Brand new Switch V2 - Blue Screen after Thermal Paste Removal

Hi people,

I just got a brand new Switch V2 and wanted to install a modchip. I disassembled it and gently removed the thermal paste from all parts (including APU) with 100% alcohol.

Before installing the modchip I wanted to test the functionality again and unfortunately I had to realize that only a blue screen is displayed. Under the microscope, I can't see any damage caused by the cleaning.

Could you help me with this?