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What is the source please for the HDMI signal as sometimes you need to set this output type in the settings for the source equipment so that the digital signal is sent from the HDMI output connectors to TV's HDMI input connector.
Is the source plugged directly into the TV or routed through other equipment?
Do you have another HDMI source to verify that the problem is not with the source's HDMI output connector please?
Thankyou for the reply and sorry for the delay in getting back to you
If you select the input manually by following this pg from your manual can you get the signal to show that way?
On pg43 of the manual please use the Inputs Menu to make sure that all HDMI ports are active so that the "Auto Input Sensing" feature can detect sources .