I purchased a V1 last week and hard wired it the same day. It worked great until today. When I plugged it in today, it powered up fine. It went through it's routine of tests (loud beep, softer beep, etc.), but then the display shut off. I disconnected it and tried again. Same thing. I started driving and left it in that state (a blank display) and behold, the detector is on, but the display was not working. When I passed by the super market, I got the usual multiple bogey alerts from the doors, but NO lights at all!?
I then hooked up the detector to the cigarette lighter adaptor and it worked perfect (display came on and stayed on). I ripped the hardwire out and started again thinking it was just a poor ground. I ruled this out because I was grounding it to bare sheet metal (I scraped the paint away to make sure it was a good connection). I then checked the 12V+ with a multi-meter and is was reading 12.22V, which is just fine. I tried two different phone connectors (both the straight and curled one that came with it) and the same blank display appeared. The only thing I can think of is the direct-wire power adaptor is bad. Anyone else seen this before? Anyone else have any other ideas? Thanks for the insight!