I have a rca l32hd32d tv/dvd combo replaced the dvd player and now i have sound but no picture.

Try vith headphones or audio out on the scart .
Try with audio standard in menu options.
try with signal on scart or hdmi input with other source of signal like dvd or cabel recivers.
If there are no sound after this you have to check-replace the audio section in your tv.

Most likely you have a bad back lamp. Most times when this occurs, the screen will come on for a second or two then go off. Replacing a back lamp isn't a job for do it your selfers. It will involve completely disassembly of the LCD panel.

I need a better description of the problem--does it happen on the TV or DVD or what?

After the screen goes black, do you still have sound or you have none but a blank screen? If you have no picture and sound does the power LED in front of the tv indicate that the set is on, or does it go into standby? Please provide this info so that I can help you with your problem.

Sai.

Now u put in a DVD movie disc into the DVD player slot.The DVD disc still register on the tv LCD screen,but just don't read the DVD disc?Yes.Tries websites like Amazon.com,Ebay.com to buy a DVD cleaning disc kit to used to clean the DVD laser eye of the DVD player slot,after this it should work.If tv still have the same result,than this tv problems DVD player slot can't be fix or worth fixing because the DVD player slot laser eye is bad or dead alredy.

Hi, my name is John. Welcome to FixYa. Put the TV on channel three or channel four. Thanks for choosing FixYa....John

I may have lost the 24vdc power supply or the backlight inverter board shorted out or not getting the ON command to the inverter, please read my guide to understand how LCD TV works.
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/Default.aspx

I unplugged the tv and the cable box and pulled out the battery of controls for 12 hours. When I turn on again, the tv and cable box back to normal.

i need my tv with a picture soon so i can watch my tv please