I have just recently bought a Panasonic TX-40CX400B. I have a BT youview set top box in HDMI 1. Randomly the youview causes the TV to go into standby. I don't think it is a problem with the power for the TV, as i put it onto TV mode and left it while i went to work. When i came back the TV was still on. I then turn the youview box on and switch to HDMI, the TV will then randomly go to standby. This can happen from 5 minutes to a couple of hours. Really confused, tried a new BT box and still the same thing happens.
Solved! Go to Solution.
Got rid of TV, new samsung has no problem.
I tried a new HDMI port, lead and even a new youview box, but nothing was soloving my problem. The TV started turning itself off even when on using the xbox one, must of been a fault on the TV.