Re: UPS and inverter questions
One side of the F1 fuse goes to the drains on the group of 94-4311 MOSFET's, the other side I'm still tracking down.
Looks like there are none that are shorted on the board that had the blown F1 fuse besides the 94-2358 that I initially replaced.
On the other board looks like two of the 200v MOSFET's are shorted, which probably explains the reason a pair of the lower voltage MOSFET's got really hot. It doesn't seem to make a whole lot of sense. None of the fuse circuits blew open on this board. It will be a real pain to replace the high power MOSFET's on this board because they're buried behind their twins. They have allen screws holding them to the heatsinks.
I'm still not quite seeing the problem on the one I'm trying to repair(the one that had the blown "fuses"). Maybe I should try the other one? It seems to be more likely to work if I trade parts.
Well, I'll get back to it tomorrow. It's almost midnight and I'm tired.
Here's a picture of the hot spot from the board, it got so hot it melted the case a little.
One side of the F1 fuse goes to the drains on the group of 94-4311 MOSFET's, the other side I'm still tracking down.
Looks like there are none that are shorted on the board that had the blown F1 fuse besides the 94-2358 that I initially replaced.
On the other board looks like two of the 200v MOSFET's are shorted, which probably explains the reason a pair of the lower voltage MOSFET's got really hot. It doesn't seem to make a whole lot of sense. None of the fuse circuits blew open on this board. It will be a real pain to replace the high power MOSFET's on this board because they're buried behind their twins. They have allen screws holding them to the heatsinks.
I'm still not quite seeing the problem on the one I'm trying to repair(the one that had the blown "fuses"). Maybe I should try the other one? It seems to be more likely to work if I trade parts.
Well, I'll get back to it tomorrow. It's almost midnight and I'm tired.
Here's a picture of the hot spot from the board, it got so hot it melted the case a little.
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