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Posted 30 April 2015 - 12:18 PM
Posted 01 May 2015 - 06:03 AM
The fact that the effect does not occur on a video playback should lead us to rule out the LCD panel, which doesn't get any different signal between video and a desktop, but are the horizontal dead pixel lines also absent on video material?
Posted 01 May 2015 - 06:23 AM
The LVDS cable carrying the signal to the LCD is a candidate, especially the connectors. They are sensitive to any tarnish on the contacts and a polish up or application of a quality electronic contact cleaner can clear things up.
It is still possible for a fault in video chip or video memory to create a problem like this, as a different section of the chip and memory are used for internal screen drive and external. Video can appear clean as it's injected as an overlay directly into the feed to the LCD. But if video isn't completely clean, more likely LVDS or internal LCD fault.
Edited by Platypus, 01 May 2015 - 06:24 AM.
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