| Author |
Message |
da_test
Guest
|
 Posted:
Tue Feb 08, 2005 8:41 am Post subject:
What are the chances of finding a complete board for a 1992 |
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|
Hello,
despite my best efforts, I still seem to have an intermittent
fault of some kind related to the Jungle y/c board.
It sits vertically in the chassis. All I need to do is give it
the slightest tap on top of this board
and the normal picture is restored.
I've attempted to solder the board, but except for the IC chip,
and the plug in connectors, almost all the components on this
board are microscopic. (What are those tiny rectangular
looking things?)
The TV is a 1992 Sony kv27-xbr35.
I'm currently using it with the back off. When I switch it
on in the morning, picure is bright blue with retrace lines.
A tiny tap on the board restores the picture for the rest of the day.
It's really bizarre.
If the board was available I swap them out in a heartbeat.
As far as I know getting this board is probably next to impossible.
Appreciate any advice.
Dave
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Jerry G.
Guest
|
| Posted:
Tue Feb 08, 2005 7:51 pm Post subject:
Re: What are the chances of finding a complete board for a 1 |
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|
Why not give the set out to a service center that is used to working in
these sets?
To have a complete board, you will have to find a scrapper like your set
that is in working condition (very rare these days). The next complication
would be to do all the factory setups in the firmware of the TV uPC to have
it properly match.
You have a cold solder connection, or an intermitting component on the
board, and you haven't found it yet. Soldering a complete board is not the
proper answer.
These boards are using a lot of surface mount componets. They are difficult
to work in, unless properly trained, and have the proper soldering equipment
to change any that are defective. It is possible to have a component that
the solder connection under it has become a cold connection. It is also
possible to have a trace on either side of the board that is intermittant.
You should have the board jigged up so that you can gain proper access to
it. Have the service manual open in front of you, and troubleshoot the board
while the fault is occuring. Since the picture is very bright, I would be
looking in anywhere that can effect the screen bias, high voltage
regulation, or CRT drives.
When this board was available from Sony, it cost was very expensive. I have
never seen anyone have to replace a whole board to fix a cold solder
connection, or an intermittant component in the model of TV you have.
--
Jerry G.
=====
"da_test" <davexnet02NO@SPAMyahoo.com> wrote in message
news:v9mg0116hfbvl2uccv140qaha85jmjbe13@4ax.com...
Hello,
despite my best efforts, I still seem to have an intermittent
fault of some kind related to the Jungle y/c board.
It sits vertically in the chassis. All I need to do is give it
the slightest tap on top of this board
and the normal picture is restored.
I've attempted to solder the board, but except for the IC chip,
and the plug in connectors, almost all the components on this
board are microscopic. (What are those tiny rectangular
looking things?)
The TV is a 1992 Sony kv27-xbr35.
I'm currently using it with the back off. When I switch it
on in the morning, picure is bright blue with retrace lines.
A tiny tap on the board restores the picture for the rest of the day.
It's really bizarre.
If the board was available I swap them out in a heartbeat.
As far as I know getting this board is probably next to impossible.
Appreciate any advice.
Dave |
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| Back to top |
|
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Ol' Duffer
Guest
|
| Posted:
Tue Feb 08, 2005 8:57 pm Post subject:
Re: What are the chances of finding a complete board for a 1 |
|
|
Most makers are dropping support after 5 years now. But a lot
of sets that age are dying and being salvaged, so if you post
here and in other forums, there is a chance someone has one
collecting dust that died for some other reason.
In article <v9mg0116hfbvl2uccv140qaha85jmjbe13@4ax.com>,
davexnet02NO@SPAMyahoo.com says...
| Quote: | If the board was available I swap them out in a heartbeat.
As far as I know getting this board is probably next to impossible. |
|
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| Back to top |
|
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da_test
Guest
|
| Posted:
Thu Feb 10, 2005 2:17 am Post subject:
Re: What are the chances of finding a complete board for a 1 |
|
|
On Tue, 8 Feb 2005 08:51:07 -0500, "Jerry G." <jerryg50@hotmail.com>
wrote:
| Quote: | Why not give the set out to a service center that is used to working in
these sets?
