BATC Forum

Whilst everything worked well at the RSGB COnvention BATC stand, I noticed my Ryde after a few hours was showing a 'thermometer' on the display (never seen before...) and the displayed picture was looking 'noisy' - like the colours were off with horizontal lines - a bit like FM noise but the lines went all across the screen. Back home today, the Ryde works fine but NO HDMI output.
Its been built quiet a while - pretty much as soon as the Ryde was launched and has been my Thursday net RX solution ever since, often running all day. Never seen the 'thermometer' on-screen before either. Although no heatsinks are fitted, there is a small fan that draws air in from the rear of the box, across the PI4 pcb and then exits upwards from the lid. Supply voltage is a SMPS set to 5.25 Volts.
I have tried 4 different monitors - all display nothing (but don't go to sleep saying 'no signal' so I suspect a dying/now dead HDMI output. Can I configure it to use the 2nd output (not being a RPI expert) or do I need a new RPi4.
Having 'killed' the HDMI output by 'hot-plugging' in the past, I now take great care to switch stuff off before changing the HDMI cable around.

Any pointers anyone??

Thanks
Gareth

Hi Gareth,
The thermometer symbol is a built in raspberry pi thing saying it is over heating (the CPU internal temperature is at least 80°C). The difference between the net and the convention is likely due to the signal that you are receiving and how long for, receiving a signal uses more CPU than no signal and more is used with higher bitrates.
The second HDMI should work automatically if connected (and the 1st HDMI isn't connected), although there are some performance penalties to doing it, so its only recommended for situations such as these where the 1st port is broken.
Tim

Thanks Tim, that's brought it back to life (although the beacon is 'broken' again today...)
I've added heatsinks to the two larger chips although I'm sure I have had the beacon running all day at home in the past and never seen the thermometer before.
*** EDIT ***
Thinking about it, I'd misplaced the Plug-top PSU that came with the monitor I was using, so reached for a spare one (only rated at 1A and borrowed from a router that wasn't needed) and after a while it switched off, then on again, repeatedly....I assume slightly too much current draw. I wonder if that stressed the #1 HDMI port or contributed to its demise.
Even more puzzling is WHERE the monitor PSU went, it definitely made it into the venu as it was wrapped round the monitor. But unpacking back home has not revealed where it went.....
Gareth