SATA /PATA external supply ?

[bianchi77]

Guys,

Anyone knows about this SATA/PATA external supply ?
I suspect 4N60 FET burn....
Fuse blown, I've change it, is it possible if the small transistor frequency generator broken as well ?

Photo :


cheers

[goontron]

Re: SATA /PATA external supply ?

Those things don't fix.... They are dangerous when working, and would need a complete redesign to be fixed. However, they do make for a great learning experience because they are so simple. Look for bad solder, they are known for it. We need to see the bottom of the board. The switcher does look cooked, as well as the resistor in-between the cap and the MOSFET.

But for the sake of your self, your computers, and your data, don't use it once you've fixed it. You're better off with an older computer PSU.

[zx8401]

Re: SATA /PATA external supply ?

Here is a diagram that might help.

[bianchi77]

Re: SATA /PATA external supply ?

the switcher is a pair of 9014 and 9015, FET 4N60, are they all burned ?
Yea, I want to fix it but not for HDD, I'll use it for something else...

@zx8401....tx for the schematic

[bianchi77]

Re: SATA /PATA external supply ?

ok, I'll show you guys, the bottom one, it's terrible PCB...I need to fix it....

What's the value in circuit between E (emitter) and C (collector) of 9014 and 9015 when I test with multimeter ?

FET is definitly burned....

[bianchi77]

Re: SATA /PATA external supply ?

How do you reckon ?
Are they the broken ones ?

[kaboom]

Re: SATA /PATA external supply ?

lose the "earth" symbols for the returns in the primary side

those do not connect to the EGC, but to the floating common of the input cap


doesn't matter anyway, cheep stuff is a latent hazard- see how there's no EGC bond to the secondary common? when that cheep, poorly insulated transformer shorts between windings, [i]you or your computer (and ext. HDD) become the return path


http://www.businessinsider.com/a-gen...-for-10-2013-8
https://www.youtube.com/watch?v=wi-b9k-0KfE

the above are power supplies just as much as the ones for the ext. HDD adapters- you better believe that same pertains to all of them

OP, I'd smash that shock hazard (or worse, your line voltage is 240V to gnd) you have now... not even worth it- the only reason you have it is because it's something that "sneaked in" or was "dumped."

Goontron, as long as this cheep shit exists, we're gonna have "these kind" of posts...

[bianchi77]

Re: SATA /PATA external supply ?

those do not connect to the EGC, but to the floating common of the input cap

What is EGC??

[eccerr0r]

Re: SATA /PATA external supply ?

What about those psus that only has a 2-prong plug, the low wattage units still can get UL listed without any problems, or are people proposing every SMPS require a 3-prong plug?

[Electronic Handyman]

Re: SATA /PATA external supply ?

Check those 1N4007 there are 4 of those they usually go along with the fuse and mosfet but from your pic the resistor by the cap looks burned too.

[kaboom]

Re: SATA /PATA external supply ?

What about those psus that only has a 2-prong plug, the low wattage units still can get UL listed without any problems, or are people proposing every SMPS require a 3-prong plug?

There's a big difference between properly insulated two-wire SMPSes and the fake ones, that either have no EGC or have a "third wire" but don't connect it to secondary common. Leaving your computer/phone/whatever floating; should there be a fault from pri-sec, that "low voltage" device floats at line voltage...

As myself and others have repeatedly brought this up and clarified it ad nauseum, this will be the last time for me.

I'm done with this- anyone fooling themselves into thinking "it won't happen to me' really need to understand the principles at play; look into the fake iphone charger incident for starters, then put it all together and realize how that EGC protects you by providing "an effective fault-clearing path."

[stj]

Re: SATA /PATA external supply ?

just go to some used electrical markets / boot fairs and look for an old external scsi-case or external scsi / parallel-port cd drive.

they had very high quality 5v/12v psu's in the back of them.

[bianchi77]

Re: SATA /PATA external supply ?

Check those 1N4007 there are 4 of those they usually go along with the fuse and mosfet but from your pic the resistor by the cap looks burned too.

Which resistor?

[bianchi77]

Re: SATA /PATA external supply ?

Can I do like this to fix the ground ?


but it looks like there's no ground on the transformer....so
can I put ground to negative side ?

[bianchi77]

Re: SATA /PATA external supply ?

Can I connect negative side to ground straight away ? for safety,
without connecting to transformer ?

Thanks

[bianchi77]

Re: SATA /PATA external supply ?

see photo please,

[bianchi77]

Re: SATA /PATA external supply ?

do you guys have the schematic for this one ?
it's using FET 4N60

[zx8401]

Re: SATA /PATA external supply ?

Here is another schematic, this basic 12v and 5v supply is copyed by many.

[bianchi77]

Re: SATA /PATA external supply ?

Thanks for the schematic,
it's working now...but I don't have 0.22 ohm /1W....
temporaly I change to 22 ohm / 2W.....It gives me a lower DC voltage output...
I'll change to to the proper one later on....waiting another month

[bianchi77]

Re: SATA /PATA external supply ?

I put 0.15 ohm /5W on R1 and it gives me a short (bulb turns on very bright)
now I use 22 ohm /2W....it's working normally (no short ) but output only 1.1V and 2.1V

My rectifier diode forward voltage are only 0.1V.....I reckon, they're all broken...
Any suggestions ?