I have a 2017 Vanguard NXT. The wireless remote control for it has had some water intrusion or something for some time (the LCD has some discoloration that shifts around over time). But it was working fine, function-wise.
Well, today it stopped working. It's now stuck in a continuous "display test" mode where it shows all red pixels for one second, then all green, then all blue, then all white, then a checkerboard pattern, then a finer-grained checkerboard pattern, then black... repeating over and over again (I might have the order slightly wrong).
Holding a finger press on the screen, to try to reboot it, does nothing at all. Doesn't matter how long I hold it, nor what part of the screen. Taking the battery off, then reinstalling, results in it *immediately* starting the same cycle (no boot-up text displayed or anything).
I've googled the hell out of this problem. I can't find anyone describing the same thing. Anybody seen this before? Or have any ideas for further/harder resets? Or am I just stuck buying a $600 replacement remote at this point? Does anyone know how to non-destructively disassemble it? I could at least see if I can dry it out, if that's the problem. I'm wondering if a diagnostic testing pin got shorted to ground or something, given how quickly it starts into the color cycle upon powering up.