Hello
Anyone has schematic for this?
Thank you

what's a problem? It it possible to solve it without schematic if you have a brain.

Hello i have short after the 400v rectifier. It is hard to remove components like hell to see what is causing it

It is very easy to understand where the short circuit is. Just check MOSFET D-G, D-S terminals. Than desolder 3 legs with desoldering pump and check other Mosfet and 2 diods + bridge. And no schematic needed for this.

This PSU not for beginners.

True is hard. I found already one all 0 i have another one but i can't get out. It is no space te remove the screw. I have 2 Ipa50r140cp mosfet complete short on all 3 pins. Any easy to find mosfet to replace them?

aliexpress helps you
You must check all small things around legs of Ipa50r140cp

Ali takes 2 months now to get items
There are some smd resistors around

resistors, capacitors, npn pnp transistors, PMW APFC controller, electrilitic capacitors around controller,
Stand by power supply. Check big capacitor
find datasheet of PMW APFC controller, check Vcc, may be other pins too acording datasheet.
Seems You have LLC resonant half-bridge topology, try to find in google pdf "LCC ATX PSU", seems onsemi had pdf with circuit.
https://www.onsemi.com/pub/Collateral/TND359-D.PDF

The supply is few moths old max 1 year. The Gpu made short and in 1 month psu died

1 month after GPU collision PSU die? right? there are no interconnection.
In transistor rectifying disain commonly break secondary transistors, but You have short in primary. so You must check all small SMD elements in primary

Ok i will do

Hello until now i found this:
One diode and 2 mosfet dead all pins in short. See photo



The schematic is approximate
So i should check their driver no?

I didn't found other components with problems. What i can do? Replace those 3 and try... or any test i can do not to damage more the psu? Im new at thia thank you for helping me
Pfc ic =ICE3PCS01G
Other controller ICE2HS01G

ICE3PCS01G
ICE2HS01G


Bridge is ok?
Is the short on the outpun terminals? 12/5/3.3/-12

Drivers to these Power Moset's is ok or not?
Standby PSU is ok or not? ( need to replace diod first and mosfets you've found before)

Bridge ok
No short on any output voltage from atx24
How to check driver? No short on gate (on pcb) of those 2 faulty mosfet after removing them from pcb.
I don't have this types of mosfet. I will search for similar but i do not know if it is a good idea to replace them with other types.

If i replace diode and power up the psu with no mosfets do i risk to damage anything? Maybe i can measure some signals with oscilloscope on the gate pin? Or the controller will not send them because at startup it not sensing any feedback?
The mosfet gates are powered by some small transformer with 2 secondary coils for 2 mosfet. The primary coil come from controller board.

in few days i will get those 2 dead mosfets and diode (dead=all 3 pins in short)
any advice what to check before power up the psu?
1 standby voltage after cable connection and no booooom ?
2?


driver for this mosfets is strange
controller board has main chip and some 8pin operational amplifier on it and from this boards is going by a transformer to mosfet gates
Something like this:



I checked all small value resistors no fault found
I checked all diodea and transistors no fault found
No capacitor în short on controller board
Also in primary side of psu i checked all diodes and resistors and transistors

ilie321
first of all, your mistake is that you want help, but you do not share information about what IC's are, smd transistor are, no photo.

look at my posts

More info - more help, no info - no help, it's very simle.


use a 60-100W light bulb in series (instead of FUSE) to check standby PSU voltage.

If it's Ok, than use a 500-800W light bulb or an iron 1000-2000W or a hair dryer 1000-2000W insted and try to power on main PSU.
Do not load PSU more then 100W with light/iron/hd!/

quote="RsM"]ilie321
first of all, your mistake is that you want help, but you do not share information about what IC's are, smd transistor are, no photo.[/quote]
More photos:

Ok I put a 100w bulb instead of a fuse for testing. I replaced the bad mosfets ipa50r140 and diode. I have the 5v standby now. Any test I can do before I try to enable it? Or any info I could give you guys to help me?
Or I can pass to this? :

.
I have an 1000w air heater I will use that I think
It is enough to ground pwr_on for this power supply? Dumb question :)
Thank you

Try with 1000w air heater.

Not working. No voltage on outputs it stay 0 and it is making a strange intermitent coil noise 2-3 times per second. The air heater it is starting. I setup air heater for 750w. I have 1500w step on it also.
See here the noise:
https://drive.google.com/file/d/1-1VmVg ... p=drivesdk

Nothing blow. mosfets are OK thanks to air heater :). Should I change the controller? (2months maybe to wait for aliexpress)
I could check the pulses with oscilloscope on mosfets gates maybe.

---

Posted after 2 hours 38 minutes 34 seconds:
I have a B6 smd Q35 in secondary side that should be a transistor after Q marking (see picture) . On internet is a pnp but many devices same code. If I measure it as pnp is nok. Maybe a false direction but I don't know what to do.

B6 may be also - AS2304 N-ch mosfet )

Yes it is n channel mosfet and it is good I tested it.
Optocouplers also checked and ok. No short found anywhere at the moment
I measured with oscilloscope on gate of those 2 mosfets
Both transistors gets impulses for a split of second when the coil noise is present.
Any suggestions? Thanks

1)After you ground PS_ON measure the voltage at the input capacitors. So we find out whether the PFC section works or not. If it works, then the voltage will be 360-390V. Be careful
2) Check output for short! List there resistence 12, 5, 3.3, -12 to ground.

360-390 with that 750w air heater? It adds 70ohms in ac
I measured in standby 330v (with air heater as fuse)
With Ps_on at ground 330-360V but it varies much maybe because the source try to start every 0.3seconds
I edited last post both mosfets get impulses.

3.3V 13kohms+
5v 8k+
12v 7k+
-12v 9k+

try with this mode and now check input voltage.

350v stable for few seconds and like 3x more faster coil noises. Then I think something is overheating and voltage pass to 390v and like 1 noise at 2 seconds. After 3 - 4mins of cooling same 350v and fast noises. But with 1500w the voltage seams stable

So pfc seams OK?
I get like 5v on 12v rail when is doing this noise. Like - 5v on - 12v rail but 5v and 3.3v rest to 0V
But it is strange I can't see impulses on mosfet gates on secondary side for 12v . There are 4 mosfets to build 12v rail.

And dead end both mosfets died again and I never keep them up more than 3 - 4 seconds on 750w air heater
Now I will wait 2 months the new ones from Ali and new controller. In my country x10 price comparing with Ali. Sad so hard to diagnose switching psu.


What you think until now?any chance