Since you only have the 3 - 3.5mm audio jacks for input, the only way to get true 5.1 would be from a reciever that has those as an output (most are only input).
As for your tv, even if your X-530's accepted optical out, you would still need something to decode the signal which most speaker systems don't have the capability of doing.
The only way I can think of to get anything more than 2.1 would be with a 3.5mm splitter. That would only mirror the front stereo signal to the rear speakers. That is not something I would recommend as I am sure it would sound basically like crap and would not offer any sort of real surround sound.