The issue may be with your remote control. Remove the batteries from your remote and turn the TV on by using the manual power button. The location of the power button will vary, check your user manual if you are unsure.
Sansui D 90 Service Manual
Some TVs have a feature called Anynet+. This is a type of HDMI called Consumer Electronic Control (CEC) and is used to connect different devices under one remote control. If you're TV is turning itself on and off it may be that Anynet+ is the cause. If you're unsure if your TV has Anynet+ check your user manual.
Please note: the following steps may look different depending on your TV model and the version of the smart menu it uses. if you're not sure of the exact steps, follow your printed user manual or download the e-manual from Samsung Support 2ff7e9595c
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