I have sound but no picture

Always unplug the TV before you start....:)
On the Sanyo DP19648 has sound and NO picture.Take the TV apart locate the power supply board on left.Remove the plugs for the lights etc.take out the screws carefully unclip the power supply.Turn it over find the F1 tiny chip fuse locaed off center to the left with metal sheild away from you.I used a 2 amp (bc fuse unknown)I broke an agc style standard fuse and used the wire that was inside the fuse and also replaced the slightly bulged 220uf at 25volt cap which is located top side not far from burnt fuse.I suspect the fuse blew bc of the small orange bulged cap.
From Ed the tech....good luck

Yes, check the power supply if it has 12vdc, if it does, then check the inverter circuits for blown fuse, bad solder joints, etc..
Also look to see if there are any bad caps with leaking/bulging tops.

http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide