***working with Sony for a replacement***
I purchased my 60R550a (serial number 6xxxxx) back in June ‘13 and immediately noticed a "blob" measuring roughly 17" by 8" located in the middle of my screen. Tends to be more noticeable on white and light colored backgrounds. Knowing the TV came with a one-year warranty, I didn't experience a sense of urgency to call and get this resolved. Perhaps the hesitation came from the anticipation of having to call and deal with customer service and not knowing how well they would take care of me. I called Sony customer service and described the issue as a slight discoloration permanently fixed in a certain area of the screen.
After stepping through some meaningful troubleshooting (i.e., removing the plug from a surge protector and plugging it directly into the wall…because THAT’S what would cause something like this :-^) they offered to send me a recertified TV “comparable to the same model” and a two year warranty. I accepted.
Within a week, the replacement came via CEVA and ‘white glove’ service. They installed the replacement TV, packed up the old TV, then waited for me to inspect the replacement TV. Unfortunately, the replacement TV had the same issue…but five times over! It looked like there was a turkey on my TV. There were five “blobs” the same size as my original “blob” but in turkey tail formation. I could not accept that. They unpacked my original TV and repacked the replacement and I signed the “refusal of delivery” notice.
Sony called not more than an hour later to confirm the situation. They are sending another replacement TV within the next week. We’ll try this again. I’m not sure how many times we’ll need to go through this before they try a different strategy but I’m willing to repeat the process until I receive an acceptable replacement.
That’s the story and current status of my TV containing a ‘blob’.
Are you 100% certain there' no electromagnetic interference going on there? I can tell you my old DLP just would not work in one certain corner of my den without glaring audio interference. I never figured out exactly WHAT it was but as soon as I 'moved the TV to the other side of the room it worked fine. For two TVs to exhibit the same weird issue strikes me as environmental.
The blobs are not so weird that it would make anyone think that.
There is no electromagnetic interference that can cause this....these aren't like CRTs. And the Audio problem you're talking about is a completely different beast.