Why is there no picture on AV1/AV2 input?
A. When there is no signal, make sure that the screen is blue or says "No Signal". Confirm that the AV device is correctly outputting video.
B. Make sure that the AV wire is connected correctly, and try using a different AV wire.
C. Switch between AV1 and AV2 modes and see if the unit will display a picture in both/either mode.