10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles down 5 mins later. During the day, a couple of times I see an amber coloured "thin line flash" and hear a crack/pop noise. Tube is probably going.

Is this dangerous? Got kids around ATM. Don't want the telly exploding. Also, can it be fixed, or shall I get a flat screen TV? Don't want to spend much, any bargain recommendations please?

Thanks a lot.

On 09/08/11 21:13, rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles down 5 mins later. During the day, a couple of times I see an amber coloured "thin line flash" and hear a crack/pop noise. Tube is probably going.

Is this dangerous? Got kids around ATM. Don't want the telly exploding. Also, can it be fixed, or shall I get a flat screen TV? Don't want to spend much, any bargain recommendations please?

There's a slim chance of a catastrophic failure with smoke and flames.
If you switch it off overnight you should be OK but it's probably time
to look for a replacement.

In theory your TV is repairable but if it was mine I'd replace it. A TV
that crackles and pops is probably overheating some components which
might well fail soon after you get the set repaired. In any case the
repair will cost you a significant fraction of the cost of a new
flatscreen TV and you would be without a TV while the repair was done.


--
Bernard Peek

10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles
down 5 mins later. During the day, a couple of times I see an amber
coloured "thin line flash" and hear a crack/pop noise. Tube is probably
going.


There's a slim chance of a catastrophic failure with smoke and flames.
If you switch it off overnight you should be OK but it's probably time
to look for a replacement.

In theory your TV is repairable but if it was mine I'd replace it. A TV
that crackles and pops is probably overheating some components which
might well fail soon after you get the set repaired. In any case the
repair will cost you a significant fraction of the cost of a new
flatscreen TV and you would be without a TV while the repair was done.

Or it's the flyback going, could be something as simple as the flyback's
lead has worn insulation, hence the cracking noises you hear as it arcs to
the chassis, or bad solder joints.

but to be honnest, unless you know how to discharge a crt, and are happy
poking around something with 20,000 or so volts on it, get someone who knows
what he's doing to do it, thats if there are any real tv repair men left,
modern lcd and plasma TV's are 'repaired' by substituting boards,

if you have a tv repair shop near you, and they still work on crt's, take it
down, they usually give you a free diagnosis, and if it is the flyback, it
shouldent be too expensive to have replaced (i have a 25 inch monitor in a
video games machine, hantarex polo 2.... anyone who knows them will know the
flyback is the weak point on them, and it's about 20 quid for a new one)

On Tue, 09 Aug 2011 21:36:01 +0100, Bernard Peek
wrote:

On 09/08/11 21:13, rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles down 5 mins later. During the day, a couple of times I see an amber coloured "thin line flash" and hear a crack/pop noise. Tube is probably going.

Is this dangerous? Got kids around ATM. Don't want the telly exploding. Also, can it be fixed, or shall I get a flat screen TV? Don't want to spend much, any bargain recommendations please?

There's a slim chance of a catastrophic failure with smoke and flames.


Only with a set alight TV.

:-)
--
Frank Erskine

On Tue, 9 Aug 2011 22:25:09 +0100, Gazz wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles
down 5 mins later. During the day, a couple of times I see an amber
coloured "thin line flash" and hear a crack/pop noise. Tube is probably
going.


There's a slim chance of a catastrophic failure with smoke and flames.
If you switch it off overnight you should be OK but it's probably time
to look for a replacement.

In theory your TV is repairable but if it was mine I'd replace it. A TV
that crackles and pops is probably overheating some components which
might well fail soon after you get the set repaired. In any case the
repair will cost you a significant fraction of the cost of a new
flatscreen TV and you would be without a TV while the repair was done.

Or it's the flyback going, could be something as simple as the flyback's
lead has worn insulation, hence the cracking noises you hear as it arcs to
the chassis, or bad solder joints.

This is what happened to my old TV. It was quite spectacular and smelly.
I'm glad though that there was someone around to switch it off when the
smoke started to appear. if there had been a build-up of dust inside the
cabinet things might have been different.

but to be honnest, unless you know how to discharge a crt, and are happy
poking around something with 20,000 or so volts on it, get someone who knows
what he's doing to do it, thats if there are any real tv repair men left,
modern lcd and plasma TV's are 'repaired' by substituting boards,

if you have a tv repair shop near you, and they still work on crt's, take it
down, they usually give you a free diagnosis, and if it is the flyback, it
shouldent be too expensive to have replaced (i have a 25 inch monitor in a
video games machine, hantarex polo 2.... anyone who knows them will know the
flyback is the weak point on them, and it's about 20 quid for a new one)

I doubt there's any economic reason to repair a CRT telly these days. They're
given away on freecycle and lots go unsold on the bay. Spend a tenner and
buy yourself half a dozen replacements

"Gazz" wrote in message ...
10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles down 5 mins later. During the day, a couple of times
I see an amber coloured "thin line flash" and hear a crack/pop noise. Tube is probably going.


There's a slim chance of a catastrophic failure with smoke and flames.
If you switch it off overnight you should be OK but it's probably time
to look for a replacement.

