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GE Vivid E9 ultrasound image has interference troubleshooting 

Failure phenomenons:
GE Vivid E9 ultrasound equipment, there is no obvious interference or problem images when examining patients, but occasionally the images will feel like snowflakes drifting, and there will be small areas of snowflake interference when using the keyboard.

Fault analysis:
First check the keyboard USB input voltage, measure the voltage is normal, there is no obvious voltage change, and the shell is not charged. Test DCDC output voltage is normal. When I checked again, I found that the keyboard popped up not smoothly and smoothly.

Raise the operating platform and find that the ground wire under the keyboard is stuck in the slideway, and it is found that the bare metal wire of the ground wire touches the metal object, causing interference. This grounding is a protective grounding, which is different from the general grounding. The protective grounding is a leakage protection grounding to prevent the damage of the surface of electrical components, and it has a certain protective effect.

When the cable was reconnected to the grounding slot, the failure did not occur again.
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