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What This Guide Helps With
Troubleshooting a frozen, blank, inaccurate, intermittently responsive, or completely unresponsive GUI caused by contamination, software state, power, connections, or display failure.
Step-by-Step Troubleshooting
1. Ensure Patient Safety First
Do not troubleshoot an unresponsive touchscreen or GUI while the Puritan Bennett 980 is actively supporting a patient.
- Notify respiratory therapy and the clinical team that ventilator controls may be unavailable or unreliable.
- Transfer the patient to another verified ventilator using the facility’s approved procedure.
- Provide an approved alternative ventilation method when clinically required.
- Confirm effective ventilation and alarm operation on the replacement device.
Expected outcome: The patient is safely supported without relying on a ventilator whose settings cannot be reliably viewed or changed.
Continue Clinical Engineering troubleshooting only after the affected PB980 has been removed from patient use.
2. Confirm the Exact GUI Failure
Determine whether the problem involves:
- A completely blank display
- A frozen screen with information still visible
- Touch input failing across the entire screen
- Only one area of the screen not responding
- Delayed or intermittent touch response
- Incorrect touch location or unintended selections
- A display that restarts repeatedly
- A display problem occurring only during startup
Observe the separate status display on the breath delivery unit for power, ventilation, alarm, or fault information. The PB980 includes this additional display as a redundant indication of ventilator operation.
Expected outcome: The failure is clearly identified as a display, touchscreen-input, startup, or complete ventilator problem.
3. Check for Screen Contamination or Physical Interference
Inspect the touchscreen for:
- Moisture
- Cleaning residue
- Medication or adhesive residue
- Heavy fingerprints or oils
- Protective film lifting from the surface
- Labels or tape contacting the active display area
- Cracks, impact damage, or pressure marks
Power the ventilator off before cleaning. Clean the screen only with products and methods approved by the manufacturer and facility policy. Do not spray liquid directly onto the GUI.
Allow the screen to dry fully before testing.
Expected outcome: The display surface is clean, dry, unobstructed, and free from visible damage.
If normal touch operation returns, complete an operational verification and stop troubleshooting.
4. Verify That the GUI Is Not Locked or Awaiting Confirmation
Review the displayed screen for:
- A control-lock condition
- A confirmation prompt
- A modal message covering normal controls
- A startup or pre-use screen requiring an approved response
- A menu or window that must be closed before other controls respond
Attempt to operate several different on-screen controls rather than repeatedly pressing one location.
Expected outcome: A screen lock, open prompt, or software-navigation condition is either identified and cleared or ruled out.
If the GUI responds normally afterward, verify all critical controls and stop troubleshooting.
5. Check External Power and Power Indicators
Verify:
- The AC power cord is fully seated at the ventilator and approved outlet.
- The outlet supplies the correct voltage.
- The cord and plug have no cuts, bent contacts, heat damage, or looseness.
- The ventilator’s power and status indicators behave normally.
- The breath delivery unit status display remains active.
Test the outlet with an approved electrical tester or known-good device when permitted.
A blank GUI accompanied by loss of all ventilator indicators suggests a broader power problem rather than an isolated touchscreen failure.
Expected outcome: Stable external power is confirmed, and the issue is isolated to the GUI or touchscreen when other ventilator indicators remain operational.
6. Inspect the GUI Assembly and External Connections
With the ventilator powered off and disconnected from the patient:
- Confirm the GUI is securely mounted.
- Inspect accessible GUI cables and connectors for looseness, strain, pinching, cuts, or impact damage.
- Check that cables have not been pulled during transport or caught on the cart.
- Look for liquid intrusion, damaged connector housings, or bent mounting components.
- Do not disconnect or reseat internal connectors unless authorized by the service procedure and performed by qualified personnel.
Expected outcome: The GUI mounting and externally accessible connections are secure and undamaged.
If a loose external connection is found and can be safely corrected without internal disassembly, secure it and retest the ventilator.
7. Perform a Controlled Restart
Only after the ventilator has been removed from patient service:
- Turn the ventilator off using the normal shutdown process when the GUI permits.
- Disconnect AC power.
- Allow the ventilator to shut down completely.
- Reconnect it to a verified AC outlet.
- Start the ventilator and observe the GUI throughout the complete startup sequence.
Do not repeatedly cycle power if the GUI continues freezing or restarting. Repeated restarts can obscure an intermittent fault without correcting its cause.
Expected outcome: The GUI completes startup, displays information correctly, and responds consistently to touch.
If the restart restores operation, continue with functional verification before returning the ventilator to service.
