r4 antminer 7.5Th hardware fails issues

[Karateminer]

Hello there miners, my first impressions about the antminer r4 7.5TH are not all positive, although the machine is silent, I think it has a design flaw in its hardware, a lot of 14 machines 4 of them have thrown flaws in the processing cards. These errors occur with just a reboot of the system, or a change in the Miner configuration (eg change from antpool to slushpool)even in a simple on and off. I suspect that Bitmain must have received many reports associated with this failure. In summary the machine is unstable, In my case 4 machines have turned off several processors in both boards, And in one of the 4, it only recognizes one board. I tried with a soft reset, then hard reset, firmware upgrade and in all cases I did not have good results. If anyone has had this experience I appreciate your comments. In advance I have no other option than sending the parts to validate the warranty.

[1715497014]

1715497014

[1715497014]

1715497014

[1715497014]

1715497014

[HagssFIN]

Yeah, warranty service it is with the faulty boards.  

I would like if Bitmain would be little more open on the repairs they do for the miners, if it is something that advanced users could with right tools do themselves.

[Karateminer]

Thanks for your comment, there is actually no other option than the change of boards which translates into loss of time and money. In my case I see that the percentage of machines that failed is very high 4 out of 14. And the cause must be because the machine is not robust, it probably has not been tested enough before its release

[jamesb777]

50% fail rate here from 4 of the 7.5th machines.. 3 previous batch machines still running without issue.