[mythtv-users] Emergency video debug

[Mike Carron]

On 01/30/2015 08:05 PM, Michael Watson wrote:
> On 31/01/2015 11:51 AM, Nick Rout wrote:
>> On Fri, Jan 30, 2015 at 12:49 PM, Ian Evans <dheianevans at gmail.com> 
>> wrote:
>>> On Thu, Jan 29, 2015 at 9:23 PM, Nick Rout <nick.rout at gmail.com> wrote:
>>>> Have you tried real simple stuff like unplugging and replugging the 
>>>> hdmi
>>>> cable?
>>>>
>>>>
>>> Relative was over watching a Blu-ray with the missus, so I didn't 
>>> have a
>>> chance due to the location of the box. When I was finally able to, 
>>> luckily
>>> the box came back. Just curious, how does that happen? Neither the 
>>> TV nor
>>> the mythbox had been moved. And I did multiple reboots. So what in the
>>> physical act of re-plugging makes the change? Is it something like a
>>> transient electrical blip causing the issue and then the reconnecting
>>> handshake fixing it?
>>>
>>> Thanks to everyone for all the ideas.
>> I really don't know why it worked, I just remember it working for me.
>>
>> Had a similar thing with a network cable last night.
>>
> It is to do with the small currents used in digital equipment. The 
> current going through the cable/connections is not enough to keep the 
> contacts "clean" or penetrate the oxidation that has built up. By 
> unplugging and plugging back in, the contacts get cleaned.
>
> At least, thats what an old radio tech told me.
***
That old radio tech knew what he was saying.

mike