To have a complete board, you will have to find a scrapper like your set
that is in working condition (very rare these days). The next complication
would be to do all the factory setups in the firmware of the TV uPC to have
it properly match.
You have a cold solder connection, or an intermitting component on the
board, and you haven't found it yet. Soldering a complete board is not the
proper answer.
These boards are using a lot of surface mount componets. They are difficult
to work in, unless properly trained, and have the proper soldering equipment
to change any that are defective. It is possible to have a component that
the solder connection under it has become a cold connection. It is also
possible to have a trace on either side of the board that is intermittant.
You should have the board jigged up so that you can gain proper access to
it. Have the service manual open in front of you, and troubleshoot the board
while the fault is occuring. Since the picture is very bright, I would be
looking in anywhere that can effect the screen bias, high voltage
regulation, or CRT drives.
When this board was available from Sony, it cost was very expensive. I have
never seen anyone have to replace a whole board to fix a cold solder
connection, or an intermittant component in the model of TV you have.
Jerry, thanks for a thoughtful answer. |
As you mentioned a jig is available, I guess it's some kind of
circuit board extention. Unfortunately, I don't have the
experience or expertise to work on this board,
and any possible reapir on my part would have been more
luck than anything.
That leaves a professional service center. It could be worth it.
But there comes a point when spending considerable $$$ on such an
old set seems unwise.
I guess I'm stuck for now.
appreciate the insight.
Dave |
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James Sweet
Guest
|
| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: What are the chances of finding a complete board for a 1 |
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|
"da_test" <davexnet02NO@SPAMyahoo.com> wrote in message
news:skpl015r1ckn7hp99r928pi41pc18faif7@4ax.com...
| Quote: | On Thu, 10 Feb 2005 03:39:48 GMT, "James Sweet"
jamessweet@hotmail.com> wrote:
It's not entirely uncommon to find a set like this with a bad CRT, that's
probably your best bet. I've found a similar one once that had been
dropped
so the CRT was broken.
how did you find it?
Were you driving around the neighborhood and saw it
sitting on the curb side?
Did you place an ad?
Cheers,
Dave
|
I found it next to the dumpster at the apartment complex I lived in, I've
also gotten free broken TV's from ads on craigslist, there's many places you
can look. |
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da_test
Guest
|
| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: What are the chances of finding a complete board for a 1 |
|
|
On Thu, 10 Feb 2005 03:39:48 GMT, "James Sweet"
<jamessweet@hotmail.com> wrote:
| Quote: |
It's not entirely uncommon to find a set like this with a bad CRT, that's
probably your best bet. I've found a similar one once that had been dropped
so the CRT was broken.
how did you find it? |
Were you driving around the neighborhood and saw it
sitting on the curb side?
Did you place an ad?
Cheers,
Dave |
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| Back to top |
|
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James Sweet
Guest
|
| Posted:
Thu Feb 10, 2005 8:41 am Post subject:
Re: What are the chances of finding a complete board for a 1 |
|
|
"da_test" <davexnet02NO@SPAMyahoo.com> wrote in message
news:v9mg0116hfbvl2uccv140qaha85jmjbe13@4ax.com...
| Quote: | Hello,
despite my best efforts, I still seem to have an intermittent
fault of some kind related to the Jungle y/c board.
It sits vertically in the chassis. All I need to do is give it
the slightest tap on top of this board
and the normal picture is restored.
I've attempted to solder the board, but except for the IC chip,
and the plug in connectors, almost all the components on this
board are microscopic. (What are those tiny rectangular
looking things?)
The TV is a 1992 Sony kv27-xbr35.
I'm currently using it with the back off. When I switch it
on in the morning, picure is bright blue with retrace lines.
A tiny tap on the board restores the picture for the rest of the day.
It's really bizarre.
If the board was available I swap them out in a heartbeat.
As far as I know getting this board is probably next to impossible.
Appreciate any advice.
Dave
|
It's not entirely uncommon to find a set like this with a bad CRT, that's
probably your best bet. I've found a similar one once that had been dropped
so the CRT was broken. |
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