Pronto discrete "On" caused discoloration?!

G

Guest

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Archived from groups: alt.tv.tech.hdtv,alt.tv.tech.misc (More info?)

A few weeks ago, I programmed a Pronto remote and started using it with
my home theater. My TV is a Sony KV-34HS510, 34" Trinitron WEGA. I
got the discrete off/on codes for Sony TV's from
http://www.remotecentral.com/ and I was using those. I soon noticed
that the sides of the TV were becoming badly discolored (up to 3-4"
on each side). I had a technician come out and degauss the TV, but the
problem came back as soon as I turned it back on.

Through experimentation, I finally realized that the problem only
occurred when I used the discrete "On" code from the Pronto. The
problem does not occur when turning the TV on using the Sony remote.

So, everything is back to normal EXCEPT that I now have a very slight
discoloration even when turning the TV on using the Sony remote. It is
only an area ~1/2" wide x 4" high on each side of the screen -
not nearly as bad as when using the discrete On code. But I would like
to get rid of it if I can.

One thing I noticed is that the top part of the screen pulls a
compass' North toward the screen; the bottom part of the screen
pushes North away from the screen. So, the top and bottom of the
screen have different charges, and the discolored area occurs in the
neutral area between the top and bottom.

Do you have any ideas about what can be done? Is it normal for the top
and bottom of the screen to have different charges? I wonder if using
the discrete On code for a period of weeks, or having the TV externally
degaussed actually messed it up permanently.
 
G

Guest

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Archived from groups: alt.tv.tech.hdtv,alt.tv.tech.misc (More info?)

There is a shielded Polk Audio center speaker located 1' above the TV.
The problem occurred whenever I turned the TV on with the discrete On,
even after removing the speaker. The internal TV speakers are on the
sides of the TV.

At the time the problem started, nothing had changed except using the
discrete On code. The problem occurred consistently and worsened over
a period of 2-3 weeks. I ran about a dozen trials, and the serious
discoloration problem only occurred when using the discrete On code.
Since I have switched back to my Sony remote, the serious discoloration
problem is gone -- there is only a small residual effect.

Even when using the discrete On code I could sometimes hear the
"boing" of the degausser. However, something must not have
happened exactly right, because the discoloration occurred even after I
heard the "boing" of the degausser.

The tech waved a degaussing coil in front of the TV screen for a few
seconds. He did not take the TV apart. My concern is that using the
discrete On code over a period of time may have allowed a build up of
magnetism on some parts of the TV if the discrete On code failed to
cause the TV to degauss properly when it was turned on.

I did find 4 *small* magnetic latches on the entertainment center that
were basically at the corners of the TV. It's possible that these
magnets in combination with improper degaussing are the cause of the
problem. I guess my question is: should I pay to have another tech
come out and degauss the TV again to try to get rid of the residual
discoloration, now that the internal degausser appears to be working
pretty well when using the Sony remote? Would an external degausser be
any better than the built-in degausser?
 

curmudgeon

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Apr 7, 2004
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Archived from groups: alt.tv.tech.hdtv,alt.tv.tech.misc (More info?)

BamaZealot wrote:
> A few weeks ago, I programmed a Pronto remote and started using it with
> my home theater. My TV is a Sony KV-34HS510, 34" Trinitron WEGA. I
> got the discrete off/on codes for Sony TV's from
> http://www.remotecentral.com/ and I was using those. I soon noticed
> that the sides of the TV were becoming badly discolored (up to 3-4"
> on each side). I had a technician come out and degauss the TV, but the
> problem came back as soon as I turned it back on.
>
> Through experimentation, I finally realized that the problem only
> occurred when I used the discrete "On" code from the Pronto. The
> problem does not occur when turning the TV on using the Sony remote.
>
> So, everything is back to normal EXCEPT that I now have a very slight
> discoloration even when turning the TV on using the Sony remote. It is
> only an area ~1/2" wide x 4" high on each side of the screen -
> not nearly as bad as when using the discrete On code. But I would like
> to get rid of it if I can.
>
> One thing I noticed is that the top part of the screen pulls a
> compass' North toward the screen; the bottom part of the screen
> pushes North away from the screen. So, the top and bottom of the
> screen have different charges, and the discolored area occurs in the
> neutral area between the top and bottom.
>
> Do you have any ideas about what can be done? Is it normal for the top
> and bottom of the screen to have different charges? I wonder if using
> the discrete On code for a period of weeks, or having the TV externally
> degaussed actually messed it up permanently.
>
That's really hard to believe...that somehow the discrete code turns the
set's degausser on full-time somehow....cause that's the only thing that
could possibly cause the discoloration you describe. More likely a bad
thermal switch controlling the degausser coils around your picture tube.
Oh...and having unshielded speakers too close to the set will also cause
what you've described.
 
G

Guest

Guest
Archived from groups: alt.tv.tech.hdtv,alt.tv.tech.misc (More info?)

