I haven't read through this thread so forgive my ignorance, but are these blobs generally obvious or more visible with certain content? What's a good way to check for them?
I have an April 2012 build VT50, so it's presumably from a very early run of the sets, I do get some mild buzzing but would like to identify any issues sooner rather than later so I can replace with another plasma. I'm still covered by Geek Squad for the next three years or so.
ht Panasonic TC-P60ZT60, Monitor Audio: Silver RX6, RX Centre, Radius 90HD; Martinlogan Dynamo 700, Marantz SR5006, PS3, Oppo BDP-103D
2ch Marantz PM8004, Sony BDP-S1000ES, JVC T-X3 tuner, Monitor Audio Silver RX1, REL T3, Apple TV, Peachtree Audio DAC•iT
lr Panasonic 50ST60, Sony BDP-S5100