Hot Power Supply

[rchungtw]

My Antec SL350 when taken off has the last 3 pins of the 20-pin power
connector burnt to a brown
color. The pins correlate to the 3.3v which are orange in color. Is the
problem from the power supply
or the motherboard? ASUS Probe did show the 3.3v at around 2.8v before
I took the SL350 out.
Also, I replace the SL350 with a Antec NeoPower480 and it showed the
3.3v to be around 3.1v and
the 5v around 4.8v. The 12v is at 11.87v. Where is the problem? Is it
the power supplies or the
motherboard?

 

[ric]

My Antec SL350 when taken off has the last 3 pins of the 20-pin power
connector burnt to a brown
color. The pins correlate to the 3.3v which are orange in color. Is the
problem from the power supply
or the motherboard?

You are putting too much current through those three 3.3v wires. Could
be a MB problem. Could be a MB/PSU compatibility issue.

Are there any other power headers on your MB? Does your MB accept
a 24 pin MB/PSU connector? The 24 pin connector had FOUR 3.3v
wires instead of three. What MB and peripherals are you using?

I doubt it is the PSU except if bad crimps on the orange wire connectors
or too small a gauge of wire was the culprit. Is the discoloration more
pronounced closer to the contacts than farther away? If so, it is either
bad crimps on the contact pins, or bad interface between male and
female pins.

 

[Mxsmanic]

My Antec SL350 when taken off has the last 3 pins of the 20-pin power
connector burnt to a brown
color. The pins correlate to the 3.3v which are orange in color. Is the
problem from the power supply
or the motherboard? ASUS Probe did show the 3.3v at around 2.8v before
I took the SL350 out.
Also, I replace the SL350 with a Antec NeoPower480 and it showed the
3.3v to be around 3.1v and
the 5v around 4.8v. The 12v is at 11.87v. Where is the problem? Is it
the power supplies or the
motherboard?

At first glance, it sounds like you're drawing more power than the PSU
is really designed to put out, or you're right on the edge of the
PSU's capacity.

Make sure the fan is running, too, and that nothing obstructs cooling
of the PSU.

 

[Davy]

The fault could also be caused by loose wire's where the wire goe
into the plug, these are usually 'crimped', this can also be cause
by loose fitting contact/connectors between the plug and socket

Passing about 3 volts or so at 20 amps will cause severe burning
charring if the crimps become loose or even tarnished, this woul
create a 'resistive' connection - seen it many times in Tv's aroun
the scan coil connections

Dav