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| PowerBook Duo 250 death chimes |
Posted by: james_w on 2020-05-19 05:58:09
Hi all. I recently acquired a PB Duo 250. It had to sit in a drawer for a few months before I could get to it, partly because all my PSUs for Duos are in storage.
I now have a working PSU but on boot all I get are death chimes. Apple service manual says this is a memory issue... and to replace the logic board. Obviously I would prefer to rescue this board rather than do that.
It also has no video showing on the display.
I replaced all the electrolytic caps and gave the board's top and bottom a general clean with IPA but still the same issue.
I've also tried booting with and without an add-on memory board.
Any ideas?
Should I deep clean the board?
Should I replace caps in the screen?
Could it be an old PSU causing the issue by not supplying the right voltage/current? (I can test this easily)
Any ICs or other components I should be checking?
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Posted by: Papichulo on 2020-05-19 07:28:32
Is the battery removed? It could be the adapter also
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Posted by: james_w on 2020-05-19 11:32:31
It's not got a main battery nor a back up (PRAM) battery installed.
I'll give the PSU a test this evening
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Posted by: Papichulo on 2020-05-19 12:07:57
Its probably the adapter
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