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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Andrew Crawford
 
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Default Internal ghosting on a JVC TV - any ideas?

I have acquired a mid-90s JVC 20" TV. Quite a nice model, and I'd like
to set it up for the kids to watch their shows so I can occasionally use
the main TV to watch mine

Anyway, it's unwatchable due to a ghosting problem. This is something
I've usually associated with antennas, but there's no antenna in the set
up here.

* TV tuned to cable connection: strong ghost trailing by 1/8"
(note; any channel. Also other TV no ghost in same situation)

* TV on AV from a DVD player: strong ghost trailing by 1/8"

BUT

TV's own character generator in menus etc: beautiful, sharp edges with
no ghosting whatsoever.

Any ideas? I'm trying to figure out if this is work having repaired.

Cheers,

Andrew
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NSM
 
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Default


"Andrew Crawford" -NOT wrote in message
...
I have acquired a mid-90s JVC 20" TV. Quite a nice model, and I'd like
to set it up for the kids to watch their shows so I can occasionally use
the main TV to watch mine

Anyway, it's unwatchable due to a ghosting problem. This is something
I've usually associated with antennas, but there's no antenna in the set
up here.

* TV tuned to cable connection: strong ghost trailing by 1/8"
(note; any channel. Also other TV no ghost in same situation)

* TV on AV from a DVD player: strong ghost trailing by 1/8"

BUT

TV's own character generator in menus etc: beautiful, sharp edges with
no ghosting whatsoever.

Any ideas? I'm trying to figure out if this is work having repaired.


The video signal is being coupled into an input stage somewhere. Find
someone who has serviced this model before - they may be able to eyeball the
problem.
--
N

















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Jerry G.
 
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Default

The problem is before where the character generator insertion is done. This
would be in the video path along from where the video circuit processing
starts. Many times, this is caused by capacitors in the signal path, that
have gone off their proper values.

Using a video test generator, and scope, the stage where the fault is can be
tracked down. The capacitors can be properly checked with an ESR meter.

I would think you got the set for very cheap, because of this problem.

If you take the set to a service centre, if the tech knows his work, he
should be able to easily service this for you. The cost should not be too
high. The time to do the troubleshooting will be the largest part of the
cost.

--

Jerry G.
=====

"Andrew Crawford" -NOT wrote in message
...
I have acquired a mid-90s JVC 20" TV. Quite a nice model, and I'd like
to set it up for the kids to watch their shows so I can occasionally use
the main TV to watch mine

Anyway, it's unwatchable due to a ghosting problem. This is something
I've usually associated with antennas, but there's no antenna in the set
up here.

* TV tuned to cable connection: strong ghost trailing by 1/8"
(note; any channel. Also other TV no ghost in same situation)

* TV on AV from a DVD player: strong ghost trailing by 1/8"

BUT

TV's own character generator in menus etc: beautiful, sharp edges with
no ghosting whatsoever.

Any ideas? I'm trying to figure out if this is work having repaired.

Cheers,

Andrew


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Default

It sounds to me like a bad delay line or an open termination to the
delay line, or possibly some other problem after the signal has been
demodulated down to the video level.

H. R. (Bob) Hofmann

  #5   Report Post  
Andrew Crawford
 
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Default

Thanks to all for replies - sounds like it might be worth taking for repair.

cheers,

Andrew
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