@anthem212 well there are three commands to turn off the output

vcgencmd
dpms

these two turn off the HDMI port, NOT the monitor/tv

and cec-client

this turns off the monitor/tv
IF it supports the cec command(correctly)

and then you would need a people sensor,
most use use infrared, as it’s ‘easy’.

there are modules that put all this together.

search here for MMM-PIR

Now to get your speed requirements will be a little harder. I use TV’s for my two main mirror systems. 43 and 55 in.
one supports cec, the other doesn’t.
when I turn off the HDMI port on both, they put up a big NO INPUT screen , and power off after 15 minutes.
that is energy star compliant.
but you can’t turn them on via software

if it supports cec, then maybe you can turn off/on via software. mine is inconsistent. always can turn on, but not off
on is the same as pushing the button, takes 15 seconds, displays the product logo and all that.

I gave up, and just hide the mm content and leave the TV’s on. the one in the hall I call the nightlight!

I also use a webcam for motion detection, instead of pir, cause that’s what I had at the time

as yours is a 4k tv, I’m guessing it supports cec

install the cec-utils package on pi
sudo apt install cec-utils

this also only works on my pi 4. not pi3.

I’ve gotten away with 2.4A on a Raspberry Pi 3B+, but that’s riding the edge of acceptable.

@camshell said in Replace LCD control board component?:

What does the jumper block do

allow someone to change operating characteristics… no idea what THIS one does… just pins onto the circuit board…
the jumper makes some connection between the two pins. or the others etc…

no idea what it does here without a board circuit diagram…

you could have burned the circuit board connections under the jumper block… none of us will know (unless u accidentally found the people that designed and built the board.

shortest path is find another like monitor to get the board, or find another monitor