[mythtv-users] HD-PVR power supply (wall wart) gone bad

Daryl McDonald darylangela at gmail.com
Sat Dec 1 13:26:25 UTC 2018

On Fri, Nov 30, 2018, 8:57 PM Bob <mythtv at cox.net wrote:

> On 11/8/18 2:14 PM, Will Dormann wrote:
> > On 11/8/18 10:39 AM, Dan Wilga wrote:
> >> I, and others, have
> >> successfully replaced these wall warts with a cable that connects
> >> directly to the PC's 5v power supply. I essentially took the Molex
> >> connector from a dead case fan, moved the "+" pin from the 12v position
> >> to 5v, chopped off the bad wall wart's cable, and wired it to the pins
> >> on the Molex connector. Remember: Polarity is crucial!
> >
> >
> > +1 on this strategy.  I've been running my HD-PVR off of my MythTV box's
> > DVR for a few years with zero trouble.   I just run the wire out of the
> > back of the MythTV box (via an expansion slot cover that has a hole in
> > it) and to the HD-PVR.
> >
> > Aside from being more reliable, one fewer wall wart is a neater setup!
> So, I made my attempt at a cable to replace my wall wart and my
> recordings are not working so good. After re-reading this, it appears I
> should *not* have used the 5V line even though the wall warts I have
> show 5V @ 2A, right?
> Interestingly, the HD-PVR does power-on and is assigned a device
> (/dev/video5 in this case). However, I attempted a 4 minute recording
> and actually recorded for about 1 second. The "blue" light turned off
> every 4 seconds, then back-on again.
> So, use the +12V line and not the +5V line?
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More than doubling the voltage is never a good idea, my guess would be not
enough amperage, I couldn't get reliable operation from internal power
supply to a HDHR so I now keep a supply of replacement walwarts on hand.

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