Power on just have lines on left side of screen
If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
SOURCE: LG flat panel plasma with red line
I had the same problem and fixed it by replacing the control board. It's a little nerve wracking, but required only simple hand tools. If you'd like to see detailed pictures of the repair check out my blog.
http://greenrenovation.wordpress.com/du-42px12xc-repair/
SOURCE: the left side of my LG plasma has vertical lines.
It sounds to me like one or more of your buffer boards has gone bad. You will probably have to have it looked at.
SOURCE: LG 42
One of your system boards is failing. Possibly the "Y" convergeance board. The LCD Capacitors will most likely have to be replaced.
SOURCE: thin red vertical lines on left side of 50
this is not an easy fix. the screen ,or the x or y screen drivers are bad .
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