Is the tasoller using OFW or CFW? If using OFW, LEDs regardless will be off. If you are using CFW, just follow the steps on page 30-31, LEDs will be on but only first 4-5 pads that has different lighting compare to others/
I recently bought the tasoller which by default having the version 2.0 touch firmware and while following the guide (Without using CFW), LEDs doesnt is not on. (Ive also ask about this on page 31). But if using CFW, LEDs does light up with minor defect (there is also other user who also has the same exact result).
Hope that helps