8. Check for Startup Errors, Alarms, or Diagnostic Information
Record all displayed or status-screen information, including:
- Diagnostic codes
- Technical alarms
- POST or startup failures
- Repeated reboot behavior
- Communication-related messages
- Loss-of-GUI indications
- Software version, when accessible
- Time and circumstances of the failure
Photograph or transcribe the information according to facility policy before restarting the ventilator again.
Expected outcome: Available fault information is preserved for repair evaluation and vendor support.
9. Test the Entire Touchscreen
When the GUI is responsive, test controls across multiple areas of the screen:
- Upper and lower portions
- Left and right sides
- Center area
- Menu selections
- Setting adjustments
- Confirmation controls
- Alarm-related screens
Watch for:
- Dead zones
- Delayed response
- Incorrect selections
- Double activation
- Intermittent freezing
- Touch response without corresponding visual feedback
Do not rely on a touchscreen that works only in certain areas.
Expected outcome: The full active touchscreen area responds accurately and consistently.
If any dead zone or inaccurate response remains, remove the ventilator from service.
10. Remove External Accessories That May Affect Operation
Disconnect nonessential external accessories one at a time while the ventilator is powered off, such as:
- USB devices
- External communication cables
- Data-interface accessories
- Network connections
- Nonessential peripheral equipment
Restart and retest after removing questionable accessories.
Do not disconnect required gas or breathing-system components during a formal performance test.
Expected outcome: An external accessory or communication connection is either identified as the cause or ruled out.
If the GUI operates normally after an accessory is removed, inspect or replace that accessory and document the finding.
11. Complete an Operational Verification
Before returning the PB980 to clinical use:
- Confirm the GUI remains responsive after extended operation.
- Verify all touchscreen regions.
- Confirm displayed settings match selected values.
- Verify alarm indicators and audible alarms.
- Complete the manufacturer-required pre-use or short self-test procedures.
- Test the ventilator with an appropriate test lung.
- Confirm the breath delivery unit status display agrees with normal ventilator operation.
- Verify there are no unresolved technical alarms.
The manufacturer provides the PB980 operator’s manual and supporting reference materials as the primary instructions for operation and verification.
Expected outcome: The ventilator completes required testing with a stable, accurate, and fully responsive GUI.
If the issue was resolved but cannot be confidently duplicated or verified, keep the ventilator out of service for further observation or bench evaluation.
If the Problem Persists
If the GUI remains blank, frozen, inaccurate, intermittently responsive, or unable to complete startup after external causes have been ruled out, the problem is likely internal.
Possible internal causes may involve the touchscreen assembly, GUI electronics, power distribution, communication path, software, processor, or breath delivery unit interface. Internal diagnosis should follow the current manufacturer service documentation and facility authorization requirements.
The ventilator should be:
- Removed from service
- Labeled Out of Service
- Sent for qualified repair or bench evaluation
- Escalated to Medtronic technical support when required
- Subjected to complete performance verification after repair
Do not return the ventilator to clinical use solely because the touchscreen begins responding temporarily. Knowing when to stop and escalate is proper troubleshooting.
Clinical Use Tip
Never troubleshoot an unreliable GUI while the PB980 is connected to an active patient. Move the patient to another verified ventilator before restarting, cleaning, disconnecting accessories, or evaluating controls.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Respiratory therapy reported that the Puritan Bennett 980 GUI displayed ventilation information but did not respond to touchscreen selections."
Cause
What was observed during troubleshooting.
Example:
"Touchscreen remained unresponsive after cleaning, verifying AC power, inspecting accessible GUI connections, removing external accessories, and performing a controlled restart."
Resolution
What action was taken.
Example:
"Ventilator was removed from service, labeled Out of Service, and routed for bench evaluation of the GUI and communication hardware."
Helpful Details to Include (If Known)
- Patient transferred before troubleshooting
- Exact GUI symptom documented
- Entire screen or isolated area affected
- Outlet tested
- AC cord inspected
- BDU status-display behavior
- Screen cleaned and dried
- GUI mounting and cables inspected
- External accessories removed
- Startup or diagnostic codes recorded
- Power cycle performed
- Touchscreen dead zones identified
- Alarm behavior verified
- Unusual heat, smell, or sounds
- Pre-use testing completed
- Final device status documented
Final Thought
A PB980 with unreliable controls presents a serious patient-safety risk even when ventilation appears to continue. External-first troubleshooting, controlled testing, timely escalation, and complete CCR documentation protect both patients and the repair process.
That is successful troubleshooting.