Hello i've been using the FDN304P coupled with an ESP32 to cut 3.3v or 5V with this circuit:

Here schematic for the 5v version

and here for the 3v3:

The Problem

I’m only able to see Drain go “low” when the display connector is detached. As per the 5v version i can’t really disconnect it to test it without being attached to anything.

PCB

Here a view of the display connector mosfet. GPIO4 is the pin i’m driving high/low

Oscilloscope Tests (CH1=IO4, CH2=Drain)

Without display

Notice the time divider is much different (top 20uS, bottom 2ms)