On my RPi 3 B+ if I plug in HDMI to a monitor I get no display.
If I power cycle With HDMI connected then it shows up on display.
So HDMI works if connected before power-on.

Regards,
Bill

I am using the preconfigured card supplied with the unit.

On Mon, 5 Jul 2021 00:23:19 -0400, Robert DiRosario wrote:

>On the Raspberry Pi TimeHat is there output to the HDMI connector, or is 
>it configured to just use a serial console?
>I'm using the preconfigured SDHC card, so the software should be fine.  
>If I swap out the SDHC card with a different one the systems boots fine, 
>so the hardware works.

>With the card with the software there is never any output to the HDMI 
>connector.

>Based on the LED on the GPS module it's locking up on the GPS signals 
>just fine.  After the initial lockup, it locks up again in only a few 
>seconds after a power cycle.

>Robert
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Bill Beam
NL7F


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