Power Supply FSP FSP500-30AS Modular Flex PSU from GEEEK, anyone have one?

[vinnyoflegend]

That's awesome man! Would you be open to making a guide for modding this? I'm very interested in using this amazing flex psu for my upcoming build whilst practicing my soldering skills.

There's not much to it. @dukedevil0 nailed it in his post where the source of the 5v rail was deduced. See https://smallformfactor.net/forum/t...-from-geeek-anyone-have-one.19238/post-284388

I soldered two salvaged cables (atx female pin already crimped) to the spot circled in blue to get the 5v rail. I found it was easiest to snake the cut ends of the two cables underneath the small board and bend them back so they could lay flatter once soldered. I also put a piece of kapton tape over the solder joint as an extra precaution since the cover would be pressing on it slightly (though the cover is painted and also has a plastic flap).

The rest of the cables I de-pinned from the 10-pin connector (3.3v x 2, 12v x 2, gnd x 4, PS-ON, and 5VSB). Combined with the 2x 5v cables. I originally tested them directly in an ATX 20pin connector (omitting one 12v rail) as seen in one of the pictures but settled on rearranging an extension cable as a 12-pin to ATX 24-pin (see https://smallformfactor.net/forum/threads/reducing-wiring-of-the-24-pin-connector.19321/post-285413)

I did notice one oddity since running this full time and on some test systems, sleep did not work for me on two Intel systems (one Asus Z97 with 4790k, another Asus Z790 with a 12700k. I think it may be the lack of PWR-OK/PWR-GOOD but I haven't had time to test further (such as trying to supply 5V on that pin). Sleep did work fine on an MSI B550 with Ryzen 7 5700G. On my Intel systems, instead of sleeping, it seemed like it would try to sleep but then would reboot (and then wake from sleep). I did confirm that both Intel systems could sleep fine with other PSUs I had available with full pins but for all I know it could be an Asus vs MSI quirk. I have a couple of other systems I could try it on but they're coincidentally also Asus with Intel, and MSI with AMD.

Fortunately I don't use sleep anyways, I always leave my systems running 24/7. But perhaps @milesvw has another take on it since he also excluded the Power Good pin but added all the other pins he could try sleep on some systems. If that works, then I wonder what the spec for sleep is looking for...

 

[Potato6456]

The rest of the cables I de-pinned from the 10-pin connector (3.3v x 2, 12v x 2, gnd x 4, PS-ON, and 5VSB). Combined with the 2x 5v cables. I originally tested them directly in an ATX 20pin connector (omitting one 12v rail)

Hi @vinnyoflegend , I am new to SFFPC building but not PC building and followed this guide to make this PSU work, however after de and repinning all the necessary wires as well as the soldering, my pc unfortunately doesnt turn on. I use a Asus B550M board for testing and all that happened was the motherboard lights came on. Do you have any idea what is going wrong here? I would really appreciate the feedback. (If you would rather reply on discord, my discord is potato6456, and i am on the sffpc network discord.)

Thanks in advance for whatever insight you can give me

 

[vinnyoflegend]

Hi @vinnyoflegend , I am new to SFFPC building but not PC building and followed this guide to make this PSU work, however after de and repinning all the necessary wires as well as the soldering, my pc unfortunately doesnt turn on. I use a Asus B550M board for testing and all that happened was the motherboard lights came on. Do you have any idea what is going wrong here? I would really appreciate the feedback. (If you would rather reply on discord, my discord is potato6456, and i am on the sffpc network discord.)

Thanks in advance for whatever insight you can give me

Can you share some photos of what connectors you're using? And have you measured each pin to ensure it's correct and that the PSU is staying on when you short PS-ON and a ground pin? Are you still supplying/connecting the 8p CPU/EPS connector to your motherboard?

I found it helpful to mark the pins in my connector against another diagram, you can also write in your confirmed multimeter reading for the voltage rails

For example
Using this for reference https://www.moddiy.com/product_images/c/652/power_atx_socket_pin_number__40404_zoom.jpg

Here's my connector which was an old ATX 20pin

Regarding your particular motherboard, it's possible it is wanting to sense Power Good or a voltage on a particular pin. For PWR good, you could try moving one of the 5v lines you created with soldering. For the other case, you can try moving the line/pin (i.e. I populated only 2 of 4 3.3v pins, I would try moving one of mine to the 2nd row).

