TV repair advice

[Just Trev]

Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance



--
Just Trev

( any spelling errors in the above information is no responsibility of the
author, but merely due to a malfunctioning keyboard)

 

[David]

The tech needs to diagnose the set by making voltage and waveform
measurements, especially to the picture tube. Any failure of any of the
voltages to the tube, the high voltage system, the picture tube itself, and
many other possibilities could cause your symptom.

Given the extreme old age of the tv set, given todays average usage, it is
highly suspect the picture tube could be worn out from use.

David

Just Trev <lewis-at-quicksilver.net.nz> wrote in message
news:1070747410.220524@drone5.qsi.net.nz...

Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance



--
Just Trev

( any spelling errors in the above information is no responsibility of the
author, but merely due to a malfunctioning keyboard)

 

[Jerry G.]

You would have to have the set properly checked. The voltages to the CRT
will have to be verified. It is possible that the high voltage multiplier
module has a fault condition. Considering the age of the set, it is very
possible that the tube (CRT) is coming to an end.

I would not put any money in to a set this old. Personally, I would be
shopping for a new set.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
=========================================


"Just Trev" <lewis-at-quicksilver.net.nz> wrote in message
news:1070747410.220524@drone5.qsi.net.nz...
Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance



--
Just Trev

( any spelling errors in the above information is no responsibility of the
author, but merely due to a malfunctioning keyboard)

 

[James Sweet]

"Just Trev" <lewis-at-quicksilver.net.nz> wrote in message
news:1070747410.220524@drone5.qsi.net.nz...

Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance



--
Just Trev

Sounds to me like the tube, this is the usual symptom of a picture tube
failure. Wouldn't hurt to have it tested though, a CRT test only takes a few
minutes with the right tool.

 

[Sam Goldwasser]

"Jerry G." <jerryg50@hotmail.com> writes:

You would have to have the set properly checked. The voltages to the CRT
will have to be verified. It is possible that the high voltage multiplier
module has a fault condition. Considering the age of the set, it is very
possible that the tube (CRT) is coming to an end.

I would not put any money in to a set this old. Personally, I would be
shopping for a new set.

And perhaps just tweaking the focus would get a couple more years out
of it. May not be worth putting much money into it but a "set that old"?
Come on! Would you throw out humans when they get beyond their youth and
the first sign of some medical problems appear?

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

"Just Trev" <lewis-at-quicksilver.net.nz> wrote in message
news:1070747410.220524@drone5.qsi.net.nz...
Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance

 

[john]

The set is only 9 years old ,what the hell are you talking about Extreme old
age

yikes

kip

Given the extreme old age of the tv set, given todays average usage, it is

highly suspect the picture tube could be worn out from use.

 

[David]

Do the math. 25,000 hours is your typical picture tube life for most
average tv sets made in the last 10 years (a few will go longer) but 25,000
hours has been the industry average expected life for picture tubes at least
since 1990.

Since the average tv set since 1990 also gets watched considerably more than
in prior years, they are not going to last as long either.

Average tv time on, 7.5 hours per day, 365 days per year, for 9 years is
25,000 hours. Extreme old age in tv set years.

I see 1999 model tv sets that already are worn out from extreme usage and
age.

David

john <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$p8djph$q37$1@newsfeed.niagara.com...

The set is only 9 years old ,what the hell are you talking about Extreme
old
age

yikes

kip

Given the extreme old age of the tv set, given todays average usage, it
is
highly suspect the picture tube could be worn out from use.

 

[Leonard Caillouet]

Where do you get these numbers? What justifies this kind of generalization
across manufacturers and CRT sizes?

Leonard Caillouet

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fd41657@news.greennet.net...

Do the math. 25,000 hours is your typical picture tube life for most
average tv sets made in the last 10 years (a few will go longer) but
25,000
hours has been the industry average expected life for picture tubes at
least
since 1990.

Since the average tv set since 1990 also gets watched considerably more
than
in prior years, they are not going to last as long either.

Average tv time on, 7.5 hours per day, 365 days per year, for 9 years is
25,000 hours. Extreme old age in tv set years.

I see 1999 model tv sets that already are worn out from extreme usage and
age.

David

john <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$p8djph$q37$1@newsfeed.niagara.com...
The set is only 9 years old ,what the hell are you talking about Extreme
old
age

yikes

kip

Given the extreme old age of the tv set, given todays average usage, it
is
highly suspect the picture tube could be worn out from use.

 

[David]

25,000 hours was the industry standard in teh early 90's for the most common
size tv sets being sold, 25" and 27". That particular number was put out by
both Philips and Thomson in the early 90's. The number of hours tv sets are
watched on average has gone up considerably. The last information I had was
when our Thomson field rep showed us the results of the warranty clock
information after they stopped requiring the information for warranty
claims. The average hours they showed tv sets being used per day was close
to 7.5 hours a day.

