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Powerbook G3 Pismo seemingly dead?

EvieSigma

Young ThinkPad Apprentice
I recently got a Pismo (with a 500MHz PPC7410 upgrade!) but it's...seemingly completely dead? Plugging in my 45W yo-yo adapter does absolutely nothing, neither does the key combination for a PRAM reset. Is something fried? Do I need a different power adapter?
 

greystash

Well-known member
The 500Mhz CPU is nice! They're quite hard to find now.
I'm pretty sure the power cards fail on the Pismo often. I had the same issue, no power or signs of life but after replacing the power card from another Pismo (working) it booted normally. It would be worth re-capping the machine as this is probably where the problem is coming from.

Trying another power adapter is a good place to start, otherwise either a new power card or re-capping might bring it back to life.
 

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MacUp72

Well-known member
I had a Pismo with a standard G3 400 Mhz daugtherboard with booting problems, I carefully removed the board and inspected it..two little pins were ever so slightly crooked, I carefully bent it back..it never booted again..temper temper
I hate those connector boards, the latest 500 mhz models had better ones
Bildschirmfoto 2024-02-03 um 08.43.39.jpg
 

EvieSigma

Young ThinkPad Apprentice
The only one of those I found on eBay is $40 shipped so I hope I don't need one...I can try swapping the other power board from my working Lombard into the Pismo, though.
 

EvieSigma

Young ThinkPad Apprentice
It took me a couple months but I tried swapping the DC-in board and the Pismo is still dead. I guess the next step would be that power card?
 

Byrd

Well-known member
Common fix for many here with dead Pismos over the years has been to pop up the keyboard and disconnect the PRAM battery. Failing that, reseat the CPU daughter card, RAM, contact clean all connectors
 

beachycove

Well-known member
Yo-yo power adapters in my experience are very prone to failure. The wires break at the flex points, especially at the adapter end, in where the sun don’t shine and the thing is nigh impossible to repair.

I’d try another adapter or test the thing before resorting to further, possibly unnecessary surgery on the Pismo. It ought to run from any adapter with the same jack, i.e., one from the Duo series, the 3400, the Wallstreet and obviously the Pismo itself. I’d maybe remove battery and optical if working with a older adapter, as it would presumably be marginal. The rest might be okay — though I find that the caps are starting to go in Wallstreet adapters these days.
 

EvieSigma

Young ThinkPad Apprentice
Yo-yo power adapters in my experience are very prone to failure. The wires break at the flex points, especially at the adapter end, in where the sun don’t shine and the thing is nigh impossible to repair.

I’d try another adapter or test the thing before resorting to further, possibly unnecessary surgery on the Pismo. It ought to run from any adapter with the same jack, i.e., one from the Duo series, the 3400, the Wallstreet and obviously the Pismo itself. I’d maybe remove battery and optical if working with a older adapter, as it would presumably be marginal. The rest might be okay — though I find that the caps are starting to go in Wallstreet adapters these days.
The yo-yo works fine booting my Lombard and my Wallstreet so it's gotta be the Pismo that's the problem.
 
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