Polaroid Tv No Signal From Hdmi Connecting A HD Ready TV, A Freeview Set Top Box And A VCR.?

Connecting a HD ready TV, a Freeview set top box and a VCR.? - polaroid tv no signal from hdmi

Hello, I bought a Polaroid LCD TV.It 'a Scart and HDMI connection.The antenna is connected to the decoder with a SCART socket of the decoder to the recorder.
The film has two scart connections, a decoder, a TV, an air-loop also operates the VCR to the TV.
The television offers six input options, the videos
Scart, if selected, but saving seems impossible.
The Video menu appears on the TV screen, which can be made for projected images will be displayed
Fertility in a message "No Signal" or "Pandora's Box", as if something "adapted?
All useful suggestion, please?
Thank you.