biostar u8068 cap layout help

[yonu]

hey I need some help guys i picked up a biostar u8068 ver 1.1 from a electronic shop today to replace a board in a project I am working on and they siad they were removing caps from it since it was so old the problem I am having is none of the solder pads look like they have been messed with I can provide pics if that helps I just don't want to toss a cpu in it and fire it up if any have been removed.

Thanks,
yonu

[ratdude747]

Re: biostar u8068 cap layout help

here:

an overview of your board:



but that is small, i found a bigger one but part is obstructed by the cpu fan:



another view:



go from there.

[yonu]

Re: biostar u8068 cap layout help

Great thinks that helps now question the caps that were removed should be 16v 2200f the closest I have on hand is 16v and 2700f should I be ok with those or do I need to find the exact ones?

Thanks,
yonu

[370forlife]

Re: biostar u8068 cap layout help

2700uf will be fine, if anything, a little better.

What brand and series? Make sure they are low-esr.

[yonu]

Re: biostar u8068 cap layout help

they are just some nonname ones i had laying around ok it replaced the 2 caps that were removed but i get nothing when putting power to the board so i stuck my post test card in a pci slot and according to it it has 3.3v but nothing else when i hit the power button nothing no other rails come on now post codes nothing I know the psu is good

any thoughts,
yonu

[370forlife]

Re: biostar u8068 cap layout help

No-name caps never good. Just use good caps from the start.

[yonu]

Re: biostar u8068 cap layout help

hey like i said I had them, guess I will go see what I can find tomorrow no real electronic shops around here

[370forlife]

Re: biostar u8068 cap layout help

Does the southbridge get hot while the psu is plugged in? If it does, your motherboard is fried from some cheap psu with a high 5vsb.

[PCBONEZ]

Re: biostar u8068 cap layout help

2700uF is fine.
->> But that's NOT what's important.
What is the ESR and Ripple on the old caps.
What is the ESR and Ripple on the new caps.

[yonu]

Re: biostar u8068 cap layout help

not sure will check on the southbridge

[yonu]

Re: biostar u8068 cap layout help

well i ran and checked the southbridge it doesn't get hot but it does get warm so i would take that as they sold me a board with a bad southbridge

[ratdude747]

Re: biostar u8068 cap layout help

its supposed to get warm, but not hot. there is a reason why southbridge coolers exist. order some caps and give it a shot.

[yonu]

Re: biostar u8068 cap layout help

ok I will give it a try

[ratdude747]

Re: biostar u8068 cap layout help

good luck!

[yonu]

Re: biostar u8068 cap layout help

well I got the caps replaced with good ones and is doing the samething so I am just going to take it as a bad board and start shopping again

Thanks,
yonu
PS. anyone got a socket 478 matx for sale cheap lol