Phantom 4 - no telemetry, no picture

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Hi, have anyone experience with following problem, please ?

Phantom 4 with sign of liquid damage in camera area (sd card slot, oxidization on heatsinks).
Look like something was spilled inside, very little, it didnt fall in lake or river.
From outside, no visible liquid damage anywhere.

Replaced whole camera assembly, but no change.
Drone starts without visible error in DJI Go.
Can start engines.
No battery voltage shown.
IMU dont show gyroscope and accelerometer data in DJI Go, IMU can be calibrated.
Compass works - react to drone orientation.
3.3V measured on IMU board test point..
No camera picture.
Gimbal works and level camera all the time.
DCIM and MISC folders created by drone on empty SD card.
USB cable connection to PC - nothing.
DJI GO shows no SD card inserted.
Green light on gimbal.
Signs of liquid damage on drone mainboard heatsink above camera (only few drops).
No visible liquid damage on mainboard pcb.

Is there a way how to analyze further - like serial port connection
on Phantom 4 mainboard ?
 
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