That means you may ahve problem in the power supply or the backlight inverter board. You can disconnect the cable to the inverter to see if the 24vdc comes back on, then you need to load it with 24vdc load that can draw 3~4amp to see if the power supply can handle it OK and maintain 24vdc output. Then you need to check the inverter board for shorts ot burnt out parts.
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
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