I don't know the welder but a friend has a small MIG with 2 switches to
control 4 power levels and it appeared to stop working. After we spent
several hours checking the internals I realised that the power switches
effectively had a centre off, whether intentional in the design or not,
one had got knocked to the centre position and that did it. Put it back
to an appropriate setting and all was OK.

Willy Eckerslyke wrote:

Slightly off topic, but you guys are more likely to know the answer
than anyone else...
My SIP Topmig Turbo 150 has just stopped working. Initially, I thought
a thermal cutout was operating as after using it on high power for a
while, the wire feed and arc stopped working, though the fan kept
running. After an hour or so's rest it would be OK. It did this for a
couple of days, but now doesn't want to play at all.
I've checked with a multimeter and the trigger is operating properly.
The machine has power as the cooling fan still runs and the light
comes on.
Anyone had a similar problem?
All the electronic wizardry looks to be on a small PCB behind the wire
speed dial which looks easy to swap over, so unless a replacement is
silly money, I'm inclined to try that before paying for someone's time.
So anyone know where I could get one?
Or know of SIP's home page?
Google wasn't being very helpful here.
Thanks.