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John Gibbs

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  1. John Gibbs

    Powerbook 5300cs with corrosion

    Thx for the info, all. . So the memory board from the 5300 gives me the chimes of death in the 190 so I assume it’s toast. Still the 190 works so moving to that for my primary project for now. I’ve hot a 3com Ethernet card arriving soon and will be setting up Netatalk 2 in My Linux server. Will keep the community informed!
  2. John Gibbs

    Powerbook 5300cs with corrosion

    Oh no! So I picked up a working PB190 that arrived today - I understand there's a lot of commonality between parts. I might try the power daughtercard from the 190 in the 5300. Sadly the battery from the 190, while not as bad as the one from the 5300, is also toast. Mike, if the power daughtercard swap works (when I'm brave enough to try!), then possibly something like that might resurrect yours. Incidentally the 5300 has an 8MB memory card and the 190 has 4 - are they swappable? Cheers JG
  3. John Gibbs

    Powerbook 5300cs with corrosion

    Thanks both. Mike, let me know how you get on. $159 is over twice what I paid for the laptop but if it works :) Bibilit, the caps look worse in the photo but a few are SLIGHTLY bulging on the top, barely... I can't see how to unsolder them though if I wanted to replace. The good news is my PCB cleaner arrived today and I cleaned off the daughterboard. Bad news is still just the startup beep. I will continue over the weekend as I haven't fully reassembled it yet. Cheers all! JG
  4. John Gibbs

    Powerbook 5300cs with corrosion

    Awesome Mike, thx! Is that a new PRAM battery or the actual PB battery? Where did you get it? Cheers John
  5. Hello all! I picked up a PB5300cs over the weekend, an eBay find. I should have taken "before" photos but didn't - the battery either leaked or there was some sort of electrolytic reaction as a good half of the case was covered in what looked like copper sulfate. Luckily, the motherboard and RAM card, HDD, video out card all seem unscathed except for some CuS on the metal shields. You can still see some that vinegar/lemon juice didn't get. Pre-cleaning, the unit gave a reassuring PPC startup bong when power was connected and responded to control-option-power to reboot but the HDD didn't spin up and there was no other life. So I disassembled and washed with lemon juice/vinegar, rinsed with de-ionized water and have allowed it to dry fully. The result is the same as before - bong but no other life. There is some white corrosion around where the battery/power daughterboard connector is, on the daugherboard (see photo) and I am awaiting delivery of PCB cleaner to try to shift that. All the capacitors seem OK. The PSU is putting out 24V (well, 23.8) so that seems OK. My theory is that the corrosion on the power board is causing the rest of the system to not get enough power... thoughts? Any other tips as this is my first vintage Mac rescue? Does it matter if I have the PRAM battery connected and if it's dead? Thanks! John
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