This post is about markings on electrolytic caps and not really about the mobo on which they are mounted.
HP computer mobo, from about 2010 I guess, started freezing more and more often.
Visual inspection shows electrolytics leaking so I suspect that is the cause.
I cannot interpret the markings on the caps. No manufacturer name. All are marked 105º.
There are a total of 17 blue caps of three different types.
Type A - Qty 4 - All appear in good state and might not need replacing.
Diameter 10 mm, height 20 mm.
Marked O847. Which I would interpret as 840 uF and the initial letter O for some voltage, maybe.
Type B - Qty 8 of which 4 are definitely bad.
Diameter 8 mm, height 20 mm.
Marked O844. Which I would interpret as 0.84 uF but I begin to have serious doubts about the meaning of these codes.
Type C - Qty 5 - All need to be replaced.
Diameter 8 mm, height 12 mm.
Marked O847, same as A. Maybe same capacitance but lower voltage.
Searching the Internet for those codes, for the mobo, etc has not produced anything useful so I might have to just guess.
Types B and C are located between the RAM slots so I would deduce 6.3 volt would be enough. Maybe they are paired so the big one provides the bulk of the capacitance while the small one has extremely low ESR for transient response?
Initially and absent any further info I would be inclined to leave A's alone and replace all B's and C's with a single value of, say, 1000 uF, 6.3 V, low ESR, 105º, if I can find them in 8 mm diameter. Diameter is critical while height does not matter.
Can anyone provide info on similar caps from other motherboards?
What would you recommend?