Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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James Sweet
 
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Default What are extra dots on sides of picture tubes for?


"Keith Chandler" wrote in message
news:Yg5Bd.637759$%k.195260@pd7tw2no...
What are the extra pixels on the border (sides) of the picture tubes on
color TVs for (alignment?). The Sony TVs don't have these (because of the
Trinitron one-gun tube?)

Thanks,
Keith



Probably just extra phosphor material. The Trinitron tube has the phosphors
applied in a different way, vertical stripes rather than a matrix of
separate cells. The "one-gun" thing is just marketing hype, a Trinitron has
3 guns just like any other color TV tube.


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Art
 
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The cutout, dots, etc visible at the centre of the left and right sides
are generally a result of manufacturing the tube, they indicate the centre
of the edges, with respect to the viable raster area. Some Crts have what
looks like an notch, others, just a rounded divot.
These items are mentioned by the consumer when viewing the "black
surround" tubes, especially when asking a service technician why the picture
does not go fully to the mask excepting those two little bright spots on
each side. Of course the luminance level of the whole raster will determine
how bright these areas are, as with the rest of the picture.
"James Sweet" wrote in message
newsD8Bd.25914$h.14030@trnddc04...

"Keith Chandler" wrote in message
news:Yg5Bd.637759$%k.195260@pd7tw2no...
What are the extra pixels on the border (sides) of the picture tubes on
color TVs for (alignment?). The Sony TVs don't have these (because of the
Trinitron one-gun tube?)

Thanks,
Keith



Probably just extra phosphor material. The Trinitron tube has the
phosphors
applied in a different way, vertical stripes rather than a matrix of
separate cells. The "one-gun" thing is just marketing hype, a Trinitron
has
3 guns just like any other color TV tube.




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