Apple introduced a feature in MacOS Big Sur v11.4 and has carried it through to the current version 12.4 of Monterey. The OS checks the LCD part/serial number(not sure what Kernel extension does this) against those hashed in the AppleBacklight.kext and AppleBacklightExpert.kext if they do not match then certain features of the display will be disabled (and no these kernel extensions can NOT be modified as Apple locked down the System/Library/Extensions folder. you can read them but can not change/delete them). I have replaced the Screen on a 13" 2017 MBP with Touchbar, with an OEM (plastic aftermarket shell and nameplate) and the Brightness controls do not work at all and are missing from the Display Prefs Pane under Big Sur (v11.4+) and Monterey. However they are present and everything works fine in Mojave and Catalina. So if you have swapped over your display and find some features like Brightness controls are missing Try loading MacOS Catalina or Mojave, that may solve the issue.

Silly tutorial..

Why do these chips have heat sinks??? To remove heat to prolong chip life.

And you want to apply heat from a hot air gun heating chips past their rated thermal limit to the point where solder re-flows (approx. 400 degrees C) Most chips have an upward thermal limit of around 120 degrees C.

Take it to a professional do not do this yourself. Remember that the chips have internal solder connections as well so whilst your heating up the chips to reflow the solder you also run the risk of detaching the internal connections thus forever ruining the chip.