Sony KV-27V26, built in Oct '97. The video suddenly went out.

I would turn it on and it would be fine for 10-60 seconds, then the
picture would compress into a 1' horizontal picture for 5-10 seconds
and then it would go blank until the next time I'd turn it on. If I'd
turn it off & right back on, it'd just go right to a blank screen.
Audio is always okay.

I don't do TV repair, but did read up on it & Sony's common blanking
problem (esp for time when mine was built.)

I opened it up to try to adjust the voltage & see if I can "buy some
time." Very dusty. I blew it out with a can of compressed air.
Turned the TV on and it workedfine! It's been on for about an hour
and is okay. Never had to touch the voltage adjuster.

Anyone have any idea how long I can expect this TV to work? Was the
excessive dust allowing it to short somewhere? Any possible damage
caused or things that might give me trouble in the future?

Thanks!

John:
You did NOT fix anything.... the intermittent problem is still lurking
in the television....
possibly cracked or faulty solder connnections in and around the V
Deflection circuitry or the flyback derived B+ sources to that
circuitry. Blowing the dust out may keep things a little cooler thus
the cracked connections won't act up as much..... get this fixed right
before it fails drastically and more expensively.... do not nurse
this along.
electricitym
-- - - - -

On 28 Apr 2005 21:35:53 -0700, wrote:
John:
You did NOT fix anything.... the intermittent problem is still lurking
in the television....
possibly cracked or faulty solder connnections in and around the V
Deflection circuitry or the flyback derived B+ sources to that
circuitry. Blowing the dust out may keep things a little cooler thus
the cracked connections won't act up as much..... get this fixed right
before it fails drastically and more expensively.... do not nurse
this along.
electricitym

First, thanks for replying.

I don't know anything about TV repair. Where is the vertical
deflection circuit board? The flyback... is that the 3-4" tall black
part that sits on the mainboard between the AV outs and what looks
like silver heat sinks? It also has a think red wire going from it to
the top of the back of the TV.

I can see no signs of cracking. Would this be visible or would I need
to measure resistances all over?

Anyone have a picture/layout of one of the inside of one of these
models? Or just of a Sony or generic layout would be helpful too.

Thanks agian,

On 28 Apr 2005 21:35:53 -0700, wrote:

John:
You did NOT fix anything.... the intermittent problem is still lurking
in the television....
possibly cracked or faulty solder connnections in and around the V
Deflection circuitry or the flyback derived B+ sources to that
circuitry. Blowing the dust out may keep things a little cooler thus
the cracked connections won't act up as much..... get this fixed right
before it fails drastically and more expensively.... do not nurse
this along.
electricitym
-- - - - -

Oh yeah, I also figure me moving everything around to get the back
cover off and then pulling the main board out some might've
reconnected a bad/cracking connection.

Would either of those you mentioned be a relatively inexpensive
replacement at a shop?

John Williams wrote:
On 28 Apr 2005 21:35:53 -0700, wrote:
First, thanks for replying.

I don't know anything about TV repair. Where is the vertical
deflection circuit board? The flyback... is that the 3-4" tall black
part that sits on the mainboard between the AV outs and what looks
like silver heat sinks? It also has a think red wire going from it
to
the top of the back of the TV.

I can see no signs of cracking. Would this be visible or would I
need
to measure resistances all over?

From what you are saying, I really think you ough to get this set to a
tech, as you could mess things up more if you lack the experience and
knowledge to tackle this. At the very least you need to be able to
solder precisely, and locate the suspect areas. I feel it will work out
cheaper in the long run to get this set looked at by a pro, especially
since it could just mean a bit of soldering. If you leave it, more
expenisve components will be stressed.

good luck. Ben

On Thu, 28 Apr 2005 23:41:00 -0700, John Williams
o t m a i l.com wrote:

On 28 Apr 2005 21:35:53 -0700, wrote:

John:
You did NOT fix anything.... the intermittent problem is still lurking
in the television....
possibly cracked or faulty solder connnections in and around the V
Deflection circuitry or the flyback derived B+ sources to that
circuitry. Blowing the dust out may keep things a little cooler thus
the cracked connections won't act up as much..... get this fixed right
before it fails drastically and more expensively.... do not nurse
this along.
electricitym
-- - - - -

Oh yeah, I also figure me moving everything around to get the back
cover off and then pulling the main board out some might've
reconnected a bad/cracking connection.

Would either of those you mentioned be a relatively inexpensive
replacement at a shop?

It doesn't need a replacement, as such, it needs a professional
resoldering of the vertical deflection circuitry. Don't try it
yourself, because the pins are very close together, and should you
bridge then and not see it, then it could be anything from an
expensive repair to not worth the money.

Tom

You disturbed something back in to place that is failing. The fix will be
temporary. It will take an experienced TV service tech to properly service
this for you.

The fault may be an intermittent solder connection, or a component that is
starting to fail. The tech can not visually find the failure, he will have
to provoke the set to be in the failing condition, and then troubleshoot it
to find where the failure is.

Servicing these sets, is not based on simple resistance measurements. There
are proper procedures, and tests to properly service a TV set.

For safety reasons you should not be messing in your set. There are serious
safety issues involved.

--

JANA
_____


"John Williams" o t m a i l.com wrote in message
...
On 28 Apr 2005 21:35:53 -0700, wrote:
John:
You did NOT fix anything.... the intermittent problem is still lurking
in the television....
possibly cracked or faulty solder connnections in and around the V
Deflection circuitry or the flyback derived B+ sources to that
circuitry. Blowing the dust out may keep things a little cooler thus
the cracked connections won't act up as much..... get this fixed right
before it fails drastically and more expensively.... do not nurse
this along.
electricitym

First, thanks for replying.

I don't know anything about TV repair. Where is the vertical
deflection circuit board? The flyback... is that the 3-4" tall black
part that sits on the mainboard between the AV outs and what looks
like silver heat sinks? It also has a think red wire going from it to
the top of the back of the TV.

I can see no signs of cracking. Would this be visible or would I need
to measure resistances all over?

Anyone have a picture/layout of one of the inside of one of these
models? Or just of a Sony or generic layout would be helpful too.

Thanks agian,