Another way to rule out the connector positioning is to take a known good power supply with 24 pins and depin to match your custom one (be sure to tape off or insulate the wire/pins if you've got them in the air so they don't short against each other) and see if it's able to power on your board.

 

[Potato6456]

PS-ON and a ground pin?

Cannot believe i forgot about this. going to try this on friday! i think that may be the root of the issue!

For PWR good, you could try moving one of the 5v lines you created with soldering

I tried that but didnt work. I see now why it didnt haha

by the way - would i need to short PSON and ground once or everytime for boot? or just the first time? never had to do something like this before... would it be okay to permanently short them?
Thank you so much for the insight!
Will also send pics tmrw. very excited for this build - my case (taobao m24itx) should be arriving within the next week or so.

 

[vinnyoflegend]

Cannot believe i forgot about this. going to try this on friday! i think that may be the root of the issue!


I tried that but didnt work. I see now why it didnt haha

by the way - would i need to short PSON and ground once or everytime for boot? or just the first time? never had to do something like this before... would it be okay to permanently short them?
Thank you so much for the insight!
Will also send pics tmrw. very excited for this build - my case (taobao m24itx) should be arriving within the next week or so.

If you're testing the PSU separately, you would short it and leave it shorted. Otherwise, if you're plugging it into your motherboard, it needs to be in the correct position on your ATX 20/24 pin connector and would be shorted when you press your power button or short the power switch pins if you haven't connected a power switch to those pins (the front header pins)

 

[Potato6456]

If you're testing the PSU separately, you would short it and leave it shorted

Tried this - psu fan spins, and all voltages seem fine - 3.31V 5.22V 12.31V (on multimeter) checked my pin layout compared to yours as well and everything matches up. I am very confused about why it wont turn on. Im now trying it with my board im going to be using in the build and it wont turn on either (with other PSU it will still work)

 

[vinnyoflegend]

Tried this - psu fan spins, and all voltages seem fine - 3.31V 5.22V 12.31V (on multimeter) checked my pin layout compared to yours as well and everything matches up. I am very confused about why it wont turn on. Im now trying it with my board im going to be using in the build and it wont turn on either (with other PSU it will still work)

Just to confirm, you’re still connecting the 8pin cpu power cable as well to your motherboard right?

 

[Potato6456]

Just to confirm, you’re still connecting the 8pin cpu power cable as well to your motherboard right?

yessir, connecting everything required to boot

 

[Potato6456]

Just to confirm, you’re still connecting the 8pin cpu power cable as well to your motherboard right?

Here are some photos linked -

 

[Potato6456]

Ok 3rd update - removed pins on my EVGA 400W psu so its the same config and it works ,,,
I think I somehow broke the FSP power supply which really sucks

 

[vinnyoflegend]

Ok 3rd update - removed pins on my EVGA 400W psu so its the same config and it works ,,,
I think I somehow broke the FSP power supply which really sucks

When you're doing the detached test with the FSP power supply, does it stay on while the PS-ON/GND is shorted or does it turn off after a time? I'm not sure of the quality of 5v soldering there, hard to tell from the pictures. Did you also use salvaged psu wires or did you crimp your own?

The pins on the ATX connector mostly look fine as well, but verify they're all a good square shape. If any are out of shape it may not be making good contact when plugged in (i.e. part of it could actually get bent/flattened by the male pin on the motherboard side).

 

[Potato6456]

When you're doing the detached test with the FSP power supply, does it stay on while the PS-ON/GND is shorted or does it turn off after a time?

It stays on for as long as its plugged in/shorted

quality of 5v soldering there, hard to tell from the pictures

Should theoretically be okay, its really on there. cant move the wires at all until the rubber part. I also get a solid 5.2V when taking multimeter.

Did you also use salvaged psu wires or did you crimp your own?

I used salvaged PSU wires yea

part of it could actually get bent/flattened by the male pin on the motherboard side).

Very much worth a shot, will try sometime this week.