This sounds like the TV has a good backlight but no video signal to the LCD. Additional diagnostics are needed to determine where the fault actually is. Most likely its the board but it could be the panel itself. You will need to track resistance between the parts and possibly the current as well to find the exact fault.
Some parts for the TV are available here: http://www.partstore.com/Model/Best+Buy+Company+Incorporated/Dynex/DXLCD3209.aspx . ShopJimmy.com may have parts from slightly used TVs of this model (QC and then damaged in shipping).
Answers & Comments
This sounds like the TV has a good backlight but no video signal to the LCD. Additional diagnostics are needed to determine where the fault actually is. Most likely its the board but it could be the panel itself. You will need to track resistance between the parts and possibly the current as well to find the exact fault.
Some parts for the TV are available here: http://www.partstore.com/Model/Best+Buy+Company+Incorporated/Dynex/DXLCD3209.aspx . ShopJimmy.com may have parts from slightly used TVs of this model (QC and then damaged in shipping).
I hope this helps.
Cindy Wells