First post, by Baoran
I have a 7 year old atx seasonic power supply that gives me sometimes strange readings when using multimeter to measure voltage. I always thought seasonic power supplies were good and 7 years would be nothing to them.
Basically only thing I have been able to replicate is that when the power supply has been without a power for a while (without power cable connected to it) when I connect the power cable and I turn it on I get voltages between 14V and 15V when measuring the 12V output using multimeter. It seems like the voltage reading gradually decreases after being turned on until it reaches about 12.17V and then the reading stays there stable. Main thing that in a bios that shows pc health status it shows 12V voltage to be around 12.05V during the whole time when my multimeter is showing voltages between 14V and 15V. Mostly the reading starts around 14.5V when a computer is first turned on after having power cable disconnected.
I have some questions.
1. Could this be normal behaviour from a power supply?
2. What could be wrong with the power supply that could cause this kind of behaviour if there is a problem with it?
3. Why would bios and multimeter readings be so different? If it is bios showing wrong readings, it makes me feel like using bios to try figure out when power supply is going bad is pointless.