Having issues with one of my upgrades. All of the other 6 units are hashing without issue, but one unit refuses to mine. I'm getting 100% discarded. I'm not sure what's going on with this unit.

I've tried the following:
1. Updated to latest S3 firmware, not saving config
2. Configured unit from scratch (same problem)
3. Backed up and restored a working config from another unit (same problem)
4. Rebooted numerous times
5. Powered off/on unit numerous times

I'm running out of ideas on what could be the issue. Any ideas of suggestions from the community on what could be causing this issue?

Got all 6 of these upgrades in over the weekend. I have 3 of the kits installed all using the original S1 firmware on the controller card. I had to change the asic-freq values to make it work without the S3 firmware update, but these units are consistently hashing @ 500 GH/s. The drawback is that the ASIC listing on the Miner Status page in the GUI still expect 32 chips when there are only 16 values, but past that they work just fine.

I'm using the following settings in /etc/config/asic-freq

option 'freq-value'  '0982'  #250M
option 'chip-freq'    '250'
option 'timeout'      '16'

I was able to make the upgrades for each unit in about 1 hour. I did purchase thermal paste from a local source, then used an old credit card to scrape the old thermal paste off the S1 blades as I removed them. I then incorporated new thermal paste into the old and mixed it with a cotton swab. I used the mixture on each of the ASICs on the new S3 boards and they are all consistently running @ 39-42 C. Once I have the others done I'll post what stats they are running with before and after the S3 firmware updates.

I have amended my auctions already stating I must have proof of identity and a host of other qualifiers before I would give instant voucher codes, and any questionable activity or users with no feedback in the last week will have to wait for post. CEX did provide the IP and email address of the perps this morning which has helped me immensely in being able to pursue legal action. So I'm square with CEX at this point.

I've already been around the mountain twice with PayPal and eBay is refunding the transaction costs. PayPal refuses to accept the method of shipment as proof of shipment to the customer. There's really nothing left to do at this point other than report this and begin the process of digging to find the person(s) responsible and pursue legal action once identified.

"This is just like if you buy stolen merchandise. When the police come to your door to recover it, they aren't going to offer to reimburse you for it; you're out. It was a risk you took, not someone else. Nobody else can be held responsible."

That's exactly correct, the police won't reimburse me but a court would make the perpetrator pay restitution, and if the stolen merchandise is $ then the depositing bank refunds the stolen funds. Unfortunately we're not dealing with real life here, we're dealing with coin and an exchange...which is still too new for any real control factors to have set in.

I get it, and take full responsibility for my actions, I took a risk and got burned. But I don't have to like what happened, nor do I feel I should be quiet about what happened. I want this thread to be here for others to see so they don't make the same mistake. I can afford the hiccup fortunately, but for others that aren't as fortunate financially to be able to absorb this type of problem I want them to know not to do this, nor should they expect CEX to help them in finding the people that defrauded them. That's what really incenses me about the whole thing...the lack of even so much as empathy on the part of CEX.

I see the error in my ways at this point, but it's after the fact. As stated previously the vouchers weren't sent by email, they were sent by eBay message where you contact the buyer about the item, it never touched an email server. I could understand the stance the item wasn't delivered if it was by email, but by contact in eBay is another story. This process is exactly how I got involved with CEX, I purchased a legitimate voucher code on eBay and got started mining, then was able to grow my GH/s through mining, and then purchasing additional equipment to mine from home. This isn't a BAD IDEA, this is a way to get more people involved who don't know how to get into mining.

As it stands now, the buyer didn't reverse the funds, the eBay account has hijacked, which is why PayPal froze the funds. I'm the one that took the risk, but it's disturbing to know that CEX refuses to cooperate in identifying the perpetrators of the fraud. They were willing to identify the user accounts, I have both of their usernames, but I have no recourse, and CEX while admitting the purchases were fraudulent refuse to do anything about it. It's like someone stealing money out of your bank account and the depositing bank refusing to release the deposit of the fraudulent funds.

I've posted this thread to be sure that others are more aware of the ways other can and will defraud you. I had expected more cooperation from CEX when they openly admitted it was fraudulent. Live and learn...

Additionally: "But I swear I sent them something via eBay message." is something that eBay can prove. it wasn't sent via email...it was in the contact service provided by eBay. How would I know that the "verified" eBay member was fraudulent?

Additional information can be found on this thread https://cryptocointalk.com/topic/11286-cexio-voucher-fraud-and-cexio-refusal-to-assist-in-recovery-of-stolen-ghs/ which details the scam and the CEX.IO position on the whole thing.

After providing proof of fraud CEX.IO are refusing to do anything other than give me the username that did indeed cash the voucher. This company claims to be a legitimate exchange and financial institution but holds no accountability when presented with proof of fraud. To turn a blind eye to fraud is to be a party to fraud!

I requested the issue be escalated to a manager or director and was told point blank the case would be closed and no additional responses would be made to my request. How's that for customer service?!? These people only want your coin and to rip you off! I'm trying to get more people involved in hashing by providing an easy alternative to buying BTC and transferring it to cex. Yes I expect to see a profit from this endeavor but didn't expect the provider to leave me with my ass hanging in the breeze!

Needless to say I'm extremely unhappy with the way I've been treated and will be taking this issue to the masses starting right here!

Here's the thread on CEX.IO: https://support.cex.io/hc/en-us/articles/201572336-Feb-27-2014-Vouchers-usage-warning By admitting that the vouchers were in fact legitimate and that they were purchaed fraudulently and doing nothing about it makes CEX.IO a knowing participant to fraud! I'm highly reconsidering whether to keep my GH/s on CEX or cashing it out and never doing business with this group again.

Who else here has seen this issue?

Thanks for the update. Hope this won't keep you from continuing the exchange.

I've replaced one of my antminers with 0603 10K OHM and 4.99K OHM SMD resistors. I have been able to overclock it successfully to 2.5GHz, but it doesn't go past that without giving a lot of hardware errors. I'm reasonably sure this is an issue with cooling on the ASIC. I will attempt to work out a way to diffuse heat better and see if this yields better results.

Has anyone else tried this?