Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old
which has developed a green tint to the picture.

It's even noticeable on blank black backgrounds and I would like to have
a go at fixing the problem. Has anyone got any experience of this model
and any hints as to where to start please?
--
Bob Hardwell

In article ,
Bob Hardwell wrote:
Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old
which has developed a green tint to the picture.

Am I right in saying it's a CRT TV? If so this is very common. The tube is
aging and the red gun is losing output.

It's even noticeable on blank black backgrounds and I would like to have
a go at fixing the problem. Has anyone got any experience of this model
and any hints as to where to start please?

CRT sets usually have two sets of controls to adjust the colour balance -
foreground (whites) and background (blacks). Again, the background
changing before the foreground is common with age.

At one time there would be internal pre-sets to adjust this balance called
grey scale adjustment. On newer sets it is usually software controlled via
an engineering menu. How you get into it on your set I've no idea.
A Google on that might help.

--
*Laugh alone and the world thinks you're an idiot.

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

"Bob Hardwell" wrote in message
...
Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old which
has developed a green tint to the picture.

It's even noticeable on blank black backgrounds and I would like to have a
go at fixing the problem. Has anyone got any experience of this model and
any hints as to where to start please?
--
Bob Hardwell

The tube has gone. I had this exact same TV, at 4 years and 10 months it
developed the same problem. As it was still 2 months within warranty I git
them in to fix it and they replaced the tube. I had to wait quite a while
for a replacement but it was as good as new when done. I would guess it's
not really economical to repair if you have to pay for repairs yourself.

At one time there would be internal pre-sets to adjust this balance called
grey scale adjustment. On newer sets it is usually software controlled via
an engineering menu. How you get into it on your set I've no idea.
A Google on that might help.

http://eserviceinfo.com might be of use, has loads of manuals
available for free download

In article ,
Angela wrote:
Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old
which has developed a green tint to the picture.

It's even noticeable on blank black backgrounds and I would like to
have a go at fixing the problem. Has anyone got any experience of
this model and any hints as to where to start please? -- Bob Hardwell

The tube has gone. I had this exact same TV, at 4 years and 10 months
it developed the same problem. As it was still 2 months within
warranty I git them in to fix it and they replaced the tube. I had to
wait quite a while for a replacement but it was as good as new when
done. I would guess it's not really economical to repair if you have
to pay for repairs yourself.

If it's a green *tint* then it should be adjustable. As I said all tubes
age, and the red gun losing emissions is the first sign. Trinitron tubes
are notorious for it.

If, however, there is no red at all then the tube might well have failed.
But the Op suggested the 'whites. are ok - only the 'blacks' showing the
problem.

--
*Remember not to forget that which you do not need to know.*

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

In message , Colin
Wilson o.uk writes
At one time there would be internal pre-sets to adjust this balance called
grey scale adjustment. On newer sets it is usually software controlled via
an engineering menu. How you get into it on your set I've no idea.
A Google on that might help.

http://eserviceinfo.com might be of use, has loads of manuals
available for free download

I typed a few model numbers in - they all cost

--
geoff

In message , "Dave Plowman (News)"
writes
In article ,
Bob Hardwell wrote:
Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old
which has developed a green tint to the picture.

Am I right in saying it's a CRT TV? If so this is very common. The tube is
aging and the red gun is losing output.

It's even noticeable on blank black backgrounds and I would like to have
a go at fixing the problem. Has anyone got any experience of this model
and any hints as to where to start please?

CRT sets usually have two sets of controls to adjust the colour balance -
foreground (whites) and background (blacks). Again, the background
changing before the foreground is common with age.

At one time there would be internal pre-sets to adjust this balance called
grey scale adjustment. On newer sets it is usually software controlled via
an engineering menu. How you get into it on your set I've no idea.
A Google on that might help.


Thanks Dave, it is a CRT. You inadvertently solved the problem. Your
comments gave me something to track down i.e. Service Menus and I found:

http://www.stevelarkins.freeuk.com/tvtools.htm

Which covers the exact problem I'm having and how correct it.

It is ageing of the tube as you and others suggested and I managed to
cure the problem in 5 minutes using Steve Larkins' notes so thanks one
and all.
--
Bob Hardwell

In article ,
Bob Hardwell wrote:
It is ageing of the tube as you and others suggested and I managed to
cure the problem in 5 minutes using Steve Larkins' notes so thanks one
and all.

Just to say even although it is aging it could last for many more years
with just the occasional adjustment.

