Faint horizontal lines from top to bottom after an hour of use...

The TV may be picking up stray radiation from another piece of equipment, try disconnecting and unplugging all other digi/cable/dvdplayers/phones etc. to isolate the offending article

db:: 4.31::Diagonal lines on tm2 screen? fz - Hivmr

www.hivmr.com/db/fzap9jk8dp87mcjk3cc9jsp7fzxk7pz1

There are faint 45 degree diagonal lines covering my brand new tm2 LCD ... with some static looking diagonal lines going from bottom left to top right. .... DB:3.01:Dv6113 Us - Computer Freezes Showing Diagonal Lines On Screen aj ... Also there arediagonal lines that run across the screen at about a 30 degree angle.

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FZ190: Faint Diagonal lines on screen? ' NotebookReview

forum.notebookreview.com > ... > VAIO / Sony

Generally horizontal lines are caused by the panel failing, you can try a new tcon but I don't think it will help.

If I'm understanding this correctly, you have a faint line, horizontally on the screen that moves vertically right? if so, It's AC noise. If you are mechanically inclined, the quickest fix is to replace your current AC outlet with a GFI outlet. Works 99% of the time. Hope this helps.

From your description, the sound you are hearing is the inverter(s) that drive the back light for the LCD screen/module.
The inverters mounted on the back side (one lower right and one left side) of the LCD screen/module. They are under the sheet metal cover/shields.
The inverters are going out and or the LCD screen/module is going bad too.
That LG TV has only a 1 year on parts and labor from the date of purchase, but you could call LG and ask for their help for such a new TV. They might do it under a warranty, for little or no cost to you.
I hope this information has helped you.
Good Luck.

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

what kind of monitor? Have you replaced the cable? Try the pc on another monitor. You need to see if it's actually the monitor or the video card. replace the broken or defective part.

yes

Very easy Fix, The problem is the cable box is not grounded properly. (not your fault) Go to the Local store and get a Plug adapter, just to change the TV plug that goes into the wall or surge protector from 3 to 2. Trust me on this....

Best regards
CircuitCity

This is usually caused by a problem in the Horizontal Output section, around the Horizontal Output transformer usually a capacitor or diode going or gone faulty... the line you see are the Horizontal "Retrace" lines that are useually "Hidden" when the circuit is OK..