I run professional repair service center for Roomba, today two Roomba's 570 have stopped working after cleaning in ultrasonic cleaner, that I have used for few hundreds times before and always everything has been fine...
Motherboards show no physical signs of damage, but they don't "boot", no di di di melody, or led's shining either... I have checked the pins that supply the voltage from charger cord to the mobo and the voltage was approx. 22.2V, seems fine, so looks like the current gets correctly to the mobo, but the mobo is not running.
The temperature of liquid when in bath was correct ( between 63-70 Celsius deg. in both situations )
Which element could get damaged ?
Big help request