Shadow on LCD TV

C

Chris Bartram

Guest
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?
 
"Chris Bartram" <news@delete-me.piglet-net.net> wrote in message
news:hivi8e$j9v$1@news.eternal-september.org...
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?
Click to expand...

Maybe it's a ghost or poltergeist.

Shaun
 
Chris Bartram wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?
do you smoke?
Click to expand...
 
mike wrote:
Chris Bartram wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side
of the picture- it's blobby. It only rally shows against bright
primary colours (eg: it looks worst on the The Simposons) and isn't
that noticeable on a white bacground.

Any ideas? Dirt ona backlight?
do you smoke?
No. Seems it's not uncommon, after a google, but the bad news is that
Click to expand...
the display panel and lamps are one unit.
 
Shaun wrote:
"Chris Bartram" <news@delete-me.piglet-net.net> wrote in message
news:hivi8e$j9v$1@news.eternal-september.org...
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?


Maybe it's a ghost or poltergeist.

Shaun




I tried cleaning the screen with a microfibre cloth slightly dampened in
Click to expand...
holy water, and no difference, and the house isn't on a graveyard, so I
think maybe not.
 
On 17/01/2010 17:43, Chris Bartram wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?
Click to expand...
Poor analogue signal (deteriorating aerial signal over the years, water
and ice ingress in the cable?) and use of an over the top transient
improvement sharpening circuit can give these effects.

Does this happen on DVD or digital source playback?

--
Adrian C
 
Adrian C wrote:
On 17/01/2010 17:43, Chris Bartram wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?

Poor analogue signal (deteriorating aerial signal over the years, water
and ice ingress in the cable?) and use of an over the top transient
improvement sharpening circuit can give these effects.

Does this happen on DVD or digital source playback?

It's there on all sources (internal freeview, internal analogue,
Click to expand...
external cable box, DVD) and looks like a static (as in non-moving)
blotch on the screen-it doesn't move with any objects on the sreen.

It looks a *little* bit like when a CRT needs degaussing, but not exactly.
 
It's possible for LCD cells to "jam" on or off. That might be what it is.
(One of my monitors where I last worked had this problem.) There is freeware
that "exercises" LCD pixels to reverse this.
 
On Jan 17, 9:43 am, Chris Bartram <n...@delete-me.piglet-net.net>
wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?
Click to expand...
Nonuniform backlighting can be caused by any kind of warping of the
plastic 'sandwich' construction that includes the diffusion screen.
Basically, nothing short of a rebuild of the screen will undo the
problem.
You can try applying gentle pressure (maybe something will shift back
into position) but your best bet would be to not watch the Simpsons
on this TV.
 
whit3rd wrote:
On Jan 17, 9:43 am, Chris Bartram <n...@delete-me.piglet-net.net
wrote:
My 3-4 year old Samsung LCD TV has developed a shadow on the RD side of
the picture- it's blobby. It only rally shows against bright primary
colours (eg: it looks worst on the The Simposons) and isn't that
noticeable on a white bacground.

Any ideas? Dirt ona backlight?

Nonuniform backlighting can be caused by any kind of warping of the
plastic 'sandwich' construction that includes the diffusion screen.
Basically, nothing short of a rebuild of the screen will undo the
problem.
Click to expand...
Bugger. That sounds *very* likely: the shadow looks like the effect
you'd have if 2 parts of the sandwich were unevenly spaced.

You can try applying gentle pressure (maybe something will shift back
into position)
Click to expand...
Maybe :)

but your best bet would be to not watch the Simpsons
on this TV.
Click to expand...
:-(

It's the only TV with cable, and the shadow is becoming noticeable on
other programmes. It's slowly getting worse, I think.
 
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