Sounds like the circuit board may need to be replaced. Mine did a similiar thing only my picture turned upside down, screen went blank yet had good voice. Samsung tech said the 2 circuit boards were bad and had to be replaced at a cost of $780 in parts plus labor. I bought a new LCD TV, not Samsung.
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Check the input connections. If Ariel connection, or other video input connection from any external source have loose contact, or wire broken, this type of interference can occur to picture. Gopakumar Gopalan Google
very common problem you have a verticle problem either you have filters that are leaking or your verticle ic is going bad in the shop depending what size this unit is and weither it is a tube set ot a lcd or plama or led
I have a similar issue. Sometimes the entire screen goes black and sometimes only one-half - either the top or bottom half goes black. The only solution we have found is to gently tap the TV (usually the front side) and the picture will come back for awhile. It almost seems heat related as it only goes out after the first 10 minutes of use. There must be a fix to this.