Antminer S2 both found dead this morning

[fatso98]

I think my 2 antminer s2's overheated in the night reaching 80 degrees. There seems to be no life in them this morning. Is there a way of resetting them. I can't get onto the IP as the power supplies are not coming on.

Cheers

[1714691626]

1714691626

[1714691626]

1714691626

[MelodyRowell]

I believe antminer warranty is 3 month. So be quick..

[fatso98]

I believe antminer warranty is 3 month. So be quick..

Cheers I managed to sort it by pulling the jumper from the atx power lead powering it switching it off re fitting the jumper & all started fine.

What are the implications of unchecking the check box on the 80 degree cut out.

Has anyone done that?

Cheers

[krfighter]

It did not overheat. The power supply just could not handle the load and shut itself off.
It is a standard problem with the stock supplies: they run at the very very limit of their capacity.
You have three options to avoid this in the future:
1. Run in a cooler room
2. Slightly reduce the frequency, say from 196 to 190.
3. Upgrade to a more powerful PSU, say 1200W

Good luck!

[fatso98]

Oh OK, cheers.

How would you reduce the freq to 190 & would this slow the machine down much?

Cheers

[krfighter]

take a look at this post: https://bitcointalk.org/index.php?topic=629997.0

It is a linear dependence on frequency, so if you lower from 196 to 190 you should at about 970 GH/s nominal

[fatso98]

take a look at this post: https://bitcointalk.org/index.php?topic=629997.0

It is a linear dependence on frequency, so if you lower from 196 to 190 you should at about 970 GH/s nominal

Brilliant thanks, I have just underclocked it to 193 for a start & will probably buy a new PSU...

Cheers for your help

[fatso98]

After a day of running these with all the lowest pre set freq of 193 un #'d I seem to be having approximately 50% worth of duplicate blocks.

Can someone advise me what the following should be I currently have them set as follows?

Option 'freq_value'          '4f02'  #193M
Option 'chip_freq'            '193'
Option 'timeout'               '85'

Really appreciate anyone's help

Thanx

[krfighter]

The timeout is too high. Change it back to 40 and it should be back to normal

[fatso98]

Thank you that's awesome.

Cheers