I have a Lincoln Electric LE31MP that blew up, and I'm trying to repair it. The low power supply UC3842/MOSFET/resistor blown-shorted. Replaced all these, and relay turns on and fans work, but still nothing else works. IGBTs/diodes are OK. There is also a UC3843 and MOSFET next to the low power supply. That MOSFET seems OK. Any recommendation, what to check?
I have a Lincoln Electric LE31MP that blew up, and I'm trying to repair it. The low power supply UC3842/MOSFET/resistor blown-shorted. Replaced all these, and relay turns on and fans work, but still nothing else works. IGBTs/diodes are OK. There is also a UC3843 and MOSFET next to the low power supply. That MOSFET seems OK. Any recommendation, what to check?
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