This probably won't solve your problem, but it's a place to start:
If the switch mechanism under the menu button is gummed up (maybe from spilled soda or something) or broken, then the circuit that says "turn on the menu" may be stuck even if the button may not seem to be stuck.
If the hardware controls are on their own board, you could try removing any connectors that go to it and see if that helps.
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OSD Lock & Unlock When pressing the AUTO button after locking the OSD When pressing the MENU button after locking the OSD This is the function that locks the OSD in order to keep the current states of settings or prevent others from adjusting the current settings. Lock : Hold down the MENU button for more than five (5) seconds to activate the OSD adjustment lock function. Unlock : Hold down the MENU button for more than five (5) seconds to deactivate the OSD adjustment lock function.
Under the menu options, there's Menu Lock. Switch it to "On". It worked
My menu button wasn't working, so to access the menu, I had to hold down
the arrow up button and push the arrow down button till I got to the
Menu Lock Option.
OSD Lock Function: To lock the OSD, press and hold the
Left button while the monitor is off and then press power
button to turn the monitor on. To un-lock the OSD - press
and hold the Left button while the monitor is off and then
press power button to turn the monitor on.