S9 hashboard mining at lower hashrate

[pupok]

hello i have this problem with one of my miners, i sent it to repair like 5 times in less than 8 months, i just receive it back and im out warranty now, and one of the hashboard is minig at lower hashrate (600gh/s) and the red light turn on so the hashboard is tuning on but not hashing at the right phase here is a screenshot of my GUI
http://imgur.com/a/HsUzH