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Re-capping.

post #1 of 8
Thread Starter 
I have in my hands, a 325W Delta ATX PSU.
The issue with it is that it has two blown caps on the secondary.

When you plug in the power to the PSU, all it does is sit there and buzz loudly.

Won't boot up a PC, and PS_ON to GND does not even turn on the PSU.

Is this a failsafe protection feature on the PSU, and will re-capping guarantee that the PSU will work again?

Let's assume here that the caps are replaced with ones of identical voltage and capacitance value.
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post #2 of 8
Quote:
Originally Posted by Volvo View Post
I have in my hands, a 325W Delta ATX PSU.
The issue with it is that it has two blown caps on the secondary.

When you plug in the power to the PSU, all it does is sit there and buzz loudly.

Won't boot up a PC, and PS_ON to GND does not even turn on the PSU.
Some PSUs don't boot at all even there isn't a minimal load, so they can't be jump-started between the green and black wires.
Quote:
Is this a failsafe protection feature on the PSU, and will re-capping guarantee that the PSU will work again?
It won't guarantee the PSU will work, but without those filtering caps the signal is at best "dirty" and at worst completely polluted by parasitic frequencies. No wonder the PC doesn't start, and if it were my PC I wouldn't risk starting it with a non-filtered secondary as may other parts can get toasted.
Quote:
Let's assume here that the caps are replaced with ones of identical voltage and capacitance value.
Basically they have to be the same capacitance (or thereabouts) and the voltage must be at least equal to those that were previously.
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post #3 of 8
Thread Starter 
This is probably why the PC didn't start.

My apologies, forgot to add that the PSU was tested in another guy's rig.

He woke up one day to find his PC turned off, and the PSU just sat there buzzing and whining and wouldn't start.
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post #4 of 8
You need to get *all* the specs right, including ESR (important for effective filtering). Voltage and ripple ratings can be higher.
post #5 of 8
Thread Starter 
Okay.

Let me crack it open, then I'll provide you guys with more info about it.
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post #6 of 8
try changing the capacitors. I had a HEC Zephyr 750w about a year ago. I did not do the repair myself but a repair shop here did it. he changed the 2-3 capacitors if memory serves me right and fixed the problem totally. I'm still using it on my other rig at the present
post #7 of 8
Why bother? For the time, effort, and money, you could just get a low-cost replacement.
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post #8 of 8
Thread Starter 
Can't find many low-watt PSU's in Singapore.
Our distributor only carries the Seasonic S12 II 380B, and that costs $89. For $95, we can buy the SS-500ET, which is overkill for a HTPC that only has a Sempron 140 LE, M4A78L-M LE with a HD4550 and 1 DVD-RW drive, with a WD Caviar Blue 160GB HDD.

The other spares I have are a 4-year old FSP 250W, and 5-year old HIPRO 300W.
This one is quite new (2 years old) and I'm hoping a complete re-cap can render it useful.
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2x KVR1333D3N9/2G Plextor M5S 128GB Western Digital Caviar GreenPower WD5000AACS Western Digital Caviar WD2500JS 
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LiteON iHAS324 DVD-RW DL Thermaltake Water 2.0 Pro w/ AVC DS12025B12U Windows 7 Home Premium x64 Dell Ultrasharp U2211H 
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