[mythtv-users] nvidia drivers - partial screen rotation?
mtv at aperature.org
Mon Nov 3 12:55:30 UTC 2008
On Fri, Oct 31, 2008 at 10:15 AM, R. G. Newbury <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.)
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
If the problem you have is minor, I wouldn't mess with it since it could be
more trouble than it's worth.
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