Dark strip on LCD...
Deke
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/
Sparky
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>
Deke
news:0001HW.CA8D2912...@news.eternal-september.org...
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.
Deke
JW
in Message id: <6a6dnSLMff1LRvrT...@giganews.com>:
Likely one of the tubes has failed, or possibly the inverter driving the
tube.
N_Cook
news:6a6dnSLMff1LRvrT...@giganews.com...
few lines?
hrho...@att.net
> On Wed, 7 Sep 2011 16:02:35 -0500 "Deke" <notgonnahap...@today.com> wrote
> in Message id: <6a6dnSLMff1LRvrTnZ2dnUVZ_gudn...@giganews.com>:
>
> >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
>
> - 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.
Jamie
>>>>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
would get this effect if one was out.
Jamie
JW
<hrho...@att.net> wrote in Message id:
<9921a505-21d9-4176...@a31g2000vbt.googlegroups.com>:
Deke
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
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.
Jerry G.
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.