Fly sky fs-rx2A connecting to FC issues.

[Bruce108]

I am building a babytooth with fpv cycle AIO FC. I have my RX (FS-rx2A v1) bound to my (Flysky FS-i6X) transmitter but not getting any signal to the quad.
FC has Sbus, T1, R1.
the RX has yellow PPM wire and brown Ibus wire.
I have tried both PPM and Ibus wire from RX to FC SBUS tab. but still not connecting to quad. also tried changing the output on the transmitter to ibus and sbus. Using betaflight and RX not showing up. Any help would be greatly appreciated.

 

[Dugdog47]

Be sure to solder your 5v jumper and try hooking ibus up to R2, sbus pad won't work for that receiver.

 

[Bruce108]

Well I got my quad flying for a bit after changing connection from rx. My camera was intermitent so I tracked a loose wire and re soldered a few connections. Also couldn't connect the vdx in betaflight so wired to t1 and now to r1.
Now, camera is back on but I can't connect the fc to computer, betaflight or bheli and the quad wont arm. I looked around for a blob of errant solder or bad connections. it's so tiny.. but looks ok. Any thoughts.
Thanks
B

 

[Dugdog47]

Usually if you can't connect your fc means you need to put your board on bootloader mode and flash the firmware.

 

[Bruce108]

I think it is a loose connector. it showed up Betaflight for a few seconds, got all excited then disappeared again. I did such a franken solder job due to may shitty iron replacement and moving wires around. ordered a new iron.... was afraid of a short. but now thinking that usb connector may be loose. I hope not after watching the work around videos.
Thinking about starting from scratch after I clean off the board then connect to Betaflight.

 

[wafflejock]

Yah clean off and disconnect from everything else then just connect the FC is your best bet really can do some continuity checking or check input voltage and output voltage on regulators but not much more you can easily test really. There are connections from the usb port to the stm32 chip but the pitch on those is super tiny so would need some tools or extremely steady hands to check that out of do any sort of repair (also just not worth the time since cost of FC is like $40 typically)

 

[wafflejock]

If it is just usb port that got lifted slightly you could reflow that section of the board with a hot air reflow station but again matter of cost of equipment and effort to fix vs replacement cost. Might also get away with throwing it in a toaster oven for poor man's reflow but would want to air that out and probably do it with good ventilation if planning to try (has been known to work for motherboards or graphics cards where reflowing the solder reestablished connections that broke from thermal flexing or otherwise, usually a temporary fix if anything since likely the component still has the thermal issues that caused it to flex/break in the first place). Also bare minimum can get the FC out of there and try to squeeze the port down onto the board while connecting.