PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

[cuonghvt55]

My PSU has strange sound and PG= 0 ms

If you've ever encountered such a case, please show me.
Any help would be appreciated.

[momaka]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

Could we see some pictures?
If it's built by Deer/Allied or some similar OEM, I'd suspect bad caps near the secondary-side controller/supervisor IC that generates the PG signal.

[Stefan Payne]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

That looks like the Solytech one...

[momaka]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

^ Yup, it's a Solytech.
If we can get the part number on the secondary-side IC/controller, that should help trace the PG signal.
Again, this being a Solytech, I'd suspect some of those small caps near the secondary-side controller (but probably a good idea to recap the whole PSU anyways.)

[cuonghvt55]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

OSC IC : UC 3844BN
OUTPUT: UF460L
The secondary-side IC/controller : GR8323N

[momaka]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

Looks like PG signal is handled completely by the GR8323N controller IC.

According to its datasheet, pin 1 (PGI) should be connected to two resistors and one cap (looking at your PSU pics, there may be 2 caps in parallel there, though.) Pull these components out and test them make sure they are good.

Next, pin 16 (PGO) is the output that directly connects to the gray PG wire on the PSU. According to the datasheet, there should only be a pull-up resistor and a cap to ground on this pin. Find these components on your PSU, remove them, and make sure they test good.

Post what you find when you do these two tests.

[cuonghvt55]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

PIN 1 is connected to 20K Ohm and 2.2K Ohm resistors, 2 caps 104.
I remove them and then replace with the new ones.

PIN 16 is connected to 1K Ohm resistor and cap 104.
I also replace with the new ones.

My PSU still has the sound "c..c..c..." and PG =0.

[sam_sam_sam]

Re: PSU Cooler Master RS-500-PCAR-N1 , PG = 0ms

https://html.alldatasheet.com/html-p...9/GR8323N.html

Look at page 8 at the bottom half of the page

Here is how I would go about troubleshooting this problem

( Have you recap this switching power supply especially any capacitor that has a UF value below 100uf )

The current sensor resistors —> I would put a volt meter across the current sensor resistor 3 volt, 5 volt and across the 12 volt and see what voltage you have across each one ( this assuming that you do not have very much of a load on any rail ) and see if one of those rail has more voltage than any other one if so which rail and why or you might have a faulty ic chip

Because from what I read about this chip and if I am understanding correctly it says that if the current is over 20 amps then the chip controller would turn off PG pin and be in a fault condition