In theory your TV is repairable but if it was mine I'd replace it. A TV
that crackles and pops is probably overheating some components which
might well fail soon after you get the set repaired. In any case the
repair will cost you a significant fraction of the cost of a new
flatscreen TV and you would be without a TV while the repair was done.

Or it's the flyback going, could be something as simple as the flyback's lead has worn insulation, hence the cracking noises you
hear as it arcs to the chassis, or bad solder joints.

but to be honnest, unless you know how to discharge a crt, and are happy poking around something with 20,000 or so volts on it,
get someone who knows what he's doing to do it, thats if there are any real tv repair men left, modern lcd and plasma TV's are
'repaired' by substituting boards,

if you have a tv repair shop near you, and they still work on crt's, take it down, they usually give you a free diagnosis, and if
it is the flyback, it shouldent be too expensive to have replaced (i have a 25 inch monitor in a video games machine, hantarex
polo 2.... anyone who knows them will know the flyback is the weak point on them, and it's about 20 quid for a new one)
Line Output Transformer
LOPTX (pron. Loptex)
LOPTY
Line Tranny
But please, not flyback.
Flyback transformer if you must, but not flyback. Not unless you are a merkin ;-)

--
Graham.

%Profound_observation%

In article
,
rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then
settles down 5 mins later. During the day, a couple of times I see an
amber coloured "thin line flash" and hear a crack/pop noise. Tube is
probably going.

Is this dangerous? Got kids around ATM. Don't want the telly
exploding. Also, can it be fixed, or shall I get a flat screen TV?
Don't want to spend much, any bargain recommendations please?

Thanks a lot.

Have you got a local FreeCycle group? This one is awash with good working
CRT sets. All makes and sizes. Often several a day.

--
*Where there's a will, I want to be in it.

Dave Plowman London SW
To e-mail, change noise into sound.

On Wed, 10 Aug 2011 00:45:05 +0100, "Graham." wrote:

Line Output Transformer
LOPTX (pron. Loptex)
LOPTY
Line Tranny
But please, not flyback.
Flyback transformer if you must, but not flyback. Not unless you are a merkin ;-)

+1

"Dave Plowman (News)" wrote in message
...

In article
,
rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then
settles down 5 mins later. During the day, a couple of times I see an
amber coloured "thin line flash" and hear a crack/pop noise. Tube is
probably going.

Is this dangerous? Got kids around ATM. Don't want the telly
exploding. Also, can it be fixed, or shall I get a flat screen TV?
Don't want to spend much, any bargain recommendations please?

Thanks a lot.

A CRT Colour TV is a marvel of technology. I guess we have almost lost the
means of even making the tubes now.
Cue: Cadbury Smash Alien, "So you fire an electron beam through a hole in a
mask to make a phosphor spot glow....."

In article ,
Graham. writes

Line Output Transformer
LOPTX (pron. Loptex)
LOPTY
Line Tranny
But please, not flyback.
Flyback transformer if you must, but not flyback. Not unless you are a merkin

Strictly speaking, LOPTs and flybacks are two different things.

LOPTs refer to an older design where the line output stage was boosted
to about 9kV by a conventional wound transformer, and again to about
28kV by a device called a tripler to produce the final anode voltage.

There's a pic of this arrangement he

http://tinyurl.com/42sm8tg
http://tinyurl.com/3e3schw

in the first image, the green box-shaped object is the tripler, in the
second, it's blue.

In both cases, the line output transformer is the wound device next to
the tripler.

Flybacks refer to an all-in-one unit which eliminates the separate
first-stage transformer, such as this:

http://electronicrepairguide.com/fly...ansformer.html

--
(\__/)
(='.'=)
(")_(")

"Mike Tomlinson" wrote in message ...
In article ,
Graham. writes

Line Output Transformer
LOPTX (pron. Loptex)
LOPTY
Line Tranny
But please, not flyback.
Flyback transformer if you must, but not flyback. Not unless you are a merkin

Strictly speaking, LOPTs and flybacks are two different things.

LOPTs refer to an older design where the line output stage was boosted
to about 9kV by a conventional wound transformer, and again to about
28kV by a device called a tripler to produce the final anode voltage.

There's a pic of this arrangement he

http://tinyurl.com/42sm8tg
http://tinyurl.com/3e3schw

in the first image, the green box-shaped object is the tripler, in the
second, it's blue.

In both cases, the line output transformer is the wound device next to
the tripler.

Flybacks refer to an all-in-one unit which eliminates the separate
first-stage transformer, such as this:

http://electronicrepairguide.com/fly...ansformer.html


I would have put it the other way round ie. all in one unit that eliminates the separate tripler,
but I still don't totally agree with distinction as to what constitutes a flyback transformer
although I concur that manufacturers can apply any label they chose for their components.

TV EHT circuitry has been described as flyback derived EHT since they stopped making
sets with separate oil filled mains energised EHT transformers in the 1950s

What I was objecting to was the word "flyback" used by itself like that, which is an American
infiltration to our language which we must all guard against. Right?


