Seasonic Focus Plus 650 Gold (SSR-650FX) make PC restart especially when higher load

[ary89]

i need help for this PSU, it is old way back to 2018, bought it, but after 2 years, with Ryzen 3 3100 and RTX 2060, it sometimes make the PC reboot when gaming(RTX 2060 full load), it used on ITX Silverstone SUGO SG11 case, so probably got heat often, i don't have schematics and boardview, any help please, where to start looking? well it just feel bad to see good things damaged like this

(few months ago, i try to power i9 14900K+RTX 4060 with this, and it restarted while install Windows, and corrupt the SSD)

[stj]

i'm pretty sure the focus range has a 10 year warranty - i know the focus GX does.

[ary89]

yes sir, but in 2021 I already try to clean inside of it, the warranty seal already broken

[CapLeaker]

Isn’t windows supposed to restart during install?
corrupted the SSD how?

[stj]

https://seasonic.com/focus-plus-gold/
try them

[ary89]

CapLeaker, it just reboot, while on process, in the past while in gaming also sudden reboot, just like it lose power for a second.

so basically it is start normally, 12v rail slight higher to 12,3 vdc(from other review it should be 12,05-12,1v, at max full load should be 12,02-12,05v,
so if schematics and boardview exist would be better for me to check it

[CapLeaker]

And what are your power ok and PSon pins doing? If the power supply loses power the power ok lets the main board know to stop writing. That was done more for the old HDD to keep the heads up. Point is: your SSD should be recoverable if it just written and the power went away even if I forget about the power ok pin. There is nothing spinning inside.

This is going to be a tough nut to crack with a DMM alone, unless it has a cold solder joint somewhere. Freeze spray and hot air is your friend. You’d have to monitor the supervisor and a bunch of other things at the same time. I suppose you could deactivate the fault protection and see if she behaves,

don’t worry about the 12V output being 12.3V that is within tolerance.

[ary89]

the SSD is fine, just reformated and reinstall windows with different PSU.
the PSU lose power, just like turn off it switches and power it on in a second, so PC start reboot/POST again.

i just remembered this may cause my old Radeon RX560 GPU to fail with this PSU.

so basically this PSU is fine as long not loaded high enough.

yesterday I resolder(remove chips, clean, and resolder with low temp solder) all its chips(APFC Controller, Resonant Controller and Supervisor IC), now 12v rail only 11,9v, i think there are problem in those IC's. oh and I measure main filter cap, it only have 415-420 micro farad, it rated for 440 micro farad/400v

[CapLeaker]

You have to figure out if the PSU looses power (I doubt that) or if the supervisor IC detects something and shuts the power supply down (protection). That’s what I think is going on.

Then why is it doing that. Is it a voltage rail going into over current protection (the PSU is able to produce up to 710w for short period), or an unstable voltage.

It’s easy to disable the fault protection and see if the restart stops. I posted the supervisor spec sheet earlier. All you need to do first is monitor that fault protection for starters. Then you need an oscilloscope and see what happens to the voltage rails and why it is acting up.

Caps have a tolerance of plus or minus 10% so your main filter cap should be all right.

[stj]

if you have one, try another cap.
APFC circuits beatthehell outofthemand you can usea tester to check the ripple capacity in amps

[Agent24]

Got any photos of this?
Does it have the "evil brown glue" all over it, causing corrosion somewhere like the control circuits?

[ary89]

Agent24 under every ICs there are brown hard glue. BTW i tried to replace those all main IC, all three of it, with my friend's focus fx650, now it stable, i returned the IC to the owner and order new online, the problem is, those ic not always in stock so need time pre order from china with ali express. with good IC it can stable even to load i5 12600K + RX6800 gaming for few hours, and 12v rail is stable at around 12,1v

[Agent24]

If it's glue under SMD ICs it's probably not the bad one. The bad glue is used to secure large parts usually, primary capacitors, transformers, etc. The good manufacturers use silicone glue.

The bad ones use nasty brown or black stuff that goes corrosive. This has been known for decades but it's still in use... clearly planned obsolescence.