BGAmodz
Member
So i got recently a MMA portable welder , the problem with it is that the system shutsdown after a short time of usage .
I opened it and checked if something is wrong with it , and everything seems to work fine , Fan , bridge rectifiers , actually the unit turns on normally and also soldering intensity can be varied .
Next i checked the MOSFETs there is 12 MOSFETs 6 facing 6 , one of them was hard to move from the radiator's aluminium and also from the fixation screws's metal plate , an other one i noticed that the writing on it turned from white to yellow .
Could those particular MOSFETs be heating up so fast because they are getting bad or just due to some lake of heat dissipation ????
I opened it and checked if something is wrong with it , and everything seems to work fine , Fan , bridge rectifiers , actually the unit turns on normally and also soldering intensity can be varied .
Next i checked the MOSFETs there is 12 MOSFETs 6 facing 6 , one of them was hard to move from the radiator's aluminium and also from the fixation screws's metal plate , an other one i noticed that the writing on it turned from white to yellow .
Could those particular MOSFETs be heating up so fast because they are getting bad or just due to some lake of heat dissipation ????
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