--
Graham. GTVR (and successors) 1971-1990

%Profound_observation%

"Dave Plowman (News)" wrote in message ...
In article
,
rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then
settles down 5 mins later. During the day, a couple of times I see an
amber coloured "thin line flash" and hear a crack/pop noise. Tube is
probably going.

Is this dangerous? Got kids around ATM. Don't want the telly
exploding. Also, can it be fixed, or shall I get a flat screen TV?
Don't want to spend much, any bargain recommendations please?

Thanks a lot.

Have you got a local FreeCycle group? This one is awash with good working
CRT sets. All makes and sizes. Often several a day.


We have a British Heart Foundation charty shop in an old Woolworths
building. Nice display of working CRTs in various sizes.

--
Graham.

%Profound_observation%

In article ,
Graham. writes

but I still don't totally agree with distinction as to what constitutes a
flyback transformer

I think it's become a generic term for any line output stage, much like
'hoover'.

What I was objecting to was the word "flyback" used by itself like
that, which is an American infiltration to our language which we must
all guard against. Right?

Right on, brother.

Although a woman I used to work with in monitor repair called them
"flys", which I found even more grating.

--
(\__/)
(='.'=)
(")_(")

In article ,
Graham. wrote:
Have you got a local FreeCycle group? This one is awash with good
working CRT sets. All makes and sizes. Often several a day.


We have a British Heart Foundation charty shop in an old Woolworths
building. Nice display of working CRTs in various sizes.

Indeed. It makes it not worth the bother having one fixed. Unless it is
very special.

--
*Middle age is when work is a lot less fun - and fun a lot more work.

Dave Plowman London SW
To e-mail, change noise into sound.

Thanks a lot for everyone's interesting replies. I had a careful think about all the suggested options, and decided to get a new flatscreen TV. I got it from a local PC World store, and it cost £250. It's a 32" Toshiba. The image quality is perfectly acceptable. The sound is tinny compared to the "meatier" old Sony tube based TV I had, but that is to be expected. I'm not bothered - it sounds clear enough. Generally speaking, I am pleased with it.

I understand that flat screen TVs use less electricity than old tube based TVs, so perhaps I should think about this as a cost saving investment. Also, the old failing TV is so heavy that I didn't really fancy farting about getting it to a repair shop. But I've got to stick it in the car at some point, to take it to the local recycling centre...I'd rather dump it, because if it is faulty and potentially dangerous, I don't want some unsuspecting person plugging it in and it catch fire.

cdr wrote:
Thanks a lot for everyone's interesting replies. I had a careful think about all the suggested options, and decided to get a new flatscreen TV. I got it from a local PC World store, and it cost £250. It's a 32" Toshiba. The image quality is perfectly acceptable. The sound is tinny compared to the "meatier" old Sony tube based TV I had, but that is to be expected. I'm not bothered - it sounds clear enough. Generally speaking, I am pleased with it.

I understand that flat screen TVs use less electricity than old tube based TVs,

They don't really. A phosphor screen is a sort of fluorescent tube, so
is the backlight on most LCD's...and the screen uses less power when its
'fark' - the LCD does not.



so perhaps I should think about this as a cost saving investment.

Also, the old failing TV is so heavy that I didn't really fancy farting about getting it to a repair shop.
But I've got to stick it in the car at some point, to take it to the
local recycling centre...
I'd rather dump it, because if it is faulty and potentially dangerous,
I don't want some unsuspecting person plugging it in and it catch fire.

On Wed, 10 Aug 2011 07:54:24 -0700, cdr wrote:

Thanks a lot for everyone's interesting replies. I had a careful think
about all the suggested options, and decided to get a new flatscreen TV.
I got it from a local PC World store, and it cost £250.

It'll be interesting to see if it lasts ten years, I suppose.

I understand that flat screen TVs use less electricity than old tube
based TVs, so perhaps I should think about this as a cost saving
investment.

I'm not sure that it makes much difference - the modern TV might even be
worse.

I'd rather dump it, because if it is faulty and potentially
dangerous, I don't want some unsuspecting person plugging it in and it
catch fire.

Cut the power cable off - anyone with half a brain will take that to mean
that there might be something wrong with it, even if they do end up with
it somehow.

cheers

Jules

On Aug 9, 9:13*pm, rpgs rock dvds wrote:
10 y.o. CRT, switch it on in the morning, it flickers a lot, then settles down 5 mins later. *During the day, a couple of times I see an amber coloured "thin line flash" and hear a crack/pop noise. *Tube is probably going.

Is this dangerous? *Got kids around ATM. *Don't want the telly exploding. *Also, can it be fixed, or shall I get a flat screen TV? *Don't want to spend much, any bargain recommendations please?

Thanks a lot.

The problem is arcing somewhere. Sometimes it can be fixed with
nothing more than taking the back off and blowing the dust out. I'd
recmmend doing that outside though.


NT