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My measurement here is indeed about 80 mA without the backlight, and 87 mA when the display backlight is on.?

When?testing QMXs I did once see one which had an anomalous current consumption 10mA higher than I would expect. I traced this to a shorted GPIO pin (I forget which) due to a solder whisker; I think it was across the transmit/receive switch transistor gate if I recall?correctly (C508); so the processor was driving that output high into ground and maxing out at a certain number of mA, which by the time it was reduced (due to the buck converter) appeared as a 10mA increment on the 12V rail. Of course?I would have got as far as testing the receiver and it would fail at that point, because the signal never gets through the Tx/Rx switch. But I detected the problem ahead of that, just on the basis of the increased current consumption.?

I see very little variation between units so a 10mA increase is notable.?

So one of:

1) You could have a short somewhere?

2) Your current consumption measurement is inaccurate

3) MY current consumption measurement is inaccurate

4) Both 2) and 3)?