Hmm… someone brought me this Miller Diversion 165 TIG welder for repair. Claim is it doesn’t arc. Well it tries doing something if I put the tungsten tip straight to the aluminum plate. All I hear is a little tick… tick… tick…, I have the power LED on, but the other (blue?) LED doesn’t light up. I think it is supposed to when there is an actual arc.
So I opened it up, found a bad looking connector between the main board and the small HF board. Checked the SCR and few other things on it and found nothing. Then tried again. Same thing. I will not for its own life strike an arc.
Took out the board with the big IGBT’s and diodes. 500.000 screws later. Nothing. No shorted diode or IGBT.
I am 100% sure the problem is not on the primary side on the main board The only thing left is that secondary side on the main board (with the 4 large capacitors on it). A new board is $2k.
Oh… ya… before I forget it: Miller does not give out any service manuals or schematics. All the do is change boards. Great price Miller!
BTW. There is no burnt smell, machine is relatively clean and nothing visual that sticks out like a burnt something or other.
I wonder if someone had the same problem before?
So I opened it up, found a bad looking connector between the main board and the small HF board. Checked the SCR and few other things on it and found nothing. Then tried again. Same thing. I will not for its own life strike an arc.
Took out the board with the big IGBT’s and diodes. 500.000 screws later. Nothing. No shorted diode or IGBT.
I am 100% sure the problem is not on the primary side on the main board The only thing left is that secondary side on the main board (with the 4 large capacitors on it). A new board is $2k.
Oh… ya… before I forget it: Miller does not give out any service manuals or schematics. All the do is change boards. Great price Miller!

BTW. There is no burnt smell, machine is relatively clean and nothing visual that sticks out like a burnt something or other.
I wonder if someone had the same problem before?

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