Smartmirror power supply and i2cDetect

[Chilred]

Hey,

I built my first smartmirror and have two problems that may be related.

First my setup
RASPBERRY PI 3 Model B
Raspberry Official Pi 3 Power Supply
LG-Philips LP173WF1 (TL)(B2) 17,3" LED Display Screen (non-glossy) Full HD
Hdmi Controller
Ktec Universal AC DC Power Supply 12V 3A

The Raspberry has its own power supply. It is connected to the Hdmi controller via HDMI cable. The Hdmi controller has its own power supply and is connected to the monitor.

1. Display Turns On/Off
The mirror actually works fine, but the display turns on every now and then. In the console I get the output “The Voltage is low”. However, the Raspberry Pi never restarts, only the display turns on/off.
Actually I assume that the power is sufficient. Can you give me some advice? Possibly the power supply is not enough.

2. Witty Pi Mini und i2cDetect
I bought the Witty Pi Mini and installed it according to the instructions. I would like to start the Raspberry Pi in the morning and turn it off in the evening.

I have built the controller on the Raspberry Pi. So the USB cable from the HDMI controller is connected to the PI.

I can also start the mirror via the switch. However, nothing is detected with i2cdetect - 0 or 1.

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Does anyone have any experience on these topics? I am quite a newbie and this is my first project (so don’t blame me)