No brand psu 12v diode failed

[joshnz]

Hi I have a 350Watt psu
I was plugging in a usb cable into my sisters computer I knocked the power cord
and it started arcing and the pc lost power no big deal.

So I re-plugged the power cord and the pc tried to start but no go,
The power light was green so I turned the psu off at the power switch then turned the power switch back on after some time, the psu ticked as to power on, same problem.

So I disconnected it from the mb and tried to start it manually just got a tick and nothing, then unplugged all connectors same issue.

Measured the voltages 5v tried to rise 12v had a few millivolts.

Tested for shorts the 12v rail was shorted.

I removed the diode for the 12v rail and is shorted on one half.

It had a STPR1620CT can I use a FEP16AT?
The only only difference is reverse voltage 200v old new 50v
and 5ns more recovery time so a little slower than the old one.

[Th3_uN1Qu3]

Re: No brand psu 12v diode failed

Some people will say 50v reverse voltage is too low for a 12v rail, but i've successfully used such diodes. Give it a shot.

[joshnz]

Re: No brand psu 12v diode failed

Thanks Th3_uN1Qu3.
I will give it a go in morning hope I can find a friendly electronics repair shop I don't have my tools with me this visit

[Pentium4]

Re: No brand psu 12v diode failed

I'm curious to see how this works out for you. Can you post some pics of the PSU or at least the specs on the label?

[joshnz]

Re: No brand psu 12v diode failed

here u go

[joshnz]

Re: No brand psu 12v diode failed

I found a better spec diode at the same place

STPR1620CT (old)
IF(AV) 2 x8A
VRRM 200 V
Tj (max) 150°C
VF (max) 0.99 V
trr (max) 30 ns

BYV42-150
IF(AV) 2 x15A
VRRM 150 V
Tj (max) 150°C
VF (max) 0.85 V
trr (max) 28 ns
argh it's not in stock

[joshnz]

Re: No brand psu 12v diode failed

Yay it is running with the FEP16AT .

wtf $17.50 to solder it in .

[joshnz]

Re: No brand psu 12v diode failed

power supply is still running has been the whole time

Thanks for all advice.

[Pentium4]

Re: No brand psu 12v diode failed

Looks like an L&C. Glad to hear it's working!!!! What is it powering?

[joshnz]

Re: No brand psu 12v diode failed

CPU: Intel Celeron 325 Prescott 2.53GHz
MB: Intel Corporation D845GVSR
RAM:2X512
1X HDD
1X DVDROM CDRW

[c_hegge]

Re: No brand psu 12v diode failed

Looks like an L&C. Glad to hear it's working!!!! What is it powering?

Looks nothing like one to me. If anything, it more closely resembles a CWT/ISO or possibly a Unitek (a small chinese company). It kind of resembles this, aside from the different heat sinks.

[Th3_uN1Qu3]

Re: No brand psu 12v diode failed

Agree, definitely not a Deer/L&C, their soldering usually looks horrible, and more often than not there's a wire beefing up the ground trace. This looks pretty clean, and has proper input filtering and a connector for a passive PFC coil.