No picture but sound. When turning the tv on the

Where did you get your used boards from Jerrard?

its shot

Check the power supply module for bad DC filter caps first, then check the backlight inverter board for shorts.
If you are going to DIY and have proper tools, electronics knowledge, 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
Capacitors kit: http://lcdalternatives.auctivacommerce.com/

Please post back what you find.

The poroblem can either be the 12~18vdc power supply section is not supplying the power to the backlight inverter board or the inverter board went out, you need to check voltage on the power supply, also look to see if you see any caps with leaking/bulging top.
See example of failed TV and monitors here:
http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.badcaps.net

Sound like an inverter board problem, call around see if can get a shop that can get it for you last I checked they where no longer available. Julio - Millenium TV in Las Vegas

I am going to assume that you have not already found the answer to this problem. It is actually pretty common for flat panel televisions in the winter to be too cold to turn on. What I did when faced with this problem on my 32 inch memorex was turn it on for 30 minutes while covered with a fleece blanket, than turn it off. When you turn it back on it should work...did for me!

I have one of these in my shop with same problem. Unit has sound but no backlights due to the powersupply/inverter board ( top board in metal box. The lights come on for a second and go out. Problem was originally intermittent. You can order this board from Fox Intl Part but will take a minimum of 12 weeks. Look at the lower right corner of this board and locate the dip switch of 4 positions. the bottom one is labeled " normal & burn " Try moving it to "burn" My set is in the burn position and has been running for 2 days now OK

www.cfusion.com has the spare parts for that tv. it sounds like it is the mainboard. shouldn't be more than 150-200 to replace.

Try to use dvd player to play video to determine where the problems goes wrong either from the video signal of the cable provider or from the TV itself.

Please let me know any update.