bad Plasma panel or in the case of LCD set a bad panel. It will cost more than the set sold for. John

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.
Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts

Your control board needs replaced most likely. Does it work fine on a cool morning when you first turn it on, then develops the line when it warms up? Good indication it is the control board.

If you wish to get some details; visit the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.////

check LCD connector.

The screen does not work properly .Ribbon wire fails.

See if you can center the picture in the setup menu. It sounds like it's just off center.

try this, can't hurt!
http://www.avforums.com/forums/plasma-televisions/462873-black-line-fault-hyundai-hpt4240-fixed.html

st

the way how you described it looks like the screen is cracked but problem can also be in VPB (video process board).But without the model name its very hard to tell you more

Yes.. It's either a Y-board or logic-main board that needs to be replaced and a qualified shop will have no difficulty in determining which one and getting it back on it's feet...
I think you'll be surprised too, that's it's not that expensive, comparatively.
Bill