Wall Control Panel - Precision Circuits

[ferimonter]

2019 HR 38N
I used the rv a month ago and everything worked fine. I turned the power on the other day and the wall control would not light up. I tried starting the coach, turning on the generator and turn all power off and on. Still the wall control would not come on. However, I could still do all the functions using my phone app. The only thing I couldn't do on the phone is control the A/C, but it never did that.
Any suggestions on how to fix this.
Thanks

[ferimonter]

Problem solved. There is a battery behind the wall control panel that went dead. New battery solved it .

[NXR]

Thanks for the update. Is the battery part of the touchscreen itself?

Ray