Hello, What's the model number off the back of the set?
Also, is the cable box the only thing connected?
Is the box connected using 5 color coded RCA cables?
If so, the green hue is generally caused by the red cable closest to the green being loose or pulled out completely.
Please remove the red on both ends and then plug it back in tight.
As far as the picture not being full-sized- reboot your cable box. Unplug it from power for 10 seconds then plug it back in.
Once it reboots you should be all set.
NOTE: If NOT- then reply back with the model number off the back of the Pioneer, and also the type of connections being used to the cable box and we can proceed.
If you need further assistance let me know. Please do not forget to click the 5 STAR RATING, at the top of the page for my efforts. It is my livelihood and you can follow up at any time if needed.