Those numbers are definitely believable from what I have seen.
The picture tube hours are definitely beleivable considering what I have
seen at a local hospital. 20" Zenith sets installed in Feb 2000, worn out
picture tubes this year on three of four that were in waiting areas an
almost never were turned off. Yes, the picture settings were not left at
factory default settings but turned down a bit when they were first
installed. Approximately 26,000 hours on the tv sets to date and the edges
are way out of focus, gray scale will not track (very green not matter what
adjustments), bright areas go totally out of focus, extensive saturation
bleeding of the blue and red to the right.

I was not generalizing across the board, most average tv sets is not all of
them.
The Panasonic 25-31" does typically fall right in the average category.
The early 90's Mitz 35" tubes do not fall into the average category as I
have rebuilt many chassis's capacitor problems and the tubes are still very
strong.

David

Leonard Caillouet <lcailloNOSPAM@devoynet.com> wrote in message
news:RfSAb.39977$_h.31033@lakeread02...

Where do you get these numbers? What justifies this kind of
generalization
across manufacturers and CRT sizes?

Leonard Caillouet

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fd41657@news.greennet.net...
Do the math. 25,000 hours is your typical picture tube life for most
average tv sets made in the last 10 years (a few will go longer) but
25,000
hours has been the industry average expected life for picture tubes at
least
since 1990.

Since the average tv set since 1990 also gets watched considerably more
than
in prior years, they are not going to last as long either.

Average tv time on, 7.5 hours per day, 365 days per year, for 9 years is
25,000 hours. Extreme old age in tv set years.

I see 1999 model tv sets that already are worn out from extreme usage
and
age.

David

john <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$p8djph$q37$1@newsfeed.niagara.com...
The set is only 9 years old ,what the hell are you talking about
Extreme
old
age

yikes

kip

Given the extreme old age of the tv set, given todays average usage,
it
is
highly suspect the picture tube could be worn out from use.

 

[James Sweet]

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fd41657@news.greennet.net...

Do the math. 25,000 hours is your typical picture tube life for most
average tv sets made in the last 10 years (a few will go longer) but
25,000
hours has been the industry average expected life for picture tubes at
least
since 1990.

Since the average tv set since 1990 also gets watched considerably more
than
in prior years, they are not going to last as long either.

Average tv time on, 7.5 hours per day, 365 days per year, for 9 years is
25,000 hours. Extreme old age in tv set years.

I see 1999 model tv sets that already are worn out from extreme usage and
age.

David

7.5 hours a day seems awfully high, I doubt my TV's get that much use in a
week.

 

[Leonard Caillouet]

Are any manufacturers currently publishing estimates of CRT life? Were not
most of those estimates for 50% emission? At that point most CRTs have a
lot of useful life left in them.

I suppose my experience is more with better brands. Philips, Thomson, and
Zenith are peripheral to our business, though the Thomson tubes seem to be
holding up pretty well that I have seen. Philips and Zenith are typically
crap, IMO.

Leonard Caillouet

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fd43381@news.greennet.net...

25,000 hours was the industry standard in teh early 90's for the most
common
size tv sets being sold, 25" and 27". That particular number was put out
by
both Philips and Thomson in the early 90's. The number of hours tv sets
are
watched on average has gone up considerably. The last information I had
was
when our Thomson field rep showed us the results of the warranty clock
information after they stopped requiring the information for warranty
claims. The average hours they showed tv sets being used per day was
close
to 7.5 hours a day.

Those numbers are definitely believable from what I have seen.
The picture tube hours are definitely beleivable considering what I have
seen at a local hospital. 20" Zenith sets installed in Feb 2000, worn out
picture tubes this year on three of four that were in waiting areas an
almost never were turned off. Yes, the picture settings were not left at
factory default settings but turned down a bit when they were first
installed. Approximately 26,000 hours on the tv sets to date and the
edges
are way out of focus, gray scale will not track (very green not matter
what
adjustments), bright areas go totally out of focus, extensive saturation
bleeding of the blue and red to the right.

I was not generalizing across the board, most average tv sets is not all
of
them.
The Panasonic 25-31" does typically fall right in the average category.
The early 90's Mitz 35" tubes do not fall into the average category as I
have rebuilt many chassis's capacitor problems and the tubes are still
very
strong.

David

Leonard Caillouet <lcailloNOSPAM@devoynet.com> wrote in message
news:RfSAb.39977$_h.31033@lakeread02...
Where do you get these numbers? What justifies this kind of
generalization
across manufacturers and CRT sizes?

Leonard Caillouet

"David" <dkuhajda@locl.net.spam> wrote in message
news:3fd41657@news.greennet.net...
Do the math. 25,000 hours is your typical picture tube life for most
average tv sets made in the last 10 years (a few will go longer) but
25,000
hours has been the industry average expected life for picture tubes at
least
since 1990.

Since the average tv set since 1990 also gets watched considerably
more
than
in prior years, they are not going to last as long either.

Average tv time on, 7.5 hours per day, 365 days per year, for 9 years
is
25,000 hours. Extreme old age in tv set years.

I see 1999 model tv sets that already are worn out from extreme usage
and
age.

David

john <va3mmTAKEOUTTHIS@niagara.com> wrote in message
news:newscache$p8djph$q37$1@newsfeed.niagara.com...
The set is only 9 years old ,what the hell are you talking about
Extreme
old
age

yikes

kip

Given the extreme old age of the tv set, given todays average
usage,
it
is
highly suspect the picture tube could be worn out from use.

