Guys, this is a problem in low-quality components of the LED display and the control chip on the front panel of the receiver - I solved this problem with the replacement of the ET6226M chip, but the bleating resumed for a long time. The receiver, after switching on, lived its own life, channels spontaneously turned on, I can go to the recovery menu myself - although even the batteries were removed from the remote control. .IT IS NECESSARY TO CHANGE BOTH THE CHIP AND THE LED DISPLAY IN PAIRS TO OBVIOUSLY NEW OR SERVICEABLE ONES .
If you do not have these spare parts, a quick quick exit to restore the receiver's operation - in general, what I have done so far is to raise the 10pin U1 Vcc power supply-the display, LED and power button on the front panel of the receiver do not work... BUT the receiver ITSELF is controlled from the remote control and is fully functional.
there is no exact circuit for this receiver, I did not find a typical circuit, that's what I did.
https://archive.espec.ws/files/ET6226.pdf