Soldering mistake, metal layer lifted off from the board

[Taner]

Hello,

I was trying to solder xm+ receiver to my mobula 7 v2 (Onboard frsky receiver seems to be dead). 
I did the soldering and I wanted to check if it was OK and drag the soldered wire... AND UPPPPSSSS soldered wire lifted the metal layer of the board and there is no way to solder there right now. Is it possible some kind of fix to this brutal mistake?

I try to find wiring diagram for crazybee f3 pro but all I find is the same diagrams. There are some more wiring points possible on the board but diagrams does not explain what are they used for. Just wondering if I can find another Rx point to solder on the other side of the board or if I can fix this problem somehow?

[voodoo614]

Not an easy fix. You can try to look for the trace and scratch enough to solder. Otherwise, you can locate the pin off the MCU, but that is brutally difficult to solder.

[voodoo614]

I can help you with locating the pin if you are interested.

[Taner]

It would be really interesting to do that and i will really appreciate it if you can guide me.
Thank you.

[voodoo614]

3rd pin from the right. Make sure you orientation the dot on the IC correctly to my photo. FYI, this the the 22 pin or PB11 pin. It should be next to the pads. Good luck with the solder. You can actually see the outline of the trace in the photo I posted.

[Taner]

3rd pin from the right. Make sure you orientation the dot on the IC correctly to my photo. FYI, this the the 22 pin or PB11 pin. It should be next to the pads. Good luck with the solder. You can actually see the outline of the trace in the photo I posted.

Thank you very much for the detailed information! Now I see what you mean with brutally difficult soldering
I could locate the 22 pin after the dot on IC as you show on the picture. ( I could not understand PB11 pin but it means the same pin, just starting counting the pins from another point?).

On the other side of the FC there are many wiring options which I could not find explanation for them. If I find any shortcuts from pin 22 to this empty soldering points, do you think it could also work? (I will buy a multimeter ASAP to check it).

[Taner]

I just find a video with bad resolution but it is good to see how to solder on a IC pin.

[voodoo614]

Pin 22 is PB11. So same thing. 



Yes, you can look for continuity with a pad on the backside, but I am pretty sure none of those will have continuity. So don't waste your time. I would try to scratch the trace an solder to that.

[voodoo614]

I just find a video with bad resolution but it is good to see how to solder on a IC pin.

This is where a DMM is helpful to make sure you don't bridge to the adjacent pins.