I have just paid 140 pounds to have a my toshiba 36zp46p fix...

I have just paid 140 pounds to have a my toshiba 36zp46p fixed.
They have wrote on a piece of paper stuck on the back of the set.DIGI PANEL.
They are saying they have put in a new one.They had my t.v.for several days.
The problem is still there.The picture is not clear, there are lines from corner to corner in the back ground of the programme you are watching.This is more prevalent from switching on the set.Calming down as the set warmed up. This was my problem initially, progressively getting worse as the days past.Hence I had it fixed. I really like the picture quality of this set