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Capacitor list for Asus CUSL2-C

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First post, by Vaudane

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First of all, thanks everyone that helped me yesterday in [1]. The time and advice was appreciated and gave me a better understanding of what was actually going on in regards to chipsets/CPUs/multipliers of the era. With a bit of gentle prodding, I've realised the best course is to forget the combined DOS/windows gaming machine and instead build two ( 😁 ), each the best of their own world. So having a hunt on the usual auction site I saw a nice deal for an Asus CUSL2 with some extra bits so I pulled the trigger on that. As the build however is based on [2] and thus was reminded by [3], these motherboards definitely will need some work. As such, while I wait for the motherboard to arrive, I shall expect it needs recapped off the bat. I'd prefer to go poly' to 'lytic but still prefer to use the original spec'd capacitance as I don't know if the caps are used for any EMC filtering in addition to the ripple current suppression so I won't be down-rating the caps.

Does anyone have a list of what caps I need to buy so I can get them before it arrives? I've seen on [4] that Asus has been known to use backwards silkscreens so I'm also bracing myself for that nonsense, but I can't find a list of caps. Sadly [5] has had their images removed.

[1] Asus CUBX Motherboard y2000/Win98 Retro build?
[2] https://www.youtube.com/watch?v=EipIq8nnwas
[3] https://www.youtube.com/watch?v=Q6YDlEKUZfo
[4] https://www.badcaps.net/forum/showthread.php?p=3660
[5] The Understudy - ASUS CUSL2-C, P3 800EB & Voodoo 3 AGP

Reply 2 of 3, by Horun

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I have a CUSL2 and could maybe get some good pictures of the main caps around the VRM, CPU and Memory, those are the most important. All the other caps (like near I/O, IDE, etc) are just standard filtering caps so do not need be a specific ESR like the main ones....

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

Reply 3 of 3, by Vaudane

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For anyone else interested, while part of my board has already been recapped, it looks like the correct values were used. The originals were RLS series-20%, 105 degC. To fully recap you need:

25v10 4mm 2
25v22 5mm 1
16v100 6.3mm 3
6.3v1000 8mm 13
6.3v1500 10mm 15

By capacitor location:

#|Value uF|Voltage V|Diameter mm|Negative
CL2 10 25 4 (5mm pad) Left
CT14 10 25 4 (5mm pad) Left
CL1 22 25 5 Left
C504 100 16 6 Bottom
CE503 100 16 6 Left
CE8B 100 16 6 Bottom
CE1 1000 6.3 8 Left
CE14 1000 6.3 8 Bottom
CE15 1000 6.3 8 Left
CE17 1000 6.3 8 Left
CE20 1000 6.3 8 Left
CE20A 1000 6.3 8 Left
CE24 1000 6.3 8 Left
CE25 1000 6.3 8 Left
CE25A 1000 6.3 8 Left
CE26 1000 6.3 8 Left
CE33 1000 6.3 8 Left
CE5V 1000 6.3 8 Left
CE5V2 1000 6.3 8 Left
CE10 1500 6.3 10 Bottom
CE11 1500 6.3 10 Bottom
CE12 1500 6.3 10 Bottom
CE12A 1500 6.3 10 Left
CE12B 1500 6.3 10 Left
CE13 1500 6.3 10 Bottom
CE27 1500 6.3 10 Left
CE28 1500 6.3 10 Left
CE30 1500 6.3 10 Left
CE31 1500 6.3 10 Left
CE4 1500 6.3 10 Left
CE5 1500 6.3 10 Left
CE6 1500 6.3 10 Left
CE7 1500 6.3 10 Left
CE8 1500 6.3 10 Left

To polymod, the capacitors CL1 is problematic as 25v22 polymer caps don't seem to exist in a 5mm diameter can. CL2 and CT14 while using cans, have 5mm pads and thus fine. I'll probably just stick to some nichicon lytic's for these three though.

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