Bad Caps?

[TBoneit]

I'm sitting here looking at a motherboard that has Nichicon & Rubycon capacitors excluding two that have a type of T on top 1500uf 6.3v. Trying to install Windows XP on its first reboot it locks up on the initial XP screen. All the capacitors look ok. Is it possible for those brands to fail with no obvious signs?

As I understand it the date codes are bad on the seven 3300uf 6.3v HM(M) by the CPU assuming these are the date codes H0338 H0339?

The 3 Rubycon 2200uf 16v ZL T0407, are these OK?

Thanks
RT

[Uranium-235]

Re: Bad Caps?

unlikely, are you sure the hard drive and ram is good?

[delaware74b]

Re: Bad Caps?

The HM's are in the date code range for the 'problem' where the HM's were overfilled at the factory. They can be replaced with current production HM's with no ill effect as lopng as they're bought from a reputable supplier like badcaps.net, mouser or digikey.

[eppidrummer]

Re: Bad Caps?

unlikely, are you sure the hard drive and ram is good?

I would second that Check for bad sectors on the hd.

[mockingbird]

Re: Bad Caps?

The ones with a "T" sound like Panasonic. Replace only the Nichicons.

[PCBONEZ]

Re: Bad Caps?

Agree. - Only the HM need to go.
All of them need to go though, not just visually bad ones.

Also agree the HDD is the most likely immediate problem.

I ~have~ seen bad caps muck up an on-board drive controller such that it corrupted data but that's rather unusual and it doesn't sound like you caps are over there.

.

[TBoneit]

Re: Bad Caps?

Hello

Well, The memory was swapped and tested, The hard drive did pass on the Western Digital thorough test. The old drive was the same problem. Different memory & power supply too.

I will try new caps around the CPU when I get some free time. The two with the T on top are in a row with the seven 3300uf 6.3v HM(M). I suspect I should do them at the same time.

OTOH I do have a nice dual Xeon Precision 650 where the Power light stays solid amber which the Dell troubleshooting guide says indicates a bad Motherboard. I'm thinking of ordering the pre-made kit for it from here. I'm just indecisive whether to go Electrolyitics or the Poly kit.

I tend to collect junk, that's why I have a Dimension 8200 with 512Mb Rambus sitting around, I hate to chuck it when it works even though 512Mb is a bit low and Rambus is bleeping expensive.

Thanks for the feedback
RT

[PCBONEZ]

Re: Bad Caps?

The Panasonic [T tops] should be fine.
I've seen them mixed in with taller caps in Vcore because they are short and that helps with clearance for installing heatsinks.
The ZL should also be fine.
.
You don't have any HM over near the HDD controller or chipset do you?
Bad ones there could muck-up the HDD operation.

[Scenic]

Re: Bad Caps?

I tend to collect junk, that's why I have a Dimension 8200 with 512Mb Rambus sitting around, I hate to chuck it when it works even though 512Mb is a bit low and Rambus is bleeping expensive.

how many slots? I've got a shoebox full of RRAM (Random RAM )
upgraded my HP X4000 Workstation to 2GB PC800 RDRAM (8x 256MB) a while ago. The left over original sticks were random sizes between 64MB and 256MB. i think i still have those.. somewhere..