SOURCE: Sharp 42" flat screen LCD T.V.
You have a bad buffer ic,which is part of the lcd panel.Definiately call sharp to get it repaired.If it doesn't have a warranty,persistence through sharp will get you results.
SOURCE: 42" Philips plasma screen goes black
You have a Ysus problem. Sounds like a cold solder joint or loss connections on ysus main board.
SOURCE: Picture reduced to 1/4 on a black screen
Picture is reduced to a straight horizontal line across the center of the screen.
SOURCE: model 42mf231d/17 42" plasma
If the loss of picture is either on top half or bottom half of screen. there are y buffer boards that go from top to bottom on left side of screen when looking at back that control those sections. when there is loss of half of picture then buffer associated with that area would be at fault and would need to be replaced. when i see a degrading symptom such as loss of picture on top half or bottom half leading to no picture issue normally you would check heat syncs on y sustain board and if not heating up after a few minutes of being turned on would recommend replacing y main and both y upper and lower y buffer boards as they complete a circuit
SOURCE: 42 inch samsung plasma tv black vertical lines
Hi, Depeending on the thickness of the lines matters. If the lines are Black and about 1-2 inches thick it may be a bad bottom buffer board or a bad panel (screen).
If the lines are thin 1/16 to 1/8 inch it is most likely a bad panel.
You can open up the set and depending on the model, see the thin board/boards running across the bottom with ribbon cables going to the panel. You may be able to attempt reseating the ribbon cables, but be careful as some retainer plugs break very easy.
If the lines are thick black and the reseating doesn't correct it you may be able to buy the coresponding buffer. Unfortunately some bottom buffers are actually part of the panel. If you are not comfortable taking it apart then call a professional but be aware labor charges start around $200 not counting parts, panels start at $600 up to over $1000
hope this helps
Thanks
Eric
I’m happy to help further over the phone at https://www.6ya.com/expert/eric_ab7c09ec01841771
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