after some testing i was able to get the camera out of the error. it turned out that it passes the test if you turn on the camera upside down. but during the inspection i found out that the diaphragm works at all values ​​except fully open. this indicated a connection with the infrared hall sensor in the diaphragm.

post about this repair you can read on my lj page:
https://awayrepairs.livejournal.com/2...
my instagram for repairs @awayrepairs