An oval-shaped rainbow-like colour pattern shows first, then, in a few minutes, picture starts to appear from the bottom and gradually extends towards the top thought never completely reach to top edge. When the picture is below the bottom edge, the TV usually shuts off.Flickering occurs all the times.Sounds work OK. The model of the TV is: Samsung TXE2546 Couldn't find anything outside of the TV to adjust verticle or horizontal position.Thanks for your help in advance!
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