Hi, I was thinking to remove the voltage regulator (662k, have circle around it in the PCB image) from the circuit so I can control the switch on/off with my esp32.
I removed it but the switch is working fine without it and the IC (IC9642) gets 3v, I do not understand where the 3v comes from and how the switch is working without the voltage regulator.

 

I see another connector that might be USBC3, and that may have power included. I do not recall there being a power conductor in the HDMI specification, but there might be.

 

I see another connector that might be USBC3, and that may have power included. I do not recall there being a power conductor in the HDMI specification, but there might be.

The USB is not connected. The HDMI 5v goes to the voltage regulator VIN. Do you have any suggestion how I can achieve the goal to turn it on/off? I tried removing the resistor between VCC and EN but no affect.

 

Probably the supply for the IC is coming from the protective diodes on the inputs providing the power to operate.
WHY do you want to switch off the power by means of the esp32???? Is there a problem with the HDMI signal being present??? Or is the intention to blank a screen some times??? Are you using all four inputs on that switcher??

If switching off the outputs is the requirement, the spec sheet lists pin two as an output enable/disable control. THAT is the way to do it. Bt removing the voltage regulator you have removed the protection against accidental destruction of the IC by an over voltage transient. That does not seem like a good choice.

 

Probably the supply for the IC is coming from the protective diodes on the inputs providing the power to operate.
WHY do you want to switch off the power by means of the esp32???? Is there a problem with the HDMI signal being present??? Or is the intention to blank a screen some times??? Are you using all four inputs on that switcher??

If switching off the outputs is the requirement, the spec sheet lists pin two as an output enable/disable control. THAT is the way to do it. Bt removing the voltage regulator you have removed the protection against accidental destruction of the IC by an over voltage transient. That does not seem like a good choice.

I need to switch on/off (blank screen) the signal from a PC to a monitor with the existing project on my esp32. The PC will be connected to one of the switchable HDMI (doesn't matter which one), The monitor will be connected to the non switchable HDMI port, The USB-C is not used. Controlling the switch button is not good for my project. Basically, I don't use the switch to actually switch between signals, I want to use it to turn on/off the monitor with my esp32.

How can I control pin 2? I removed the resistor from pin 1 to pin 2 but I didn't see any difference.
My knowledge in electronics is very basic and I thought if I remove the voltage regulator the IC get no power and then I can power it with the esp32. I used the switcher without the voltage regulator only for a few seconds and returned the voltage regulator back.

 

I need to switch on/off (blank screen) the signal from a PC to a monitor with the existing project on my esp32. The PC will be connected to one of the switchable HDMI (doesn't matter which one), The monitor will be connected to the non switchable HDMI port, The USB-C is not used. Controlling the switch button is not good for my project. Basically, I don't use the switch to actually switch between signals, I want to use it to turn on/off the monitor with my esp32.

How can I control pin 2? I removed the resistor from pin 1 to pin 2 but I didn't see any difference.
My knowledge in electronics is very basic and I thought if I remove the voltage regulator the IC get no power and then I can power it with the esp32. I used the switcher without the voltage regulator only for a few seconds and returned the voltage regulator back.

OK, according to the data sheet provided, an active LOW on pin #2 will disable the outputs regardless of what the selection inputs are. OF COURSE, you will also need to bring a common from the esp32 output to the digital common of the IC. For that you will need to understand both the connections to it AND the connections to the processor board.

 

OK, according to the data sheet provided, an active LOW on pin #2 will disable the outputs regardless of what the selection inputs are. OF COURSE, you will also need to bring a common from the esp32 output to the digital common of the IC. For that you will need to understand both the connections to it AND the connections to the processor board.

I would use an optoisolator and the switches 5V rail.

 

This is an HDMI pinout shows pin#18. is 5V and pin#17. is Ground, #19 hot plug detect. but always check.
The 4K HD video switch will automatically find which input is turned on and use it as source such as
A PS3, XBox 360, HDVD. HDV, Microscope, laptop A, Laptop B USB L-Z

 

I would use an optoisolator and the switches 5V rail.

I know the 5v rail goes to the voltage regulator VIN but I'm not sure how to control it. Do I need to disconnect the path?

This is an HDMI pinout shows pin#18. is 5V and pin#17. is Ground, #19 hot plug detect. but always check.
The 4K HD video switch will automatically find which input is turned on and use it as source such as
A PS3, XBox 360, HDVD. HDV, Microscope, laptop A, Laptop B USB L-Z

I'm sorry but I do not understand what you suggest.