--
*I'm not as think as you drunk I am.

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

Dave Plowman (News) wrote:
In article ,
Angela wrote:

Hi, I have a Toshiba 28W8DBA widescreen television about 6 years old
which has developed a green tint to the picture.

It's even noticeable on blank black backgrounds and I would like to
have a go at fixing the problem. Has anyone got any experience of
this model and any hints as to where to start please? -- Bob Hardwell

The tube has gone. I had this exact same TV, at 4 years and 10 months
it developed the same problem. As it was still 2 months within
warranty I git them in to fix it and they replaced the tube. I had to
wait quite a while for a replacement but it was as good as new when
done. I would guess it's not really economical to repair if you have
to pay for repairs yourself.

If it's a green *tint* then it should be adjustable. As I said all tubes
age, and the red gun losing emissions is the first sign. Trinitron tubes
are notorious for it.

If, however, there is no red at all then the tube might well have failed.
But the Op suggested the 'whites. are ok - only the 'blacks' showing the
problem.

Since the whites are fine but the _blacks_ are tinted, its clearly
not
a tube problem, but a video drive issue.

The OP would do well to ask an electronics group, eg
sci.electronics.repair. This is a DIY group, ask about electronics at
your peril.


NT

In article
,
wrote:
If, however, there is no red at all then the tube might well have
failed. But the Op suggested the 'whites. are ok - only the 'blacks'
showing the problem.

Since the whites are fine but the _blacks_ are tinted, its clearly
not
a tube problem, but a video drive issue.

The OP would do well to ask an electronics group, eg
sci.electronics.repair. This is a DIY group, ask about electronics at
your peril.

You've not read the replies, then, and the satisfactory outcome?

And you're just about as likely to get an answer about such general things
here as anywhere else.

--
*The more I learn about women, the more I love my car

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

In message , "Dave Plowman (News)"
writes
In article
,
wrote:
If, however, there is no red at all then the tube might well have
failed. But the Op suggested the 'whites. are ok - only the 'blacks'
showing the problem.

Since the whites are fine but the _blacks_ are tinted, its clearly
not
a tube problem, but a video drive issue.

The OP would do well to ask an electronics group, eg
sci.electronics.repair. This is a DIY group, ask about electronics at
your peril.

You've not read the replies, then, and the satisfactory outcome?

And you're just about as likely to get an answer about such general things
here as anywhere else.

You are right Dave. I have found this group extremely useful over the
years, mainly as a lurker but, in my case, I have had 2 definite results
in the last week alone.

At least you get practical suggestions without all the science, unless
you want it of course!

TV's still working well.
--
Bob Hardwell

On 2008-05-26 14:17:03 +0100, "Dave Plowman (News)"
said:

In article
,
wrote:
If, however, there is no red at all then the tube might well have
failed. But the Op suggested the 'whites. are ok - only the 'blacks'
showing the problem.

Since the whites are fine but the _blacks_ are tinted, its clearly
not
a tube problem, but a video drive issue.

The OP would do well to ask an electronics group, eg
sci.electronics.repair. This is a DIY group, ask about electronics at
your peril.

You've not read the replies, then, and the satisfactory outcome?

And you're just about as likely to get an answer about such general things
here as anywhere else.

I also have a Toshiba CRT TV of this series, but not this model, that
has tended towards a muddy green colour on blacks for a while.

A tweak to the green cut off and a little to the red has fixed it very
effectively.

I was aware that there was an incantation to get into the engineering
menu but had never bothered to look for it (lack of tuits). Having
read this article, it became annoying so I had to fix it.

I know who knows about electronics here, who knows about RF stuff, who
knows about audio, who knows about cleaning machines and so on.

In almost all cases, the suggestions are good.

In article 483bc359@qaanaaq,
Andy Hall wrote:
And you're just about as likely to get an answer about such general things
here as anywhere else.

I also have a Toshiba CRT TV of this series, but not this model, that
has tended towards a muddy green colour on blacks for a while.

A tweak to the green cut off and a little to the red has fixed it very
effectively.

I was aware that there was an incantation to get into the engineering
menu but had never bothered to look for it (lack of tuits). Having
read this article, it became annoying so I had to fix it.

I know who knows about electronics here, who knows about RF stuff, who
knows about audio, who knows about cleaning machines and so on.

In almost all cases, the suggestions are good.

Indeed. You may well get more answers on one of the specialist groups but
that usually means more wrong answers too.

--
*Oh, what a tangled website we weave when first we practice *

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