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

[Allen Edwards]

Don't use the +12 line.  It will likely destroy the unit. I am very
surprised that the internal +5 supply in a PC ran out of current.  I could
understand that if you got the +5 from a USB cable but not from one of the
molex cables.  Maybe the wire is too small or you actually hooked up
something wrong.  Get a voltmeter and check what is on the wires when you
are recording.

Allen

On Sat, Dec 1, 2018 at 5:27 AM Daryl McDonald <darylangela at gmail.com> wrote:

>
>
> 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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