So at some point within the last week or so while my machine was off, it seems that my Octane2's 747W Cherokee PSU decided to die. The machine just won't power on, no fanspin or anything. After pulling the PSU out, it seems that the death was caused by some sort of a short to GND by these 3 pins. There 3 pins are connected to some sort of +V red wires internally, although I'm unsure of the voltages.
As for the internals of the PSU it doesn't seem like any of the capacitors have been damaged and they look rather clean. No leaking capacitors. However, I did notice that one of the two fuses on the AC input had been blown, as it had a resistance of 490kOhms when measured in-circuit.
As for what actually caused it, I don't know. All the components on the frontplane look fine. The one exception to this is this tantalum capacitor, which had a fair amount of black residue on it, most of which I scrubbed off with isopropyl alcohol in an attempt to read the bottom number. Conductivity tests with a multimeter show that this capacitor is tied to the pins that were burned (through what, I don't know, however). Perhaps this capacitor developed an internal short of some sort? I'd have to pull it off the frontplane to measure the capacitance.
I've got a few different ideas so far:
1. Buy a new PSU. This is probably the simplest option. My main concern is that if there's something wrong on the frontplane, it'll burn out the new PSU.
2. Try and repair the PSU and/or replace the cap on the frontplane. Other than the fuse, I'm not sure what needs to be replaced yet - possibly a MOSFET?
3. Just replace both the frontplane and the PSU. I really don't want to have to do this and would prefer if I could fix at least one of them.
Does anyone have any suggestions of what I should try and look for when trying to repair this? It's a fairly good Octane2 so I'd really like to try and save it.
As for the internals of the PSU it doesn't seem like any of the capacitors have been damaged and they look rather clean. No leaking capacitors. However, I did notice that one of the two fuses on the AC input had been blown, as it had a resistance of 490kOhms when measured in-circuit.
As for what actually caused it, I don't know. All the components on the frontplane look fine. The one exception to this is this tantalum capacitor, which had a fair amount of black residue on it, most of which I scrubbed off with isopropyl alcohol in an attempt to read the bottom number. Conductivity tests with a multimeter show that this capacitor is tied to the pins that were burned (through what, I don't know, however). Perhaps this capacitor developed an internal short of some sort? I'd have to pull it off the frontplane to measure the capacitance.
I've got a few different ideas so far:
1. Buy a new PSU. This is probably the simplest option. My main concern is that if there's something wrong on the frontplane, it'll burn out the new PSU.
2. Try and repair the PSU and/or replace the cap on the frontplane. Other than the fuse, I'm not sure what needs to be replaced yet - possibly a MOSFET?
3. Just replace both the frontplane and the PSU. I really don't want to have to do this and would prefer if I could fix at least one of them.
Does anyone have any suggestions of what I should try and look for when trying to repair this? It's a fairly good Octane2 so I'd really like to try and save it.