Sony Cyber-Shot DSC-T3 Digital Camera "timout" Questions

...worked (except for a real repair) is to set the display light timeout for 5 seconds, The standby timout for 1 minute, Turn the camera off, and on again, Wait for 5 sec then the display goes blank, ...

...fully charged, the doors are closed...I'm puzzled. its worth looking to see if you have a stand by timout set up on the camera, somethimes this affect how long the camer will stay on for also you ...