Antminer S7 yellow fan wire cut?

[j1772upnp]

A used S7 showed up in today's postage. I haven't brought it home to play with it yet, but immediately noticed the front fan's yellow wire is cut.

I read this defaults the fan to run 100%, but I was curious if a cut wire is indicative of mistreatment elsewhere? Would you recommend patching the wire, or just let it be?

[sidehack]

Only if it's wired up wrong would that work. Blue is PWM, which disconnecting that defaults to 100% speed. Yellow should be tach, which if the controller doesn't see a signal on the tach line it won't know there's even a fan attached and it'll probably not want to work. Unless it's been flashed with one-fan firmware.

[j1772upnp]

Thanks. Any danger in wiring it up and seeing what it does? The wire is most definitely a clean cut... Why would someone do that?

[j1772upnp]

Blue and yellow were switched 

It's running fine, so I'm not going to worry about it.