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Sony Black Trinitron 24" with weird colour (pink)

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Sony Black Trinitron 24" with weird colour (pink) Edu 08-07-2006
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Posted by Edu on August 7, 2006, 4:39 am
Hello!
I have a problem with a TV set.
The images are primarily pink. I have checked there is not green
colour, except for the black and shadow areas. I mean: In a RGB
pattern, red shows good, blue shows good, but green doesn't show, but,
all the black areas appear green. Also, when selecting another channel,
the short interval when the screen should be black in the mean, it is
green...

Another thing, there are several horizontal white thin lines, separated
about 1 centimeter.

The TV has been serviced 2 or 3 times, by non-very-trustable services.
They reported to have a wasted CRT. But I think a wasted CRT should
have problem in all the colors, right? And what about the retrace
lines?

I have electronics knowledge, but no tv repair experience at all,
although I teorically know all the blocks and modules inside.

What test/adjustments can I do?

Thanks in advance


AppliancePartsPros.com, Inc.
Posted by Mark D. Zacharias on August 7, 2006, 5:51 am
Edu wrote:
> Hello!
> I have a problem with a TV set.
> The images are primarily pink. I have checked there is not green
> colour, except for the black and shadow areas. I mean: In a RGB
> pattern, red shows good, blue shows good, but green doesn't show, but,
> all the black areas appear green. Also, when selecting another
> channel, the short interval when the screen should be black in the
> mean, it is green...
>
> Another thing, there are several horizontal white thin lines,
> separated about 1 centimeter.
>
> The TV has been serviced 2 or 3 times, by non-very-trustable services.
> They reported to have a wasted CRT. But I think a wasted CRT should
> have problem in all the colors, right? And what about the retrace
> lines?
>
> I have electronics knowledge, but no tv repair experience at all,
> although I teorically know all the blocks and modules inside.
>
> What test/adjustments can I do?
>
> Thanks in advance

Does sound like the CRT to me.

Mark Z.



Posted by Edu on August 7, 2006, 6:10 am
Ok, and assuming it's a CRT problem, is there any way to adjust to make
it last for, let's say, some months? Increasing screen grid should
improve something in this? I know it is a bit dangerous because it
might fasten the CRT distruction..., right?

Thanks!
Edu

Mark D. Zacharias ha escrito:

> Edu wrote:
> > Hello!
> > I have a problem with a TV set.
> > The images are primarily pink. I have checked there is not green
> > colour, except for the black and shadow areas. I mean: In a RGB
> > pattern, red shows good, blue shows good, but green doesn't show, but,
> > all the black areas appear green. Also, when selecting another
> > channel, the short interval when the screen should be black in the
> > mean, it is green...
> >
> > Another thing, there are several horizontal white thin lines,
> > separated about 1 centimeter.
> >
> > The TV has been serviced 2 or 3 times, by non-very-trustable services.
> > They reported to have a wasted CRT. But I think a wasted CRT should
> > have problem in all the colors, right? And what about the retrace
> > lines?
> >
> > I have electronics knowledge, but no tv repair experience at all,
> > although I teorically know all the blocks and modules inside.
> >
> > What test/adjustments can I do?
> >
> > Thanks in advance
>
> Does sound like the CRT to me.
>
> Mark Z.


Posted by Mark D. Zacharias on August 8, 2006, 6:55 am
Edu wrote:
> Ok, and assuming it's a CRT problem, is there any way to adjust to
> make it last for, let's say, some months? Increasing screen grid
> should improve something in this? I know it is a bit dangerous
> because it might fasten the CRT distruction..., right?
>
> Thanks!
> Edu
>
> Mark D. Zacharias ha escrito:
>
>> Edu wrote:
>>> Hello!
>>> I have a problem with a TV set.
>>> The images are primarily pink. I have checked there is not green
>>> colour, except for the black and shadow areas. I mean: In a RGB
>>> pattern, red shows good, blue shows good, but green doesn't show,
>>> but, all the black areas appear green. Also, when selecting another
>>> channel, the short interval when the screen should be black in the
>>> mean, it is green...
>>>
>>> Another thing, there are several horizontal white thin lines,
>>> separated about 1 centimeter.
>>>
>>> The TV has been serviced 2 or 3 times, by non-very-trustable
>>> services. They reported to have a wasted CRT. But I think a wasted
>>> CRT should have problem in all the colors, right? And what about
>>> the retrace lines?
>>>
>>> I have electronics knowledge, but no tv repair experience at all,
>>> although I teorically know all the blocks and modules inside.
>>>
>>> What test/adjustments can I do?
>>>
>>> Thanks in advance
>>
>> Does sound like the CRT to me.
>>
>> Mark Z.

A knowledgeable person could try adjusting thing like the crt drive and
cutoff adjustments. Might help a bit. In my experience Sony tubes don't fare
well in rejuvenation attempts - they often seem to die altogether.

Mark Z.



Posted by Edu on August 10, 2006, 8:37 am

> A knowledgeable person could try adjusting thing like the crt drive and
> cutoff adjustments. Might help a bit. In my experience Sony tubes don't fare
> well in rejuvenation attempts - they often seem to die altogether.

I'm not a knowledgeable person, but I can try...:-) The CRT drive is
the adjustable "screen" HV which comes from the FBT and goes to the CRT
board?
What is the cutoff adjustment? Is it something which cancels the ray
during retrace? Where can I find some adjustment for this?

The green colour instead of black is not an illusion. It is quite
strange. Where it should show green it shows grey, and where it should
show black it shows green... 8-|

Thanks for all the replies!

Eduardo


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