Quote from: blastar on November 30, 2017, 07:00:04 AM

First of all, reduce the stock frequency from 537 to say 400 before you burn the 3rd chain!, then check whether the 3rd chain shows cooler temperatures, if yes, install Blissz's firmware to tune the frequency for each chain to balance their temperatures, especially the 3rd chain should be reduced way under the other two. I would advise you to choose the highest fan speed to cool the 3rd chain down, you can also use Blissz's "Performance" mode for the fan.
Don't forget though that this might invalidate your warranty! But it's better having a functioning miner than dealing with hassles of sending it back to Bitmain.
Good luck!

Thanks for the answer!

Of course, I did reduce Frequency, I made a screenshot with stock firmware and stock frequency just to show Bitmain support that something goes wrong.

Now I have following parameters:
Chain#   ASIC#   Frequency   MH/S(RT)   HW   Temp(PCB)   Temp(Chip)   ASIC status
1 60 400 4934.00 0 66 76 oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooo
2 60 400 4914.16 0 63 74 oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooo
3 60 200 2468.87 0 46 75 oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooooooo oooo
Fan#     Fan1   Fan2
Speed (r/min)   1,560   2,700

Voltage is lowest for each chain and 3rd chain operates with half of the power which is annoying.

I just wondering is it some physical malfunction (such as bad heatsink) or just incorrect PIC readings?
Because during my test with Freq=537 even with temperature over 100C it was still zero HW...

I will definitely follow fecell advice and will open it to check everything but I don't want to send anything to Bitmain back.