[mythtv-users] HDHomerun tuner

Craig Treleaven ctreleaven at cogeco.ca
Thu Nov 21 19:00:34 UTC 2013


At 6:29 PM +0000 11/21/13, Gary Buhrmaster wrote:
>On Thu, Nov 21, 2013 at 6:12 PM, Craig Treleaven <ctreleaven at cogeco.ca> wrote:
>>  At 6:02 PM +0000 11/21/13, Gary Buhrmaster wrote:
>>>
>>>  However, the other possibility is that your power supply
>>>  is going bad.  The HDHRs are known to have power
>>>  supplies that go bad,
>>
>>
>>  Assuming one has a cheap digital multimeter, how, exactly, would one
>>  ascertain that the power supply was good or marginal?  Under voltage? Low
>>  amerage?  Missing magic smoke?  ...  ;)
>
>If the PS is the SW20-S050-15, it is so well
>known to be faulty, you just presume it is
>(SiliconDust used to send out replacements
>just by opening a ticket 5 or more years ago;
>I have no idea regarding their current policies
>for such old devices).
>
>The problem is (often) voltage ripple (a common
>fault with these POS power supplies is the caps
>go bad).  While better equipment can measure
>ripple directly, most cheap DVMs can measure
>it by setting the display to AC voltage.  Note that
>you can only do the measurement while the PS
>is under load.  I do not know the specs on the
>HDHR, but more than about 50mv is probably
>suspicious.
>
>In 95%(*) of the cases, it is just easier to test
>by replacing the PS and see if it improves
>things.
>
>Gary
>
>(*) Made up statistic.

Thanks.  The original power supply on one of my HDHR's was replaced 
in that program.  I'm not experiencing any problems and I'm not going 
to crack them open just to test...

Craig


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