Cheap PSU: Piece of junk or semi-decent?

[goodpsusearch]

Re: Cheap PSU: Piece of junk or semi-decent?

ΝΟΟΟΟ

[momaka]

Re: Cheap PSU: Piece of junk or semi-decent?

Heh heh I'm thinking about performing a little experiment ... what if I just cut off the shorted leg and put it back as a single-diode 20A rectifier ? Would it start?

It *might* start with no load, but definitely something I would NOT try with a load. Will probably get terrible ripple on the 12V rail... if you can even call it a 12V rail - it might be closer to 6V than 12.

As for the blow rectifier, check the snubber network for the 12V rail. Should be a ceramic cap and a low-resistance resistor (10 Ohms for Deers, IIRC) in series. Sometimes the ceramic caps go shorted on these Deers and cook the resistor. If the resistor goes O/C, you have no snubber network, and the voltage spikes from the transformer could get high enough to take out the rectifiers.

[ben7]

Re: Cheap PSU: Piece of junk or semi-decent?

It *might* start with no load, but definitely something I would NOT try with a load. Will probably get terrible ripple on the 12V rail... if you can even call it a 12V rail - it might be closer to 6V than 12.

My guess is the transformer might easily become saturated then, unless the other rails are loaded down sufficiently. (Even then, the transformer would saturate at a lower current, so the psu might not be able to do it's rated output without going bang)
(If it would even cause it to saturate at all ... it's just a wild guess! lol XD)

-Ben

[TELVM]

Re: Cheap PSU: Piece of junk or semi-decent?

My guess is the transformer might easily become saturated then, unless the other rails are loaded down sufficiently. (Even then, the transformer would saturate at a lower current, so the psu might not be able to do it's rated output without going bang) ...

^ Hum, you may have a point there, the main transformer always looked suspiciously small from the beginning.

After discovering that one of the main switchers was also damaged, I decided to decomission the concoction . Tinkering with it was tons of fun and a learning experience, and most amazingly it lasted for 2~3 years in its frankenstein iteration.


It's caps have been recycled and found a new home onboard an Enermax ENP500AGT that came OEM with an assortment of Jun Fu and Su'scon crap.

[momaka]

Re: Cheap PSU: Piece of junk or semi-decent?

After discovering that one of the main switchers was also damaged, I decided to decomission the concoction .

I guess its time has come.
RIP TooQ

Tinkering with it was tons of fun and a learning experience, and most amazingly it lasted for 2~3 years in its frankenstein iteration.

It also prompted lots of good discussion in this thread .
I think the Deer would have lasted longer, though .

It's caps have been recycled and found a new home onboard an Enermax ENP500AGT that came OEM with an assortment of Jun Fu and Su'scon crap.

Nice!
Reusing and re-purposing is the highest form of recycling.

[TELVM]

Re: Cheap PSU: Piece of junk or semi-decent?

... I think the Deer would have lasted longer, though ...

That one is still soldiering on and running fine, Oh Deer!

[momaka]

Re: Cheap PSU: Piece of junk or semi-decent?

Not surprised. Them Deers are tough cookies.