Are you kidding me, that is PISS POOR customer service/care. Have you tried looking around on the net to try to find schematics and troubleshooting? Kind of surprised someone hasn't chimed in with something.

 

I found a little info on an Eastwood mig 175, but no 170.https://www.eastwood.com/images/pdf/12012Q_MIG175.pdf

Here is another thread here on the web that may help too. https://weldingweb.com/showthread.php?221581-Review-of-Eastwood-MIG-175 You will need to read the thread to gather the useful information that I'm referring too.

 

Looks to me like a re-branded Lincoln Mig Pak and the issue sounds a lot like the issue I have with a Mig Pak 15 (175 amp). Stopped mid weld, no arc, no wire feed and no fan. There is an old thread on this forum:
https://weldingweb.com/showthread.php?453191-Mig-Pak-15-No-Power-No-wire-feed
If your problem is a blown fan motor and it is like the lincoln one good luck. The part is discontinued. I don't know how they can do this as several of their welders us this fan configuration. After hunting the net for 2 days and speaking to many lincoln service people I found the part right in the city I live in, old stock. They wanted $200 for it (Canadian). I figured screw it and bought a new welder. I wondered if the welder was jinxed as I bought it from a young woman whose husband had died without even trying it. I probably only ran about 10 lbs through it. I imagine there is a way to wire in a step down transformer and separate fan into it as one of the posters mentioned but I was done with messing with it

 

Sorry, I meant Mig 175. Too much research the past few days. It's actually, from what I can tell, the same thing as a LOTOS 175. Seems like they keep a tight wrap on things. The only thing I found that came close to assisting me was a guy on YouTube going through the board, however, that was also in Spanish. For grins, I wired mains directly to the transformed, and I was able to get an arc, so that tells me the transformer / rectifier / capacitor are hopefully good. There do appear to be two SCRs on the board, not sure how prone they are to failing, for got about $5 each, I may give it a try.

 

For the heck of it, here's two pictures of the board in question.

 

So, I removed the SCR's (attached to the heat sinks) and they both tested bad. I'm investing the $15 to replace them with quality versions. Will update once they show up.

 

This will probably be my last update on this. After speaking to another CSR, I WAS able to purchase another controller board for his unit. $52.00 shipped. I just had to sign a waiver stating that there are high voltages involved, and if I did anything stupid, they are not responsible.