Hi and welcome to the site, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.
Initially, have you tried unplugging for an extended period of time?
The idea is to dissipate residual power inside simulating a soft reset.
The alternative and/or if not corrective is an internal check of the circuitry.
Please post back results / observations of the above once tried.
Unfortunately, the above results would only confirm the internal hardware issue.
Are you then considering a DIY (do-it-yourself) repair approach? If yes, do you have access to and familiar with a multi-meter and even a soldering iron?
Great! Good to hear that you gfound a repair shop.
Glad that the above information served your purpose and if you haven’t done so, please provide a positive rating at the top of your page.
Good luck and thank you too for the opportunity to share the information.