Is there such a thing as "If all the IGBTs are good, then all the SMD resistors, capacitors and zeners on the legs of the IGBTs are good" in the inverter welding machines?

That is, as long as at least one of the IGBTs does not explode, will the SMD elements underneath remain intact?

 

Any component can fail, so there is no such guarantee.

 

Any component can fail, so there is no such guarantee.

but what are the odds in this case??

 

The odds would depend greatly on the circuit design, for example how close to component rated values the circuit voltages and currents are in normal use, and on component quality.

 

Is there such a thing as "If all the IGBTs are good, then all the SMD resistors, capacitors and zeners on the legs of the IGBTs are good" in the inverter welding machines?

That is, as long as at least one of the IGBTs does not explode, will the SMD elements underneath remain intact?

This is an example of "aspirational electronics". We want it to be true so badly, that it must be true. Sadly, the world does not work that way in life, love, or electronics.

 

Is there such a thing as "If all the IGBTs are good, then all the SMD resistors, capacitors and zeners on the legs of the IGBTs are good" in the inverter welding machines?

That is, as long as at least one of the IGBTs does not explode, will the SMD elements underneath remain intact?

Only one semiconductor exploded here. If that part is replaced will the power supply work again? The chances are slim to nothing.