Just had a legal student up whop has an IBM laptop away for a replacement screen for 1 dead pixel. The laptop is 4 weeks old and IBM said the usual see ISO blah on number of pixels required to be faulty for it to be classed as faulty. She then quoted some sections to them from the Sale of Goods act paying special attention to MINOR DEFECTS. IBM are now replacing the screen as when they hummed and hawed about it she said she would take them through small claims court and that she would win. Obviousdly she would have as IBM are replaceing the panel.
So if you get a tft with a dead pixel and not enough as stated in the ISO you should be able to get it replaced as it is a Minor Defect.