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.