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What This Guide Helps With
Troubleshooting no display, black screen, failed startup, battery depletion, cable issues, or connection-related no-image complaints.
Step-by-Step Troubleshooting
Ensure Patient Safety First
Confirm the video laryngoscope is not being relied on for an active airway procedure before troubleshooting.
If the device fails during use, clinical staff should immediately switch to a backup airway device according to facility airway protocol.
Expected outcome: The patient is not dependent on a video laryngoscope with no image or no display.
Verify the Reported Failure
Ask clinical staff what was observed:
- Pocket monitor would not power on
- Display stayed black
- Power indicator appeared briefly then shut off
- Video laryngoscope was connected but no image appeared
- Failure occurred after cleaning, charging, storage, or cable connection
Expected outcome: The failure mode is confirmed before parts are swapped or the device is removed from service.
Check for Obvious Physical Damage
Inspect the pocket monitor housing, display, connector port, cable connection area, and buttons.
Look for cracks, impact damage, liquid intrusion, bent pins, corrosion, loose connectors, or damaged strain relief.
Expected outcome: No visible damage is present before continuing.
If damage, fluid intrusion, burning smell, or connector deformation is found, remove the device from service and stop troubleshooting.
Confirm the Unit Is Actually Powered On
Press the power button using a normal, deliberate press. Observe the screen and any indicator behavior.
Do not repeatedly press the button rapidly, as this may make startup behavior harder to interpret.
Expected outcome: The monitor powers on and displays a startup screen or live image.
If the monitor powers on, verify normal operation and return to service if no other issue is found.
Check Battery Charge Status
Connect the pocket monitor to the approved charging method or charging cable used by the department.
Allow the device to sit on charge long enough to confirm whether charge indication appears.
Expected outcome: The monitor shows charging behavior or powers on after charging.
If the monitor was simply discharged and powers on after charging, document the battery condition and return the device to service after functional verification.
Verify the Charging Source
Check that the charger, charging cable, charging dock, or power supply is connected to a known-good outlet.
Test the outlet with another device or approved outlet tester if appropriate.
Expected outcome: The charging source is confirmed functional.
If the outlet or charger is faulty, correct the power issue, recharge the monitor, verify operation, and stop.
Swap Known-Good External Charging Accessories
If available, try a known-good charger, charging cable, or docking station compatible with the C-MAC Pocket Monitor.
Avoid forcing any connector into the device.
Expected outcome: The monitor charges or powers on using known-good accessories.
If the problem follows the charger or cable, remove the failed accessory from service and return the monitor after verification.
Inspect and Reseat the Video Connection
If the monitor powers on but shows no image, disconnect and reconnect the compatible C-MAC video laryngoscope cable or scope connection.
Check for incomplete seating, bent contacts, contamination, or loose fit.
Expected outcome: The monitor recognizes the connected scope and displays an image.
If reseating restores the image, verify stable video while gently moving the cable at the external connection only. If stable, document and return to service.
Check with a Known-Good Compatible Scope or Cable
Connect the pocket monitor to a known-good compatible C-MAC video laryngoscope or cable, if available.
This helps separate a monitor issue from a scope, cable, or connector issue.
Expected outcome: The pocket monitor displays video with a known-good connected device.
If the known-good scope works, remove the suspect scope or cable from service for evaluation.
Check the Suspect Scope or Cable on a Known-Good Monitor
If another compatible C-MAC monitor is available, test the suspect scope or cable on that monitor.
Expected outcome: The issue follows either the pocket monitor or the connected accessory.
If the scope or cable fails on another monitor, the accessory is the likely problem.
If the scope works on another monitor but not on the pocket monitor, the pocket monitor likely requires repair.
Observe for Intermittent Operation
If the display powers on or video appears intermittently, gently check external connector stability without pulling, twisting, or stressing the cable.
Watch for image dropouts, flickering, shutdown, or loss of recognition.
Expected outcome: The image remains stable during normal handling.
If video cuts in and out, remove the affected component from service. Intermittent video is not acceptable for airway use.
Perform Final Functional Verification
Once the issue is resolved, confirm:
- Monitor powers on normally
- Battery or charging indication is acceptable
- Compatible scope is recognized
- Live image displays clearly
- Image remains stable at the external connection
- No physical damage is present
Expected outcome: The C-MAC Pocket Monitor is safe to return to service.
If the Problem Persists
If the C-MAC Pocket Monitor still has no display or no image after external power, charging, cable, scope, and connector checks, common external causes have been ruled out.
The issue is likely internal to the monitor, battery system, display, power circuit, or input connection.
The device should be removed from service, labeled Out of Service, and sent for repair or bench evaluation.
Knowing when to stop is proper troubleshooting. A video laryngoscope with unreliable power or image display should not remain available for airway use.
Clinical Use Tip
Do not troubleshoot a failed video laryngoscope on an active patient. Airway devices require immediate backup readiness. Move clinical staff to a working laryngoscope first, then evaluate the failed unit only when patient care is protected.
Work Order Documentation (CCR Method)
CCR = Complaint, Cause, Resolution
Complaint
What was reported by the clinical staff.
Example:
"Clinical staff reported the Karl Storz C-MAC Pocket Monitor would not power on and no airway image was displayed."
Cause
What was observed during troubleshooting.
Example:
"Found the pocket monitor battery fully discharged after verifying the outlet and charging accessories were functional."
Resolution
What action was taken.
Example:
"Charged the pocket monitor, confirmed startup, verified live image with a compatible C-MAC scope, and returned the device to service."
Helpful Details to Include (If Known)
- Whether the unit was in active use or found during setup
- Whether the display was completely black or briefly illuminated
- Battery or charging indicator behavior
- Outlet tested
- Charger or charging cable swapped
- Scope or video cable swapped
- Connector condition
- Alarm behavior, including any startup shutdown or recognition messages
- Accessories swapped, including charger, cable, docking station, scope, or video cable
- Power behavior, including no power, brief illumination, charging indication, or shutdown
- Environmental factors, including cleaning, storage, liquid exposure, impact, unusual heat, smell, or contamination
- Indicator lights or charging indicators observed
- Any flickering, intermittent image loss, or startup shutdown
- Any visible damage, fluid exposure, unusual heat, smell, or impact marks
- Final device status
Final Thought
Troubleshooting a C-MAC Pocket Monitor with no image or no display should start with patient safety, then move through simple external checks: power, charging, accessories, connections, and compatible scopes. If the issue cannot be isolated externally, remove the device from service and escalate it for repair. Clear CCR documentation helps show what was tested and why the final decision was appropriate.
That is successful troubleshooting.