I'm sure this isn't totally new, but I'll describe the chain of events specific to this PB.
I bought it on eBay untested. There wasn't that much corrosion on the board. I removed what I could, leaving (visible) three or four points of corrosion on the joints of a few resistors and maybe a small capacitor or two.
I replaced the power board out of fear some of the capcitors on it had gone bad nowithstanding some corrosion on the battery plug. When I plug in the adapter, there is a whining sound - that mostly comes from the replacement power board. The old one is less terrifying. There's a 'pop' (not in a bad way) like when a Powerbook normally turns on. That's it. When I pull the plug, the same pop occurs again as if one were powering off a Powerbook.
There's no screen activity. I think the speakers may be broken so I can't listen for a chime or anything else. There's no VGA port - or ADB port - activity, but it's also possible (for the sake of argument) that both ports are broken.
Initially, when I tried to press the on key on the keyboard, or the sound/brightness up/down on the speaker part (that can be removed) I'd get a looping electronic sound on the speakers (a bad sound). I then noticed that occurred when I pressed any key on the keyboard, so I replaced the keyboard with my 5300c's and that issue stopped. Can I, for instance, plug the 5300c screen into the 3400c? That'd be on the assumption that the VGA/ADB ports and the 3400c screen are all dead.
I realize that's an extreme longshot. The only way it would be a valid hypothesis is if nothing I have so far done would have turned the computer on [because the fan hasn't yet gone on...]. I'm guessing power's not actually getting across the board - or not properly. The real problem in trying to do this systematically is that I can't in any way vouch for the a) logic board, b ) power board, c) adapter, d) any other components...
I bought it on eBay untested. There wasn't that much corrosion on the board. I removed what I could, leaving (visible) three or four points of corrosion on the joints of a few resistors and maybe a small capacitor or two.
I replaced the power board out of fear some of the capcitors on it had gone bad nowithstanding some corrosion on the battery plug. When I plug in the adapter, there is a whining sound - that mostly comes from the replacement power board. The old one is less terrifying. There's a 'pop' (not in a bad way) like when a Powerbook normally turns on. That's it. When I pull the plug, the same pop occurs again as if one were powering off a Powerbook.
There's no screen activity. I think the speakers may be broken so I can't listen for a chime or anything else. There's no VGA port - or ADB port - activity, but it's also possible (for the sake of argument) that both ports are broken.
Initially, when I tried to press the on key on the keyboard, or the sound/brightness up/down on the speaker part (that can be removed) I'd get a looping electronic sound on the speakers (a bad sound). I then noticed that occurred when I pressed any key on the keyboard, so I replaced the keyboard with my 5300c's and that issue stopped. Can I, for instance, plug the 5300c screen into the 3400c? That'd be on the assumption that the VGA/ADB ports and the 3400c screen are all dead.
I realize that's an extreme longshot. The only way it would be a valid hypothesis is if nothing I have so far done would have turned the computer on [because the fan hasn't yet gone on...]. I'm guessing power's not actually getting across the board - or not properly. The real problem in trying to do this systematically is that I can't in any way vouch for the a) logic board, b ) power board, c) adapter, d) any other components...