Use the chassis of a TV set (without picture tube) as a video souce

[John]

I have a 5 years old RCA tv that required a new picture tube just
after de warranty had expired and the price for the installation of a
new tube was ridiculous. It was a good lemon but it was a lemon.
I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).
If I power the set without the picture tube and yoke load, will it
give nothing but sparks?
Then what do you suggest that I should disconnect in order to use it
as I mentioned.
I have the service manual some where and if I get some encouragement
from you, I will look for it.
Thanks in advance.
John

 

[ian field]

I have a 5 years old RCA tv that required a new picture tube just
after de warranty had expired and the price for the installation of a
new tube was ridiculous. It was a good lemon but it was a lemon.
I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).
If I power the set without the picture tube and yoke load, will it
give nothing but sparks?
Then what do you suggest that I should disconnect in order to use it
as I mentioned.
I have the service manual some where and if I get some encouragement
from you, I will look for it.
Thanks in advance.
John

The line scan coils are part of the tuned resonant circuit so if you remove
them it will overload the PSU. Removing the CRT leaves you with a free
hanging EHT lead at 25kV and you can't remove the EHT transformer because
certain windings supply feedback for the sync separator.

 

[Jamie]

I have a 5 years old RCA tv that required a new picture tube just
after de warranty had expired and the price for the installation of a
new tube was ridiculous. It was a good lemon but it was a lemon.
I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).
If I power the set without the picture tube and yoke load, will it
give nothing but sparks?
Then what do you suggest that I should disconnect in order to use it
as I mentioned.
I have the service manual some where and if I get some encouragement
from you, I will look for it.
Thanks in advance.
John

I really don't think that is a good idea.
The HV in the system is an integral part of not only supplying HV,
but, supplying other signals required for various processes like Low
voltage sources, signal references to monitor sync etc..

 

[James Sweet]

I have a 5 years old RCA tv that required a new picture tube just
after de warranty had expired and the price for the installation of a
new tube was ridiculous. It was a good lemon but it was a lemon.
I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).
If I power the set without the picture tube and yoke load, will it
give nothing but sparks?
Then what do you suggest that I should disconnect in order to use it
as I mentioned.
I have the service manual some where and if I get some encouragement
from you, I will look for it.
Thanks in advance.
John

What on earth would you get out of doing this? Just junk it.

 

[Homer J Simpson]

I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).

You can get all of the free VCRs you want. Use them.


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[Arfa Daily]

The line scan coils are part of the tuned resonant circuit so if you
remove them it will overload the PSU. Removing the CRT leaves you with a
free hanging EHT lead at 25kV and you can't remove the EHT transformer
because certain windings supply feedback for the sync separator.

Not to mention several other LT rails, which may or may not be used in the
signal stages, and probably a pulse that's used by the colour decoder. On
some FBT's, the EHT lead is removable. If that set is one of them, you may
be able to remove it and fill the plastic tube that's left behind, with
silicone rubber to stop the lightning flying out of it, but as Ian says, the
scan yoke is an integral part of the circuit, and would have to be left
connected.

Arfa

 

[John]

You can get all of the free VCRs you want. Use them.

Thanks to all of you.
I am going to use the old VCR idea.
John

 

[PeterD]

What on earth would you get out of doing this? Just junk it.

Especially when an old mechanically dead VCR will do exactly what the
OP wants! <bg>

 

[Arfa Daily]

Thanks to all of you.
I am going to use the old VCR idea.
John

However, I thought that the whole point of asking the question, was so that
you would be able to make use of the TV set's features, such as PiP. You
won't find too many VCR's laying around that can do that ...

Arfa

 

[ian field]

Especially when an old mechanically dead VCR will do exactly what the
OP wants! <bg>

Don't they have DVB-T set top boxes where the OP is?

In the UK a basic freeview decoder price has plunged to about £25, I
recently bought a freeview DVR with 160Gb hard drive (80 hours recording)
with dual tuner and PIP for £99. Well worth the money to watch one programme
while recording something on another channel.

