Your upper Y-drive buffer board has failed and will need to be replaced. Take it to a repair technician for an estimate if you are not comfortable doing the work.
SOURCE: How do I do a factory reset on an LG 60PS80-UA plasma TV?
There are setting go that will block inputs. Resting these may fix the problem. This link is for the owners manual that has information that may be helpful.
https://www.google.com/url?sa=t&source=web&rct=j&ei=d0qzVPjFJ8rbsATWk4LICg&url=http://www.manualowl.com/m/LG/60PS80/Manual/54846&ved=0CCgQFjAD&usg=AFQjCNFLH5uxdN7LuAdSjo8uWzcfyAK5rw&sig2=g5BIMKYtiO0Mmh6mlr-TFQ
Bob,
If you wish to get some details; check 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" to 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.
SOURCE: How do you reset an lg plasma tv model #50PS80-UA
You should click the reset button 15 seconds,then power off,and power on,it should be ok
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