[mythtvnz] Help troubleshooting signal interference

[Douglas Pearless]

Are you running near the limits of the power supply? (What size is it?  
If it only requires a 4 pin extra power plug for the motherboard, then I 
have a spare you could borrow to troubleshoot).

If you remove the extra sata drive, does this fix it?

Douglas.

Matt Poff wrote:
> Over the last couple of weeks my MythBox has developed some weird  
> signal interference which obliterates the picture feed to the TV.  
> There have been no electrical wiring changes in the house or new  
> appliances plugged in so it's a mystery. I unplugged every other  
> device from the mains running off the same dual socket except the TV  
> and Myth box and unplugged everything else (audio jack, DVB-S feeds  
> etc.) from the box but the interference persists even when the Myth  
> box is not running.  I even grabbed an extension cord and fed the TV  
> and Myth Box of completely different loops with no effect. Only when I  
> actually turn off the power switch at the back does the interference  
> stop.
>
> I opened the box up to check whether there were any loose cables etc  
> but couldn't find any. The only change I've made recently was adding  
> another SATA drive to the rig.
>
> I'm assuming the problem stems from the power supply but not sure how  
> to fix it? Do I need to ground the box in some way? It's a purpose- 
> built PVR case (Silverstone LC16M) so should be fit-for-purpose.
>
> The actual supply of power is fine and the system runs but the feed  
> out to the TV is borked. Turning the RCA jack  (good quality video  
> gold-plated) in the Video-In socket sometimes improves the picture  
> fleetingly. If the system is unplugged from the mains and left for 10  
> minutes or so the signal is usually OK on the next restart for half an  
> hour or so before the interference kicks in.
>
> Any ideas how to fix or further troubleshoot this?
>
> Cheers,
> Matt
>
>
>
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