Hello,
J Dot here.
Thanks for the alert
@dirkclod!
Ok, Skiddyfisk,
Depending on what seller has done, ( firmware ect? ) will let us know what is going on!
Typically the problem, is the wifi extender upgrade, that burns board #3, inside fc200 camera egg.
( can you ask the seller if he chose to UPGRADE RANGE EXTENDER THROUGH THE APP. ) if this is the case, than board 3 is done.
Now there are other possibilities!
1) bad extender?
2) bad top board ( board #1 ) you will phantom disconnected error in app.
3) wifi board ( board #4 ) bottom board, you will get " Unable to connect to phantom network "
I'd assume it is a board 3 issue, as that has been a huge issue in the past months. As stated above, the boards are not avail, through DJI, OR ANYWHERE for that matter.
Options:
1) repair shops, most just swap parts, and old stuff goes in a bin or the garbage. So I'd call all your local shops, ( looking for a CRASHED CAMERA ), as the casing will be ruined, but boards inside may have survived. I've picked them up for free, or very cheap $30 tops. The shops don't fix them, they just put a new camera on, and call t a day. ( you might get lucky? )
2) I have a buddy that has new cameras ( fc200 egg ) not sure his pricing on them? But he may sell you one, or parts one out ( I believe he has several broken units as well? ) does not hurt to ask!
Mike Holt
530-277-5366
( California time, so please be courteous, no 4am phone calls, lol

)
But honestly, I'd press seller for more info about what happened?
1) was it a extender upgrade!
2) do you get telemetry but no pic?
3) is it a completely black screen? No pic, no telemetry?
4) can he connect to phantom network?
This will help me know better of what is going on with it.
hope this helps.
J Dot