Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems.

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Default Dark strip on LCD...

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/

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Default Dark strip on LCD...

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%20po ssible%20
causes.pdf

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Default Dark strip on LCD...

"Sparky" wrote in message
...
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%20po ssible%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.

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Default Dark strip on LCD...

"Sparky" wrote in message
...
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%20po ssible%20
causes.pdf


Case 18 is similar, but not vertical, horizontal.

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JW JW is offline
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Default Dark strip on LCD...

On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" wrote
in Message id: :

"Sparky" wrote in message
al-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%20po ssible%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.


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Default Dark strip on LCD...

Deke wrote in message
...
"Sparky" wrote in message
...
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%20po ssible%
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.



Is the good/bad division exactly adjascent to one line or graduation over a
few lines?


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Default Dark strip on LCD...

On Sep 8, 5:45*am, JW wrote:
On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" wrote
in Message id: :





"Sparky" wrote in message
al-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%20po ssible*%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.
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Default Dark strip on LCD...

wrote:

On Sep 8, 5:45 am, JW wrote:

On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" wrote
in Message id: :






"Sparky" wrote in message
al-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%20po ssible*%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
would get this effect if one was out.

Jamie


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Default Dark strip on LCD...

On Thu, 8 Sep 2011 19:03:56 -0700 (PDT) "
wrote in Message id:
:

On Sep 8, 5:45*am, JW wrote:
On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" wrote
in Message id: :





"Sparky" wrote in message
al-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%20po ssible*%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.


Err... I'm not referring to vacuum tubes, but CCFL tubes.
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Default Dark strip on LCD...

"Deke" wrote in message
news
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.



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Default Dark strip on LCD...

"Deke" wrote in message
...
"Deke" wrote in message
news
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.


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.

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Default Dark strip on LCD...

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/


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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