Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Defective picture tube

Shortly after hooking it up to the cable box, I noticed a translucent blue green bloch about 3 inches in diameter in the upper left corner of the screen. I tried different sources (dvd) and various settings, but it didn't change anything.Aside from that, I simply could not adjust the picture such that the colors looked as good as my old sony analog tv which I had running beside it for comparison. The difference in resolution was very noticable, however the color on the zenith was inferior (in my opinion) to the sony (especially on skin tones).