Which part to replace i have a dark vertical line on my screen

SOURCE: LaserJet 2300D - dark lines vertical across document

Change toner cartridges again

SOURCE: dark vertical lines on tv screen

If under warranty then of course use that.
This is a display problem. One solution someone knowledgeable in electronics can try.
This problem can be caused by a bad connection fitting of the flat cables on LCD controller board. Dis-connect the flat cables from the LCD controller(T-CON) and carefully reconnect them. Try the unit before reassembling the back cover. You may have to disconnect/reconnect several times to show improvements if this is the problem.

Eric Rotmil

• 587 Answers
• Posted on Aug 19, 2009

SOURCE: 42 inch samsung plasma tv black vertical lines

Hi, Depeending on the thickness of the lines matters. If the lines are Black and about 1-2 inches thick it may be a bad bottom buffer board or a bad panel (screen).
If the lines are thin 1/16 to 1/8 inch it is most likely a bad panel.
You can open up the set and depending on the model, see the thin board/boards running across the bottom with ribbon cables going to the panel. You may be able to attempt reseating the ribbon cables, but be careful as some retainer plugs break very easy.
If the lines are thick black and the reseating doesn't correct it you may be able to buy the coresponding buffer. Unfortunately some bottom buffers are actually part of the panel. If you are not comfortable taking it apart then call a professional but be aware labor charges start around $200 not counting parts, panels start at $600 up to over $1000
hope this helps
Thanks
Eric

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SOURCE: My screen has dark vertical lines

try changing ur screen resolution to a higher value otherwise change frequency of your monitor

SOURCE: About 15mm dark hadow vertical line on the page.

Sounds like its time for a new drum/print cartridge. When it get worn you start to get poor quality prints and sometimes lines. COule also be scratched and transfering the line on the prints but in either case needs to be replaced.