I have converted two ATX PC power supplies to 12V bench power. They have worked flawlessly for the past 5 years. Suddenly, both are providing 17V+. What could be causing this? I have a 10ohm resister connected between the 5V and ground. Should I put this on the 12V as well? The 5V rail produces the most current as they are both old power supplies.
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1\$\begingroup\$ Are you sure that resistor is still good? A 10 Ohm resistor on 5V dissipates 2.5 Watts, that's much more than a standard resistor can handle. \$\endgroup\$– PMFCommented Sep 23, 2022 at 16:03
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1\$\begingroup\$ Have you measured them in the past and found 12V at no-load? \$\endgroup\$– virCommented Sep 23, 2022 at 16:07
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\$\begingroup\$ Just tried a new resistor....no change. Also measured the voltage in the past no load and it was around 14v \$\endgroup\$– shaggy_sb5Commented Sep 23, 2022 at 17:27
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2\$\begingroup\$ If your multimeter measures 17V on both supplies, change multimeter batteries. \$\endgroup\$– JustmeCommented Sep 23, 2022 at 17:27
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\$\begingroup\$ what do the other outputs measure? \$\endgroup\$– jsotolaCommented Sep 23, 2022 at 18:08
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