I have a Sanyo Flatscreen, the original remote was lost. Now when I turn on the TV the picture is to big to fit. HOW do I adjust it without the remote?

Use the menu button on the side of the tv
that brings up the screen menu
using the channel and volume buttons move around until you find aspect ratio
find the one that fits the screen and press the menu button to save and exit
it could be a pixel setting so find pixel settings while the menu is on the scree and adjust to the correct pixel setting
there are plenty of remotes for tv units on e-bay
all you have to do is select one that is for sanyo led/lcd tv's and read the details to see it it works your model tv