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crt TV OSD channel

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frank

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Dec 24, 2017, 6:41:05 AM12/24/17
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Hi all,
wierd thing of the day: the channel number (OSD overlay) on an old
14" CRT TV is never disappearing. I've never encountered this behaviour,
so I'm a bit unsure where to start diagnosing.
The chassis is a Nokia Mono Plus, few ICs do everything.
On the other hand, the volume OSD bar disappears quickly after the last
volume button action.
Any hint?
Frank

Terry Schwartz

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Dec 24, 2017, 11:02:01 AM12/24/17
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It may be a setting. Check the settings in the menus.

frank

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Dec 24, 2017, 1:24:23 PM12/24/17
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Terry Schwartz <tschw...@aol.com> wrote:
>
> It may be a setting. Check the settings in the menus.

Menus in a 1980's TV? This is probably the first attempt at any kind of OSD.

Frank

Terry Schwartz

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Dec 24, 2017, 1:28:54 PM12/24/17
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> >
> > It may be a setting. Check the settings in the menus.
>
> Menus in a 1980's TV? This is probably the first attempt at any kind of OSD.
>
> Frank

I had a Toshiba of similar vintage, maybe just slightly newer, and it had menus.

Heathkit and some Zenith TV's from even earlier has some OSDs. Caller ID and station number.

Michael A Terrell

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Dec 24, 2017, 2:32:05 PM12/24/17
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Do you have a schematic, or a datasheet on that IC? I've had shorted
ceramic capacitors on the control lines which kept a function locked. In
another case the bad capacitor shorted the input voltage that controlled
the brightness.

Tim R

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Dec 26, 2017, 8:52:52 AM12/26/17
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I've had that happen on a CRT not quite that old.

It's really annoying. There was always some combination of inputs from the remote that fixed it, but sometimes it took us a couple weeks to hit on it again.
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