Dell HU300PM-01 (Huntkey) blown and damaged

[goodpsusearch]

Dell went downhill choosing Huntkey, a known bad psu manufacturer as an OEM.
https://www.badcaps.net/forum/attach...1&d=1400339914


I don't know what led to that result..
Just look at those pics:
https://www.badcaps.net/forum/attach...1&d=1400339914
https://www.badcaps.net/forum/attach...1&d=1400339914
https://www.badcaps.net/forum/attach...1&d=1400339914
The 5vsb IC has been blown in 2 pieces and one diode has been cut by itself
https://www.badcaps.net/forum/attach...1&d=1400339914
https://www.badcaps.net/forum/attach...1&d=1400339914
https://www.badcaps.net/forum/attach...1&d=1400339914

All the caps were tested and found ok. In fact, about the primary capacitors HEC 680uF 220WV, their actual capacity is 920uF!

The destroyed MOV indicates that the psu might have been hit by a power surge or maybe someone chose the wrong voltage in the voltage selector switch.

Otherwise the psu isn't bad.
-passive pfc. The first I see that is not covered with insulator material, you can actually see the copper turns:
https://www.badcaps.net/forum/attach...1&d=1400339914

-UC3843B PWM controller
-1x W10NK80Z N channel mosfet in a single forward topology
-1x STPS2045CT for 3.3V
-1x STPS3045CT for 5V
-1x STPS30H100CT for 12V

-Voltage comparators AS339P and AS393P for UVP and OVP
-ST9S313 for OPP & SCP & OVP & UVP, cannot find datasheet.

Is it worth repairing? I have read that Huntkey power supplies are not greatly designed.

[Wester547]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Hmm... is that really a genuine Dell power supply? A google search doesn't reveal much about it and that Dell logo doesn't look genuine. Someone else once said here that Dell used Huntkey but I didn't want to believe it. I guess it's true. Huntkey aren't the worst power supplies and now adays they are honestly rated and much better, and that unit is at least single forward instead of half bridge. The fact that the HEC capacitors read outside their -+20% tolerance means they could be bad. I think it's worth repairing and recapping (FCON capacitors... yuck) - Huntkey units do tend to have good voltage regulation and ripple suppression most of the time. Looks like it's a genuine dual +12V unit too since I see one gold colored shunt for the +12V rail and there should be another. Not sure if I like the fact that the passive PFC isn't covered in insulating tape, though. To tell you the truth, it looks like Dell chose a "peak rated" 400W model that can really output 300W continuously.

[ron350]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Goodpsusearch do you know what model Dell computer this came out of.?

[ben7]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Hm, I think it looks fake too.
At least, I am accustomed to the all caps 'DELL' logo, not 'Dell'.
Never seen the logo like on this one.

Anyways, at least is isn't a Deer!
I mean, they ever have input EMI filtering!!!

[c_hegge]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

That is a genuine Dell PSU. All new Dell PSU's I've seen use that logo (and yes, some are made by Huntkey). I wouldn't say that huntkey as necessarily a bad manufacturer. They will do what you tell them to, much like CWT. If you ask them for a junk PSU, that's what you'll get, but they can build a decent unit if you're willing to pay for it.

[stj]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

a lot of newer dell psu's are junk.

what do you extect from a company that charges through the nose,
and yet gets it's computers assembled using prison labour!

[goodpsusearch]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Goodpsusearch do you know what model Dell computer this came out of.?

No, unfortunately..

[stj]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

a chinese site says it's for "DELL Inspiron 660 MT"

[momaka]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

All the caps were tested and found ok. In fact, about the primary capacitors HEC 680uF 220WV, their actual capacity is 920uF!

Be careful. An ESR meter may show the ESR is okay, but this much of a high capacitance indicates probable high internal leakage. If it's outside of the 20% tolerance, I don't trust it.

Since the MOVs were destroyed, I would guess either the voltage selector switch was put on the wrong setting or a lightning strike hit the PSU.

Is it worth repairing? I have read that Huntkey power supplies are not greatly designed.

Looks like a fairly decent PSU. That 30A on the 12V rail should be good for about 22A. The small output inductor might put a limitation on that, though. But other than that, if you have the necessary parts available, then give it a try. I think it should do 300W in spec just fine. Probably more than enough for a basic or mid-end PC. I see a shunt for OCP, too. That's good.

[goodpsusearch]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Hmm

I got very lucky and got many psus from the recycling of the university. This psu is not going to be repaired atm but I am very willing to experiment with those primary capacitors

I bet they are ok!

[goodpsusearch]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

Goodpsusearch do you know what model Dell computer this came out of.?

dell vostro 270

[goodpsusearch]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

I replaced the cut and shorted P6KE200A diode and the blown TNY277PN, checked every nearby diode, resistor etc and removed the blown MOV.

I connected it to AC with the lamp in series trick. The lamp lighted for a second and 5vsb came up without any problem.

But when I connected green to ground the lamp lighted again for a second and then there were 2 explosions and some burnt silicon smell.

This time some smd burnt on PCB. Maybe the main mosfet, marked with blue in the picture, was faulty after all (I tested it and didn't find it shorted..) or the main transformer that had serious burn damage from the initial blowing of the TNY277PN had been affected.

Anyway, this psu is going to be used for parts.

[momaka]

Re: Dell HU300PM-01 (Huntkey) blown and damaged

That's a shame the PSU blew again. Looked decent otherwise. But blown SMD transistors are a pain to hunt and replace. I find it interesting that even with the light bulb trick, some SMD components still blew up. Maybe this PSU really was messed up badly.