Focus: The warranty period for control boards with brand is a hundred and fifty days (calculated within the date of shipment), and those without the need of logo are not coated with the guarantee. A：Hello there, thanks in your message. Remember to get in touch with our sales manager via https://rowanzgnxd.bloggosite.com/44844873/the-best-side-of-antminer-s9-control-board-schematics