[jytug]

Are you measuring this with a multimeter, or an oscilloscope? This pin is driven via PWM, so it's possible that a multimeter reading could be giving you an average voltage.

I would be most suspicious of the J4 pins (give the LED_ENABLE pin a poke with a needle to see if it's budging; possibly it's a dry joint?), or perhaps the LED_ENABLE pin on the ESP needing a reflow. You may also want to inspect the corresponding pins on the display panel where it's soldered to the faceplace.

Thanks a lot Jacqueline. The noob I am I was measuring with a meter, and with a scope I see that pin 8 is indeed PWMing, but the test point before the MOSFET is not, so it's a shoddy joint on one of the connectors (or maybe the cable itself). I'll update when I get a chance to fix that!