"Curmudgeon" <curmudgeon@buzzoff.net> wrote in message
news:rn6Ge.9038$G71.744@bignews3.bellsouth.net...
> BamaZealot wrote:
>> A few weeks ago, I programmed a Pronto remote and started using it with
>> my home theater. My TV is a Sony KV-34HS510, 34" Trinitron WEGA. I
>> got the discrete off/on codes for Sony TV's from
>> http://www.remotecentral.com/ and I was using those. I soon noticed
>> that the sides of the TV were becoming badly discolored (up to 3-4"
>> on each side). I had a technician come out and degauss the TV, but the
>> problem came back as soon as I turned it back on.
>>
>> Through experimentation, I finally realized that the problem only
>> occurred when I used the discrete "On" code from the Pronto. The
>> problem does not occur when turning the TV on using the Sony remote.
>>
>> So, everything is back to normal EXCEPT that I now have a very slight
>> discoloration even when turning the TV on using the Sony remote. It is
>> only an area ~1/2" wide x 4" high on each side of the screen -
>> not nearly as bad as when using the discrete On code. But I would like
>> to get rid of it if I can.
>>
>> One thing I noticed is that the top part of the screen pulls a
>> compass' North toward the screen; the bottom part of the screen
>> pushes North away from the screen. So, the top and bottom of the
>> screen have different charges, and the discolored area occurs in the
>> neutral area between the top and bottom.
>>
>> Do you have any ideas about what can be done? Is it normal for the top
>> and bottom of the screen to have different charges? I wonder if using
>> the discrete On code for a period of weeks, or having the TV externally
>> degaussed actually messed it up permanently.
>>
> That's really hard to believe...that somehow the discrete code turns the
> set's degausser on full-time somehow....cause that's the only thing that
> could possibly cause the discoloration you describe. More likely a bad
> thermal switch controlling the degausser coils around your picture tube.
> Oh...and having unshielded speakers too close to the set will also cause
> what you've described.

The problem is likely nothing to do with the remote, just a failure
coincidental with the change you made. I just worked on wone like this. The
problem was intermittent. It turned out to be nothing in the degausing
circuit itself but a micro problem, as it controls the operation of the
degausing in this set. It is not a thermistor controlled circuit like most
televisions. When it happens, try cycling the power after a few minutes and
the circuit may complete the degaussing cycle. The solution will be to
replace the micro or the board with the micro on it.

Leonard
 
G

Guest

Guest
Archived from groups: alt.tv.tech.hdtv,alt.tv.tech.misc (More info?)

I know it sounds hard to believe, but I have proven to myself today
that the discrete On code is definitely part of the problem. The
problem is *not* intermittent. When I use the discrete On code,
discoloration is *very* bad. When I use the power toggle on the Sony
remote, the discoloration is still there, but only for a very small
area.

For the first time in about two weeks, I decided to try the discrete On
code with the Pronto remote again. The first time I tried the discrete
On, the TV was still warm, so the degausser did not activate, and the
screen was fine. Then I let the TV cool down for a half hour and
turned it on again using the discrete On. This time I could hear the
degausser activate, and I could immediately see that the discoloration
was much worse than it has been for the last two weeks. Either this is
a coincidence of gargantuan proportions, or the discrete On code is
causing a problem with the degausser.

I am definitely going to remove the magnetic latches from the
entertainment center just in case they are having some effect.
Unfortunately, the one year warranty has expired, so I guess I will
just deal with the very minor discoloration I am seeing when using the
Sony remote.
 
G

Guest

Guest
Archived from groups: alt.tv.tech.hdtv (More info?)

"BamaZealot" <bamazealot@yahoo.com> wrote in message
news:1122597168.932055.51370@o13g2000cwo.googlegroups.com...
>I know it sounds hard to believe, but I have proven to myself today
> that the discrete On code is definitely part of the problem. The
> problem is *not* intermittent. When I use the discrete On code,
> discoloration is *very* bad. When I use the power toggle on the Sony
> remote, the discoloration is still there, but only for a very small
> area.
>
> For the first time in about two weeks, I decided to try the discrete On
> code with the Pronto remote again. The first time I tried the discrete
> On, the TV was still warm, so the degausser did not activate, and the
> screen was fine. Then I let the TV cool down for a half hour and
> turned it on again using the discrete On. This time I could hear the
> degausser activate, and I could immediately see that the discoloration
> was much worse than it has been for the last two weeks. Either this is
> a coincidence of gargantuan proportions, or the discrete On code is
> causing a problem with the degausser.
>
> I am definitely going to remove the magnetic latches from the
> entertainment center just in case they are having some effect.
> Unfortunately, the one year warranty has expired, so I guess I will
> just deal with the very minor discoloration I am seeing when using the
> Sony remote.

Regardless, you need to be communicating this to Sony. There may be some
quirk in the micro...

Leonard
 
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