the turbo display is configured manually with the pins.
U set a display for button pressed and depressed.
there is 3 pins on the back of the led display. middle is most likely ground so when the switch is on pin1 + ground is turned on
when the switch is off pin 3 and ground is on
this switches between the 2 states.
The switch for the turbo led display is most likely direct to the physical button on the case.
those turbo buttons have 2 arrays of 3 pins
1 set of pins goes to the led display
the other set goes to the motherboard to switch turbo on/off
so when you press the button 2 independent signals change
1. motherboard on/off
2. led display on/off
There is no reading of mhz being read from the motherboard
it looks like those 3 pins and your tl th, turbo low turbo high perhaps?
but it looks like your 5v and ground is not connected, that is where the power to led comes from. Dont connect the switch to the 5v or you will melt the mechanism inside the physical switch