Static noise when plugging in; won't boot

Hello. I recently purchased an untested PowerBook 5300cs; once I received it, I found there to be a large amount of corrosion from the NiMH battery. Note that the majority of the pieces of circuitry did not have much, if any, corrosion on them.

After a two week process of soaking everything in vinegar and isopropanol, I plugged the laptop into the wall (with the battery removed, of course). It made a noise reminiscent of static, and showed no other signs of life. I unplugged it and replugged it; it didn’t make the static noise again, but it still wouldn’t boot. The HDD did not spin up, and the display (obviously) did not turn on.

I’m hoping it’s fixable, but I’m pretty sure the logic board is fried. Any help would be much appreciated. Thank you.

EDIT: After leaving it unplugged for a day and trying to start it up again, it started making the static noise again. Only the first few cycles of unplugging/replugging it, did it make the noise, however. (Note that “the static noise” is about half a second of static coming from the speaker built into the monitor)

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Just curious, but where did you get the idea to soak everything (?) and what did you mean by "everything".

da

@aactech When I first realized that I would have to clean the laptop of corrosion, I made a Reddit thread about it here: ( https://www.reddit.com/r/VintageApple/co... - my username there is "kittenboxer"). I was informed that soaking "everything" (by which I mean the logic board, the video card daughterboard, the IR board, the touchpad assembly, and the battery PSU board thing) in vinegar would get rid of the corrosion, and should be followed by a rinsing in distilled water, then isopropanol. It did work to get (most of) the corrosion off, but apparently it didn't work well enough...

da

Thanks for replying. Ya, just remembered that years ago I just used a medium stiff brush and water and it worked. Remember vinegar is acetic acid and can "eat" in to things. But hey it was probably too late in your case. I still question the vinegar method.

Sometimes soldered jumper wires can get past the damaged areas but with multilayered circuit boards it can be difficult.

Good luck.

da

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