Sony KD32DX51 CRT tv colour problems

[Kroma]

Hi,

After having a perfect picture from day 1, my 4 year old Sony Wega
KD32DX51 CRT tv appears to have suddenly developed a fault.

Sometimes the picture is perfect but on some scenes, about half a second
to a second after the scene has changed on screen, the colour suddenly
either develops a peachy-pink tone or appears to over-saturate. It
depends on what the picture on-screen is. This is also occurring with
menus and on all video inputs.

Any advice on what is likely to be wrong, how it can be fixed, and how
much a repair is likely to be would be much appreciated.

Many thanks,

Kroma, UK

 

[William Sommerwerck]

Kroma

Kroma. You're kidding, right? Your sister is named Luma, no?

 

[William Sommerwerck]

Sometimes the picture is perfect but on some scenes,

about half a second to a second after the scene has
changed on screen, the colour suddenly either develops
a peachy-pink tone or appears to over-saturate. It
depends on what the picture on-screen is.

In what way?

This is also occurring with menus and on all video inputs.

That pretty much leaves out the color demodulator.

"Something" is wrong in (probably) the red amplification, or the red gun of
the CRT. You'll have to put a 'scope in the path and see what's fluctuating.

 

[Kroma]

In what way?

It's difficult to say but it is certainly worse when the picture is
brighter.

That pretty much leaves out the color demodulator.

"Something" is wrong in (probably) the red amplification, or the red gun of
the CRT. You'll have to put a 'scope in the path and see what's fluctuating.

Unfortunately I'm not brave enough to rummage inside a CRT tv and risk
death. Is this likely to be something that's easily fixed and would it
tend to be costly?

 

[William Sommerwerck]

"Something" is wrong in (probably) the red amplification,

Unfortunately I'm not brave enough to rummage inside a CRT
TV and risk death. Is this likely to be something that's easily
fixed and would it tend to be costly?

It's almost impossible to be electrocuted -- the HV can't deliver enough
current.

Most (but not all) TV repairs are quite simple -- the hard part is figuring
out what's wrong.

Most problems cannot be diagnosed at a distance -- even Dr House has to see
the patient. If I could tell you exactly what's wrong, while sitting at my
computer -- I'd be pulling down big bucks in the service business.

Either find a competent, honest service tech, or buy a new set.

 

[PeterD]

It's difficult to say but it is certainly worse when the picture is
brighter.


Unfortunately I'm not brave enough to rummage inside a CRT tv and risk
death. Is this likely to be something that's easily fixed and would it
tend to be costly?

Personally, I'd guess the latter. Finding service people today is
hard, good service people, almost impossible, reasonably priced
service people... Well, you get the picture. <g>

If you are unwilling to touch it inside, you are limited in what you
can do.

One thing might be to turn it off, unplug it, and let it sit for a few
days to allow any charged capacitors to discharge. Then open it and
reseat all the connectors you can find (carefully). That may help.

 

[Kroma]

After having a perfect picture from day 1, my 4 year old Sony Wega
KD32DX51 CRT tv appears to have suddenly developed a fault.

Sometimes the picture is perfect but on some scenes, about half a second
to a second after the scene has changed on screen, the colour suddenly
either develops a peachy-pink tone or appears to over-saturate. It
depends on what the picture on-screen is. This is also occurring with
menus and on all video inputs.

Thank you for the advice.

Next question - is it possible for a bad CRT to get better with time? 2
weeks on and the fault isn't nearly as noticeable now, and it's not just
because I've got used to it!


Kroma