What or behavior is happening on screen?
Before you open the unit or flash new firmware, take a photo of your current "About Machine" screen (Settings > System > About). Write down the MCU version (e.g., MTCE_GS_V3.0) and System version . If you brick the device, you will need these codes to order the correct preloader files from a specialist on XDA. android yt9216bj-00012-v001 manual
Warning: Changing parameters in the Factory menu blindly can invert your touchscreen orientation, break touch tracking, or alter internal audio IC voltages, cutting off speaker sound. Troubleshooting Common Head Unit Errors What or behavior is happening on screen
Ground. Connect to a clean, unpainted chassis ground metal or the factory ground harness. 2. Functional Control Wires break touch tracking