G500 GDU 620 rainbow screen - possible solutions?

My G500 has suddenly developed a rainbow screen https://marysun.com.au/assets/Garmin%20G500.JPG . The issue was intermittant last week, but now seems permanent.

There is a GDU voltage alert "GDU has low voltage" but not sure if this is because all other sysytems were switched off when I tested.

Many thanks for any constructive solutions or advice.

0 Garmin-AW 4 months ago

Hi there, after working with the field service team on your issue, it doesn't look like this will be something we can resolve here on the pilot side. We recommend taking this to your local Garmin dealer so that they can get you a resolution. You can find certified dealers local to you here, ensure to select Aviation as the category: How to Find a Garmin Dealer