hi, dsl to contradict but in reality on the T9 + the hashboards are as follows:

Chain 1 = 2 - 9 -10
Chain 2 = 3 - 11 -12
Chain 3 = 4 - 13 - 14

As you tried to change the white cable of the hashboard, and the problem is to move, I believe that the problem comes from the cable ... try to clean it well

Finally, do not install firmware as suggested, I offer it FREE !!! simple advice, why pay: D?

as very well explained above, you must run a firmware before 2019, if this is not the case, you must downgrade by SDcard.

Here is the procedure if its tells you:

1: Install the latest original firmware before 2019, here it is:
https://easyupload.io/p44ue6

2: install my mod (by update firmware on web gui) to unlock the functions, here it is:
https://easyupload.io/u6utr5


Enjoy! start with 650mhz and 830mv, you will have a better hashrate AND a clear drop in consumption;) and heat! (ps: 650mhz is stock frequency for this chips, same at S9)

OP, while it's me who suggested the other firmware, I can vouch for thierry4wd's firmware, he is an established member and a talented developer, you should certainly try his firmware since it's free of charge.

thierry4wd, sorry I usually forget to suggest your firmware.

You can download it here > https://www.awesomeminer.com/antminerfirmware , if your miner runs the latest firmware or any firmware from Dec 2019 onward you might need to flash it using a Sdcard loaded with the recovery files found on Bitmain's official website, if you face any issues let me know.

This is pretty strange, all your 9 chains seem to find 18 Asics and they should work perfectly


You have an issue with chains 2,9 and 10, the strange thing is that they are on different hash boards, you might be able to revive these chains with custom firmware using different voltage/frequency settings.

Have you tried to check the hashboard one by one?

Try it first to find what hashboard is running low hashrate follow the guide from this https://support.bitmain.com/hc/en-us/articles/226142788-Test-hash-board-one-by-one

or if it shows normal then I think you will need modified firmware or use the patched firmware from here https://bitcointalk.org/index.php?topic=5127323.0
To modify the frequency.