Corsair CX-600 photos

[rogfanther]

As promised, photos of the thing.

Got a bunch from a nighbour shop, asking if I could take a look on them.
Some even smelling of new.

After I searched the net and saw the horror stories of DOA units, then the RMA replacements failing also, etc, i got sad about corsair.

This one specifically has no 5VSB. Maybe I will play a little with it, but after reading about them, and taking a look, I have already explained them that even if I could discover what is wrong with them, and fix it, it would not be economically viable for them.

[c_hegge]

Re: Corsair CX-600 photos

Samxon GF

[ben7]

Re: Corsair CX-600 photos

Would be very interesting to find out why these are failing, even when brand new!

At least the caps are somewhat decent - not CapXon or Teapo!

I'm guessing there is a MOSFET that connects all the grounds togather when the PSU gets a signal to turn on.

Edit: And its got a temp sensor

[rogfanther]

Re: Corsair CX-600 photos

Could the problems be only because of the Samxon GF ? I will be testing the obvious parts and measuring voltages today. Any other place of interest you would suggest measuring ?

[ben7]

Re: Corsair CX-600 photos

Could the problems be only because of the Samxon GF ? I will be testing the obvious parts and measuring voltages today. Any other place of interest you would suggest measuring ?

Start out by testing the main cap and see if it has nearly 300VDC on it.

[kc8adu]

Re: Corsair CX-600 photos

i have already seen these with the gf's blown.they have to go.but thats not whats keeping it down.the 2 i fixed had very bad soldering.

[rogfanther]

Re: Corsair CX-600 photos

Well, I can dissect it, at least for science´s advancement.

[Behemot]

Re: Corsair CX-600 photos

GFs are only one bad series from Samxon I think. It's like Chemi-Cons KZG, very usefull for manufacturers and their „warranty engineering“.

[rogfanther]

Re: Corsair CX-600 photos

It shows 173V in the big cap ( voltage here is 127VAC ) . From the automatic 110/220 switching, I believe this psu to have some kind of active pfc. In that case, shouldn´t the voltages in the cap measure about 270 - 300V ? It is a Samxon LP 270uF x 400V, btw.

[tom66]

Re: Corsair CX-600 photos

About 390-400V when running. If there is no 5V stby, that is where to start, as that powers the PFC.

[everell]

Re: Corsair CX-600 photos

If the 5vsb doesn't work, nothing else will work. By the way.......remember the Bestec ATX-250 12E mobo killer? The problem with it was..........bad 5vsb circuit!

[Behemot]

Re: Corsair CX-600 photos

Well, this time it at least does not kill motherboard. There is the difference between L&C and CWT

[c_hegge]

Re: Corsair CX-600 photos

^
CWT transistor based 5vsb circuits kill boards too. Remember the Antec StupidPowers?

[ben7]

Re: Corsair CX-600 photos

It shows 173V in the big cap ( voltage here is 127VAC ) . From the automatic 110/220 switching, I believe this psu to have some kind of active pfc. In that case, shouldn´t the voltages in the cap measure about 270 - 300V ? It is a Samxon LP 270uF x 400V, btw.

Try jumpering the green PS_ON wire to ground. then check the voltage on that cap.

[Behemot]

Re: Corsair CX-600 photos

^
CWT transistor based 5vsb circuits kill boards too. Remember the Antec StupidPowers?

Nope, haven't been watching it by the time they've been on market and now they are almost all dead so I probably won't get any in my hands ever…

[dmill89]

Re: Corsair CX-600 photos

Nope, haven't been watching it by the time they've been on market and now they are almost all dead so I probably won't get any in my hands ever…

I've got several that still work perfectly, of course the original fuhjyyu capacitors have all been replaced. These weren't bad PSUs with the exception of the caps. The 2 transistor 5vsb circuit is not the best of designs but was relatively common for the time and with good caps is generally not an issue.

[Behemot]

Re: Corsair CX-600 photos

I am not saying that. But here how many, up to 5 ppl in whole country were doing such things as recapping PSUs? Add that Antec was not so common here and what is the probability I will find any?

[rogfanther]

Re: Corsair CX-600 photos

Per Kc8adu´s advice, I will first ressolder all the primary, just to be sure that isn´t the problem. After, will need to the little board that seems to be in charge of the 5vsb transformer. That is so hidden between the other parts that will give a little trouble.

I will look in the other ones if I can find one to compare voltages....

[ben7]

Re: Corsair CX-600 photos

Per Kc8adu´s advice, I will first ressolder all the primary, just to be sure that isn´t the problem. After, will need to the little board that seems to be in charge of the 5vsb transformer. That is so hidden between the other parts that will give a little trouble.

I will look in the other ones if I can find one to compare voltages....

Isn't there no 5vsb transformer in this supply?

Check to see if the PWM control IC is getting power.

Also, when you jumper the PS_ON to ground, check to see if the big MOSFET on the secondary side heatsink turns on.

[rogfanther]

Re: Corsair CX-600 photos

Well, even after finding some open resistors around the 5vbs circuito, no dice.

I removed the little board with the 5VSB controller, and sure it is toast. Could not decide if it has 5 or 6 legs. There is a hole for one, but it disappeared.

The marking in the chip is K1P, but that led just to diodes, in a different encapsulation.

The other psu that I was using as reference, has a ICE3BR465J, PDIP, in this board. The owner of the psus wants them back, and has already said that doesn´t want to pay much for the fix, so I will probably just call it quits and give them back to him.

My "reference" one has the 5VSB functioning, but just give a little twitch in the fan when trying to power on. The rectifiers don´t seem to be shorted. Tried with load ( 2 hard disks ) and without. Will replace the caps in the secondary with whatever I can find here, just as a scientific experiment.