GE Vivid S6: keyboard buttons and encoders triggering on their own
What happened
On a GE Vivid S6 ultrasound, keys and rotary encoders on the control panel actuated without anyone touching them.
What was checked
- Visual inspection of the boards for spills and contamination — both boards looked clean, as reported in the case.
- Ribbon cables were re-seated — the phantom activations did not go away.
- The system was run without the control panel to rule out interference from the rest of the electronics.
- The encoder board was disconnected — with it out of the circuit the phantom presses stopped, which isolated the fault to that board.
Cause
Since the encoders are Hall-effect types and all of them misbehaved together, the engineers looked for a common cause rather than worn individual parts. On the keyboard board they found a faulty IC with a suspected solder defect — it was taking out all the encoders at once.
What was done
The faulty IC on the keyboard board was replaced — a component-level repair with soldering work. After the replacement the phantom presses and encoder glitches stopped, and the system was returned to service; the outcome was reported as solved.
Safety
Isolate the unit from mains and let internal supplies discharge before opening the console, keep ESD precautions when soldering on boards, and confirm electrical safety before returning the system to patient use.
Lesson: When several controls on the same board misbehave at once, check what they share — supply, common trace or a support IC — before swapping individual buttons or encoders.
Covered in the course: Ultrasound Service — Level 2: Fault-Finding →
Written from an anonymised case shared by service engineers. It is not a manufacturer instruction and grants no authorisation. Independent note; names are trademarks of their owners.