How to fix a welding machine with an OC lamp on - there is no fire or the cause of the OC is on on the electric welding machine. The first step to fix the OC electric welding is to check starting from the 24v power supply voltage, is it normal or not, then check the transformer, mosfet, oscillator etc.
and here's a tutorial/easy way to fix the OC on electric welding with the characteristics of a live fire welding machine not being accompanied by an OC light or a yellow light, an easy and fast way and make sure the power supply is normal 24v by unplugging the cable socket leading to the main transformer and try turning it back on whether it's still oc or not, if the oc light is off, the cause is clear, namely between the main transformer or the diode, but if the socket has been removed/unplugged the oc light is still on, you can make sure that the problem is between the mosfet or the module. To make sure the mosfet is normal or not, it can be measured using a multitester and incidentally in this video the problem is that there is 1 mosfet that is shot which causes the OC light to turn on, while the main transformer, diode, module are still normal.
before replacing a new mosfet, it would be nice to check the gate voltage of each mosfet whether it is normal or not and here the normal is measured at 2.7v (average) and don't forget to also check the working frequency for the mosfet welding machine itself, it is measured at 100khz.
After measuring the gate voltage, everything is normal and flat, just install and replace the mosfet and check the welding handlebar out voltage to make sure it's out.
for the welding machine above, it is measured at 73v DC, just test for welding and thank God the fire is normal and the amperage setting is also normal.
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