I've owned my HT30744 for 2 years to the day as of Tuesday the 26th. The screen had started greening a good while ago however we pretty much grew adjusted to it. It wasn't until I received an Xbox 360 for Chistmas and hooked it up via component cables that green coloring become less of a nuisance and more of an outright impairment.
Having found this thread, the first thing I tried was tilting the TV on it's right side. Lo and behold the fixed the problem, not just temporarily but for the entire length of time the television was on from the point of the tilting. One tilt a day kept the green away until the TV was turned off again. Even with this new cure for the green, I had read many a post that mentioned that the problem was progressive and I decided to bite the bullet and call Sanyo, knowing full well what might happen thanks to many other user's accounts. Dave at Sanyo customer service proved incredibly helpful, and told me to take it back to any Wal-Mart and get the replacement HT30746 model, despite the fact that I was an entire year out of warranty and had no receipt.
Figuring that I'd rather take the new model and not push for a repair since I was so far out of warranty, I called the local Wal-Marts until I found one that had the unit in stock. This proved to be a trying enough event that it almost completely negated the positive experience I had with Sanyo. Regardless, we found a unit at a Wal-Mart a mere 6 miles away so I made arrangements to help move the behemoth of a television.
The Wal-Mart exchange process wasn't smooth by any means, but having been prepared to go in swinging, I was pleasantly surprised. The customer service employee was extremely patient and had no qualms with my story. I explained the situation and gave him the phone number for Sanyo which Dave had instructed me to do. They were able to get Dave on the phone after a brief wait and he was able to walk the CS employee through the transaction.
When all was said and done, the entire service desk experience probably took close to an hour as CS was usually waiting on hold for Sanyo, the electronics department, or a manager for the majority of the time.
As for the HT30746 itself, I can't say I'm entirely pleased with it. It's a little lighter than the HT30744, but it's still a monster. The new beveled speakers on the front are a little sleeker looking as well. The image quality however is a mixed bag. With the Xbox 360 over component, the image quality is on par with the HT30746, and the interference I had experienced previously is noticeably absent on the new model. The HD experience is definitely an improvement.
Digital cable over coax however is another story. The SD picture is just awful. Everything looks incredibly grainy, and small text is damn near impossible to read. The default picture settings for the TV are also terrible. Everything looks incredibly washed out and bright. I've done some tweaking, but if anyone has AVIA or DVE settings for the HT30746, I'd greatly appreciate them.
After all is said and done, I honestly wish I would have pushed for repairs to my HT30744, but being so far out of warranty, I didn't want to risk it. If any HT30744 users have the option of a Sanyo repair, or a cheap out of pocket, I'd highly suggest taking it versus trading in for the HT30746.