LG-D855 G3 Water Damage.

Testing of the card with a microscope shows no damage to components and no corrosion.

I disassembled the metal shields covering the components.

I cleaned the card several times by hand and in an Ultrasonic Cleaner.

Connection of the card (without cameras, without the screen and touch) to a Power Supply shows consumption of 40mA constant current.

When I press the power button power consumption reaches - 250mA then falls back to - 40mA.

Please advise what is wrong with the card?