Ok guys so let's get back to repairing this camera
After little hard communication with Sony I've got the service manual
(I'm so sorry Sony I had to be a bit rude in case your official service was not able to repair this camera)
But it was not so useful as I thought, but it was enough useful to repair the camera
First of all in the service manual there is nothing mentioned about the state what I observe (when power LED and state LED is blinking together and camera don't respond on any command from IR or serial interface).
But when you have schematic, is more easier to investigate problem.
And problem was so obvious. There was missing communication between main MCU and camera video module. Yes bad connection between FCC cable and camera module connector.
After take a part cleaning and put it together all is working like a charm.
Conclusion:
It's great product and we have tens of those PTZ cameras worked years in the field, but service and support is big fail