Freeze Spray

[John Keiser]

3 year old Magnovox TV out of focus until warmes up. I suspect power supply
component.

I have a can of freeze spray but the frist quickly causes moisture which
seems a bad idea.

How does one effectively use freeze spray and avoid moisture damage?

Thanks..


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On Fri, 5 Dec 2003 10:15:22 -1000, "John Keiser"
<john.keiser2@verizon.net> wrote:

3 year old Magnovox TV out of focus until warmes up. I suspect power supply
component.

I have a can of freeze spray but the frist quickly causes moisture which
seems a bad idea.

How does one effectively use freeze spray and avoid moisture damage?

Thanks..

This stuff works great when you need sex and there is no woman around
to satisfy you. Just spray on the offending organ, and all urges are
gone !!!! <lol>

 

[Tweetldee]

"John Keiser" <john.keiser2@verizon.net> wrote in message
news:bqqp13$25l526$1@ID-128410.news.uni-berlin.de...

3 year old Magnovox TV out of focus until warmes up. I suspect power
supply
component.

I have a can of freeze spray but the frist quickly causes moisture which
seems a bad idea.

How does one effectively use freeze spray and avoid moisture damage?

Thanks..

Freeze spray is probably one of the most mis-used chemicals in the
electronics servicing industry. You don't use a heavy spray, no matter how
badly you are tempted. Hit the suspect component(s) with a very quick burst
of the spray. Isolate the spray to a single component, not a large area.
Frost may form momentarily, but will quickly evaporate. The quick burst
will lower the temperature of the component quickly and adequately, and will
allow you to determine whether you have found the culprit.
If you use the spray this way, you will get the maximum benefit from your
expensive spray, and find the defective component more quickly.
I have never found the moisture caused by melting frost to be a problem
except in very sensitive circuits. I don't recommend that you use the spray
in or around high voltage, especially CRT's.
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Tweetldee
Tweetldee at att dot net (Just subsitute the appropriate characters in the
address)

Never take a laxative and a sleeping pill at the same time!!

 

[John Keiser]

Thank you. I was over-doing the heavy frost idea.

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[Andy Cuffe]

John Keiser wrote:

3 year old Magnovox TV out of focus until warmes up. I suspect power supply
component.

I have a can of freeze spray but the frist quickly causes moisture which
seems a bad idea.

How does one effectively use freeze spray and avoid moisture damage?

Thanks..

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If it just going out of focus with no other changes in the picture (such
as width, or brightness) it's probably the flyback, or CRT. There's a
slight chance the CRT socket is arcing (listen for any hissing coming
from the socket, or an ozone smell).
--
Andy Cuffe
baltimora@psu.edu

 

[John Keiser]

There is indeed arcing at the CRT socket when the TV is first turned on.
Goes away when warmed up. Applying a heat gun to the CRT socket when cold
seemed to prevent the arcing so I disassembled and cleaned the spark gap.
[I was hoping to see some mositure/dirt/carbon but nothing visible.]
Didn't seem to fix.
On the theory that the HV is excessive, I looked for some heat-senstive
component in the HOT area. Again, something that would come into specs when
warmed up. So I tried a shot of freeze spray on a couple of caps and some
resistors, thinking the sparking might restart if I could mimic a cold start
up. Didn't.
Will play with it some more.
Appreciate your helpful comments.


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[Cher]

i think u are on the right track.

maybe a bad focus adj. pot or ground on it.

Acring when turned on could be humidity condensation - but maybe not
in the winter depending on where u live.

if the pix doesn't respond to the arcing then that shouldn't be part
of this problem.

On Sat, 6 Dec 2003 09:59:18 -1000, "John Keiser"
<john.keiser2@verizon.net> wrote:

There is indeed arcing at the CRT socket when the TV is first turned on.
Goes away when warmed up. Applying a heat gun to the CRT socket when cold
seemed to prevent the arcing so I disassembled and cleaned the spark gap.
[I was hoping to see some mositure/dirt/carbon but nothing visible.]
Didn't seem to fix.
On the theory that the HV is excessive, I looked for some heat-senstive
component in the HOT area. Again, something that would come into specs when
warmed up. So I tried a shot of freeze spray on a couple of caps and some
resistors, thinking the sparking might restart if I could mimic a cold start
up. Didn't.
Will play with it some more.
Appreciate your helpful comments.