You read my mind that's exactly what I did last night but unfortunately none of the pending outputs on the controller seem to react to the lights on the lcd.
Here is what I found, with or without turning on the light:
N=38v
G=0v
S=0v
H=4,5v
X4=5v
X5=5v
X6-P2=5v
X7-P3=5v
X8=5v
g=0v
hv=0v
sk=38v...