Westinghouse 32 lcd tv - no picture no sound - set comes on power light stays on logo comes up but then screen goes black and no sound either - would this be a bad power or bad main board?

Replace the TV and waste no more time guessing on this.

The TV is not receiving a video signal. It is probably the cable you are connecting the tv to the source. If you are using an adapter, don't. Buy a proper cable.

the transformer for the backlight is usually what fails on the elements especially if the logo comes up briefly then the screen goes out. I would check the transformers.

HI:
Seems have no Y-Drive, Check and or replace the Main Y-sustain board.

This problems are the tv 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards provide the tv LCD screen pannel a backlight to produce a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes 1 or 2 long LCD inverter boards for the replacement.

Check the solder joints in the 24vdc power supply section around C310.
http://s807.photobucket.com/albums/yy352/budm/Westinghouse%20LTV-32W1/

If you are going to DIY and have proper tools and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com

Ur tv the LCD inverter board it dead.The LCD inverter is the board that help the LCD screen panel to get a backlight to produce a picture,the LCD inverter board is dead and it not working anymore that why u only get 8 sec.of the picture.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish LCD inverter board for the replacement.It a long board in shape.

Mainboard damaged.

will not turn off power with out unplugin it