serial#432280475 model #ps52682 and #p2k171acb my husband bought the big screen for $100 around 21/2 years ago from a coworker the reason he sold it was because he saw a line in the picture. The problem we have is sound starts screeching and picture turns to snow.So we turn it off and turn on it's fine till it happens again. Now we just haveit off we would like to know if it's even worth fixing if we can buy a fuse or something for it can you give us items as to were to look. Thank you