@bogart - do you have any close ups of the areas you advised checking for 'opens' around the VRMs??
That must have been another user...
Bogart
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Re: Swedish ASIC miner company kncminer.com
14 November 2013, 10:51:13
Reply with quote #21655
Quote from: soy on 14 November 2013, 09:46:43
maybe it got so hot as to melt solder and create an open.
That's would be what I would look for.
Use a flashlight and a magnifier and check the big power-carrying solder joints for hairline "cracks". You can try push/pulling on the VRM too and looking for movement of the pin in the solder pool.
I used to see this all the time in old TVs and monitors and such.
Oh...yeah I guess I hadn't really looked at it when I said that. I was picturing through-hole components, which these are not.
I guess you can't really see the solder joints on these so that wouldn't work. Sorry.