Coppell TV Repair offers you one new, unused transistor W9NK70Z used in various power and plasma TV sustain boards.
We are a TV service center and use the parts we list. In fact all the parts that we sell come from the very same pool that our own technicians use when performing service.
We do not usually test individual components before sending them out.
Instead, we do the usual random sample testing whenever a new batch arrives and then keep all the parts from the batch in one place. We also try to never sell parts from the batch before we ourselves have used at least two components from that batch.
This is as much as we can do and if it is not sufficient for you please do not buy from us!