Hello, the same with me. On Wednesday I wanted to start our T112. There was only a white LCD but no screen output visible. After some searching on the forum I came across these posts among others which helped me get my T112 up and running again, thanks for the help. I would of course like to share my approach to success. There is a “Fujitsu SBC – 004-111 – AE8214” installed in my T112. (You can use this to find out which SBC is installed in yours. https://community.allen-heath.com/wp-content/uploads/2021/05/Ilive-CARTES-SBC.pdf)
I proceeded as follows:
1. connection and test of the T112 with external screen (-> no signal)
2. remove the back panel of the T112
3. exchange the battery of the AE8214
4. after replacing the battery the behavior of the T112 did not change (-> no signal on the external screen, no beep when starting the T112)
5. push button connected to the front panel connector of the SBC and SBC started via push button
6. SBC starts with beep and external screen shows boot menu.
7. shortly after startup double beep and error message “System battery is dead – Replace and run Setup”.
8. plug in external keyboard
9. confirm the error with “F1”
10. shortly after an error message appears that no system for booting was found on the hard disk.
11. reboot the SBC, press “F2” during the reboot to enter the BIOS
12. configure bios settings according to instructions (My only for AE8214) (https://community.allen-heath.com/wp-content/uploads/2021/07/AE8214-Fujitsu.pdf) steps 7 -25.
13. T112 restarts as if nothing ever happened.
Good luck