 

[Andre]

Sam Goldwasser <sam@saul.cis.upenn.edu> wrote in message news:<6wsmjw3g61.fsf@saul.cis.upenn.edu>...

"Jerry G." <jerryg50@hotmail.com> writes:

You would have to have the set properly checked. The voltages to the CRT
will have to be verified. It is possible that the high voltage multiplier
module has a fault condition. Considering the age of the set, it is very
possible that the tube (CRT) is coming to an end.

I would not put any money in to a set this old. Personally, I would be
shopping for a new set.

And perhaps just tweaking the focus would get a couple more years out
of it. May not be worth putting much money into it but a "set that old"?
Come on! Would you throw out humans when they get beyond their youth and
the first sign of some medical problems appear?

Good point Sam

I've got a few monitors working like that, I suspect the focus really
does drift with age though when it is adjusted back sometimes it still
doesen't look right.

-A

--- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/
Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/
+Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm
| Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html

Important: The email address in this message header may no longer work. To
contact me, please use the Feedback Form at repairfaq.org. Thanks.

"Just Trev" <lewis-at-quicksilver.net.nz> wrote in message
news:1070747410.220524@drone5.qsi.net.nz...
Any TV techs out there who can give me some advice please?

Our 29inch Panasonic (fairly old, but not ancient - maybe 9 years?) is
getting more and more out of focus. We noticed it to start with on the
edges of the screen, when things like subtitles or sports scores were very
fuzzy, hard to read.

Now the whole screen seems to be getting effected.

Yes- I do have my contacts in - and others notice it too.

Contrast and brightness are also pretty much on full, and the picture is
only just light enough - if you know what I mean.

So - do we need to get a new one, or would a Tech be able to adjust or
replace parts without huge expense?

Thanks in advance

 

[Halfgaar]

Leonard Caillouet wrote:

Are any manufacturers currently publishing estimates of CRT life? Were
not
most of those estimates for 50% emission? At that point most CRTs have a
lot of useful life left in them.

So after a lot of running-hours, you have a TV which emits elevated levels
of radiation? How high are we talking about? And what is the cause of this?

I suppose my experience is more with better brands. Philips, Thomson, and
Zenith are peripheral to our business, though the Thomson tubes seem to be
holding up pretty well that I have seen. Philips and Zenith are typically
crap, IMO.

What about the Sony Trinitron picture tubes used in computer monitors? Are
they crap as well?

Halfgaar
--
To send me, Halfgaar, email, remove remove from my email address.

 

[James Sweet]

"Halfgaar" <voor_achter@yahoo.remove.com> wrote in message
news:br29fr$cbt$1@news4.tilbu1.nb.home.nl...

Leonard Caillouet wrote:

Are any manufacturers currently publishing estimates of CRT life? Were
not
most of those estimates for 50% emission? At that point most CRTs have
a
lot of useful life left in them.

So after a lot of running-hours, you have a TV which emits elevated levels
of radiation? How high are we talking about? And what is the cause of
this?

Where's he say anything about radiation?

I suppose my experience is more with better brands. Philips, Thomson,
and
Zenith are peripheral to our business, though the Thomson tubes seem to
be
holding up pretty well that I have seen. Philips and Zenith are
typically
crap, IMO.

What about the Sony Trinitron picture tubes used in computer monitors? Are
they crap as well?

In my experience, Sony tubes are about as good as they get.

 

[Halfgaar]

James Sweet wrote:

Where's he say anything about radiation?

I think I misinterpreted the word "emission"... Ignore me He obviously
meant light emission...

--
To send me, Halfgaar, email, remove remove from my email address.

 

[Bill Renfro]

He ment the cathode's ability to emit electrons.
50% is the point where most crt's no longer produce an acceptable picture.
When the emission reaches this point the tube is considered at the end of
it's life. How long it takes the tube to reach that point is what he ment
by 25,000 hours MTBF (Mean Time Before Failure). Life expectance is
measured in hours. MTBF is an average. Some last longer, and some not as
long.

Bill
Christian Technology

"Halfgaar" <voor_achter@yahoo.remove.com> wrote in message
news:br2qcn$egk$1@news1.tilbu1.nb.home.nl...

James Sweet wrote:

Where's he say anything about radiation?

I think I misinterpreted the word "emission"... Ignore me He obviously
meant light emission...

--
To send me, Halfgaar, email, remove remove from my email address.

 

[Halfgaar]

Bill Renfro wrote:

He ment the cathode's ability to emit electrons.
50% is the point where most crt's no longer produce an acceptable picture.
When the emission reaches this point the tube is considered at the end of
it's life. How long it takes the tube to reach that point is what he ment
by 25,000 hours MTBF (Mean Time Before Failure). Life expectance is
measured in hours. MTBF is an average. Some last longer, and some not as
long.

OK, I should have said electron emission, instead of light emission.

BTW, MTBF means "mean time between failure", not "..before failure". At
least, that what I've been tought.

--
To send me, Halfgaar, email, remove remove from my email address.