Originally Posted by
andy-w-h
Maybe the situation has changed since you looked.
At least on ebay for the bigger sellers, a bad screen is one classed as having >5 pixel faults and can be returned. Some vendors I notice break the screen down into sectors and specify a bad screen is one with more than 1 dead pixel in the centre of the screen.
However one can purchase a "pixel perfect" model that have zero dead pixels at additional cost which is what I did.
I suspect that supplier rating on ebay is more critical than quibbling with a customer over whether the screen has 5 or 6 faulty pixels. I certainly picked my supplier based on the number and percentage of positive reviews.