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Dark patch on screen.
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Rick
Jun 29, 2013, 7:36:35 AM6/29/13
to
A friend of mine owns a 37" Philips 1080P LCD TV, it's recently developed a
problem in the form of a large dark smoky patch which has appeared on the
left hand side, it's not dead pixels because the picture and correct colours
are still definable underneath, also it's not any substance on the outside
of the screen, he lives in a well kept modern house with central heating and
isn't a smoker, the Dropbox photos are best I could with a not very good
camera, but will at least provide an idea of the problem.
BTW, he bought two Philips receivers after seeing mine (a 37" 1080i which
admittedly does deliver excellent pictures) IMV a big mistake because of the
abysmal software, both his receivers are now running on external STBs
because of various software problems, which as far as I'm aware Philips
never did anything to try and rectify with even a single over the air
upgrade.
<https://dl.dropboxusercontent.com/u/11815200/DSCF1138.jpg>
<https://dl.dropboxusercontent.com/u/11815200/DSCF1139.jpg>
<https://dl.dropboxusercontent.com/u/11815200/DSCF1140.jpg>
problem in the form of a large dark smoky patch which has appeared on the
left hand side, it's not dead pixels because the picture and correct colours
are still definable underneath, also it's not any substance on the outside
of the screen, he lives in a well kept modern house with central heating and
isn't a smoker, the Dropbox photos are best I could with a not very good
camera, but will at least provide an idea of the problem.
BTW, he bought two Philips receivers after seeing mine (a 37" 1080i which
admittedly does deliver excellent pictures) IMV a big mistake because of the
abysmal software, both his receivers are now running on external STBs
because of various software problems, which as far as I'm aware Philips
never did anything to try and rectify with even a single over the air
upgrade.
<https://dl.dropboxusercontent.com/u/11815200/DSCF1138.jpg>
<https://dl.dropboxusercontent.com/u/11815200/DSCF1139.jpg>
<https://dl.dropboxusercontent.com/u/11815200/DSCF1140.jpg>
Woody
Jun 29, 2013, 12:56:36 PM6/29/13
to
"Rick" <ri...@nowhere.com> wrote in message
news:7Fzzt.637$0q7...@fx33.am4...
Looks like a backlight failure. Ouch! Expensive unless it is less
than a few years old as there could be a claim under SoGA as
unfit for purpose.
--
Woody
harrogate three at ntlworld dot com
news:7Fzzt.637$0q7...@fx33.am4...
> A friend of mine owns a 37" Philips 1080P LCD TV, it's recently
> developed a problem in the form of a large dark smoky patch
> which has appeared on the left hand side, it's not dead pixels
> because the picture and correct colours are still definable
> underneath, also it's not any substance on the outside of the
> screen, he lives in a well kept modern house with central
> heating and isn't a smoker, the Dropbox photos are best I could
> with a not very good camera, but will at least provide an idea
> of the problem.
>
[snip]
> developed a problem in the form of a large dark smoky patch
> which has appeared on the left hand side, it's not dead pixels
> because the picture and correct colours are still definable
> underneath, also it's not any substance on the outside of the
> screen, he lives in a well kept modern house with central
> heating and isn't a smoker, the Dropbox photos are best I could
> with a not very good camera, but will at least provide an idea
> of the problem.
>
Looks like a backlight failure. Ouch! Expensive unless it is less
than a few years old as there could be a claim under SoGA as
unfit for purpose.
--
Woody
harrogate three at ntlworld dot com
Rick
Jun 29, 2013, 1:20:56 PM6/29/13
to
"Woody" <harro...@ntlworld.com> wrote in message
news:kqn3a0$p06$1...@dont-email.me...
not that badly off and appears to be quite happy to purchase a new TV, I've
told him to go for a 40 inch LED (backlight) Samsung from John Lewis with a
five year warranty.
Brian Gaff
Jun 29, 2013, 2:14:41 PM6/29/13
to
Or a panasonic. I've a few friends with these with no reliability issues.
obviously I cannot tell myself, but oh speakers in modern tellies.. crap.
Brian
--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email: bri...@blueyonder.co.uk
______________________________________________________________________________________________________________
news:THEzt.3776$Lt5....@fx21.am4...
obviously I cannot tell myself, but oh speakers in modern tellies.. crap.
Brian
--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email: bri...@blueyonder.co.uk
______________________________________________________________________________________________________________
news:THEzt.3776$Lt5....@fx21.am4...
Ian Field
Jun 29, 2013, 4:36:39 PM6/29/13
to
R. Mark Clayton
Jun 29, 2013, 4:44:18 PM6/29/13
to
> A friend of mine owns a 37" Philips 1080P LCD TV, it's recently developed
> a problem in the form of a large dark smoky patch which has appeared on
> the left hand side, it's not dead pixels because the picture and correct
> colours are still definable underneath, also it's not any substance on the
> outside of the screen, he lives in a well kept modern house with central
> heating and isn't a smoker, the Dropbox photos are best I could with a not
> very good camera, but will at least provide an idea of the problem.
Reads like a backlight failure.
> a problem in the form of a large dark smoky patch which has appeared on
> the left hand side, it's not dead pixels because the picture and correct
> colours are still definable underneath, also it's not any substance on the
> outside of the screen, he lives in a well kept modern house with central
> heating and isn't a smoker, the Dropbox photos are best I could with a not
> very good camera, but will at least provide an idea of the problem.
>
> BTW, he bought two Philips receivers after seeing mine (a 37" 1080i which
> admittedly does deliver excellent pictures) IMV a big mistake because of
> the abysmal software, both his receivers are now running on external STBs
> because of various software problems, which as far as I'm aware Philips
> never did anything to try and rectify with even a single over the air
> upgrade.
drive.
OTOH they did not fix the aspect ratio problem on mine and after the third
version and it STILL cropped CNN & Bloomberg tickers it went back (courtesy
of Richer Sounds who have better CS in their little finger)
Paul D Smith
Jul 1, 2013, 3:18:48 AM7/1/13
to
"Rick" wrote in message news:7Fzzt.637$0q7...@fx33.am4...
A friend of mine owns a 37" Philips 1080P LCD TV, it's recently developed a
problem in the form of a large dark smoky patch which has appeared on the
left hand side...
...snip...
Interesting. I got something not as obvious from my last Panasonic. At the
same time there was clearly some black deposit at the bottom corners of the
screen. It looked to me like the white reflective (?) panel behind the
screen had degraded and flaked off in places meaning that the backlight was
not being reflected (?) through that part of the screen.
Fortunately I bought from John Lewis, but given the age of your friend's
set, I wonder if a panel manufacturer was having a bad year and there are
more of these about?
Paul DS.
A friend of mine owns a 37" Philips 1080P LCD TV, it's recently developed a
problem in the form of a large dark smoky patch which has appeared on the
...snip...
Interesting. I got something not as obvious from my last Panasonic. At the
same time there was clearly some black deposit at the bottom corners of the
screen. It looked to me like the white reflective (?) panel behind the
screen had degraded and flaked off in places meaning that the backlight was
not being reflected (?) through that part of the screen.
Fortunately I bought from John Lewis, but given the age of your friend's
set, I wonder if a panel manufacturer was having a bad year and there are
more of these about?
Paul DS.
Norman Wells
Jul 1, 2013, 3:31:13 AM7/1/13
to
queried the cause of an irregular smoky patch on a television in a bar,
the reason given to me was that the cleaner had been a bit too vigorous
in trying to clean grease off the screen and had rubbed it rather too
hard. It sounded plausible.
Paul D Smith
Jul 1, 2013, 5:38:39 AM7/1/13
to
...snip...
I can assure you that wasn't the case on my set. If you had looked closely
you could clearly discern that the "patch" was BEHIND the LCDs and was not
on the screen.
OTOH you should have been the state of the loaner that I was given whilst
they decided whether to fix or junk my old Panasonic. Apparently it had
been in a home fully of "boisterous" children including one who decided to
draw on the screen in crayon. I managed to gently clean the crayon and
other dirt off screen but could do nothing with the various scratches and
gouges. The repair guy was both pleased to see the screen much cleaner, but
saddened to find out that the scratches he feared were there, really were.
I suspect the answer may be rather more mindane than that. When I
queried the cause of an irregular smoky patch on a television in a bar,
the reason given to me was that the cleaner had been a bit too vigorous
in trying to clean grease off the screen and had rubbed it rather too
hard. It sounded plausible.
+++++++++
queried the cause of an irregular smoky patch on a television in a bar,
the reason given to me was that the cleaner had been a bit too vigorous
in trying to clean grease off the screen and had rubbed it rather too
hard. It sounded plausible.
I can assure you that wasn't the case on my set. If you had looked closely
you could clearly discern that the "patch" was BEHIND the LCDs and was not
on the screen.
OTOH you should have been the state of the loaner that I was given whilst
they decided whether to fix or junk my old Panasonic. Apparently it had
been in a home fully of "boisterous" children including one who decided to
draw on the screen in crayon. I managed to gently clean the crayon and
other dirt off screen but could do nothing with the various scratches and
gouges. The repair guy was both pleased to see the screen much cleaner, but
saddened to find out that the scratches he feared were there, really were.
