Dark strip on LCD...

D

Deke

Guest
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4 of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!



Picture of the Day http://apod.nasa.gov/apod/
 
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4 of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!
Click to expand...
*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark band.
If not...

Your LCD display is probably bad. The display is made up of wide bands (about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

<http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible%20
causes.pdf>
 
"Sparky" <see@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible%20
causes.pdf
Click to expand...
Yes, video is visible in the dark area, its only about half as bright as the
rest
of the screen. In dark scenes its not noticeable, but on light screens its
easy to see it.
 
"Sparky" <see@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible%20
causes.pdf
Click to expand...
Case 18 is similar, but not vertical, horizontal.
 
On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" <notgonnahappen@today.com> wrote
in Message id: <6a6dnSLMff1LRvrTnZ2dnUVZ_gudnZ2d@giganews.com>:

"Sparky" <see@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible%20
causes.pdf


Yes, video is visible in the dark area, its only about half as bright as the
rest
of the screen. In dark scenes its not noticeable, but on light screens its
easy to see it.
Click to expand...
Likely one of the tubes has failed, or possibly the inverter driving the
tube.
 
Deke <notgonnahappen@today.com> wrote in message
news:6a6dnSLMff1LRvrTnZ2dnUVZ_gudnZ2d@giganews.com...
"Sparky" <see@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about
1/4
of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it
out
on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your
insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If
the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-

tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible%
Click to expand...
20
causes.pdf


Yes, video is visible in the dark area, its only about half as bright as
the
rest
of the screen. In dark scenes its not noticeable, but on light screens
its
easy to see it.
Click to expand...

Is the good/bad division exactly adjascent to one line or graduation over a
few lines?
 
hrhofmann@att.net wrote:

On Sep 8, 5:45 am, JW <n...@dev.null> wrote:

On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" <notgonnahap...@today.com> wrote
in Message id: <6a6dnSLMff1LRvrTnZ2dnUVZ_gudn...@giganews.com>:






"Sparky" <s...@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...

TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible­%20
causes.pdf

Yes, video is visible in the dark area, its only about half as bright as the
rest
of the screen. In dark scenes its not noticeable, but on light screens its
easy to see it.

Likely one of the tubes has failed, or possibly the inverter driving the
tube.- Hide quoted text -

- Show quoted text -


What tubes - They stopped using vacuum tubes years ago, the last one
was the CRT itself, and that would not fit the description of an LCD
tv.
Why not? LCD TVs normally have multiples of CCLamps in them and yes, You
Click to expand...
would get this effect if one was out.

Jamie
 
On Sep 8, 5:45 am, JW <n...@dev.null> wrote:
On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" <notgonnahap...@today.com> wrote
in Message id: <6a6dnSLMff1LRvrTnZ2dnUVZ_gudn...@giganews.com>:





"Sparky" <s...@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other.  A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed.  Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible­%20
causes.pdf

Yes, video is visible in the dark area, its only about half as bright as the
rest
of the screen.  In dark scenes its not noticeable, but on light screens its
easy to see it.

Likely one of the tubes has failed, or possibly the inverter driving the
tube.- Hide quoted text -

- Show quoted text -
Click to expand...
What tubes - They stopped using vacuum tubes years ago, the last one
was the CRT itself, and that would not fit the description of an LCD
tv.
 
On Thu, 8 Sep 2011 19:03:56 -0700 (PDT) "hrhofmann@att.net"
<hrhofmann@att.net> wrote in Message id:
<9921a505-21d9-4176-93bf-061f2813c7a4@a31g2000vbt.googlegroups.com>:

On Sep 8, 5:45 am, JW <n...@dev.null> wrote:
On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" <notgonnahap...@today.com> wrote
in Message id: <6a6dnSLMff1LRvrTnZ2dnUVZ_gudn...@giganews.com>:





"Sparky" <s...@thesig.net> wrote in message
news:0001HW.CA8D291200228F8EB01029BF@news.eternal-september.org...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of
the way down on the screen, running from one side of the screen to the
other.  A technician from the insurance company is coming to check it out
on
the 13th of this month.
I think one of the backlights has failed.  Is it repairable?

TIA!

*Anything* is repairable. Is it economically worth it? Only your insurance
company can tell you. ;-)

It's probably not a backlight. Can you see video in the dark band (look
very
closely -- shine a bright flashlight at the area to help you see)? If the
backlight has failed you should still be able to see video in that dark
band.
If not...

Your LCD display is probably bad. The display is made up of wide bands
(about
3" -- depends on the model) running horizontally and vertically. Each of
those areas is controlled by a driver IC. If one of the driver ICs fail
you
get a dark or light band (horizontal or vertical).

This PDF has some symptoms, causes, and fixes:

http://preher-
tech.com/Documents/LCD%20TV%20Display%20failure%20symptoms%20and%20possible­%20
causes.pdf

Yes, video is visible in the dark area, its only about half as bright as the
rest
of the screen.  In dark scenes its not noticeable, but on light screens its
easy to see it.

Likely one of the tubes has failed, or possibly the inverter driving the
tube.- Hide quoted text -

- Show quoted text -

What tubes - They stopped using vacuum tubes years ago, the last one
was the CRT itself, and that would not fit the description of an LCD
tv.
Click to expand...
Err... I'm not referring to vacuum tubes, but CCFL tubes.
 
"Deke" <notgonnahappen@today.com> wrote in message
news:DKudnXrJK4zXSPrTnZ2dnUVZ_gGdnZ2d@giganews.com...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!



Picture of the Day http://apod.nasa.gov/apod/
Click to expand...
Insurance tech came today, and as I suspected, it has a back light that has
failed.
Now its a waiting game to see what they will do.
Thanks to all who replied.
 
"Deke" <notgonnahappen@today.com> wrote in message
news:rKydnW7i4OVQoO3TnZ2dnUVZ_uednZ2d@giganews.com...
"Deke" <notgonnahappen@today.com> wrote in message
news:DKudnXrJK4zXSPrTnZ2dnUVZ_gGdnZ2d@giganews.com...
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4
of the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out
on the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!



Picture of the Day http://apod.nasa.gov/apod/


Insurance tech came today, and as I suspected, it has a back light that
has failed.
Now its a waiting game to see what they will do.
Thanks to all who replied.
Click to expand...
And a call from the insurance agency came Friday, they are replacing the TV
with a newer model Vizio, remanufactured, with better specs. They are also
paying for UPS to deliver it to my house. I'm happy.
 
On Wednesday, September 7, 2011 4:34:38 PM UTC-4, Deke wrote:
TV is a Polaroid 42" 1080p LCD, model TLX-04244B.
It was purchased on 11/28/08, at Wal-Mart, with an extended warranty.
It has developed a horizontal dark strip, about 3 inches wide, about 1/4 of
the way down on the screen, running from one side of the screen to the
other. A technician from the insurance company is coming to check it out on
the 13th of this month.
I think one of the backlights has failed. Is it repairable?

TIA!



Picture of the Day http://apod.nasa.gov/apod/
Click to expand...
I don't know the arrangement of the back plane CFL lamps, but it is possible one of the lamps or its supply or both have failed for one area of the screen. This is what your description sounds like.

It is also possible to have a defective panel or drive module, but from the way you describe the fault, it may not be.

With some LCD panels it is possible to to change the back plane lamps and power supply. All the lamps and the complete power supply assembly would have to be replaced. Replacing only one defective lamp would result in uneven illumination due to the age difference of the lamps.

I would seriously want to replace the set. The newer sets are far improved!

Jerry G.
 
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