NO GPS reception?
This morning I when for a short drive only to be confronted with no GPS Speedo in my FE and no GPS signal on Odyssey Navigator. There are two different GPS receivers in the Vehicle, one in the front which has a selectable 1Hz, 5Hz or 10Hz update speed and drives the FE Speed indicator. The second is in the rear and drives the Navigator APP. Both showed absolutely no GPS signal.
I have a standalone GPS but it was in my Wife's car when this happened and would not be available for a few hours. I had removed the CAR-PC the day before to test a few SW update on the bench and my first thought was some crazy interference and perhaps I had left an earth off or something equally silly, anyway I switched to the DAB-FM radio and had perfect reception so I ruled out interference.
Connected one GPS RX to a 20ft extension and placed it far from the vehicle and I suddenly had a few satellites. Move back to the vehicle and they disappeared.
I decided to wait a few hours until I had the Standalone GPS in my hands and that's when it got really ridiculous. Full strength on the Portable Garmin GPS in the open, moved it into the Vehicle (PC OFF) and placed it on the DASH, still full signal. PC was turned on and the M4 PSU started, still full signal, started loading windows, still ok. Desktop came up and the signal went to 0 - absolutely nothing.
I'm sure it was working the previous evening, racked what little brain I have left and vaguely remembered that I had changed the Display refresh rate from 60HZ to 70Hz earlier on in the day. Switched it back thinking I was grasping at straws, as soon as I hit the accept button I had full GPS signal back! WTF!
By this time it was getting dark, tomorrow I'll see if it's the HDMI cable / signal, the Screen (doubt it) or the HDMI to VGA convertor in the front of the vehicle (likely suspect). Makes you wonder how we ever get GPS to work in the first place, keeping in mind it's been working for around two years without a problem once the M4 was modified and a crappy camera with a tiny SMPs was removed. Both had initially killed GPS and DAB-FM reception. Amazing how DAB was unaffected this time, must be an interference harmonic right in the GPS band.