Have a model LN 32B640R3FXZA. We have been getting a dark 1/2 screen that clears for awhile if you touch/move the screen . It seems to clear and stay fine after an hour or so but is constant with each time the TV is turned on

That can be bad connections on the ribbon cables between the LCD panel and the T-CON board.
Please download and read about T-CON/LCD panel symptom and troubleshooting here:

SONY T-CON: E40951307-TCON Troubleshooting 10-22-09_OPT

http://www.scribd.com/doc/25276757/E40951307-TCON-Troubleshooting-10-22-09-OPT

PDF download: http://www.mediafire.com/?zzjygannjty

LCD panel: http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/

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

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.