iMac with bulging capaciters

[Gianni]

Re: iMac with bulging capaciters

Since lately I started getting the system to hang sometimes, I decided to substitute the bad capaciters with new ones.
..........replaced by others (I don't know the brand) with the same characteristics, but now.. the system doesn't boot anymore.
How is this possible?

the caps they put i cannot recognise the brand probably shit
but that should not be a problem initially

if it still ran there is no reason for it not to after the recap.

I tried to use different capacitor on a board and I couldn't get it pass prime95. So I had to redo it correctly with proper capacitors.

The first MOBO I recapped 3 or 4 years ago had all caps damaged, the caps around CPU were completely exploded on the top... but it was able to boot. At that time I was ignorant about badcaps so I didn't check the PSU.
Recently I tried to save a P4PB MOBO that had crap CGS caps completely ruined, the MOBO was able to BOOT but it crashed any time Win tried to start.
So I think, like some of you have written, that even if you use a non LOW ESR caps, the MOBO should boot if you use caps with right uF value and voltage ratings. They can't be worst than exploded/bulged/leaking caps.
If MOBO doesn't boot after recap, probably something have been damaged, there is a short circuit somewhere or some parts have been mounted in the wrong way.

So it looks like the PSU needs to be recapped.

Maybe after recapping an powering it up the PSU has died suddenly, that is possible.

He's in a small town in Italy, so the correct low ESR caps may not be available to him.

I had the same problem, I live in Italy in a small town, but I was able to order Panasonic FM caps from RSComponents.
I contacted Digikey, they have good caps but I had no clear information about price and delivery charges.
There is also Distrelec but they have only Rubycon ZL and ZLH as good caps. They have also Nic Caps NRSZ Series but I don't know if they are a good brand.

Ciao
Gianni

[PCBONEZ]

Re: iMac with bulging capaciters

NIC Components is a good Japanese brand.
They are a smaller company so one hears about them less often.

There is a confusion between NIC and another company.
There is a non-Japanese brand that has the same name (for their company) as one of NIC Components series' of caps.

It's not intentional/deliberate/fraud/counterfeit, it's just confusing.

If you see NRSY with a NIC logo then it's a NIC Components NRSY series cap.
[Good cap]

If you see NRSY *with no NIC logo* then it's the other brand of cap and the "NRSY" is the company logo - not the series.
[Questionable cap - Supermicro uses them sometimes.]

There may or may not be a series number on NRSY ~brand~ caps.
Some have series marked, some don't.
Most I've seen had the series on them.
[They wouldn't put both the NRSY logo AND a series name if they were trying to fake being NIC brand.]

~~~

There will be a NIC logo on NIC brand NRSY series caps.

It's easy.... No NIC logo then it's not NIC brand.

.

[Newbie2]

Re: iMac with bulging capaciters

Even with good general purpose caps of the same rating, your motherboard should still be able to POST if it did POST last time with the bad caps, unless something wrong happened in the repair process.

The generic caps can even be temporary until better caps can be purchased.

[ratdude747]

Re: iMac with bulging capaciters

[Krankshaft]

Re: iMac with bulging capaciters

NIC Components is a good Japanese brand.
They are a smaller company so one hears about them less often.

Ramsey still uses Nic caps on their kits 10uf and lower capacitance. I didn't know that they were a Japanese brand or if they were good caps though good to know.

They always use high quality caps on their kits (Panasonic, Chemicon, Nichicon, etc) so it's good to know that they still are using good caps.