Before powering it off it was intermittently changing input source all by itself. Now won't do anything in response to any controls (remote or on unit)
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: can change the sound with my remotes
I recently bought a GE universal remote control, SKU: 24950, that has a control code for the AOC A17W221 TV. I bought mine at Target. You can check online to see if your local store has one before you go there. It's also listed on the GE site under consumer electronics accessories with a price. Don't know if they sell it online, though.
SOURCE: Blank screen except for a vertical grey line through the middle
This is a lcd. there is no yoke. it's a bad panel.
SOURCE: cannot change input source for tv
i would try the abvious first, unplugg the tv from the ac outlet and wait for a few seconds then try turning tv on see if the problem is solved, if not it might be that the key board panel needs replacing.
SOURCE: panasonic viera with vertical lines down the screen
Either the buffer board is bad or the plasma panel,sometimes it coult be bad connections on the interconnect ribbon cables from the plasma panel to the buffer boards.
I will need the model number of your set to assist you with the most probable cause of the problem.
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