Algo de actualidad sobre el tema. Aunque nada alentador:

En Avforum están que trinan con el problema de las manchas verdes:

The patterns seems to match quite exactly with the internal support structure of the tv, which again implies that the panel has somehow been shock damaged somewhere between the production line and the distribution. If these speculations are correct, there is no way this is going to be solvable with a firmware update thus it SHOULD warrant a panel replacement for every affected buyer. But once again, this is PURE speculation, though it seems a little plausible to me. I will make a call to the service centre that is dealing with my case tomorrow to ask if they think there might be something to this theory.

Para los que me habéis preguntado por privado si con una calibración se podría mitigar el problema de las manchas verdes: Aquí tenéis la respuesta y opinión de un calibrador ISF:

I talked to an ISF calibrator, and he said that if the screen-uniformity wasn't there and some parts of the picture were greener, it wouldn't be possible to do a proper calibration at all. So this is clearly not within specs even if Panasonic claims so. The VT30 was designed to be ISF calibrated if one wanted to, and if such calibration cannot be done due to defects it can't possibly be within spec under any circumstances.
A parte de afectar a mucha más gente de lo que se pensaba, parece que no se ha solucionado en nuevas remesas, ya que las nuevas también tienen el problema.

Reports from other users makes it sound like they are treating this as a real issue, though. One user saying that they are investigating the production line and that they've had a lot more people affected than they initially thought. Also, I *have* seen sets free from this fault, so they can apparently make them 100% every now and then
Green Tinge Fault - Panasonic (VT30, GT30 and ST30) | AVForums.com - UK Online - Page 11

Nada de calibración pensando que con ello se van a mitigar las manchas...y nada de que nos vendan una nueva remesa, ya que las nuevas también tienen manchas.

La mejor y única solución, es o no comprar o buscar una unidad en las mejores condiciones posibles.

SALUDOS