That's like putting your miner on a ventilator, it will be a matter of time before they fail again, in fact, you could do the opposite and you would still have a good sucesss rate based on my own personal experience, put the bad hash boards in the freezer (in a sealed plastic bag of course) and many of them will run fine for a few days, I hope I will turn out to be wrong in your case, but those 17 series are TRASH.
What NotFuzzyWarm explained seems to make sense, I am not an electronic expert but I can tell you what causes 99% of the issues for those trash miners, it's the solder that keeps the chips attached to the PCB, greedy bitmain seems to have accepted the lowest bidder and made zero efforts in testing the quality of that medium-heat solder, some people also claim that the robots that did the job were also bad, but what we know for sure, the solder causes the problem in many different ways.
You will find solder balls shorting the chips, chips that lost some part of that solder underneath them so some legs are not in contact anymore, and all sorts of other things that bad solder/soldering leads to, so I am guessing that another reason in addition to what NFW mentioned is the fact the putting those hash boards in oven might have melted a solder ball that was shorting the chip and it fell off somewhere where it isn't causing an issue anymore, which is great news assuming that no other solder balls appear somewhere else.
But what you doing is great, try to fix those trash miners at the cheapest cost possible because they are not worth it.
I am very aware that 17-serie is trash compared to 19-serie. After 1 year of constantly failed 17-serie miners. Thanks for the tip, will try to freeze the hashboard down before starting them up. Lets see my result.
You are right. I am trying in the cheapest ways make those miners alive again.
When I buy and receive a broken 17-serie miner. I do the following steps on each hashboard.
1. Use compressed air to take away all the dust and dirt.
2. Cleaning with alcohol.
3. ultrasonic cleaning with distilled water and 10% Emag EM303 Reinigungkonzentrat Platinen 500ml. Runs 5 minutes on each side with a temperature of 50 degrees.
4. Rinse off the hash tables with distilled water.
5. Soak them in alcohol and blow them dry with compressed air.
6. Put them in the oven at 70 degrees for 20 minutes.
7. flash eeprom with pickit 3.5More than willing to receive more tips on how to cheaply repair/get alive of broken 17-serie hashboards.
Maybe some step I'm doing wrong, like wrong temperature, degrees, liquids...? I am far away from an expert, just taken som tip here and there.
Thanks in advance!
#2 is costly and unnecessary step. A little soap and water should suffice , make it two steps so you can prevent your cleaning solution from becoming muddied.
#5 alcohol is the drying agent, using compressed air is unnecessary and in some cases will return some pretty nasty water onto the board.
#6 there is no problem at bringing the board to full reflow temperature. It is very important though that it is cooled extremely slowly because the delicacy of the heat sink and copper ASIC bond. Don't forget some 951 flux.
This is almost identical to the method I use to get near 100% success rate on S17 rehabs( minus some trade secret details)