Video goes off after being on for a second after pwoering up....Audio OK.

Here is a direct link to your Online User Manual in case you don't have one:
http://www.fixya.com/support/p509119-westinghouse_sk_32h240s_television/manual-34756 To view the Owner's Manual / Operating Instructions just use your mouse to click on the link which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the contents of the operating manual.

You can download ADOBE READER free from WWW.ADOBE.COM to view it if necessary.

Often a dark screen is an indication of a problem with the BACKLIGHT or the INVERTER CIRCUIT.

After it flickers briefly at the start, is the screen still illuminated but without a video signal or is the screen completely dark?

Does the TV screen glow at all when it is on, or is it completely black even when viewed in a darkened room?
LCD TV's especially this model are succeptible to premature failure of the power supply and inverter circuit boards which power the backlights.
If the problem is just the power supply or inverter circuit, there is a chance that it is a relatively easy fix for someone who is handy with a screwdriverr and a soldering iron.
However If you are not a fix it yourself kind of person for this type of product then you might be looking at an fairly expensive repair bill for parts and labour (at least $100). Outright replacement with a brand new set that comes with a warranty may be a more economically sensible alternative.

Here is a link to another expert's excellent LCD TV Troubleshooting Guide which gives you an idea of the kind of work necessary to diagnose and repair these tvs: http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

Please comment back on this page with the above information and I will be able to assist you further, and don't forget to also click on the 4 Thumbs Up rating icon for anyone else's advice you find at all helpful.

Thank you.

Joe.