Worth saving ? analyze this psu for me please

[Gabriel]

Ok, this is for Dell laptops - sold by MicroBattery, was surprised when I open it and saw cb.

Is this worth saving ? 3.34A really ?

Build quality seems low for me,both screws looks used, thin wires and dirty cb with what looks like dry flux.

Tell me what you think and please give comments based on pictures.

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Rest of the pictures.

[mockingbird]

Re: Worth saving ? analyze this psu for me please

Absolute junk, and check out that counterfeit input primary cap. Toss it in the rubbish bin.

[shovenose]

Re: Worth saving ? analyze this psu for me please

Shit as mb said.

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Holy crap, we must have a hundred of these at work. Just found this in the garbage bin and decided to take a look inside.

I always thought MicroBattery was quality stuff !

[goontron]

Re: Worth saving ? analyze this psu for me please

oh god! burn it! its absolute junk.

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Ok, would you please explain why this is junk.

Tell me what is good & what is not so good.

[kaboom]

Re: Worth saving ? analyze this psu for me please

Ok, would you please explain why this is junk.

Tell me what is good

Absolutely nothing.

& what is not so good.

Everything.




For starters, the fact that this underrated junk pile is sold under "circumstances" alleging it's "equivalence" to the genuine PS is reason enough.

Undersized wiring
Undersized traces
Questionable isolation- looks like line side traces are a little close to the secondary
Cans of shit that "look like" caps
Nichicon VYs haven't been made for years, so the input cap is basically an "F-you"
Components with long leads, etc.

And most obviously, the board is too small for the case, indicating they were trying to "get rid of" their junk in something else...

[Gabriel]

Re: Worth saving ? analyze this psu for me please

You are giving me the impression that you might not like what you see hehe - the sticker on the housing is actually quite good, I still have glue on my fingers.

'underrated junk pile' - how to calculate this rating ?

[kaboom]

Re: Worth saving ? analyze this psu for me please

'underrated junk pile' - how to calculate this rating ?

Easy. "Crank it 'till it pops!"

[Pentium4]

Re: Worth saving ? analyze this psu for me please

Who knows if those caps are even low ESR. On Fullcap's datasheet it says they are, but in the specs they only list dimensions! No impedance or ripple current info... And the soldering on that thing is horrid

[kaboom]

Re: Worth saving ? analyze this psu for me please

Who knows if those caps are even low ESR. On Fullcap's datasheet it says they are, but in the specs they only list dimensions! No impedance or ripple current info... And the soldering on that thing is horrid

To even trust such datasheets is like trusting ASUS stuff, without redundancy, on the space shuttle!



For me, "funny caps" simply count as "missing components" from the board.

[Pentium4]

Re: Worth saving ? analyze this psu for me please

To even trust such datasheets is like trusting ASUS stuff, without redundancy, on the space shuttle!



For me, "funny caps" simply count as "missing components" from the board.

Might as well just install jumper wire!

[mockingbird]

Re: Worth saving ? analyze this psu for me please

I'm sure someone smarter than us on this forum could give a thorough explanation, but off the top of my head, the brick has insufficient input protection, and what input protection exists is undersized. The output circuits are underdeveloped and insufficient. The capacitors are sorely lacking and probably don't even meet their stated spec.

I should also point out that the circuit board is not filling the entire case for a reason - they use the same PCB on all their adapters and simply mold different sized cases for different laptop models in order to "match" - at least visually - the original adapter.

These adapters are actual fire hazards, and I have personally seen one after it had been severely burned.

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Easy. "Crank it 'till it pops!"

Don't know how to, have a few multimeters,esr meter and a dso but is far far away from any knowledge on things like this.




Ok, had to measure these caps and try to start it up - was surprised that it managed to power my old inspiron.

With my oem Dell 90W powersupply bios reports 90W psu used, with this MicroBattery psu bios reports psu is a 150W model

Had to take a close up of the output section - lovely soldering job.

[Pentium4]

Re: Worth saving ? analyze this psu for me please

Wow, impressed with the Fullcap specs, at least they are low ESR. How much use has this thing seen?

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Impossible to tell,found it in the garbage bin at work.

[shovenose]

Re: Worth saving ? analyze this psu for me please

With my oem Dell 90W powersupply bios reports 90W psu used, with this MicroBattery psu bios reports psu is a 150W model

Perhaps they meant 15W??

[Gabriel]

Re: Worth saving ? analyze this psu for me please

Getting hot running p95.

[goontron]

Re: Worth saving ? analyze this psu for me please

its going to be a hell of a snap when it fails