 

[John]

However, I thought that the whole point of asking the question, was so that
you would be able to make use of the TV set's features, such as PiP. You
won't find too many VCR's laying around that can do that ...

Arfa

Correct. I have one , JVC S8000 U that has that, may be I can
use it. It's an old but excelente machine that can also use S tapes .
I don't know if those tapes are available today


John

 

[Paul Feaker]

I have a 5 years old RCA tv that required a new picture tube just
after de warranty had expired and the price for the installation of a
new tube was ridiculous. It was a good lemon but it was a lemon.
I would like to use the set as one more video source to drive an
external monitor ( it has pic on pic).
If I power the set without the picture tube and yoke load, will it
give nothing but sparks?
Then what do you suggest that I should disconnect in order to use it
as I mentioned.
I have the service manual some where and if I get some encouragement
from you, I will look for it.
Thanks in advance.
John

Why would you need to take out the picture tube to use it like described?

Couldn't you just do what you plan on doing with the picture tube intact?

 

[Sofie]

Why bother with the size and inconvenience..... use a mechanically
challenged scrap VCR for the purpose.
It is smaller, uses less power and is in a nice contained cabinet.
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - -

 

[Brittany Martin]

Why bother with the size and inconvenience..... use a mechanically
challenged scrap VCR for the purpose.
It is smaller, uses less power and is in a nice contained cabinet.
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - -

Hey sofa, instead of a VCR, why not use a DVD player so you can watch
this DVD I have.

they show a fat boy screaming and crying while he's being beaten with
a baton.

 

[Michael A. Terrell]

Why bother with the size and inconvenience..... use a mechanically
challenged scrap VCR for the purpose.
It is smaller, uses less power and is in a nice contained cabinet.
Daniel Sofie
Electronics Supply & Repair
- - - - - - - - -

I like the old, separate TV tuners for the early portable VCRs. I've
converted two or three already. Basically, you remove the large cable
with that plugs in in place of the camera. Find the audio and video,
and mount a couple connectors on a plate to cover the hole where the
old cable was removed. Takes me 10-15 minutes to convert one. I left
one at a TV station as a spare off air demod. The video engineer like
it better than the $20,000 Tektronics system because it was a closer
match to what a typical home TV saw when it was fed to his monitors. He
used the Tektronics for quality measurements, but my converted equipment
for live shows.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida

 

[Malissa Baldwin]

Hey sofa, instead of a VCR, why not use a DVD player so you can watch
this DVD I have.

they show a fat boy screaming and crying while he's being beaten with
a baton.

No, he's already watching the DVD of you butt ass naked with a bucket
of KFC.

 

[Sofie]

Michael:
Yes.... the 2pc VCR units were a good candidate to permanently separate.....
I did many like you did, and in addition, separated the VCR, added 12 V
power and A/V connectors so that it could be used without the turner and AC
power supply..... many customers used them for their RVs and trailers.
Most of these 2pc units, however, were old enough that their TV tuners were
not fully "cable ready" with all of the current cable channels so in today's
world, I use a cheap, discarded VCR that still powers up.... makes a decent
tuner with today's capabilities... but as you know, most of those older
tuners were more sensitive and usually worked better for fringe off-air
reception.
Daniel Sofie
Electronics Supply & Repair
- - - - - -

 

[Michael A. Terrell]

Michael:
Yes.... the 2pc VCR units were a good candidate to permanently separate.....
I did many like you did, and in addition, separated the VCR, added 12 V
power and A/V connectors so that it could be used without the turner and AC
power supply..... many customers used them for their RVs and trailers.
Most of these 2pc units, however, were old enough that their TV tuners were
not fully "cable ready" with all of the current cable channels so in today's
world, I use a cheap, discarded VCR that still powers up.... makes a decent
tuner with today's capabilities... but as you know, most of those older
tuners were more sensitive and usually worked better for fringe off-air
reception.

That's why I used them, and we weren't worried about cable channels
so they were the perfect choice. Set it up, stick it into the bottom of
a relay rack, and feed it to the A/V switcher/router.

If someone wants the cable channels, they have little choice but to
use the newer VCR tuners.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida