I’m working on a custom laptop, using an old LCD screen. I’m having trouble identifying a pin on the board. There is an 5x2 section of header pins that connect the LCD controller to the inverter/power supply, 2 are +12v, 2 are +5v, 5 are GND, and one says N/F GND. I’m not sure what it is, I’ve been doing a lot of testing with my multimeter, but it doesn’t seem to be connected to anything on the controller side board. I searched Google for a while, but “N/F” doesn’t seem to be search engine friendly (I get a bunch of strange search results). Any ideas of what it could be?
Here’s the pinout:
(12v) (GND) (5v) (BL GND) (N/F GND)
(12v) (GND) (5v) (BL GND) (GND)
The BL GND and GND pins are connected together (continuity test).
On a side note, which would be easiest:
:% Connecting an ATX motherboard to the power supply above (I’d need add a 3.3v regulator somewhere, and figure out what what to do with the Power Good, 3.3v Sense, and 5v Standby ATX pins).
:% Connect the LCD controller board to an ATX PC power supply (I’d have to figure out what the N/F GND pin does and create a DC-AC inverter for the backlight (at least I think so, the power coming from the inverter to the backlight is AC…so that seems logical to me).
ATX Power Pinout: