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ST Aviation LCD Screen blank

Posted: Mon Apr 08, 2019 1:54 pm
by David Lewendon

I have an ST Aviation fuel flow monitor in my aircraft.

The LCD screen (DEM16214SYH-LY) has stopped working since I moved the panel where it is located to remove some fod that was there.

The screen glows when I switch the master on but does not show any characters or digits.

Please can someone suggest how I can test the LCD to see if it is working or not.


Re: ST Aviation LCD Screen blank

Posted: Tue Apr 09, 2019 7:53 pm
by mcfadyeanda
Ah yes, that infuriating screen.
I'm not sure how you test them. Mine goes off when it gets anywhere near warm, then on again in winter.
I think in part due to a flakey voltage regulator in the main power supply of the electronics being too weedy (others have replaced these with some success).
There is also a modified circuit (a simple rheostat) that can be applied to vary screen contrast; I think this may have something to do with it too, but haven't tried that out.
Otherwise I was able to source a replacement screen from TME in Poland; at that time it was extremely difficult getting payment across, but they're now on PayPal.
Haven't checked if they still have them.

Duncan McF.