I applied the fix earlier today to my Samsung D550 and can confirm that the brightness pops are now gone. However, the display immediately developed areas of red snow, largely at the top of screen but also sporadically throughout the image. This appears to be affected somewhat by the colours on the screen. I have tried various settings but nothing helps.
Any suggestions anyone? The TV is only 3 months old and will still be covered by warranty. The retailer has their own repair service, so may just need to bite the bullet and have this looked at.
I should also add that I am in the UK so firmware for the TV has been sorely lacking.