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From: mm on 7 Apr 2010 23:59
On Tue, 6 Apr 2010 15:32:43 -0700 (PDT), whit3rd <whit3rd(a)gmail.com>
wrote:

>On Apr 6, 12:30�pm, mm <NOPSAMmm2...(a)bigfoot.com> wrote:
>> Question 1: On a tv screen, what is the opposite of pin-cushioning
>> called?
>
>Barrel distortion. For the obvious reason...
>There may be a 'pin amp' or 'pincushion' marked control that you can
>tweak (but this would be a remove-the-case-back kind of job).

Thanks. I'll look if I ever take the back off this one.
>
>> Question 2: I have a 12 inch Sony color tv, with turret tuning and a
>> separate UHF turret tuner, with detents. �I guess it's about 25 years
>> old.
>>
>> I've been using it for about 2 months and, mayb surprisingly, the
>> opposite of pin-cushioning (OPC) doesn't bother me. I only notice it
>> rarely, when there are some vertical lines near the edges of the
>> screen, or at the end of a movie when the credits crawl by.
>>
>> A couple days ago, within a day or less, two vertical lines appeared,
>> about 1.5 inches from the left edge, about a quarter inch from each
>> other, each about 2 or 3 mm. wide, the right one from the top of the
>> screen to the bottom, the left one from the top of the screen 9/10ths
>> of the way to the bottom, sometimes only to 2/3rds. �The lines flare
>> out at the top and bottom, I presume because of OPC.
>
>That's usually where 'ghosting' shows up; there's a strong timing
>signal
>on analog TV just to the left of the picture, and if you have a
>delayed ghost
>of the timing signal, there will be a (usually dark) bar in that
>position.
>Ghosting has this symptom ONLY on analog transmissions, though.
>Is your set on analog cable?

Well, no it's not on analog cable but it's on analog output from the
DVDR with OTA reception. Is one different from the other?
>
>A second possibility is that the 'screen' adjustment is out of whack
>(this usually lowers the contrast on the full display); if you have a
>gray-bars test pattern (some DVDs come with such on 'em) it will fail

No my Philips DVDR with harddrive has a lot of good features, but it's
missing a lot of features also.

I do have a dot generator in the basement, but i'll never get around
to this. Like I said, I just wanted to know how it could happen.

Thanks

>to have a good 'black' until the screen is readjusted. Screen
>readjust
>is very commonly required with age, and either an insulated
>screwdriver
>into the marked hole, or a remove-the-back-and-tweak adjustment is
>likely to be available.
>
>> I don't have much expectation of fixing this, but I would like to know
>> what it is, how it can happen.

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