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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.

JVC tube TV with shrinking picture; worth fixing?



 
 
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  #1  
Old June 10th 08, 04:25 AM posted to sci.electronics.repair
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Default JVC tube TV with shrinking picture; worth fixing?

Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is January
1995). In the last few months, however, it has developed an annoying
problem. The picture periodically shrinks down horizontally (that is, the
screen turns dark above and below, and what's left is a thin, squished-down
picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a problem
that likely can be fixed for significantly less than the price of replacing
the television? Bringing this heavy sucker to a repair shop would be no
pleasure, but if the problem seems manageable, by gosh I'll do it.

Doug in Berkeley


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  #2  
Old June 10th 08, 07:17 AM posted to sci.electronics.repair
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Posts: 9
Default JVC tube TV with shrinking picture; worth fixing?

could be a dry soldering joint on the vertical
circuit, look for bad or cracked solder and resolder it.

"Doug Greenberg" wrote in message
...
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is
January 1995). In the last few months, however, it has developed an
annoying problem. The picture periodically shrinks down horizontally
(that is, the screen turns dark above and below, and what's left is a
thin, squished-down picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a
problem that likely can be fixed for significantly less than the price of
replacing the television? Bringing this heavy sucker to a repair shop
would be no pleasure, but if the problem seems manageable, by gosh I'll do
it.

Doug in Berkeley



  #3  
Old June 10th 08, 07:24 AM posted to sci.electronics.repair
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Posts: 235
Default JVC tube TV with shrinking picture; worth fixing?


Doug Greenberg wrote:
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is January
1995). In the last few months, however, it has developed an annoying
problem. The picture periodically shrinks down horizontally (that is, the
screen turns dark above and below, and what's left is a thin, squished-down
picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a problem
that likely can be fixed for significantly less than the price of replacing
the television? Bringing this heavy sucker to a repair shop would be no
pleasure, but if the problem seems manageable, by gosh I'll do it.

Doug in Berkeley




You've got a bad solder joint in the vertical deflection section. It's a
10 minute fix for someone who knows how to solder. No parts required.

Don't run it like that, you'll burn the phosphor on the face of the tube.
  #4  
Old June 10th 08, 03:35 PM posted to sci.electronics.repair
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Posts: 100
Default JVC tube TV with shrinking picture; worth fixing?



On Tue, 10 Jun 2008 05:24:22 GMT, James Sweet
wrote:


Doug Greenberg wrote:
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is January
1995). In the last few months, however, it has developed an annoying
problem. The picture periodically shrinks down horizontally (that is, the
screen turns dark above and below, and what's left is a thin, squished-down
picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a problem
that likely can be fixed for significantly less than the price of replacing
the television? Bringing this heavy sucker to a repair shop would be no
pleasure, but if the problem seems manageable, by gosh I'll do it.

Doug in Berkeley




You've got a bad solder joint in the vertical deflection section. It's a
10 minute fix for someone who knows how to solder. No parts required.

Don't run it like that, you'll burn the phosphor on the face of the tube.




Resolder all the pins on the vertical ic and it should work fine.
Very common problem on this set. Chuck
  #5  
Old June 11th 08, 01:04 AM posted to sci.electronics.repair
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Posts: 31
Default JVC tube TV with shrinking picture; worth fixing?

Doug Greenberg wrote:
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS (I
think). It's been a good TV for 13 years now (manufacturing date is January
1995). In the last few months, however, it has developed an annoying
problem. The picture periodically shrinks down horizontally (that is, the
screen turns dark above and below, and what's left is a thin, squished-down
picture perhaps three or four inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually has
gotten worse.

Any ideas of what would cause this, and just as important, is this a problem
that likely can be fixed for significantly less than the price of replacing
the television? Bringing this heavy sucker to a repair shop would be no
pleasure, but if the problem seems manageable, by gosh I'll do it.

Doug in Berkeley



I have a similar 27" JVC TV, model AV-27770. It had the exact same
symptoms, including banging on it for a temporary "fix". The problem was
a bad solder joint on the CRT socket's PC board.

Look at all the PC boards with a magnifying glass for joints that have a
cracked "ring" around the connection. This happens from heat & age, and
seems to be fairly common on items like this.

  #6  
Old June 11th 08, 01:25 AM posted to sci.electronics.repair
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Posts: 235
Default JVC tube TV with shrinking picture; worth fixing?


Sofa Slug wrote:
Doug Greenberg wrote:
Hello,
We have an elderly JVC 27-inch tube-type television, Model AV-27BMS
(I think). It's been a good TV for 13 years now (manufacturing date
is January 1995). In the last few months, however, it has developed
an annoying problem. The picture periodically shrinks down
horizontally (that is, the screen turns dark above and below, and
what's left is a thin, squished-down picture perhaps three or four
inches tall).

If someone bangs lightly on the side of the TV the picture returns to
normal--for a while. But the problem doesn't go away and it actually
has gotten worse.

Any ideas of what would cause this, and just as important, is this a
problem that likely can be fixed for significantly less than the price
of replacing the television? Bringing this heavy sucker to a repair
shop would be no pleasure, but if the problem seems manageable, by
gosh I'll do it.

Doug in Berkeley



I have a similar 27" JVC TV, model AV-27770. It had the exact same
symptoms, including banging on it for a temporary "fix". The problem was
a bad solder joint on the CRT socket's PC board.

Look at all the PC boards with a magnifying glass for joints that have a
cracked "ring" around the connection. This happens from heat & age, and
seems to be fairly common on items like this.



No way a solder joint on the CRT socket board affected vertical
deflection, nothing in the deflection circuit routes through that board.
The mechanical stresses of taking the set apart and putting it back
together may have "fixed" the bad joint in the deflection though.
  #7  
Old June 12th 08, 01:12 AM posted to sci.electronics.repair
b
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Posts: 764
Default JVC tube TV with shrinking picture; worth fixing?

On 10 jun, 04:25, "Doug Greenberg" wrote:

Any ideas of what would cause this, and just as important, is this a problem
that likely can be fixed for significantly less than the price of replacing
the television? Bringing this heavy sucker to a repair shop would be no
pleasure, but if the problem seems manageable, by gosh I'll do it.

Doug in Berkeley


Agree wholeheartedly with the others - this is fixable and could be
saved from the landfill. if you're not up to soldering, I'm sure
someone could help you out in your area. Good luck!

-B

  #8  
Old June 12th 08, 06:58 PM posted to sci.electronics.repair
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Posts: 2
Default JVC tube TV with shrinking picture; worth fixing?


The set is fixed! Local repair guy came over and fixed it on the spot.
$125 plus a nominal charge for the house call. Sorry I don't have the
wherewithall to do it myself, particularly where there is bigtime electrical
voltage involved. Well worth the price to us; as others have said, it's
better than clogging up the landfill and using more resources on a new one.
And it's been a very good tv, in any case.

Thanks for all input.
DG


 




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