TV went black, just sound!

Have Sanyo model DP19648. Screen is black, sound works. Powers on and off, green(power)light works with tv power button on set and both remotes. Set stays on with sound until powered off. Did the flash light test nothing visible. Channels change on Fios box and audio changes according to the station selected. No functions appear on the set when adjusting volume or changing channels. Removed power board to see if anything was noticeable, no burn/flash marks that I can see. Is there a specific location on the board that I should look into? Is this a common problem? Can a tech/repairman test this board outside of the unit? Is it worth repairing? Can it be done inexpensively or is a refurbished replacement available that wouldn't cost more than a new set?

Submitted pictures, named files just to separate in my computers folder not for any relevance of part numbers etc.