500 series logic board caps

[3lectr1cPPC]

found this eBay listing which specifies the cap value for the SMD cap on the board, but then I see these two purple things:

powerbook 520 parts | eBay

Find many great new & used options and get the best deals for powerbook 520 parts at the best online prices at eBay! Free shipping for many products!

www.ebay.com

Are these two caps?
believe its @imactheknife's ebay listing.

 

[joshc]

Look to be caps yep, the silkscreen markings are C.

 

[3lectr1cPPC]

purple makes me think that they may be polymer caps - in which case they're fine to leave as is.

 

[joshc]

Yeah, those shouldn't need replacing.

 

[Paralel]

Yep, those are the caps you find a Rev B logic board. The Rev A board has cylindrical electrolytics instead. That's the easiest way to tell them apart.

 

[jeremywork]

Yep, those are the caps you find a Rev B logic board. The Rev A board has cylindrical electrolytics instead. That's the easiest way to tell them apart.

I didn’t realize there were two revisions. Do you have any Rev A photos handy?

I’ve been cataloguing 500 series stuff recently and I guess I’ve just happened to land only Rev B units…

 

[Paralel]

I'll have to try and find my spare Blackbird board that is a Rev. A. The Rev B. all around is a better design. It reduced the number of chips, realigned some of them so they are in a better place/orientation, and the electrolytics were replaced with polymer caps, except for 1 right near the two purple polymer caps.