Power supply problems.
#1
I use an at to DC in to power my board. now the other day I unplugged my power unit everything was switched off before I did and such. when i plugged it back in my amprage was significantly lower my VSB wire is usually 3A at 5V now it's reading .25A at 5V and the 12V wires are all reading 1A roughly and I was wondering if any one has encountered this problem before.

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#2
(04-25-2018, 01:34 AM)larsen8989 Wrote: I use an at to DC in to power my board. now the other day I unplugged my power unit everything was switched off before I did and such. when i plugged it back in my amprage was significantly lower my VSB wire is usually 3A at 5V now it's reading .25A at 5V and the 12V wires are all reading 1A roughly and I was wondering if any one has encountered this problem before.

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at to DC in?

Do you mean a ATX computer power supply? Amperage being low isn't a problem as that is simply the amount of work being done, but you do have a problem if the voltage (pressure) is low, as it either means the power supply is overloaded (unlikely since you say the amperage is low) or the power supply is faulty (also unlikely if the voltage is low).

If you meant 0.25V on the 5v line, and 1.0V on the 12v line, then it sounds like you need to load up the power supply or instruct it to actually turn on, as ATX power supplies are not meant for light duty loads, or to 'just turn on'.
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#3
Your completely right and I have the PS-on wire set to turn on the power supply and it will power through DC in pins just fine but if I hook a 5v wire to a microusb and ground wire that's where the problems have been starting.

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#4
(04-26-2018, 07:58 PM)larsen8989 Wrote: Your completely right and I have the PS-on wire set to turn on the power supply and it will power through DC in pins just fine but if I hook a 5v wire to a microusb and ground wire that's where the problems have been starting.

Ah, good, at least we're talking about the same sort of PSU! Wink

Hm... so the 5v V_STB (pin 9 - standby) isn't coming on? AFAIK, the V_STB line should active all the time the PSU is connected to the mains power, regardless of if you have pulled PS_ON to GND to turn the main supply on. That would suggest there is an actual fault with the power supply. If it's the main 5v and 12v rails, then I would be suggesting you still need to look at a minimum load on either the 5v or the 3.3v power rails... 

That's pretty much all I can think of at the moment. As far as powering via the pins or the microUSB, get the power supply outputing the correct voltages first before fiddling with the connection to the pine64. Then you can double check if the connection to the microUSB is ok. (i.e. Use a multimeter when the power supply is turned off, and do a continuity test between the GND pin on the header and the GND coming from the power supply, and then do the same for the 5v. If you don't have continuity, the power supply is NOT the problem, as with the microUSB connected properly to the PSU, there should be continuity).
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#5
No the vsb comes on just fine but only at .25A then if I hook the ps on to ground and power up the whole all 5v rails only put out .25A and I've done this with 2 separate units and I'm not sure where I'm going wrong.

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I should also point out as long as powering through Euler it works fine but on my pi and the micro USB on pine with an adapter to the PSU they won't boot.

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#6
(04-27-2018, 12:32 AM)larsen8989 Wrote: No the vsb comes on just fine but only at .25A then if I hook the ps on to ground and power up the whole all 5v rails only put out .25A and I've done this with 2 separate units and I'm not sure where I'm going wrong.

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I should also point out as long as powering through Euler it works fine but on my pi and the micro USB on pine with an adapter to the PSU they won't boot.

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ATX power supply designs for high power and some ATX power supply may not turn on or no function properly if the loading is too light.
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