Assuming a malfunction USB connector because the FP1 only reacharged holding the USB cable in a certain position I took a look inside the FP1 and in fact the USB connector was completely loose.
I’ve cleaned the 2 contacts holding the connector and soldered the connector on the board.
Whole board:
Close view of USB connector contacts:
Cleaned pin holes:
Turned board with USB connector in position…
…before soldering:
…after soldering:
Altough I didn’t break something unfotunately the FP1 is not charging more stable. Same connection interruptions as before.
Is it possible to order the complete board shown in the pictures?