Antec Neo 480 Problem

[Edward_B]

Hello,

I have an Antec Neo 480 ATX PSU. When I shorted out pin 14 on the main
connector, it would turn on fine, but when connected to a known good
motherboard, it would not power up. It would give standby power to the
mobo, but not bring it to full power. So I took apart the PSU and
discovered two bulging electrolytic capacitors on the secondary side,
and a resistor that appeared to have failed. The resistor turned out
to still be functional, but it had overheated to the point of
destroying the shrink wrap around it and the paint, so I replaced it
with a higher wattage version and also replaced the capacitors.

After that it would power up the mobo under minimal load (graphics
card and RAM plugged in, but no CPU or anything else.) I got excited
thinking I had fixed it, but once I added CPU, hard drive, etc., it
would no long power it up. But it still provides standby power and
still powers up with no load (via shorting pin 14.)

I am still trying to absorb everything at http://www.repairfaq.org/sam/smpsfaq.htm,
but from what I have read so far it looks like the only components
that are likely to fail under load but work fine when not under load
are the rectifiers. Is this true?

I don't have any spare rectifiers, and I don't know of a way to test
them with an ohm meter while they are under load. Is there a way?

For about $10 or $15 I could just order new ones, replace them and see
what happens, but that could get expensive fast if I have to keep
doing that with other components.

Or does anybody have any better ideas?

Thanks for your time.

 

[JB]

"Edward_B" <thewarden@gmail.com> wrote in message
news:41a6aef9-bbd8-4d5b-9ab7-59f2f67c10c6@p36g2000vbn.googlegroups.com...

Hello,

I have an Antec Neo 480 ATX PSU. When I shorted out pin 14 on the main
connector, it would turn on fine, but when connected to a known good
motherboard, it would not power up. It would give standby power to the
mobo, but not bring it to full power. So I took apart the PSU and
discovered two bulging electrolytic capacitors on the secondary side,
and a resistor that appeared to have failed. The resistor turned out
to still be functional, but it had overheated to the point of
destroying the shrink wrap around it and the paint, so I replaced it
with a higher wattage version and also replaced the capacitors.

After that it would power up the mobo under minimal load (graphics
card and RAM plugged in, but no CPU or anything else.) I got excited
thinking I had fixed it, but once I added CPU, hard drive, etc., it
would no long power it up. But it still provides standby power and
still powers up with no load (via shorting pin 14.)

I am still trying to absorb everything at
http://www.repairfaq.org/sam/smpsfaq.htm,
but from what I have read so far it looks like the only components
that are likely to fail under load but work fine when not under load
are the rectifiers. Is this true?

I don't have any spare rectifiers, and I don't know of a way to test
them with an ohm meter while they are under load. Is there a way?

For about $10 or $15 I could just order new ones, replace them and see
what happens, but that could get expensive fast if I have to keep
doing that with other components.

Or does anybody have any better ideas?

Thanks for your time.

Find a new on sale for maybe $40 and quit wasting your time. The time you
spend finding sources for parts will probably exceed that. If you have
time to waste, you can make a project out of the bad one while still having
the use of a working machine without worrying about reliability issues.

 

[Edward_B]

On Sep 28, 10:42 am, "JB" <nos...@goofball.net> wrote:

"Edward_B" <thewar...@gmail.com> wrote in message

news:41a6aef9-bbd8-4d5b-9ab7-59f2f67c10c6@p36g2000vbn.googlegroups.com...

Hello,

I have an Antec Neo 480 ATX PSU. When I shorted out pin 14 on the main
connector, it would turn on fine, but when connected to a known good
motherboard, it would not power up. It would give standby power to the
mobo, but not bring it to full power. So I took apart the PSU and
discovered two bulging electrolytic capacitors on the secondary side,
and a resistor that appeared to have failed. The resistor turned out
to still be functional, but it had overheated to the point of
destroying the shrink wrap around it and the paint, so I replaced it
with a higher wattage version and also replaced the capacitors.

After that it would power up the mobo under minimal load (graphics
card and RAM plugged in, but no CPU or anything else.) I got excited
thinking I had fixed it, but once I added CPU, hard drive, etc., it
would no long power it up. But it still provides standby power and
still powers up with no load (via shorting pin 14.)

I am still trying to absorb everything at

http://www.repairfaq.org/sam/smpsfaq.htm,

but from what I have read so far it looks like the only components
that are likely to fail under load but work fine when not under load
are the rectifiers. Is this true?

I don't have any spare rectifiers, and I don't know of a way to test
them with an ohm meter while they are under load. Is there a way?

For about $10 or $15 I could just order new ones, replace them and see
what happens, but that could get expensive fast if I have to keep
doing that with other components.

Or does anybody have any better ideas?

Thanks for your time.

Find a new on sale for maybe $40 and quit wasting your time.  The time you
spend finding sources for parts will probably exceed that.   If you have
time to waste, you can make a project out of the bad one while still having
the use of a working machine without worrying about reliability issues.

Yeah, I'm making a project out of it. Not that my time is immensely
valuable from a monetary standpoint, but I don't have any delusions
about actually saving money with how much time it will take me to
learn all this. I have a $40 supply picked out that I may end up
ordering, but this is all for a secondary, non-critical system, so I'm
not in a rush. It also wouldn't matter much if I fix this supply and
run the system on it,as again, it's non-critical and it won't be a big
deal if the PSU gives out sooner rather than later.