The PSU functions optimally in cold conditions but fails to activate in warmer temperatures.
The PSU functions optimally in cold conditions but fails to activate in warmer temperatures.
Hello everyone.
I own an old Seasonic G-750 SSR-750RM from 2016, still used in my vintage rig.
The power supply only activates when the system is cold and rested. It can run for days without issues—stressing it doesn’t cause any problems. However, if I turn it off and attempt to restart it immediately, it just stops working. The same happens with sleep mode; it won’t wake up.
I’ve identified the problem as being related to the power supply unit. When I swap it into my current system, it functions perfectly, and vice versa. The old rig works fine with the new PSU.
Another observation: if I let the unit rest for about an hour or two after it’s been running, it turns on again. But if I try to power it up while it’s still warm, it needs half a day or more to recover and refuses to start if I wait just an hour. Each failed attempt increases the time required for the PSU to function properly.
I’m planning to use a multimeter to diagnose the issue and replace the unit. I hope someone here has faced this situation before and can guide me effectively. So far, I haven’t found any information about this kind of failure, so it might be uncommon.
Thanks in advance.
Yeah, PSU's generally function or they don't, which is a bit unusual in your situation. I've seen car radios behave similarly; they work until you turn off the vehicle, then restart after about ten minutes, but still fail until nightfall. I own an old 500watt Seasonic SS-500ET that always powers up when turned on, but its 12v rail is around 10v, dropping to about 8v under light loads and eventually causing system failure. I don't know what to look for in your case.
My main thought is the solder was poor quality. It used to be a common issue when installing certain AMD/ATI GPUs, especially after they got very hot. I'm not sure if it's still happening, but the signs are quite alike.
If it is so unusual for it to begin behaving oddly more than six years after purchase...especially with graphics cards, the heat gun trick usually helped my old GTX 770 a year ago and it still functions today, almost ten years later. I plan to bring the PSU to an electrician next week in hopes they can locate the issue.
Good luck and keep an eye on the situation. I haven’t come across any reports about PSU experiencing this issue, but heat buildup seems like the most likely cause.
I'll consider it when the situation arises. At this stage, my curiosity is strong, and I'll provide an update on the cause for those who want to know.
He won't bill for the inspection, only for fixing it. I know him.
But since there's no universe in which it makes sense to pay for a repair at the price of an electrician, you're literally wasting his time. It's like going to the ER for a hangnail. Just because I might get seen by my sister doesn't make it any less a waste of time.