Repairing LCD discoloration on Dynon glass cockpits in a Mooney M20 aircraft is not a field-repairable task and requires the replacement of the display unit. The LCD panel is a sealed, integrated component of the Dynon display unit. Any discoloration, such as yellowing, browning, or blotchy spots, indicates a failure of the internal LCD components, which cannot be fixed by a mechanic in the field.
The Cause of LCD Discoloration
The liquid crystal display (LCD) is a complex assembly of multiple layers, including a liquid crystal layer, polarizing filters, and a backlight. Over time, and with prolonged exposure to heat and ultraviolet (UV) light, these layers can degrade. The most common cause of LCD discoloration is the breakdown of the polarizing filters or the adhesives that hold the layers together. This is an irreversible process. While a screen protector can help, it will not prevent degradation over time. Because the Mooney M20 is a high-performance aircraft that can fly at high altitudes, the displays are exposed to more intense UV radiation, which can accelerate this degradation.
The Professional Repair Process
The principle of authority dictates that the only approved and reliable method for addressing LCD discoloration is to have a certified avionics shop handle the replacement. The repair process is as follows:
- Diagnosis and Confirmation: The first step is to confirm that the discoloration is a permanent issue with the LCD panel and not a temporary software glitch or a backlight problem. The technician will run a display self-test to verify the functionality of the display and its backlight.
- Removal of the Display Unit: The technician will carefully remove the Dynon display unit from the aircraft’s panel. The process involves disconnecting the various wiring harnesses and mounting hardware.
- Replacement with a New or Remanufactured Unit: The faulty display is typically sent to an authorized Dynon repair facility for service or is replaced with a new or factory-remanufactured unit. Dynon offers flat-rate repair or replacement options, and a technician can help you determine the most cost-effective path.
- Configuration and Calibration: Once the new unit is installed, the technician will use specialized software to configure it with the aircraft’s specific settings, including engine parameters and sensor calibrations. A final operational check and logbook entry will be made to ensure the aircraft is returned to an airworthy condition.
The Aero Center’s Commitment
At The Aero Center, we understand the frustration of a faulty display. Serving California, Arizona, and Nevada, our certified technicians have extensive experience with Dynon systems. We are the only 24/7 maintenance center in the area, a commitment that allows us to begin the replacement process as soon as your aircraft arrives. This round-the-clock service minimizes your downtime and gets you back in the air safely and efficiently.
Footnotes
- Dynon Avionics, “SkyView System Installation Guide,” Dynon Avionics, 2024. https://www.dynonavionics.com/includes/guides/SkyView_System_Installation_Guide-Rev_R.pdf
- Mooney International, “M20 Series Maintenance Manual,” Mooney International, 2024.
- AOPA, “Avionics Upgrades and Maintenance,” Aircraft Owners and Pilots Association, 2024. https://www.aopa.org/go-fly/aircraft-and-ownership/avionics
The Aero Center is located at William J. Fox Airfield KWJF | Lancaster, CA. Contact us at 209.885.6950 for questions or appointments.