There was apparently no way to disable the Wi-Fi radiation using the remote controller - so what to do? Opening the back of the TV set...and finding the Wi-Fi sender...
– Update may 2015: There is an additional (!) microwave emitter for the 3D function.
This emitter was not disabled in the above video. The 3D emitter only emits microwave once the 3D function is active. The battery driven 3D glasses also emit radiation on startup, after that I could not measure any radiation from the glasses. The radiation level at 2 meters distance from the TV was up to 6µW/m². So the 3D radiation is lower than from the Wi-Fi emitter.
On the warranty: My local TV seller told me the warranty would be gone if I opened the TV myself. This might not be the case with all sellers. You will have to ask the seller.
