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<blockquote data-quote="Foxi4" data-source="post: 8900663" data-attributes="member: 203855"><p>I understand the problem a little bit better now - your power supply is unable to keep a stable supply on the lines. There's a number of faults that would render a PSU unstable - it could be faulty capacitors, faulty voltage regulator, some kind of transistor, there's a lot that can go wrong on a supply like this.</p><p></p><p><a href="https://www.psdevwiki.com/ps3/Regulators" target="_blank">https://www.psdevwiki.com/ps3/Regulators</a></p><p></p><p>There's a lot of different regulators in circulation, and to top it off, without closely examining the supply you have no idea what the fault is - this normally isn't something you can fix by tweaking a screw. What's the model number of your specific supply?</p><p></p><p>The "screws" you're referring to are two potentiometers that used to be found on older PSU boards, they regulate the voltage on the 5V and 12V line of the supply. Modern supplies don't need them - the voltage is already set by the voltage regulator which regulates switching as needed, it doesn't need to be tuned like this. Turning them on the old boards would allow a little bit more power to pass through and meet demand by raising the voltage slightly, but it is, and always was, putting a band-aid on a hole in the ship - there's usually a different problem with the board that actually caused the fault in the first place and without probing the lines you'd have no idea how far past the safe limit you are.</p><p></p><p>To be honest, this is a part directly connected to mains voltage, with some beefy capacitors to boot. If you don't know what you're doing, you shouldn't be messing with it and you should replace the whole supply unit - save yourself some time. What you're doing carries a risk of death or injury if you're not familiar with electronics. I know it's not an answer you wanted to hear, but it's safer this way.</p></blockquote><p></p>
[QUOTE="Foxi4, post: 8900663, member: 203855"] I understand the problem a little bit better now - your power supply is unable to keep a stable supply on the lines. There's a number of faults that would render a PSU unstable - it could be faulty capacitors, faulty voltage regulator, some kind of transistor, there's a lot that can go wrong on a supply like this. [URL]https://www.psdevwiki.com/ps3/Regulators[/URL] There's a lot of different regulators in circulation, and to top it off, without closely examining the supply you have no idea what the fault is - this normally isn't something you can fix by tweaking a screw. What's the model number of your specific supply? The "screws" you're referring to are two potentiometers that used to be found on older PSU boards, they regulate the voltage on the 5V and 12V line of the supply. Modern supplies don't need them - the voltage is already set by the voltage regulator which regulates switching as needed, it doesn't need to be tuned like this. Turning them on the old boards would allow a little bit more power to pass through and meet demand by raising the voltage slightly, but it is, and always was, putting a band-aid on a hole in the ship - there's usually a different problem with the board that actually caused the fault in the first place and without probing the lines you'd have no idea how far past the safe limit you are. To be honest, this is a part directly connected to mains voltage, with some beefy capacitors to boot. If you don't know what you're doing, you shouldn't be messing with it and you should replace the whole supply unit - save yourself some time. What you're doing carries a risk of death or injury if you're not familiar with electronics. I know it's not an answer you wanted to hear, but it's safer this way. [/QUOTE]
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