Antminer S4 fan issue

[lesh11]

I just bought a used S4, and it ran ok for about 12 hours.  It is hitting 80C and shutting down.

With the top cover off, the front fans dont run at all, with the top cover on the run, but I think it is just because air is being pulled through by the rear fans.

On the S4 I already had, all 4 fans indicate about 3600 rpm.

On the new problematic unit, the rear fans show 4400 rpm, the front fans indicate 1080 and 0.

Do I need new fans?  Is the fan driver the problem?

I appreciate any help the group can provide.

Les

[gt_addict]

I'd say it's worth trying new fans first or maybe swapping front ones to back seeing as you know the back ones work. Swap them over and see if they work on the front. If they do then it's just the fans that are dead

[notlist3d]

I'd say it's worth trying new fans first or maybe swapping front ones to back seeing as you know the back ones work. Swap them over and see if they work on the front. If they do then it's just the fans that are dead

Also before swapping the one showing 0 is it not spinning?  Just checking guessing so but good advice on swapping to see what it does.   A good article I used a while ago when I had S4's was this: https://bitmain.zendesk.com/hc/en-us/articles/204199879-Antminer-S4-fan-specification-and-possible-replacement-fans

It has very good recommendations on fan replacements, and of course you could order from Bitmain or BitmainWarranty.  I did try one of the Sanyo's long ago they do have more RPM.   But guessing most stick with Delta's when replacing.

[lesh11]

Thanks all.  I swapped the fans, and the problem follows the fans, not the connector position on the PCB.
New fans ordered.

[Laviathon]

Thanks all.  I swapped the fans, and the problem follows the fans, not the connector position on the PCB.
New fans ordered.

Thats pretty common with s4's at this point.  The fans are starting to die on all the ones I had.

[notlist3d]

Thanks all.  I swapped the fans, and the problem follows the fans, not the connector position on the PCB.
New fans ordered.

Thats pretty common with s4's at this point.  The fans are starting to die on all the ones I had.

S4's are kinda dated at this point and most likely a lot have had multiple owners.  I know I sold mine long ago and upgraded to S5's at the time.   With them getting older having a extra fan on hand is a good idea.   If multiple S4's maybe even a few, and make sure to clean them they can get very dirty over time.   I like using compressed air personally, and if any dust on fan's wipe them off.  

I owned a few a while back and only had to replace 1 fan.  I used on of the sanyo's from the article they recommend, think I got it from Amazon at the time. But having extra parts is really part of mining to a certain point specifically if older gear.