I lost my Sanyo TV remote and cannot change the "PIX SHAPE". Help!?

Hello, I have a Sanyo 50" HDTV Model #: DP50749 , and I have lost the remote control for about 1 and half years. I recently set up some devices with an HD-MI cable to my TV, and the screen enlarged when I switched to the HD-MI channels. I tried almost everything on my devices to switch my tv screen to normal, I tried replacing the HD-MI cables three times(even with a 30$ HD-MI cable), I tried resetting my devices, and there is also no "PIX SHAPE" button on the side of my TV other than VOLUME, CHANNEL, and POWER. I am a student and do not have interest in buying another Sanyo remote for $20+, I also researched that universal remotes do not have a "PIX SHAPE" button to connect with a SANYO tv. Please help me change the PIX SHAPE ( TV picture size ), please HELP!!!
THERE ARE NO BUTTONS ON THE SIDE OF TV OTHER THAN VOLUME AND CHANNEL!!!!!!!!!!!!!!!!!!