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Please advice as I am a bit worried. Very expensive liquid cooled pc with rtx 4090 and Intel i9 cpu. Was starting yesterday when D5 pump got fried.as I replace the pump I wanted to properly test my psu. All voltages seem OK but pg is blinking and device beeps constantly. Is that a faulty psu? Pics and video here:
https://imgur.com/a/V8EUwC5
Also attaching a Pic here.
Hey everyone. Hope everyone is doing alright. So I currently just got a new GPU, I hooked everything up and the lights on my mobo would be on, but when I hit the switch pc doesn’t turn on. So I decided to use a power supply tester, and it read a “PG 160” while it was beeping, does that mean the power supply failed? Power supply is a EVGA 1000W G3 Super nova
Check your manual?
“PG 160”
PG = Power Good, the signal on pin 8 of the 24-pin ATX power connector for the motherboard: https://i.stack.imgur.com/XfJWS.jpg
I assume "160" means the Power_Good signal measures only 1.60 volts and that the maker of the tester was too cheap to include a decimal point. When a power supply is running, that signal should measure from about +3 volts to +5 volts. The power supply is supposed to contain circuitry to check that all the voltages are right and turn on the Power_Good signal if they are.
What are the readings for the +3.3V, +12V, +5Vstandby, and +5V lines? They should be within 5% of those values. There's a -12V line that's supposed to be accurate to 10%, but it's not important because modern motherboards (about anything made since the late 1990s) don't use it.
Power Supply Tester results: https://imgur.com/5Ol9bsI
Utilized a Power Supply Tester on my Apevia Prestige 800W PSU , and it keeps beeping, flashing the Power Good (PG) Value. The Power Good Value is either 160ms or 170ms, so this is a passing grade. A passing grade is 100ms -500ms.
Additionally, I used this PSU tester on 2 other power supplies, and there was no beeping.
On youtube, i found this dude's video: https://www.youtube.com/watch?v=IBj-R9tI71U and he got something similar when testing and says says " power supply tester started showing up with a PG (120) and that means power good and that was failing that test so basically means that it's been used way too much and so it's not recommended for regular use"
To add to this, this PSU is loud ASF. The d(B)a is 40 plus with no load. I contacted apevia and was told the following:
"We tested another Prestige PSU at our facility with a DBA website and the average DBA was 71.0, your DBA on your Prestige is normal.
We test multiple Power supplies every day and we use the same voltage tester on your video.
On your Power supply tester, everything looks healthy and is within PSU range. (power good (PG) signal on PSU tester within 100-500ms is healthy)
Your Power supply seems to have no issues."
The PSU seems to work find when utilized. Never had any issues with it and it hasn't been used in a while and was never run hard.
Obviously, the beeping means that there is an issue per instruction manual.
Anyone have some input on this?
TLDR: An apevia PSU when using the power supply tester keeps beeping flashing the Power Good (PG) Value. The value is in spec. What's the issue? Why the beeping?
Both your measurement and the tester may be correct.
And actually your numbers for pass criteria are a bit wrong.
T1 is specified less than 500ms.
T2 is specified more than 100ms and less than 500ms.
T4 is specified less than 10ms.
So reading the diagram you posted, the absolute minimum allowed time from driving PS_ON# low to PG high is 100ms like you say, but even T2 is defined 0.1ms to 20ms.
Then for slowest possible supply, the PG is allowed to stay low 1000ms before it starts rising, and then must have risen within 1010ms.
The rate how fast all the outputs are stable depends on if you start the PSU with no or full load resistively, or with no or full load capacitively.
The power supply tester may have resistors and capacitors as load. How you did your test is unknown, but I bet you did not apply the exact same load as the tester. Different loads produce different time between PS_ON# and PG.
Since you have the tester, you can use the oscilloscope to verify if the tester measures the time properly, by measurint PS_ON# and PG with scope and tester.
If you trust the scope, I would use that then a power supply tester which may not have good software especially if it is cheap. If you put in a known source into the scope (like 60 or 50Hz) you could verify your scope, but generally scopes keep time better than milliseconds.