Anyone repair inverters?
I know a few of you all work with this kind of stuff: I got a Xantrex 1750 Plus inverter that goes to FAULT whenever I put any load on it. It was in fault when it was given to me so I pulled the MOSFETS out and sure enough one of them was bad so I replaced it with a spare I had and I got it fired up to clear the fault. As soon as I plug something into it (from a heat gun to a 30W soldering iron) it trips to fault. When I was in there and probing the AC out, I must have touched something as I heard a crack like a .22 went off. It went to fault again and I blew another MOSFET but I had a 2nd spare so I put it back in an now it wont take any load, just goes right to FAULT when something is plugged in, but I do have 107V AC off the plugs (?). It clears if I power cycle it. I looked at the PCB for a blown capacitor but there is nothing burned on the board, no bulging caps, no arc track or any sign of a spark. Dont know what it was but scared the fool out of me. I replaced 2 of the 8 MOSFETS on the bottom right, did not check any of the others but other are 2 leg and some are 3 leg. None have any burn marks on them. Any idea where to start looking? As I said, nothing looks damaged on the board. My $12 LCD component tester really made checking stuff easy!
I know a few of you all work with this kind of stuff: I got a Xantrex 1750 Plus inverter that goes to FAULT whenever I put any load on it. It was in fault when it was given to me so I pulled the MOSFETS out and sure enough one of them was bad so I replaced it with a spare I had and I got it fired up to clear the fault. As soon as I plug something into it (from a heat gun to a 30W soldering iron) it trips to fault. When I was in there and probing the AC out, I must have touched something as I heard a crack like a .22 went off. It went to fault again and I blew another MOSFET but I had a 2nd spare so I put it back in an now it wont take any load, just goes right to FAULT when something is plugged in, but I do have 107V AC off the plugs (?). It clears if I power cycle it. I looked at the PCB for a blown capacitor but there is nothing burned on the board, no bulging caps, no arc track or any sign of a spark. Dont know what it was but scared the fool out of me. I replaced 2 of the 8 MOSFETS on the bottom right, did not check any of the others but other are 2 leg and some are 3 leg. None have any burn marks on them. Any idea where to start looking? As I said, nothing looks damaged on the board. My $12 LCD component tester really made checking stuff easy!
