Read and try what's written at https://www.reddit.com/r/hometheater/comments/3ftlgy/55_sanyo_picture_quality_is_terrible/ then consider using a calibration DVD like Disney WOW.
I picked up this budget set for my elderly mom. Picture is not very bright but just tweaking the settings didn't seem to improve the overall.
Can anyone help with some settings or even general advice in setting up a Sanyo? Thanks!