I have a Zenith 27 inch model SR2552S TV. The chassis number is 9-1558. There are horizontal white lines at the top of the screen. I looks like part of the top of the picture is rolling back downward. The size of the area starts off at about 3 inches, then as the TV warms up, shrinks to about 1 inch. Is there a connection that is bad on this chassis, or maybe a resistor changing value with heat? Thanx for the help. Help make your TechAssist online repair tips database better! Submit your fixes here: http://www.circuitwork.com/techassist/tip/#tips To unsubscribe write to: techassist-request@xxxxxxxxxxxxx with unsubscribe in the subject line.