Join Date: Feb 2013
Location: The Outer Limits....Don't trust any air I can't see ☺
Mentioned: 8 Post(s)
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The problem is it ain't working right but like Otto says without the make and model we can't tell anything .
If it is 2 yrs old It's probably safe to assume it is either a Plasma , CCFL /LCD or LED/LCD in any case the diagnosis and repair and especially the parts used will be different from one and other .
Some newer Sony models (and maybe some others) have a "pic off " (picture off) button on the remote that turns off the back light and thus the picture but leaves the sound on , if that's the case push that button while the set is on.
If not try pushing the picture mode pre set or similar button .