GRT Avionics

I have an RV-10 panel with an HXr and (2) HX displays. After a period of 3+ weeks of non-use, the 2 HX displays start-up with flickering screen images. The longer the period of non-use, the worse the flickering.

I have not tracked the timings precisely but after 4+ weeks of non-use, one screen was totally un-readable while the other screen was flickering but readable. However, over the next hour or two of being powered up, the screens slowly stop flickering and ultimately appear normal.

Recently after 2 weeks of non-use I noted flickering in both displays but both were readable and both cleared up within the first hour of use.

The 3 displays are all powered directly from a bus and separately from an Intelligent Power Supply (IPS). During startup, the bus is linked to (2) 12 volt batteries so I don’t think power is an issue.

The good news is that the plane can be flown solely with the HXr but I like to have an HX dedicated to the engine and fuel readouts. The other thing is that I am confident the flickering will disappear after 30-60 minutes of operation.

Any insight or service suggestions are welcomed here. Thanks!

If the graphics are scrolling, fuzzy, smeared, or intermittent, and the backlight is stable, then it's usually a video signal issue. The signal can get better as it warms up, or with some jostling. For 2nd generation HX and newer models we can usually fix that. We don't have a supply of parts for first generation HX models so for those you can mostly just make sure the video connections are solid. If you're talking about the LCD backlight flickering then we may be able to help a 2nd gen or later model but it depends on the cause.

Jeff: Just for planning, what serial number begins the 2nd generation HX?

Around serial number 481. You can tell the generation by the screw patterns on the back. The 2nd generation and later has 4 more screws, with 2 screws on the back near the top, and a screw through the GRT logo in the product data plate.