Today i went to the Airport for a short flight with my RV7a. As i powered up the AF-3500S the Startscreen (a Picture of Robs Panel in Flight) comes, but then nothing happend. Normaly the Picture changes and you can see the Bootsequenz.

I wait for more than 1/2 hour but nothing. Then i pull the Breaker several times - but nothing, still the Startscreen (the EFIS is on the internat Backupbattery).

It took one more hour until the internal Backupbattery goes emty an the Sreen goes dark. I tried a new start several Times ( with and without SD-Card) but always the same.

I have the newest Software installed since more than a Year without any Problems. Last Flight was one week ago - no Problems.

What can i do now?

Markus