> On 5 Nov, 2018, at 7:06 pm, [email protected] wrote:
> 
> I don’t have another Mac available, although I could get another Apple 
> display from eBay and try that.

If you have a VGA monitor or something with a composite-video input, it should 
be possible to jury-rig something with wires to see whether the right signals 
are coming through.

Even a multimeter should help, on in the AC voltage or frequency settings.

 - Jonathan Morton

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