[mythtv-users] nvidia drivers - partial screen rotation?

[Brian Wood]

Darrin wrote:
> 
> 
> On Fri, Oct 31, 2008 at 10:15 AM, R. G. Newbury <newbury at mandamus.org
> <mailto:newbury at mandamus.org>> wrote:
> 
> 
>     Tube type TV's sometimes have a rotation adjustment setting, but this
>     may be inside and thus a 'tech-export' type of repair. You might try
>     googling for a repair manual.
> 
>     The other choice is to just open the case, ease the tube restraints, and
>     just rotate the tube. This was quite easy on tv's built many years ago.
>     I remember my father doing it. He ended up wedging a folded up match
>     package cover under a bottom corner. If you go this route, just remember
>     to have the tv ON, and just pull the plug, so as to *attempt* to drain
>     the capacitors before poking and prodding inside. (IIRC my father first
>     attempted to rotate the yoke on the neck of the tube but it was fixed or
>     glued in place.)
> 
>     Geoff
> 
> 
> It's been a few years since I played around with that, but what Geoff
> says is correct.  There's a circular set of electromagnets on the back
> of the tube called a yoke that can sometimes be rotated to get the
> picture to align with the screen. 
> 
> There are a couple of things to bear in mind first.  One is high
> voltages that are present in a television set, so I would not recommend
> trying to rotate the yoke with the set turned on.  I'd rotate it a
> little, turn it on and see what it looks like, turn it off, and repeat
> as necessary to get it to look right.
> 
> The other thing to think about is color alignment.  In some cases,
> changing the orientation of the yoke can cause the red, blue, and green
> guns to go slightly out of alignment - particularly in the corners of
> the screen.  Re-adjusting the alignment is pretty tricky if you don't
> have a repair manual for your specific set and a video generator to give
> the tv an alignment grid. 

This is "convergence" amd, as you said, can be a bear to get right.
Moving the yoke will also effect the purity, and essentially a complete
re-alignment might be needed after touching the deflection yoke.

> 
> If the problem you have is minor, I wouldn't mess with it since it could
> be more trouble than it's worth.

I agree what that notion.

beww