Gary
Jul 1, 2013, 8:37:57 AM7/1/13
to
the snow with bad analogue TV and cleared a lot when we got a digital
feed. I have seen several reports of this type of staining and from
more than one manufacturer.
Ian Field
Jul 1, 2013, 12:20:59 PM7/1/13
to
"Paul D Smith" <paul_d...@hotmail.com> wrote in message
news:kqricp$tdj$1...@dont-email.me...
> ...snip...
> I suspect the answer may be rather more mindane than that. When I
> queried the cause of an irregular smoky patch on a television in a bar,
> the reason given to me was that the cleaner had been a bit too vigorous
> in trying to clean grease off the screen and had rubbed it rather too
> hard. It sounded plausible.
> +++++++++
> I can assure you that wasn't the case on my set. If you had looked
> closely you could clearly discern that the "patch" was BEHIND the LCDs and
> was not on the screen.
Some types of LCD screen have a light polarising film on front & back of the
> I suspect the answer may be rather more mindane than that. When I
> queried the cause of an irregular smoky patch on a television in a bar,
> the reason given to me was that the cleaner had been a bit too vigorous
> in trying to clean grease off the screen and had rubbed it rather too
> hard. It sounded plausible.
> +++++++++
> I can assure you that wasn't the case on my set. If you had looked
> closely you could clearly discern that the "patch" was BEHIND the LCDs and
> was not on the screen.
glass - so don't be too quick to rule out seemingly insignificant surface
damage.
Paul D Smith
Jul 2, 2013, 3:40:47 AM7/2/13
to
> +++++++++
> I can assure you that wasn't the case on my set. If you had looked
> closely you could clearly discern that the "patch" was BEHIND the LCDs and
> was not on the screen.
Some types of LCD screen have a light polarising film on front & back of the
glass - so don't be too quick to rule out seemingly insignificant surface
damage.
+++++++++++++
> I can assure you that wasn't the case on my set. If you had looked
> closely you could clearly discern that the "patch" was BEHIND the LCDs and
> was not on the screen.
Some types of LCD screen have a light polarising film on front & back of the
glass - so don't be too quick to rule out seemingly insignificant surface
damage.
For my own education, how could this cause the observed problem?
What I saw was that the LCD picture appeared to be "there" but with reduced
light coming through. If I looked at (say) 45degrees off centre, I assume I
was looking through the same LCD portion but seeing a different portion of
the backlight/screen and then the "dark" portions looked totally normal but
previously normal sections were now dark as I was looking through at the
(presumed) back parts of the screen.
At the same time there were black patches appearing on the bottom corners of
the screen, almost as it someone had failed to clean the corners of a window
properly. These also seemed to be behind the LCDs which I took to be the
backlight/screen literally coming apart and bits settling in the corners.
I've used flat screen computer monitors for years and never seen anything
like this, nor had the repair guy.
Paul DS.
Ian Field
Jul 2, 2013, 12:02:47 PM7/2/13
to
news:kqtvrn$tov$1...@dont-email.me...
alignment with polarised filters front & back, so it effectively switches
light transmission on or off.
did you think LCD technology was some kind of magic?
>> +++++++++
>> I can assure you that wasn't the case on my set. If you had looked
>> closely you could clearly discern that the "patch" was BEHIND the LCDs
>> and was not on the screen.
>
> Some types of LCD screen have a light polarising film on front & back of
> the
> glass - so don't be too quick to rule out seemingly insignificant surface
> damage.
> +++++++++++++
> For my own education, how could this cause the observed problem?
The liquid crystal twists polarised light so that its either in or out of
>> I can assure you that wasn't the case on my set. If you had looked
>> closely you could clearly discern that the "patch" was BEHIND the LCDs
>> and was not on the screen.
>
> Some types of LCD screen have a light polarising film on front & back of
> the
> glass - so don't be too quick to rule out seemingly insignificant surface
> damage.
> +++++++++++++
> For my own education, how could this cause the observed problem?
alignment with polarised filters front & back, so it effectively switches
light transmission on or off.
did you think LCD technology was some kind of magic?
Paul D Smith
Jul 3, 2013, 3:42:26 AM7/3/13
to
> Some types of LCD screen have a light polarising film on front & back of
> the
> glass - so don't be too quick to rule out seemingly insignificant surface
> damage.
> +++++++++++++
> For my own education, how could this cause the observed problem?
