Topic: 2 Dead hashblades. One S9 + one R4 (Read 133 times)

Hi, I am having issues with 2 blade from an S9 and 1 from R4 and looking into possibility of either selling them or trying to fix them myself or sending them off to someone potentially.

S9_hashboard_V3.4 History:
The S9 blade failed during an update. I was trying to downgrade to 550M firmware to make the damn thing run a little quieter and to have fan control option. It then booted with only 2 blades . Tried going back to the autotune firmware no luck. Then waited few months for another firmware release hoping it might fix it but still no luck. It shows 0 ASIC in the log

Link to the log : https://83.io/FyYIfPn

R4 hashblade suffered overheating and 2 chips desoldered or died. It have since switched on few times but only when it is only in a very hot environment. Usually it shows it has 0 asic. Sometimes it shows ASICS and the status is like xxooooooooooooooooooooooooooo. so I believe its the 2 first chips. I have not yet removed it from the antminer. How do I work out which 2 chips are the first ones in chain on the board? I was thinking of either trying to reflow them and see how much longer they work for or replace them using 2 chips from the S9 blade...

Do you guys know anyone that fixes this stuff here on the forum? Anyone had similar problems? Anything to check with a multi meter on the hashblades?

The firmware update only updates the control board or both the board and hashblade?

Any ideas and thoughts on this very welcomed.

Thanks