One board on S9 (two month old) does not work anymore. It is still under warranty, but is it even worth it sending it to hong kong?
What is the cost to do that from US, approximately? Instructions are peculiar and I have no ability to photograph anything as the miner is in hosting. What did you guys use, UPS or FEDEX?
I would use UPS.
You 'can' open a ticket on bitmainwarranty.com. Just say "no warranty". Their techs may be able to fix. They are pretty good/attentive.
Had them fix one of my s9 boards without Denver warranty, $175. Only one week turnaround/downtime.