The liquid crystal twists polarised light so that its either in or out of
alignment with polarised filters front & back, so it effectively switches
light transmission on or off.
did you think LCD technology was some kind of magic?
+++++++++++++++
> the
> glass - so don't be too quick to rule out seemingly insignificant surface
> damage.
> +++++++++++++
> For my own education, how could this cause the observed problem?
The liquid crystal twists polarised light so that its either in or out of
alignment with polarised filters front & back, so it effectively switches
light transmission on or off.
did you think LCD technology was some kind of magic?
No, I know precisely how an LCD works and I can understand how a faulty
panel might create a dark patch, or in fact a light patch. What I didn't
see was how you believe that what I see, i.e. the patch moving as I alter my
angle to the set, could be caused by this fault.
However checking back I see that I didn't state that when I altered the
angle between myself and the dark patch on the screen, the patch "moved"
SIGNIFICANTLY, which could not occur if this were a polariser problem since
the "movement" of the patch would be dictated by the thickness of the
polariser/LCD/polariser sandwich, which is actually quite thin.
However adding in the extra "thickness" from panel to air gap to reflective
back panel would give a reasonable estimation of the observed movement based
on angle changes which is why I suspect the reflective back panel. That and
the apparent "dust" appearing within the screen.
Paul DS.
Dave W
Jul 3, 2013, 7:33:54 AM7/3/13
to
blocking the backlight. Could you take a photo of the entire screen so
we can see how big the patch is in relation? I would try dismantling
the display to investigate, knowing that the only alternative is to
buy a new TV.
--
Dave W
Richard Tobin
Jul 3, 2013, 7:45:25 AM7/3/13
to
In article <bb28t8dpcj39q0n2f...@4ax.com>,
Or pulling at it with a suction cup?
-- Richard
Dave W <dave...@yahoo.co.uk> wrote:
>It looks to me like something has fallen down behind the LCD screen,
>blocking the backlight.
Does tapping the screen near the patch cause it to move at all?
>It looks to me like something has fallen down behind the LCD screen,
>blocking the backlight.
Or pulling at it with a suction cup?
-- Richard
Tim+
Jul 3, 2013, 9:19:43 AM7/3/13
to
Tim
Norman Wells
Jul 3, 2013, 9:21:45 AM7/3/13
to
it looks to me as if the screen has just been pressed hard in the
central part, and that pressure has been transmitted along lines of
weakness to form those arms. Does he have boisterous children or a
fastidious wife?
Max Demian
Jul 3, 2013, 10:38:26 AM7/3/13
to
"Tim+" <timdow...@nospampleaseyahoo.co.uk> wrote in message
news:1357662879394550357.540154timdo...@news.eternal-september.org...
--
Max Demian
news:1357662879394550357.540154timdo...@news.eternal-september.org...
> Richard Tobin <ric...@cogsci.ed.ac.uk> wrote:
>> In article <bb28t8dpcj39q0n2f...@4ax.com>,
>> Dave W <dave...@yahoo.co.uk> wrote:
>>
>>> It looks to me like something has fallen down behind the LCD screen,
>>> blocking the backlight.
>>
>> Does tapping the screen near the patch cause it to move at all?
>> Or pulling at it with a suction cup?
>> In article <bb28t8dpcj39q0n2f...@4ax.com>,
>> Dave W <dave...@yahoo.co.uk> wrote:
>>
>>> It looks to me like something has fallen down behind the LCD screen,
>>> blocking the backlight.
>>
>> Does tapping the screen near the patch cause it to move at all?
>> Or pulling at it with a suction cup?
> Probably just wants degaussing. ;-)
'Depolarising' for LCD. ;->
--
Max Demian
Steve Thackery
Jul 3, 2013, 12:15:36 PM7/3/13
to
Norman Wells wrote:
> From the 'arms' that extend from the central portion of the dark
> areas, it looks to me as if the screen has just been pressed hard in
> the central part, and that pressure has been transmitted along lines
> of weakness to form those arms. Does he have boisterous children or
> a fastidious wife?
I agree - that looks exactly like pressure damage. At work someone
> From the 'arms' that extend from the central portion of the dark
> areas, it looks to me as if the screen has just been pressed hard in
> the central part, and that pressure has been transmitted along lines
> of weakness to form those arms. Does he have boisterous children or
> a fastidious wife?
closed their laptop with something sitting on the keyboard - a pen, I
think - and produced a fault very similar indeed to that.
Having said that, I don't actually know just which part of the screen
assembly has been damaged, but I bet it's irreparable, sadly.
--
SteveT
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