crt TV OSD channel
 

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

crt TV OSD channel
 

On Sunday, December 24, 2017 at 5:41:05 AM UTC-6, frank wrote:
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

It may be a setting. Check the settings in the menus.

crt TV OSD channel
 

Terry Schwartz 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

crt TV OSD channel
 

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.

crt TV OSD channel
 

frank wrote:
Terry Schwartz 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


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.

crt TV OSD channel
 

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.