How To - Build the PRS-Tech SNES-Zero

Various user-contributed guides for hardware-related things
Kory
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Re: How To - Build the PRS-Tech SNES-Zero

Post by Kory » Sun Jun 24, 2018 12:33 am

I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?

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YaYa
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Re: How To - Build the PRS-Tech SNES-Zero

Post by YaYa » Sun Jun 24, 2018 1:03 am

Kory wrote:
Sun Jun 24, 2018 12:33 am
I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?
You may suffer lack of power... try with directly powering via micro usb from a wall plug. If the problem disappear, then the problem is either your HDMI cable or the TV.
The test with another TV that can deliver power trough HDMI, if it works, the problem is the other TV not giving enough power.

Kory
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Joined: Sun Jun 24, 2018 12:30 am

Re: How To - Build the PRS-Tech SNES-Zero

Post by Kory » Sun Jun 24, 2018 1:36 am

YaYa wrote:
Sun Jun 24, 2018 1:03 am
Kory wrote:
Sun Jun 24, 2018 12:33 am
I am having issues where the raspberry pi is powered by the HDMI for varying lengths of time before randomly rebooting. Does anyone have a solution for this?
You may suffer lack of power... try with directly powering via micro usb from a wall plug. If the problem disappear, then the problem is either your HDMI cable or the TV.
The test with another TV that can deliver power trough HDMI, if it works, the problem is the other TV not giving enough power.
So I tested the parts and it does appear to be my HDMI cable. To fix this do I just get a shorter cable?

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Brownie
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Re: How To - Build the PRS-Tech SNES-Zero

Post by Brownie » Tue Sep 25, 2018 6:15 pm

rafters wrote:
Thu Oct 26, 2017 8:38 am
RhinoNigel wrote:
Fri Oct 20, 2017 2:18 pm
Ahhh good eye.
The best I could tell was that OPs voltage inserted isolates the TV-end HDMI power pin and only sends power back toward the Pi. According to OP this causes issues with some smart TVs so he adds the diode as a jumped to add power to the TV-end pin too. The diode prevents power going back toward the USB end but I can't imagine a scenario where this would happen.

The cheaper voltage inserter I linked above doesn't isolate the TV-end power pin (so power is sent both ways down the HDMI cable) and therefore doesn't need to be modified (unless there is some reason for the diode over a jumper that I'm not aware of - in which case the explanation from those above is inadequate due to the way the pad works, you'd need to detach the red wire and put the diode between the wire and the pad).
What I gather from this conversation is that is the HDMI USB Power adapter referenced here does not need any modification and no diode is required. Does that sound right?

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