Some possible sources of a distorted picture include a problem with the TV resolution settings, an issue with the type of input being used (HDMI, component, RF, etc), or a problem with the connected device's settings.

To check if the issue is related to the TV or device, try these steps:

1. Check TV’s resolution settings: If the picture is unexpectedly blurry and stretched, it is likely due to a mis-match between the TV’s native resolution and the resolution setting of the device it is connected to.
2. Check the type of input used: Check the type of input cable being used to connect the TV to the device (HDMI, component, RF, etc). It is important to use the right device for your TV in order to get a better image.
3. Check device settings: Make sure the device's display settings are appropriate for the TV's native resolution.
4. Restart both TV and device: Try restarting the TV and device to clear any stored settings and re-establish the connection.