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I accidentally touched the AWithZ P120D battery’s negative terminal with one welding pen while the other pen made contact with a positive part, causing a short circuit; now the machine won't weld even though the screen is on. What could be the problem, and how can I fix it?

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Based on the behavior you described, it is highly likely that the short circuit caused internal hardware damage, specifically to the MOSFETs (MOS design)…