Jeremy S Posted January 29, 2017 Share Posted January 29, 2017 I was given the power supply/amp from a RW12D to repair. The main symptom was that it was instantly blowing the fuse. Some testing revealed that one of the MOSFETs was shorted, Q401. Has anyone successfully replaced a shorted MOSFET in one of these power supplies and got it working? I'd hate to invest time and money into this supply only to find other underlying problems. When I desoldered the old MOSFETS a few of the leads had some kind of spacer around the leads where they solder to the PCB. Was this part of some internal trace to the board? If this spacer came out on the old leads, am I screwed on soldering a replacement part in? Thanks in advance for any help! Jeremy Quote Link to comment Share on other sites More sharing options...
wvu80 Posted January 31, 2017 Share Posted January 31, 2017 I'm replying to bump this to the top where maybe someone can see it and be of some help. My answer is I don't know. Good luck. Quote Link to comment Share on other sites More sharing options...
MikeFord Posted February 1, 2017 Share Posted February 1, 2017 Depends on the goal, a working amp, likely no, an education on how amps work and fail, maybe. I'll make a wild guess the mosfet was the "fuse" for some other failure point. Picts might help with regards to the spacer. Quote Link to comment Share on other sites More sharing options...
efzauner Posted February 2, 2017 Share Posted February 2, 2017 Mosfets are cheap Can you read off the mosfet part number? you may not need a direct replacement. Main specs are the Voltage and current. Try to replace it. worst thing that happens is you blow the Q again. Check the Another RSW15 bites the dust thread for repair center. $160 in the US I think My RS15W also has a blown amp. I am using an external amp now. .Got the sub for Canadian $200 cheap So I am happy.. I will attempt a repair sometime. Quote Link to comment Share on other sites More sharing options...
Jeremy S Posted February 11, 2017 Author Share Posted February 11, 2017 Even with the MOSFETs removed I was still getting a short across the power supply. I also found another burned component, the MOV. I sent it back to the owner un-repaired and they are ordering a replacement. I just didn't feel like tearing the whole damn thing apart to find the problem. I suspect that this unit took a nasty surge. Quote Link to comment Share on other sites More sharing options...
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