[linux-dvb] Re: card broken?

[christophackermann@t-online.de (Christoph Ackermann)]

Hello Guido,

ist a little bit off topic to your problem, but i think i should explain my expieriences to this group.
I had also a strange behaviour with my DVB-s Cards. About two months ago, i observed distortions on the screen and i thought that it must be from a misaligned dish, caused by heavy storms in the winter. Now i checked the dish (alignment was perfect), cables, connectors; all was in top condition. Then i observed a thermal behaviour. After coldstart (5 mins off) the picture was ok, but after a few minutes, distortions came back. I checked the heat sink on tuner chip -> ok. I placed a cooling fan on top of the cards -> distortions stay. 
The reason was:
I set up my box with a faster cpu (K6-2/550 than K6-266) for watching DVD and my power supply runs sligthly into current limitation and +12V- decrease about 1-2V. Yes, DVB-s card generates 14/18V for LNB from this voltage for switching/amplifying. I use the same case like Klaus Schmidinger - You can see it on Klaus' Homepage. This case contains only 200W power supply !

I hope this may prevent unnecessary work in power supply related errors with DVB-s cards in the future.

 Christoph 

On Thu, 11 Apr 2002 20:35:17 +0200
Guido Fiala <gfiala@s.netic.de> wrote:

> > We had that once with a card that got too hot. After switching off the
> > computer for a while it worked again. We had to use a fan to cool it,
> > so that it wouldn't happen again.
> > If it doesn't work after a cooling down period there is probably
> > something wrong with the tuner :(. Sorry, but I guess that  short of
> > replacing the tuner, there won't be any easy solution.
> >
> > Marcus
> 
> Thanks for your and others help so far.
> Strange things are going on:
> 
> In the meantime i got an replacement card (new one) and it shows the same 
> problem!
> I assume my dish is perfectly aligned because the analog signal looks pretty 
> good and it can show all channels.
> At the pass through _some_ channels show perfect quality on analog receiver.
> Can it be, that my LNB is just that much broken that it wont support digital 
> anymore?
> At the time of the breakdown i did nothing to the delicate parts of the 
> system, so i can't imagine a software problem but if it were what could it be?
> 
> Well, ever wanted to have a 2 card system, so it won't be a waste of money if 
> the first card is still working, but somehow i have to get it working again 
> first ...
> 
> 
> -- 
> Info:
> To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.
> 


-- 
"... and all the hippies work for IBM or take control ..."
Joe Jackson - Big World, 1987


-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.