Antminer S4 reporting 3 rows of x's after 4 months of use. Need new PSU?

[tatored23]

Hi guys,

I have an antminer s4 that was working great, but went from 2th/s down to under 5gh/s. Looking at the miner status, I've got 3 boards reporting all x. This actually occurred a few months ago during the summer, and it's possible the miner got hot during the day (had an AC set at 70, but it may not have been able to maintain that during the afternoon). I've tried updating the firmware, hard resetting, and trying different pools, same results.

https://i.imgur.com/WLLK2OS.png

After looking around, this may possibly be a PSU problem, but I would love to confirm before I drop $140 on the Bitmain Replacement PSU.

Thanks for any input!

[e46btc]

Try to setup the lowest possible freq in advanced settings just to check if chips will report good state.
It can be power supply issue for sure, PSU in S4 is not really good even replacement revision.