Samsung TV models for Brazil traditionally tend to be a little different (hardware/firmware). I bet Brazilian D7000's have their own firmware version, at least.
However, South Korean & US models look pretty much identical on that level ( and - unless I'm very much mistaken - Korean models have PVR/timeshift enabled).
There are quite notable differences between European (T-GAPDEUC) and North American/Korean (T-GAPAKUC) firmware branches; exeDSP in EU firmwares is nearly 50% longer..
But, PVR-related code is definitely incorporated in T-GAPAKUC firmware, too. So, it looks like PVR enabling for US models is only a matter of proper settings. Keep trying

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