Bad Caps.

B

Baron

Guest
Well bad caps are still alive & well.

My machine just decided not to start up last night.

Two caps in the memory PSU circuits had decided to give up the ghost.
Both were bulging and one was actually leaking gunge. I have replaced
both and the machine is back up and running.

For those who want to know, the machine is a Packard Hell Pentium D 3000
dual core. Fitted with an ASR Prescott 800 mainboard.

The main CPU PSU caps are very hot 81C measured temperature. I'm
wondering, should I replace them as well? The two toroid coils on
either side and the vertical Choke at the rear are running well over
95C. Is/could this be normal for these components?

Comments !
--
Regards:
Baron.
 
In article <fnne9g$t31$1@aioe.org>,
Baron <baron.nospam@linuxmaniac.nospam.net> wrote:

Well bad caps are still alive & well.
....
The main CPU PSU caps are very hot 81C measured temperature. I'm
wondering, should I replace them as well? The two toroid coils on
either side and the vertical Choke at the rear are running well over
95C. Is/could this be normal for these components?
Click to expand...
Make sure that the caps are 105C rated - probably normal. OTOH, they do
have a lifetime - how old is this machine? Might not be a bad idea to
just replace them with new 105C parts and be sure.

I have at least two, and perhaps 4 (not as obvious what's wrong with the
second pair) of Apple eMacs with bad capacitors, which had one of those
irritating secret repair extensions - which expired before I figured out
what the problem was and discovered the not-very-well publicized repair
extension (the ones with clearly bad capacitors start up, but freeze -
in the early stages this was infrequent enough that it was not obvious
why - only one of the bad capacitors is visible until the case is opened
up, and the other 7 come to light). Just barely over 3 years old. In
this pair, the affected capacitors are all the same size/voltage/brand,
and none of the others appear to be affected.

--
Cats, coffee, chocolate...vices to live by
 
Ecnerwal wrote:

In article <fnne9g$t31$1@aioe.org>,
Baron <baron.nospam@linuxmaniac.nospam.net> wrote:

Well bad caps are still alive & well.
...
The main CPU PSU caps are very hot 81C measured temperature. I'm
wondering, should I replace them as well? The two toroid coils on
either side and the vertical Choke at the rear are running well over
95C. Is/could this be normal for these components?

Make sure that the caps are 105C rated - probably normal. OTOH, they
do have a lifetime - how old is this machine? Might not be a bad idea
to just replace them with new 105C parts and be sure.
Click to expand...
Yes I did look, they are marked 105C 3300Uf @ 6.3 volts. The machine
itself is about two years old, possibly 3 to 6 months older depending
how long it was in stock before I bought it.

I have at least two, and perhaps 4 (not as obvious what's wrong with
the second pair) of Apple eMacs with bad capacitors, which had one of
those irritating secret repair extensions - which expired before I
figured out what the problem was and discovered the not-very-well
publicized repair extension (the ones with clearly bad capacitors
start up, but freeze - in the early stages this was infrequent enough
that it was not obvious why - only one of the bad capacitors is
visible until the case is opened up, and the other 7 come to light).
Just barely over 3 years old. In this pair, the affected capacitors
are all the same size/voltage/brand, and none of the others appear to
be affected.
Click to expand...
I have had machines that have done that, random freezes and spontainous
reboots. In every case its been down to the electrolytic capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never did
get to find out the real cause. That was an Emachines 2210. Biggest
load of crap I have ever installed Linux on!

I'll order some new caps anyway. Just in case. By the way I just
rechecked the cap and coil temperatures they haven't altered in the
past four hours.

--
Regards:
Baron.
 
Baron wrote:

I have had machines that have done that, random freezes and spontainous
reboots. In every case its been down to the electrolytic capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never did
get to find out the real cause. That was an Emachines 2210. Biggest
load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high voltages
Click to expand...
just before it crapped out. As I recall, it was a 250W Bestec unit.

David
 
David Snowdon wrote:

Baron wrote:


I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never did
get to find out the real cause. That was an Emachines 2210. Biggest
load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high voltages
just before it crapped out. As I recall, it was a 250W Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
Click to expand...
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.
 
"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:


I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never did
get to find out the real cause. That was an Emachines 2210. Biggest
load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high voltages
just before it crapped out. As I recall, it was a 250W Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.
Click to expand...


Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT Hot, if
you continue to let it go like that it will blow up and then you won't have
a clean power. Your electronic components will fry after that. Very
likely the cap must be rated lower than it's supposed to handle, or you
must have more AC power coming into the unit.


Jack.
 
Jakthehammer wrote:

"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:


I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic
capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never
did
get to find out the real cause. That was an Emachines 2210.
Biggest load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high
voltages just before it crapped out. As I recall, it was a 250W
Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.



Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT
Hot, if you continue to let it go like that it will blow up and then
you won't have
a clean power. Your electronic components will fry after that. Very
likely the cap must be rated lower than it's supposed to handle, or
you must have more AC power coming into the unit.


Jack.
Have you ever tried putting your fingers on the CPU PSU caps in your
Click to expand...
computer ? Don't burn your fingers !
--
Best Regards:
Baron.
 
