Why does hard reset often kills my image?

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Why does hard reset often kills my image?

Postby thorsten » Fri Oct 04 2019 08:48

Hi,

one thing that really annoys me for months is the "disapperance" of my raspberrys in case of a hard reset aka pulling the powerplug.

My last "experience": the setup gui didn't appear on one of my RPi 3B+ with Hifiberry Amp2. So, I pulled the power plug, waited 5 seconds and replug it. The result: nothing :x No sound, no connectivity via app, not visible on the wifi monitor of my fritzbox. Software is about 3 months old (around 2.57+).

This was the fourth time within the last couple of months! Not only with AMP2 (with its separate power supply of 19V), but also on normal ones with piggyback hifiberry DAC.

Any ideas?

Thorsten
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Why does hard reset often kills my image?

Postby michelangelo » Fri Oct 04 2019 09:18

Hi Thorsten,
in both cases, where does the PI take power from? The AMP and the DAC or it's self powered?

This is because, just yesterday we discovered something interesting.
Context: first corruption cause of SD card is when they are provided with less than 5V.

We noticed on a product that having a capacitor on the power line, when power is suddenly removed, it discharges quite slowly, keeping the PI powered with a voltage that decreases constantly until gets to 0 (and not getting to zero immediately). We believe that this design pattern will result in SD Card corruption a lot.

Let me know
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Why does hard reset often kills my image?

Postby PaulM » Mon Oct 07 2019 07:25

michelangelo wrote:We noticed on a product that having a capacitor on the power line, when power is suddenly removed, it discharges quite slowly, keeping the PI powered with a voltage that decreases constantly until gets to 0 (and not getting to zero immediately). We believe that this design pattern will result in SD Card corruption a lot.

Interesting observation, and also quite logical. Almost all wall wart (switching) power supplies use caps to smooth the output voltage. The more oversized the power supply, the longer it will need to drain - and generally we like our 3A power supplies on the Pi that draws ~250 mA. It will need a few seconds to drain. (To illustrate: I have a small circuitry that draws ~30 mA, powered by a 3A wall wart. It remains functional for more than a minute after unplugging.)

For this reason, when necessary I unplug the cable on the Pi's side to kill the power instantly. So far I have had very little issues with that.
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Why does hard reset often kills my image?

Postby thorsten » Sat Oct 12 2019 15:19

Hi,

this is an interesting idea.... I use an old Dell 19V-Power supply. The ones with Amp2 on top are powered by the Amp2. I will try to "fast shutdown" the power the next time the system itself is stugged. (hopefully this will not happen so early... :lol: ). Will keep you informed.
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