Vertical, pencil-thin blue line appears after 10 minutes of viewing (any source)
This TV is about 20 months old and the problem first began about 3 weeks ago. After about 10 minutes of viewing, a vertical line appears. It originates at the top of the display, 3" from the left edge and extends down approximately 1/2 the height of the screen. The line is about the width of a Sharpie pen and blue color. The line appears in both broadcast and DVD source material. If the TV is turned off for several hours, the line will disappear temporarily. It's very consistent.
I discussed this problem with Hitachi customer service. Other than checking and cleaning the control cable connectors that tie the AVC to the display, they're only advice was to call a service center.
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Re: Vertical, pencil-thin blue line appears after 10...
I would suspect a connection breaking down as the set heats up. A shop will probably have to put the set in a stand to hold it while they check for loose connections or defective components inside. Not a DIY job by any means. If this line went completely through the picture either vertically or horizontally and stayed there then this would have indicated a failure in the Panel itself. A thin Line any where on the screen consisting of one pixel in width is a Panel Failure according to Hitachi.
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Vertical scan section circuit fault. Check and replace damaged component/s at its vertical scan output section circuit. If you wish to get some details, check the site linked here. Pull up older posts. Check the site in 'Mosaic' view. It will make search easy. http://electronicshelponline.blogspot.com/
First you must clean connector contacts between plasma module and driver boards, if not solve the problem and continuing increment of wide red line, may be you must change plasma module to solve this problem,
Had this same issue on right side of 52" about 1 inch from side but had 3 vertical lines that disappeared after 40 minutes. Have Samsung LNT5265FX/XXA and about 16 months old. LCD Panel itself had to be replaced to fix it, fortunately had extended service plan
There are bad solder connections on the vertical IC. This is a small flat IC attached to a heat sink. It should have about 9-11 pins and may be marked LA7837 or something similar. Resolder the pins on this IC and that should resolve the problem.