"Baron" <baron.nospam@linuxmainiac.nospam.net> wrote in message
news:fo7oud$cei$1@aioe.org...
Jakthehammer wrote:


"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:


I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic
capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never
did
get to find out the real cause. That was an Emachines 2210.
Biggest load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high
voltages just before it crapped out. As I recall, it was a 250W
Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.



Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT
Hot, if you continue to let it go like that it will blow up and then
you won't have
a clean power. Your electronic components will fry after that. Very
likely the cap must be rated lower than it's supposed to handle, or
you must have more AC power coming into the unit.


Jack.
Have you ever tried putting your fingers on the CPU PSU caps in your
computer ? Don't burn your fingers !
--
Best Regards:
Baron.
Click to expand...
Yes I had, and Have you ever seen caps blowing up in front of your face?
 
Jakthehammer wrote:
"Baron" <baron.nospam@linuxmainiac.nospam.net> wrote in message
news:fo7oud$cei$1@aioe.org...
Jakthehammer wrote:

"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:

I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic
capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never
did
get to find out the real cause. That was an Emachines 2210.
Biggest load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high
voltages just before it crapped out. As I recall, it was a 250W
Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.


Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT
Hot, if you continue to let it go like that it will blow up and then
you won't have
a clean power. Your electronic components will fry after that. Very
likely the cap must be rated lower than it's supposed to handle, or
you must have more AC power coming into the unit.


Jack.
Have you ever tried putting your fingers on the CPU PSU caps in your
computer ? Don't burn your fingers !
--
Best Regards:
Baron.

Yes I had, and Have you ever seen caps blowing up in front of your face?



Yep! two serial caps,250volts apiece, accidentally connected
Click to expand...
in reverse to 500 volts. They exploded nicely, spraying electrolyte
all over the place.(and in my face).
 
"Sjouke Burry" <burrynulnulfour@ppllaanneett.nnlll> wrote in message
news:47a789f8$0$25478$ba620dc5@text.nova.planet.nl...
Jakthehammer wrote:
"Baron" <baron.nospam@linuxmainiac.nospam.net> wrote in message
news:fo7oud$cei$1@aioe.org...
Jakthehammer wrote:

"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:

I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic
capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never
did
get to find out the real cause. That was an Emachines 2210.
Biggest load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high
voltages just before it crapped out. As I recall, it was a 250W
Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.


Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT
Hot, if you continue to let it go like that it will blow up and then
you won't have
a clean power. Your electronic components will fry after that. Very
likely the cap must be rated lower than it's supposed to handle, or
you must have more AC power coming into the unit.


Jack.
Have you ever tried putting your fingers on the CPU PSU caps in your
computer ? Don't burn your fingers !
--
Best Regards:
Baron.

Yes I had, and Have you ever seen caps blowing up in front of your face?



Yep! two serial caps,250volts apiece, accidentally connected
in reverse to 500 volts. They exploded nicely, spraying electrolyte
all over the place.(and in my face).
Click to expand...


Good for you and for me, this way we learned the hard way. My incidents
were happening 30-yrs ago, 3000-5000Volts, 0.7amp. That made me a funny
guy today....Heehee........Donchaknow?.............
 
Jakthehammer wrote:

"Baron" <baron.nospam@linuxmainiac.nospam.net> wrote in message
news:fo7oud$cei$1@aioe.org...
Jakthehammer wrote:


"Baron" <baron.nospam@linuxmaniac.nospam.net> wrote in message
news:fnq3uv$n8j$1@aioe.org...
David Snowdon wrote:

Baron wrote:


I have had machines that have done that, random freezes and
spontainous
reboots. In every case its been down to the electrolytic
capacitors.
I've only had one machine where the caps were fine! That machine
suddenly destroyed itself, CPU, RAM, Video Card the lot. I never
did
get to find out the real cause. That was an Emachines 2210.
Biggest load of crap I have ever installed Linux on!

Emachines used to have a power supply that would output high
voltages just before it crapped out. As I recall, it was a 250W
Bestec unit.

David
Yes David, you are right, the PSU was a 250W Bestec and it had
packed
up. Dead as the proverbial Dodo it was. Oddly the internal fuse
wasn't blown.
--
Regards:
Baron.



Is this Electrolytic Capacitor? Caps are supposed to be COOL, NOT
Hot, if you continue to let it go like that it will blow up and then
you won't have
a clean power. Your electronic components will fry after that.
Very likely the cap must be rated lower than it's supposed to
handle, or you must have more AC power coming into the unit.


Jack.
Have you ever tried putting your fingers on the CPU PSU caps in your
computer ? Don't burn your fingers !
Click to expand...
I was being serious here. Under normal conditions they will run hot!

--
Best Regards:
Baron.

Yes I had, and Have you ever seen caps blowing up in front of your
face?
Click to expand...
Yes ! But what do you think the markings are in the top ? They are
there to prevent that kind of destructive behaviour. Caps do run hot
under certain conditions unless someone has found a way to reduce ESR
to zero.

--
Regards:
Baron.
 
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