Serial number 4A1A0426606281
When first turned on our tv has 3 colored lines( blue, red, and green) about 1/3 of the way down the picture. It also has 3 to 4 inches of white horizontal lines at the top. The colored lines disappear after a few minutes but the white horizontal lines remain. Any suggestions on how to fix this? Philips was no help in this matter. Thanks.