They are most certainly NOT tantalums. they are plastic encased aluminum electrolytics. you can see the corrosion where they need changed.
Yup - That was 100% correct. The caps were just tiny little electrolytics in a small square case. They were definitely leaky as well. I was able to break the legs off super easy by just rocking the little boxes back and forth.
Underneath was definitely some corrosion as techknighted noted.
Still, everything cleaned up nicely
I used a damp shop cloth as a heat sink to avoid damaging the LCD. I'm not sure this was necessary but I a previous post made me think it would be better to be safe then sorry.
I replaced the leaky electrolytes with some small MLCCs:
As the MLCCs have exposed ends and there is some metal shielding that overtop, I used some paper as an insulator.
I recapped the logic board and then put it all together (after breaking a few clips due to the brittle plastic (but it still holds together perfectly)). Taking this machine apart is a royal pain...
And it booted up right away!
When I plug it in, it makes a small high pitched noise at first. I think it always did this to be honest but I'm not too interested in troubleshooting it now. At least the caps aren't going to leak anymore given that they were replaced with polymer and ceramics.
These are the Mouser caps I used:
810-C3216X7R1V335M6A x 8 (MLCCs for the display)
647-PCV1V101MCL1GS x 3 (100 uf 35v 10mm)
647-PCJ1C331MCL1GS x 1 (330 uf 16v 10mm)
647-RHS1V101MCN1GS x 2 (100 uf 35v 8mm)
667-25SVPK33M x 1 33uf 25v