I had my FS-i6X open earlier today and I noticed there was a connector marked "P10" which had nothing connected to it. In the image below, it's in the bottom right. Does anyone happen to know what it's for?

While the pins themselves aren't labelled, that P10 connector on the Flysky FS-i6X is very likely a MCU debug connector that can be used by the factory or a repair shop to diagnose issues with the MCU. On the left is the black 5-pin MCU debug connector that is present on the older FS-i6 in a similar location on the mainboard. That connector is missing on the mainboard of the FS-i6X on the right, but the white 5-pin connector is present instead. So that is almost certainly what it's for.

(12-Aug-2020, 11:33 PM)SnowLeopardFPV Wrote: While the pins themselves aren't labelled, that P10 connector on the Flysky FS-i6X is very likely a MCU debug connector that can be used by the factory or a repair shop to diagnose issues with the MCU.

Thanks, makes sense. Although I see some bare contact points for pogo pins, which is a more common way to debug board issues.

There are other connections that aren't even fitted with a connector, like that 10-pin P7 connector footprint on the top, and 6-pin P8 on the left. I know it's pretty standard to design one mainboard, and then populate it according to which precise model the board goes in. Was just wondering if anyone has done some research into these unpopulated connectors on these radios.

Not too many people on here use the Flysky transmitters so I'm not sure you will get any definitive answers. Someone on RC Groups might know, but it would probably be worth getting your multimeter out and see if any pins on that connector trace back to any of the legs on the MCU. And if they do, check the MCU datasheet to see what those legs correspond to. At least that will let you either rule out or confirm if the P10 connector is an MCU debug port.

hi friends ,

do you have the circuit diagram of the skyfly fs-i6x transmitter

thank you

(09-Sep-2021, 03:50 AM)ravindu_buwaneka Wrote: do you have the circuit diagram of the skyfly  fs-i6x transmitter

There are no published circuit schemic diagrams for any of the electronics we use in this hobby unfortunately. You will just have to figure out where any connections go to on a circuit board by tracing their route using a multimeter.